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EK-D590A-EN-B01

July 1993

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Document:	DECsystem 5900 Enclosure Maintenance Manual
Order Number:	EK-D590A-EN
Revision:	B01
Pages:	280
Original Filename:

OCR Text

DECsystem 5900
Enclosure Maintenance Manual
Order Number: EK–D590A–EN. B01

Digital Equipment Corporation
Maynard, Massachusetts

First Printing, July 1992/Revised, June 1993
The information in this document is subject to change without notice and should not be construed
as a commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that may appear in this
document.
Any software described in this document is furnished under a license and may be used or copied
only in accordance with the terms of such license. No responsibility is assumed for the use or
reliability of software or equipment that is not supplied by Digital Equipment Corporation or its
affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions
as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause
at DFARS 252.227–7013.

© Digital Equipment Corporation 1992, 1993.
All Rights Reserved.
Printed in U.S.A.
The following are trademarks of Digital Equipment Corporation: CI, CompacTape, DEC,
DECconnect, DECnet, DECserver, DECsystem 5900, DECsystem 5900/260, DECwindows, RRD40,
RRD50, RX, ThinWire, TK, TS, TU, TURBOchannel, ULTRIX, VAX, VAX DOCUMENT, VMS, VT,
and the Digital logo.
EXABYTE is a trademark of Exabyte Corporation.
Prestoserve is a trademark of Legato Systems, Inc.; the trademark and software are licensed to
Digital Equipment Corporation by Legato Systems, Inc.
All other trademarks and registered trademarks are the property of their respective holders.
FCC NOTICE: This equipment has been tested and found to comply with the limits for a Class
A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference, in which case users will be required to correct the interference at their own expense.
This document is available in hard copy only.

S2105

This document was prepared using VAX DOCUMENT, Version 2.1.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

xvii

1 DECsystem 5900 Enclosure
1.1
DECsystem 5900 System Overview . . . . . . . . . . . . . . . . . .
1.1.1
Enclosure Description . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.1.1
Cooling Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.1.2
Enclosure Power Controller . . . . . . . . . . . . . . . . . .
1.1.1.2.1
Power Distribution . . . . . . . . . . . . . . . . . . . . . .
1.1.1.2.2
Uninterruptible Power Supply . . . . . . . . . . . . .
1.1.1.2.3
Power Sequencing . . . . . . . . . . . . . . . . . . . . . .
1.1.1.3
CPU and Mass Storage Drawers . . . . . . . . . . . . . .
1.1.1.3.1
Drawer Design . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.1.3.2
Electromagnetic Interference (EMI) . . . . . . . . .
1.1.2
CPU Drawer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.2.1
CPU Drawer Front Panel . . . . . . . . . . . . . . . . . . . .
1.1.2.2
CPU Drawer Rear Panel . . . . . . . . . . . . . . . . . . . .
1.1.2.3
CPU Drawer Components . . . . . . . . . . . . . . . . . . .
1.1.2.4
CPU Daughter Card and System Module
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.2.5
Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.2.6
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.2.7
CPU Drawer Options . . . . . . . . . . . . . . . . . . . . . . .
1.1.2.8
TURBOchannel Extender Module . . . . . . . . . . . . .
1.1.3
Mass Storage Drawer Description . . . . . . . . . . . . . . . .
1.1.3.1
Mass Storage Drawer Information . . . . . . . . . . . . .
1.1.3.2
Removable and Nonremovable Media Devices . . . .
1.1.4
Mass Storage Drawer 1 . . . . . . . . . . . . . . . . . . . . . . . .
1.1.4.1
Mass Storage Drawer 1 Front Panel . . . . . . . . . . .
1.1.4.2
Mass Storage Drawer 1 Rear Panel . . . . . . . . . . . .
1.1.4.3
Mass Storage Drawer 1 Interior Compartments . . .
1.1.4.4
Mass Storage Drawer 1 SCSI Signal Buses . . . . . .
1.1.4.5
Mass Storage Drawer 1 Device Brackets . . . . . . . .

1–1
1–2
1–6
1–6
1–7
1–9
1–9
1–9
1–10
1–10
1–11
1–11
1–12
1–12
1–14
1–15
1–16
1–18
1–20
1–21
1–21
1–21
1–22
1–22
1–23
1–23
1–25
1–25

iii

Mass Storage Drawer 1 Power Supply . . . . . . . . . . . . .
Power Supply and Power Harness . . . . . . . . . . . . .
Mass Storage Drawer 1 Power Switch Cable . . . . .
Mass Storage Drawer 2 . . . . . . . . . . . . . . . . . . . . . . . .
Mass Storage Drawer 2 Front Panel . . . . . . . . . . .
Mass Storage Drawer 2 Rear Panel . . . . . . . . . . . .
Mass Storage Drawer 2 Interior Compartments . . .
Mass Storage Drawer 2 SCSI Signal Buses . . . . . .
Mass Storage Drawer 2 Device Brackets . . . . . . . .
Mass Storage Drawer 2 Power Supply . . . . . . . . . . . . .
Power Supply and Power Harness . . . . . . . . . . . . .
Mass Storage Drawer 2 Power Switch Cable and
LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.8
Mass Storage Drawer Options . . . . . . . . . . . . . . . . . . .
1.1.9
Rackmounted Enclosure Options . . . . . . . . . . . . . . . . .
1.1.10
External Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1.11
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
DECsystem 5900 System Processing Capabilities . . . . . . .
1.2.1
System Module Components . . . . . . . . . . . . . . . . . . . .
1.2.2
CPU/Daughter Card Components . . . . . . . . . . . . . . . .
1.2.3
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.4
Prestoserve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.5
TURBOchannel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.6
SCSI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3
DECsystem 5900 Cables and Buses . . . . . . . . . . . . . . . . . .
1.3.1
Drawer Cables and Buses . . . . . . . . . . . . . . . . . . . . . .
1.3.2
System Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4
LED Power Indicators and Switches . . . . . . . . . . . . . . . . .

1.1.5
1.1.5.1
1.1.5.2
1.1.6
1.1.6.1
1.1.6.2
1.1.6.3
1.1.6.4
1.1.6.5
1.1.7
1.1.7.1
1.1.7.2

1–25
1–25
1–25
1–27
1–27
1–28
1–28
1–30
1–30
1–30
1–30
1–30
1–32
1–32
1–33
1–33
1–34
1–34
1–34
1–35
1–35
1–35
1–36
1–37
1–37
1–37
1–38

2 DECsystem 5900 System Installation
2.1
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
2.2
2.2.1
2.2.2

Site Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DECsystem 5900 Physical Dimensions . . . . . . . . . . . .
Additional Equipment . . . . . . . . . . . . . . . . . . . . . . . . .
Static Electricity . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature and Humidity Values . . . . . . . . . . . . . . .
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the Shipment . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Skid . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leveling the System . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–1
2–2
2–2
2–3
2–3
2–3
2–4
2–6
2–6
2–8

Assembling the System Skirts . . . . . . . . . . . . . . . . . . .
Front Skirt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Side Skirts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Skirts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening the Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing Mass Storage Drawer 1 Shipping
Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.6
Removing Mass Storage Drawer 2 Shipping
Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Console and Network Connections, Power-Up . . . . . . . . . .
2.3.1
Connecting the Console Terminal and Ethernet . . . . . .
2.3.2
Connecting the Power/Turning the System On and
Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3.2.1
Turning On the Power Controller . . . . . . . . . . . . . .
2.3.2.2
Turning On the CPU Drawer . . . . . . . . . . . . . . . . .
2.3.2.3
Turning On a Mass Storage Drawer . . . . . . . . . . .
2.4
Completing the Installation . . . . . . . . . . . . . . . . . . . . . . . .
2.4.1
Removing Blank Media . . . . . . . . . . . . . . . . . . . . . . . .
2.4.2
Setting Console Terminal Parameters . . . . . . . . . . . . .
2.4.3
Troubleshooting and Diagnostics . . . . . . . . . . . . . . . . .
2.4.3.1
Error Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.3.2
Running Diagnostics . . . . . . . . . . . . . . . . . . . . . . .
2.4.4
Power-Up Self-Tests . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4.4.1
Problems with Option Modules . . . . . . . . . . . . . . .
2.4.4.2
Resolving Problems . . . . . . . . . . . . . . . . . . . . . . . .
2.5
Accessory Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2.3
2.2.3.1
2.2.3.2
2.2.3.3
2.2.4
2.2.5

2–8
2–8
2–9
2–10
2–12
2–13
2–15
2–16
2–17
2–17
2–18
2–18
2–19
2–22
2–22
2–22
2–22
2–22
2–22
2–22
2–23
2–23
2–23

3 Enclosure and CPU Drawer FRU Removal and
Replacement
3.1
Removing and Replacing Enclosure FRUs . . . . . . . . . . . . .
3.1.1
Opening the Enclosure Doors . . . . . . . . . . . . . . . . . . . .
3.1.2
Enclosure Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3
Removing and Replacing Drawer Filler Panels . . . . . .
3.1.4
Removing and Replacing the Power Controller . . . . . .
3.2
Removing and Replacing CPU Drawer FRUs . . . . . . . . . . .
3.2.1
Accessing the CPU Drawer . . . . . . . . . . . . . . . . . . . . .
3.2.1.1
CPU Drawer Compartments and Covers . . . . . . . .
3.2.1.2
Stabilizing the Enclosure . . . . . . . . . . . . . . . . . . . .
3.2.1.3
Pulling Out/Pushing In the Drawer . . . . . . . . . . . .
3.2.1.4
Opening/Removing the CPU Drawer Front Top
Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1.5
Opening the CPU Drawer Middle Top Cover . . . . .

3–2
3–2
3–4
3–4
3–4
3–6
3–6
3–6
3–8
3–9
3–12
3–14

Opening the CPU Drawer Rear Top Cover . . . . . . .
Removing and Replacing the CPU Blower . . . . . . . . . .
Removing and Replacing the CPU Power Supply . . . . .
Removing and Replacing the Power Distribution
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5
Accessing the CPU Compartment . . . . . . . . . . . . . . . .
3.2.6
Removing and Replacing the CPU/Daughter Card . . . .
3.2.6.1
Removing the CPU/Daughter Card . . . . . . . . . . . .
3.2.6.2
Installing the CPU/Daughter Card . . . . . . . . . . . .
3.2.7
Memory Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.7.1
MS02–CA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.7.2
MS02–NV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.8
Removing and Replacing the TURBOchannel
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.8.1
Illustrations of Typical TURBOchannel
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.9
System Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.9.1
Removing and Replacing the Stiffener for Shipping
the System Module . . . . . . . . . . . . . . . . . . . . . . . .
3.2.9.2
Removing and Replacing the System Module . . . . .
3.2.9.3
CPU Compartment Blank Panels . . . . . . . . . . . . . .
3.2.10
Removing and Replacing the TURBOchannel Extender
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3
Removing and Replacing the Entire CPU Drawer/CPU
Drawer Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1
Balancing the System . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2
Removing the Cable Arm . . . . . . . . . . . . . . . . . . . . . . .
3.3.3
Removing the CPU Drawer Slides . . . . . . . . . . . . . . . .
3.3.3.1
CPU Drawer Location . . . . . . . . . . . . . . . . . . . . . .
3.3.3.2
Slide Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.4
Balancing the System . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.5
Installing the Drawer in the Cabinet . . . . . . . . . . . . . .
3.3.6
Pushing In the Drawer . . . . . . . . . . . . . . . . . . . . . . . .
3.3.7
Connecting the Drawer . . . . . . . . . . . . . . . . . . . . . . . .
3.3.8
Installing a Dual (Second) CPU Drawer . . . . . . . . . . .

3.2.1.6
3.2.2
3.2.3
3.2.4

3–17
3–18
3–20
3–22
3–27
3–27
3–27
3–29
3–30
3–30
3–31
3–32
3–34
3–36
3–37
3–38
3–40
3–41
3–43
3–43
3–47
3–48
3–48
3–48
3–51
3–51
3–53
3–53
3–53

4 Mass Storage FRU Removal and Replacement
Accessing the Enclosure and Mass Storage Drawers . . . . .
Enclosure Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing and Replacing Drawer Filler Panels . . . . . .
Pulling Out/Pushing In a Mass Storage Drawer . . . . . . . .
Removing the Hex Screws . . . . . . . . . . . . . . . . . . . . . .
Sliding the Drawer In and Out . . . . . . . . . . . . . . . . . .
Identifying Mass Storage Drawers 1 and 2 . . . . . . . . . . . .
Mass Storage Drawer 1 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening and Closing the Mass Storage
Compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.2
Removing and Replacing Storage Devices . . . . . . . . . .
4.4.2.1
Mass Storage Device Brackets . . . . . . . . . . . . . . . .
4.4.3
Removing and Replacing Brackets and Devices . . . . . .
4.4.3.1
Removing Drive Bracket and Devices . . . . . . . . . .
4.4.3.2
Removable Media Filler Panels . . . . . . . . . . . . . . .
4.4.3.3
Removing Removable Media Device Bracket and
Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4.3.3.1
Full-Height Devices . . . . . . . . . . . . . . . . . . . . .
4.4.3.3.2
Half-Height Devices . . . . . . . . . . . . . . . . . . . . .
4.4.4
Mass Storage Drawer 1 Configuration . . . . . . . . . . . . .
4.4.5
Removing and Replacing the Mass Storage Drawer 1
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5
Mass Storage Drawer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.1
Opening the Mass Storage Compartment . . . . . . . . . .
4.5.2
Removing and Replacing Storage Devices and
Brackets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.3
Mass Storage Device Brackets . . . . . . . . . . . . . . . . . . .
4.5.4
Removing and Replacing Brackets and Devices . . . . . .
4.5.4.1
Removing a Drive Bracket and Device . . . . . . . . . .
4.5.4.2
Removing a Device from a Drive Bracket . . . . . . . .
4.5.4.3
Removable Media Filler Panels . . . . . . . . . . . . . . .
4.5.4.4
Removing Mass Storage Drawer 2 Removable
Media Device Bracket and Devices . . . . . . . . . . . .
4.5.4.5
Removing Devices from Mass Storage Drawer 2
Removable Media Device Brackets . . . . . . . . . . . . .
4.5.5
Mass Storage Drawer 2 Configuration . . . . . . . . . . . . .
4.5.6
Removing and Replacing the Mass Storage Drawer 2
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5.7
Removing and Replacing the Mass Storage Drawer 2
Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6
Mass Storage Drawer Configuration . . . . . . . . . . . . . . . . .

4.1
4.1.1
4.1.2
4.2
4.2.1
4.2.2
4.3
4.4
4.4.1

4–2
4–2
4–2
4–4
4–4
4–5
4–8
4–8
4–8
4–10
4–10
4–12
4–12
4–15
4–17
4–18
4–19
4–20
4–21
4–23
4–23
4–24
4–24
4–27
4–27
4–28
4–29
4–31
4–33
4–34
4–35
4–36
4–37

vii

4.6.1
Altering the Factory-Set Configuration . . . . . . . . . . . .
4.6.1.1
Single Bus Configuration . . . . . . . . . . . . . . . . . . . .
4.6.1.2
Split Bus Configuration . . . . . . . . . . . . . . . . . . . . .
4.7
Identifying and Replacing a Faulty SCSI Device . . . . . . . .
4.7.1
Procedure for Installing a New SCSI Device . . . . . . . .
4.8
SCSI IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8.1
Default SCSI Device IDs . . . . . . . . . . . . . . . . . . . . . . .
4.8.2
Setting SCSI IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.8.2.1
SCSI Jumpers and Switches . . . . . . . . . . . . . . . . .
4.9
Removing and Installing Storage Devices . . . . . . . . . . . . .
4.9.1
Nonremovable Media Devices Contained in Mass
Storage Drawers . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.1.1
Removing/Installing an RZ57 . . . . . . . . . . . . . . . . .
4.9.1.1.1
Replacing RZ57 Drive Module . . . . . . . . . . . . .
4.9.1.2
Removing/Installing an RZ58 . . . . . . . . . . . . . . . . .
4.9.2
Removable Media Devices Contained in Mass Storage
Drawers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.2.1
Removing/Installing an RRD42 . . . . . . . . . . . . . . .
4.9.2.2
Removing/Installing an RX26 . . . . . . . . . . . . . . . . .
4.9.2.2.1
Setting RX26 SCSI ID Switches . . . . . . . . . . . .
4.9.2.3
TKZ09 (Internal Model) . . . . . . . . . . . . . . . . . . . . .
4.9.2.4
Removing/Installing an Internal TLZ04 . . . . . . . . .
4.9.2.5
TLZ06 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.2.6
Removing/Installing a TZ30 . . . . . . . . . . . . . . . . . .
4.9.2.7
Removing/Installing an Internal TZ85 . . . . . . . . . .
4.9.2.8
Removing/Installing a TZK10 . . . . . . . . . . . . . . . . .
4.9.3
Removing/Installing External Options . . . . . . . . . . . . .
4.9.3.1
StorageServer 100 . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.3.2
TKZ08 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.3.3
TKZ09 (External Model) . . . . . . . . . . . . . . . . . . . .
4.9.3.4
TSZ07 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.3.5
TZ85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.3.6
TZ857 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.4
Removing/Installing Rackmounted Options . . . . . . . . .
4.9.4.1
StorageServer 100 (Rackmounted) . . . . . . . . . . . . .
4.9.4.1.1
Connecting/Disconnecting a Rackmounted
StorageServer 100 . . . . . . . . . . . . . . . . . . . . . .
4.9.4.1.2
Removing the Rackmounted StorageServer
100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.4.1.3
Installing the Dress Mid Panel . . . . . . . . . . . .
4.9.4.1.4
Installation in the DECsystem 5900
Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.4.1.5
Setting the SCSI IDs . . . . . . . . . . . . . . . . . . . .
viii

4–38
4–38
4–41
4–43
4–43
4–45
4–45
4–45
4–46
4–47
4–47
4–47
4–50
4–52
4–55
4–55
4–57
4–58
4–64
4–67
4–70
4–72
4–75
4–78
4–80
4–80
4–85
4–88
4–91
4–93
4–96
4–99
4–99
4–100
4–102
4–105
4–105
4–107

Assembling and Installing the Rackmount
Slides and Cross Bracket . . . . . . . . . . . . . . . . .
4.9.4.1.7
Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . .
4.9.4.1.8
Power-On Test . . . . . . . . . . . . . . . . . . . . . . . . .
4.9.4.1.9
Using the Console Command CNFG . . . . . . . .
4.10
Removing Mass Storage Drawers . . . . . . . . . . . . . . . . . . . .
4.10.1
Mass Storage Drawer 1 . . . . . . . . . . . . . . . . . . . . . . . .
4.10.2
Mass Storage Drawer 2 . . . . . . . . . . . . . . . . . . . . . . . .
4.11
Installing Mass Storage Drawers and Slides . . . . . . . . . . .
4.11.1
Assembling Slides . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.11.2
Installing Assembled Slides in the Cabinet . . . . . . . . .
4.11.3
Removing Devices from the Drawer . . . . . . . . . . . . . . .
4.11.4
Installing the Drawer in the Cabinet . . . . . . . . . . . . . .
4.11.4.1
Mass Storage Drawer 1 . . . . . . . . . . . . . . . . . . . . .
4.11.4.2
Mass Storage Drawer 2 . . . . . . . . . . . . . . . . . . . . .
4.11.5
Replacing the Devices in the Drawer . . . . . . . . . . . . . .
4.11.6
Pushing In and Securing the Drawer . . . . . . . . . . . . . .
4.11.7
Connecting Power and SCSI Cables . . . . . . . . . . . . . . .

4.9.4.1.6

4–109
4–114
4–114
4–114
4–115
4–115
4–117
4–119
4–119
4–121
4–123
4–123
4–123
4–126
4–128
4–128
4–128

A Field-Replaceable Units and Part Numbers
Index
Figures
1–1
1–2
1–3
1–4
1–5
1–6
1–7
1–8
1–9
1–10
1–11
1–12

DECsystem 5900 Enclosure . . . . . . . . . . . . . . . . . . . . .
The DECsystem 5900 System—Front Open-Door
View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The DECsystem 5900 System—Rear Open-Door
View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Controller Switches and Outlets . . . . . . . . . . . .
Sample Power Cable/Bus Configuration . . . . . . . . . . . .
CPU Drawer Front Panel . . . . . . . . . . . . . . . . . . . . . . .
CPU Drawer Rear Panel . . . . . . . . . . . . . . . . . . . . . . .
CPU Drawer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU Drawer Blower . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU Drawer Power Supply . . . . . . . . . . . . . . . . . . . . .
System Module, CPU/Daughter Card, Memory Options
and TURBOchannel Slots . . . . . . . . . . . . . . . . . . . . . .
CPU Drawer TURBOchannel Extender Module . . . . . .

1–2
1–4
1–5
1–6
1–8
1–11
1–12
1–13
1–15
1–17
1–19
1–20
ix

1–13
1–14
1–15
1–16
1–17
1–18
1–19
1–20
2–1
2–2
2–3
2–4
2–5
2–6
2–7
2–8
2–9
2–10
2–11
2–12
2–13
2–14
2–15
2–16
2–17
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8

Mass Storage Drawer 1 Front Panel . . . . . . . . . . . . . .
Mass Storage Drawer 1 Rear Panel . . . . . . . . . . . . . . .
Internal View of Mass Storage Drawer Devices . . . . . .
Mass Storage Drawer 1 Power Supply and Harness . .
Mass Storage Drawer 2 Front Panel . . . . . . . . . . . . . .
Mass Storage Drawer 2 Rear Panel . . . . . . . . . . . . . . .
Internal View of Mass Storage Drawer 2 Devices . . . .
Mass Storage Drawer 2 Power Supply and Harness . .
DECsystem 5900 Enclosure Dimensions . . . . . . . . . . .
Wheel Lock Removal . . . . . . . . . . . . . . . . . . . . . . . . . .
Leveling the System . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front and Side Skirts . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Skirt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attaching the Lower Rear Skirt Panel . . . . . . . . . . . . .
Opening the Front Enclosure Door . . . . . . . . . . . . . . .
Opening the Rear Enclosure Door . . . . . . . . . . . . . . . .
Mass Storage Drawer Lower Plate . . . . . . . . . . . . . . . .
Mass Storage Drawer Bracket Screws . . . . . . . . . . . . .
Mass Storage Drawer 2 Restraint Bracket . . . . . . . . . .
Connecting the Console Terminal and Ethernet
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning On the Power Controller . . . . . . . . . . . . . . . . .
Power Switches on the Front of the CPU Drawer . . . .
Power Switch on the Front of Mass Storage Drawer
1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Switch on the Rear of Mass Storage Drawer
1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Switch on the Rear of Mass Storage Drawer
2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening the Front Enclosure Door . . . . . . . . . . . . . . .
Opening the Rear Enclosure Door . . . . . . . . . . . . . . . .
Removing the Power Controller . . . . . . . . . . . . . . . . . .
CPU Drawer Compartments and Covers . . . . . . . . . . .
Stabilizing the Enclosure . . . . . . . . . . . . . . . . . . . . . . .
Pulling Out the CPU Drawer . . . . . . . . . . . . . . . . . . . .
Pushing In the CPU Drawer . . . . . . . . . . . . . . . . . . . .
Opening the CPU Drawer Front Top Cover . . . . . . . . .

1–22
1–23
1–24
1–26
1–27
1–28
1–29
1–31
2–2
2–7
2–8
2–9
2–10
2–11
2–12
2–13
2–14
2–15
2–16
2–17
2–18
2–19
2–20
2–20
2–21
3–2
3–3
3–5
3–7
3–9
3–10
3–11
3–13

3–9
3–10
3–11
3–12
3–13
3–14
3–15
3–16
3–17
3–18
3–19
3–20
3–21
3–22
3–23
3–24
3–25
3–26
3–27
3–28
3–29
3–30
3–31
3–32
3–33
3–34
3–35
4–1
4–2
4–3
4–4
4–5
4–6

Opening the Middle Top Cover Upright . . . . . . . . . . . .
Latching the Middle Top Cover Upright . . . . . . . . . . . .
Opening the CPU Drawer Rear Top Cover . . . . . . . . . .
Removing the CPU Drawer Blower . . . . . . . . . . . . . . .
Removing the CPU Drawer Power Supply . . . . . . . . . .
Locating the Power Distribution Module . . . . . . . . . . .
Disconnecting the Power Distribution Module from the
System Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the Power Distribution Module from the
TURBOchannel Extender Module . . . . . . . . . . . . . . . .
Removing the Power Distribution Module . . . . . . . . . .
Removing the CPU/Daughter Card . . . . . . . . . . . . . . .
Installing the CPU/Daughter Card . . . . . . . . . . . . . . .
Removing the MS02–CA Memory Module . . . . . . . . . .
Removing the MS02–NV Module . . . . . . . . . . . . . . . . .
Removing a TURBOchannel Option . . . . . . . . . . . . . . .
PMAD TURBOchannel Option . . . . . . . . . . . . . . . . . . .
DEC WANcontroller 720 TURBOchannel Option . . . . .
CITCA TURBOchannel Option . . . . . . . . . . . . . . . . . .
System Module in the Stiffener . . . . . . . . . . . . . . . . . .
Removing the System Module . . . . . . . . . . . . . . . . . . .
Removing CPU Compartment Blank Panels . . . . . . . .
Removing the TURBOchannel Extender Module . . . . .
Stabilizing the Enclosure . . . . . . . . . . . . . . . . . . . . . . .
Removing the CPU Drawer . . . . . . . . . . . . . . . . . . . . .
Removing the Cable Arm . . . . . . . . . . . . . . . . . . . . . . .
Attaching the Rear Bracket and Slides to the
Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Attaching the Front of the CPU Slides to the
Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the CPU Drawer . . . . . . . . . . . . . . . . . . . . .
Removing Filler Panel(s) . . . . . . . . . . . . . . . . . . . . . . .
Removing Drawer Front Hex Screws . . . . . . . . . . . . . .
Pulling Out a Mass Storage Drawer . . . . . . . . . . . . . .
Pushing In a Mass Storage Drawer . . . . . . . . . . . . . . .
Opening the Mass Storage Drawer 1 Storage
Compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–15
3–16
3–17
3–19
3–21
3–23
3–24
3–25
3–26
3–28
3–29
3–30
3–31
3–33
3–34
3–35
3–36
3–37
3–39
3–40
3–42
3–44
3–46
3–47
3–49
3–50
3–52
4–3
4–5
4–6
4–7
4–9
4–11
xi

4–7
4–8
4–9
4–10
4–11
4–12
4–13
4–14
4–15
4–16
4–17
4–18
4–19
4–20
4–21
4–22
4–23
4–24
4–25
4–26
4–27
4–28
4–29
4–30
4–31
4–32
4–33
xii

Removable Media Device Bracket . . . . . . . . . . . . . . . .
Removing a Drive Bracket . . . . . . . . . . . . . . . . . . . . . .
Removing a Device from a Drive Bracket . . . . . . . . . . .
Device Orientation Within a Drawer . . . . . . . . . . . . . .
Removable Media Slot Filler Panels . . . . . . . . . . . . . . .
Removing a Removable Media Device Bracket . . . . . . .
Removing a Full-Height Device from a Removable
Media Device Bracket . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Half-Height Device from a Removable
Media Device Bracket . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Mass Storage Drawer 1 Power
Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Opening the Mass Storage Drawer 2 Storage
Compartment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mass Storage Drawer 2 Drive Bracket . . . . . . . . . . . . .
Mass Storage Drawer 2 Removable Media Device
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Drive Bracket from the Mass Storage
Drawer 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Device from a Bracket . . . . . . . . . . . . . . .
Device Orientation Within a Drawer . . . . . . . . . . . . . .
Removable Media Slot Filler Panels . . . . . . . . . . . . . . .
Removing a Removable Media Device Bracket from the
Mass Storage Drawer 2 . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Full-Height Device from a Mass Storage
Drawer 2 Removable Media Device Bracket . . . . . . . .
Removing a Half-Height Device from a Mass Storage
Drawer 2 Removable Media Device Bracket . . . . . . . .
Removing the Mass Storage Drawer 2 Power
Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Mass Storage Drawer 2 Fans . . . . . . . .
Single Bus Configuration for Mass Storage Drawer
1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Bus Configuration for Mass Storage Drawer
2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Split Bus Configuration for Mass Storage Drawer 1 . .
Split Bus Configuration for Mass Storage Drawer 2 . .
Disconnecting/Connecting an RZ57 . . . . . . . . . . . . . . .
SCSI ID Jumpers on an RZ57 . . . . . . . . . . . . . . . . . . .

4–12
4–13
4–14
4–15
4–16
4–18
4–19
4–20
4–22
4–23
4–25
4–26
4–27
4–28
4–29
4–30
4–32
4–33
4–34
4–36
4–37
4–39
4–40
4–41
4–42
4–48
4–49

4–34
4–35
4–36
4–37
4–38
4–39
4–40
4–41
4–42
4–43
4–44
4–45
4–46
4–47
4–48
4–49
4–50
4–51
4–52
4–53
4–54
4–55
4–56
4–57
4–58
4–59
4–60
4–61
4–62
4–63
4–64
4–65
4–66
4–67
4–68

Replacing the Drive Module on an RZ57 . . . . . . . . . . .
Disconnecting/Connecting an RZ58 . . . . . . . . . . . . . . .
SCSI ID Jumpers on an RZ58 . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting an RRD42 . . . . . . . . . . . . . .
SCSI ID Jumpers on an RRD42 . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting an RX26 . . . . . . . . . . . . . . .
Disconnecting/Connecting an RX26 Adapter Interface
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detaching/Attaching Adapter Brackets . . . . . . . . . . . .
Setting the RX26 Drive ID Switch . . . . . . . . . . . . . . . .
SCSI ID Switches on an RX26 . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting an Internal TKZ09 . . . . . . .
SCSI ID Switches on an Internal TKZ09 . . . . . . . . . . .
Disconnecting/Connecting a TLZ04 . . . . . . . . . . . . . . .
SCSI ID Jumpers on a TLZ04 . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting a TLZ06 . . . . . . . . . . . . . . .
SCSI ID Switches on a TLZ06 . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting a TZ30 . . . . . . . . . . . . . . . .
SCSI ID Switches on a TZ30 . . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting an Internal TZ85 . . . . . . . .
SCSI ID Switches on an Internal TZ85 . . . . . . . . . . . .
Disconnecting/Connecting a TZK10 . . . . . . . . . . . . . . .
SCSI ID Jumpers on a TZK10 . . . . . . . . . . . . . . . . . . .
External StorageServer 100 Rear Panel . . . . . . . . . . . .
External StorageServer 100 SCSI ID Switches . . . . . .
Disconnecting/Connecting a TKZ08 . . . . . . . . . . . . . . .
SCSI ID Incremental Switch on a TKZ08 . . . . . . . . . .
Disconnecting/Connecting an External TKZ09 . . . . . . .
SCSI ID Switches on a TKZ09 . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting a TSZ07 . . . . . . . . . . . . . . .
Disconnecting/Connecting an External TZ85 . . . . . . . .
SCSI ID Switches on an External TZ85 . . . . . . . . . . . .
Disconnecting/Connecting a TZ857 . . . . . . . . . . . . . . .
SCSI ID Switches on a TZ857 . . . . . . . . . . . . . . . . . . .
Disconnecting/Connecting a Rackmounted
StorageServer 100 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the StorageServer 100 from the Cabinet . . .

4–51
4–53
4–54
4–56
4–56
4–59
4–60
4–61
4–62
4–63
4–65
4–66
4–68
4–69
4–70
4–71
4–73
4–74
4–76
4–77
4–78
4–79
4–82
4–84
4–86
4–87
4–89
4–90
4–92
4–94
4–95
4–97
4–98
4–101
4–104

xiii

4–69
4–70
4–71
4–72
4–73
4–74
4–75
4–76
4–77

SCSI ID Switches on a Rackmounted StorageServer
100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Components of the Slide Assembly/Complete Slide
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembling and Installing the Rackmounted Slide
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a Mass Storage Drawer 1 . . . . . . . . . . . . . .
Removing a Mass Storage Drawer 2 . . . . . . . . . . . . . .
Assembling Mass Storage Drawer Slides . . . . . . . . . . .
Installing Mass Storage Drawer Slides . . . . . . . . . . . .
Installing a Mass Storage Drawer 1 . . . . . . . . . . . . . . .
Installing a Mass Storage Drawer 2 . . . . . . . . . . . . . . .

4–108
4–110
4–113
4–116
4–118
4–120
4–122
4–125
4–127

Tables
1–1
1–2
1–3
1–4
1–5
1–6
1–7
1–8
1–9
1–10
1–11
1–12
2–1
2–2
2–3
3–1
3–2
3–3
4–1
4–2
4–3
xiv

Power Controller Switch and Outlet Functions . . . . . .
Options in the CPU Drawer . . . . . . . . . . . . . . . . . . . . .
Where to Find Mass Storage Drawer Information . . . .
Options in the Mass Storage Drawer . . . . . . . . . . . . . .
Rackmounted Options . . . . . . . . . . . . . . . . . . . . . . . . .
External Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .
TURBOchannel Slots . . . . . . . . . . . . . . . . . . . . . . . . . .
SCSI ID Factory Configuration . . . . . . . . . . . . . . . . . .
Mass Storage Drawer Cables . . . . . . . . . . . . . . . . . . . .
System Cables and Buses . . . . . . . . . . . . . . . . . . . . . .
DECsystem 5900 Switches . . . . . . . . . . . . . . . . . . . . . .
Temperature and Relative Humidity Values . . . . . . . .
DECsystem 5900 Enclosure Electrical
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Power Cables by Country . . . . . . . . . . . . . . .
CPU Drawer Covers . . . . . . . . . . . . . . . . . . . . . . . . . . .
CPU Compartment Modules and Location in This
Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drawer Locations on the Cabinet Rails . . . . . . . . . . . .
Mass Storage Drawer Information . . . . . . . . . . . . . . . .
Internal Storage Devices/Required Brackets . . . . . . . .
Configuration Option Choices/Advantages . . . . . . . . . .

1–7
1–18
1–21
1–32
1–32
1–33
1–33
1–35
1–36
1–37
1–37
1–39
2–3
2–4
2–4
3–6
3–36
3–48
4–8
4–10
4–38

4–4
4–5
4–6
4–7
4–8
4–9
4–10
4–11
4–12
4–13
4–14
4–15
4–16
4–17
4–18
4–19
A–1
A–2

DECsystem 5900 SCSI Device ID Default Settings . . .
Common Devices and SCSI ID Method Used . . . . . . . .
RZ57 SCSI Device ID Settings . . . . . . . . . . . . . . . . . . .
RZ58 SCSI Device ID Settings . . . . . . . . . . . . . . . . . . .
RRD42 SCSI Device ID Settings . . . . . . . . . . . . . . . . .
RX26 SCSI Device ID Settings . . . . . . . . . . . . . . . . . . .
TKZ09 SCSI Device ID Settings . . . . . . . . . . . . . . . . . .
TLZ04 SCSI Device ID Settings . . . . . . . . . . . . . . . . . .
TLZ06 SCSI Device ID Settings . . . . . . . . . . . . . . . . . .
TZ30 SCSI Device ID Settings . . . . . . . . . . . . . . . . . . .
Internal TZ85 SCSI Device ID Settings . . . . . . . . . . . .
TZK10 SCSI Device ID Settings . . . . . . . . . . . . . . . . . .
StorageServer 100 SCSI Device ID Settings . . . . . . . .
TKZ09 SCSI Device ID Settings . . . . . . . . . . . . . . . . . .
External TZ85 SCSI Device ID Settings . . . . . . . . . . .
TZ857 SCSI Device ID Settings . . . . . . . . . . . . . . . . . .
DECsystem 5900 System FRUs and Part Numbers . . .
DECsystem 5900 System Device Options . . . . . . . . . . .

4–45
4–46
4–49
4–54
4–57
4–63
4–66
4–69
4–71
4–74
4–77
4–79
4–85
4–90
4–95
4–99
A–1
A–4

Preface
Product Description
The DECsystem 5900 system is designed for server applications, including file
servers, compute servers, and network servers. It is a midrange system that uses
a modular approach, based on industry standard 47.5 cm (19 in) rackmounted
components.
The original model, the DECsystem 5900 system, utilizes a high-performance
single-card computer based on the MIPS R3000A processor. A more recent
version, the DECsystem 5900/260 system is based on the MIPS R4400 processor.
Both systems are housed in a single-cabinet configuration that contains a power
controller, a CPU drawer, and up to four additional mass storage drawers.

Document Description
Since versions of the system are identical except for the actual processor
(CPU/daughter card), for clarity and simplicity this manual refers to both the
DECsystem 5900 system and the DECsystem 5900/260 system as simply the
DECsystem 5900 system. Where unique information for a particular processor is
required, pertinent differences are pointed out.
This manual describes the DECsystem 5900 system server configurations,
explains installation procedures, and provides step-by-step instructions for
Field Replaceable Unit (FRU) removal and replacement by Digital service
representatives.
Any service or upgrades needed inside the DECsystem 5900 cabinet must be done
by a Digital service representative.

Audience
The DECsystem 5900 Enclosure Maintenance Manual is for use by Digital service
representatives only.

xvii

Document Structure
The DECsystem 5900 Enclosure Maintenance Manual contains four chapters and
one appendix, as follows:
Chapter 1

DECsystem 5900 Enclosure
This chapter provides a physical description of the DECsystem 5900
system, and an overview of the system’s cables and power switches.

Chapter 2

DECsystem 5900 System Installation
This chapter explains how to install the DECsystem 5900 system.

Chapter 3

Enclosure and CPU Drawer FRU Removal and Replacement
This chapter describes removal and installation of field-replaceable
units (FRUs) in the enclosure and the CPU drawer, as well as
replacement of the drawer itself.

Chapter 4

Mass Storage FRU Removal and Replacement
This chapter describes removal and installation of field-replaceable
units (FRUs) in the mass storage drawers, as external devices,
and as rackmounted devices, as well as replacement of the drawers
themselves.

Appendix A

Field-Replaceable Units (FRUs) and Part Numbers
Appendix A lists the major FRUs, devices and options in the
DECsystem 5900 system.

Conventions Used in This Document
The DECsystem 5900 Enclosure Maintenance Manual uses the following
conventions:
Convention

Indicates

boldface type

User input.

italic type

Important information, variables, and complete titles of manuals.

Note

General information about the current topic.

Caution

Information to prevent damage to equipment or software. Read
these carefully.

WARNING

Information to prevent personal injury. Read these carefully.

xviii

1
DECsystem 5900 Enclosure
1.1 DECsystem 5900 System Overview
The DECsystem 5900 system is a RISC/ULTRIX system for server applications,
including file servers, compute servers, and network servers. It is a highly
modular system that has many configuration capabilities. The basic configuration
is a single-cabinet uniprocessor. The original DECsystem 5900 system is based
on a high-performance single-module computer that utilizes the MIPS R3000A
processor. The DECsystem 5900/260 system utilizes a MIPS R4400 processor.
All versions of the system are referred to in this manual as the DECsystem
5900 system. Where unique information for a particular processor is required,
pertinent differences are pointed out.
The DECsystem 5900 system uses the following devices:
•

Up to fourteen 32-Mbyte memory modules

•

1-Mbyte NVRAM memory for Prestoserve(TM) support

•

Internal storage for up to 28 SCSI devices

•

Support for all TURBOchannel devices that conform to the TURBOchannel
specification

This chapter describes the following parts of the DECsystem 5900 system:
•

Enclosure contents and options

•

CPU drawer contents and options

•

Mass storage drawer contents and options

•

Power controllers and power supplies

•

External storage options

•

Power requirements

•

Cables and buses

DECsystem 5900 Enclosure 1–1

1.1.1 Enclosure Description
The DECsystem 5900 system uses a free-standing H9A00 enclosure with
rackmounted drawers, shown in Figure 1–1, and is designed to be used in a
computer room environment. It normally rests upon four levelers, but comes
equipped with wheels for easy installation and placement.
The cabinet may be accessed by both the front and rear doors. Use the front door
to turn on and turn off the system, and to access removable media or the drawers.
Use the rear door to access cable connections, ports, and the power controller.
The front doors have magnetic latches to keep the doors closed; both front and
rear doors can be locked and unlocked with a key (12–26339–01) or with a
1/4-inch hex wrench.
Figure 1–1 DECsystem 5900 Enclosure

MLO-007705

Front door

Front door latches

1–2 DECsystem 5900 Enclosure

Hex wrench

The DECsystem 5900 system consists of:
•

H9A00 cabinet

•

Drawers:
CPU drawer
One mass storage drawer for devices
Optional second CPU drawer
Up to 3 additional mass storage drawers (optional)

•

Power controller

•

Network, data, power cables and SCSI bus(es)

The DECsystem 5900 cabinet includes trim panels, called skirts, which are
attached to the bottom during installation.
The location of the CPU drawer in relation to mass storage drawers varies
according to the options ordered when the system was shipped. See Figure 1–2
and Figure 1–3 for examples of how drawers or filler panels might be positioned.
Filler panels cover unused enclosure slots, as well as slot 0, which contains the
power controller.

DECsystem 5900 Enclosure 1–3

Figure 1–2 The DECsystem 5900 System—Front Open-Door View

3
4
5

6
7
8
10

MLO-007649

Door latches
Stabilizer bar (use when
extending any drawer)

CPU drawer (slot 3)

Filler panel covering empty slot (slot 2) or optional
second CPU drawer.

Mass storage drawer (slot 6)

Mass storage drawer (slot 1)

Mass storage drawer (slot 5)

Screw-down leveling feet

Mass storage drawer (slot 4)

Filler panel (slot 0) covering power controller (in
rear)

1–4 DECsystem 5900 Enclosure

Figure 1–3 The DECsystem 5900 System—Rear Open-Door View

5
6
1

8
9
10
2
3

11
MLO-007653

Door latches

CPU drawer (slot 3)

Power controller (slot 0)

Cable arm

Power cable

Empty drawer slot (slot 2)

Mass storage drawer (slot 6)

Mass storage drawer (slot 1)

Mass storage drawer (slot 5)

Screw-down leveling feet

Mass storage drawer (slot 4)

DECsystem 5900 Enclosure 1–5

1.1.1.1 Cooling Scheme
Air enters the front of the cabinet, and exits from the rear. Each drawer has its
own specific cooling arrangements, including blowers or fans; the cabinet itself
has no cooling fans or blower.
1.1.1.2 Enclosure Power Controller
The DECsystem 5900 enclosure uses a single-phase ac power controller to
supply power to the cabinet, located in the bottom rear of the H9A00 enclosure.
Switches, shown in Figure 1–4 and defined in Table 1–1, all face toward the rear
of the enclosure, and are accessed through the rear enclosure door.
There are two models of power controllers, a 120 V version (used in the US),
and a 220 V version for international use. The 120 V US model has an attached
ac power cord; the international model has a removable cord for the country in
which it is used.
Figure 1–4 Power Controller Switches and Outlets

4
3

5
2
1

MLO-007654

Remote/local toggle switch. This switch should be set to the remote position
(up) to turn on the system using the upper switch on the front of the CPU
drawer.
Power controller cable from remote sensors to the CPU drawer upper front
switch

Circuit breaker (up is on)

1–6 DECsystem 5900 Enclosure

System power cable (see Table 2–3)
Outlets for drawer power cables
Table 1–1 Power Controller Switch and Outlet Functions
Switch/Outlet

Function

Remote/local toggle switch

On the remote setting, the CPU drawer can be used to
turn the system on/off

Circuit breaker

Emergency power cutoff

Outlets

Power source for CPU and mass storage drawer(s)

Power cable

System power

Remote power sensors

Automatic shutdown of external devices

1.1.1.2.1 Power Distribution Power is distributed from the power controller
throughout the enclosure to both CPU and mass storage drawers via standard
IEC 320 power cables, which are of uniform length and tie-wrapped to the
enclosure frame. The power controller distributes power at the same voltage at
which it enters the cabinet, that is, 120 V nominal or 220 V nominal, 50/60 Hz.
A three-pin connector cable from the power controller to the CPU drawer allows
for a single point of system power control: the upper front switch of the CPU
drawer. (The remote/local switch must be set to remote to allow for this.)
To organize and protect the many cables and buses attached to the CPU drawer,
they are routed through a cable arm which extends and retracts as the drawer is
pulled out and pushed in.
Figure 1–5 depicts a sample power cable/bus configuration for the DECsystem
5900 system.

DECsystem 5900 Enclosure 1–7

Figure 1–5 Sample Power Cable/Bus Configuration

6
3
2

1
AC power cable
Console cable

Ethernet cable

MLO-008354

Power cables to drawers

SCSI bus cables (mass storage drawers to CPU
drawer)
CPU drawer cable arm

See Section 4.6 for details on the configuration of devices in a mass storage
drawer.

1–8 DECsystem 5900 Enclosure

1.1.1.2.2 Uninterruptible Power Supply An optional external uninterruptible
power supply (UPS) can be added to provide reliable power to the DECsystem
5900 cabinet.
1.1.1.2.3 Power Sequencing The ac power controller is connected to the upper
switch on the front of the CPU drawer. When the power controller remote/local
switch is in the remote position (up), the upper switch on the front of the CPU
drawer controls power to the entire system.
When the Remote/Local switch is in local mode (down), the individual drawers
must be turned on or off manually.
Each individual drawer contains its own ac power switch. Power within a
particular drawer is available if all of the following conditions are met:
•

AC power is available into the cabinet.

•

1/8-A fuse in power controller is intact.

•

The power controller breaker switch is on.

•

The drawer’s power sequence cable is plugged in at the power controller.

•

The CPU drawer’s main power switch is in the on position (this assumes that
the power controller is switched to remote mode).

•

The drawer’s power switch is on.

1.1.1.3 CPU and Mass Storage Drawers
The DECsystem 5900 system is shipped complete with all drawers ordered by the
customer, and filler panels over unused drawer slots. The minimum configuration
is one CPU drawer and one mass storage drawer. Each drawer contains one or
more components of the DECsystem 5900 system. These components may include
the following:
•

In the CPU drawer:
System module
CPU/daughter card
Two or more memory modules
NVRAM module
TURBOchannel option slots
TURBOchannel options (if any)
TURBOchannel Extender Adapter module (in option slot 0)
TURBOchannel Extender module
Power supply
Blower
Power cabling
Connectors for Enet, SCSI, and communication ports
DECsystem 5900 Enclosure 1–9

•

In the mass storage drawer:
Fixed media disks
Removable media tape drives, floppy drives, and CD–ROM drives
Power supply
SCSI cabling
Power cabling

Other storage devices may be attached externally to the DECsystem 5900 system.
1.1.1.3.1 Drawer Design The drawers have been designed for efficiency and
serviceability, and include the following features:
•

Slide-out access

•

Latches to prevent accidental removal

•

Individual power control

•

Completely installable as an upgrade

Each drawer has six 5/16-inch hex screws to hold it in place in the cabinet for
shipping. Power to an individual mass storage or CPU drawer may be turned off
independent of other mass storage drawers or CPU drawers.
Note
ULTRIX does not support turning off devices or drawers while it is
running. Run the shutdown procedures before turning off the system or
individual drawers.

1.1.1.3.2 Electromagnetic Interference (EMI) The drawer enclosures and covers
form an electrical noise seal that complies with requirements for EMI by:
•

Containing radio frequency interference generated by the system

•

Keeping external radio frequencies from entering the enclosure
Caution
Drawer enclosures and covers are required to meet international
regulatory standards and to maintain proper cooling.

1–10 DECsystem 5900 Enclosure

1.1.2 CPU Drawer
This section describes the CPU drawer.
1.1.2.1 CPU Drawer Front Panel
Figure 1–6 shows the front panel of a CPU drawer, and identifies each
component.
Figure 1–6 CPU Drawer Front Panel
2

4
MLO-007651

5/16-inch hex screws that secure the drawer to the cabinet for shipping
CPU drawer power switch (should normally be left on)

System power switch (should normally be left on)
DC power LED on indicator

DECsystem 5900 Enclosure 1–11

1.1.2.2 CPU Drawer Rear Panel
Figure 1–7 shows the rear panel of a CPU drawer.
Figure 1–7 CPU Drawer Rear Panel
1

15
MLO-007741

Not used

TURBOchannel Extender module slots

Halt switch

TURBOchannel Extender I/O (connected
)

System console port

AC power receptacle

TURBOchannel option slot 1

Remote power sequence connector

Communications port

System module SCSI port

TURBOchannel option slot 2

TURBOchannel Extender Adapter module
(in option slot 0, connected to )

Diagnostic LEDs

Not used

Standard Ethernet

1.1.2.3 CPU Drawer Components
Figure 1–8 shows the interior side view of a CPU drawer with the three covers
slightly raised to provide a perspective on the relative location of CPU drawer
components.

1–12 DECsystem 5900 Enclosure

Figure 1–8 CPU Drawer
1

12
MLO-007706

Blower for temperature control

Power supply cable

1-Mbyte NVRAM memory SAM (slot 14 of
the memory array is for NVRAM only)

Remote system switch power cable

Air plenum

Power distribution module

32-Mbyte memory modules (2 shown)

CPU/daughter card

Option module mounted on TURBOchannel  System module
Extender module
244 W drawer power supply

TURBOchannel Extender Adapter
module (slot 0 only)

DECsystem 5900 Enclosure 1–13

1.1.2.4 CPU Daughter Card and System Module Features
A DECsystem 5900 CPU drawer contains the following:
•

R3000A or an R4400

•

64 to 448 Mbyte main memory

•

Ethernet controller with DMA (standard connector)

•

SCSI controller with DMA

•

Four serial lines
–

Keyboard (15-pin connector, reserved for future use)

–

Two synch/asynch (25-pin RS232)

•

Three TURBOchannel slots

•

1 Mbyte Prestoserve nonvolatile RAM

•

TURBOchannel Extender Adapter module (in TURBOchannel slot 0)

•

TURBOchannel Extender module

1–14 DECsystem 5900 Enclosure

1.1.2.5 Blower
The CPU drawer contains a temperature controlled 12-volt dc blower attached to
the top front cover (see Figure 1–9).
Figure 1–9 CPU Drawer Blower
2
3
1

4
5
MLO-007709

Blower power cable
CPU drawer blower

System power switch
CPU drawer switch

Front top cover

DECsystem 5900 Enclosure 1–15

1.1.2.6 Power Supply
The CPU drawer power supply is located in the lower front compartment of the
drawer (see Figure 1–10). Power is distributed from the power supply to the
system module via a power cable which runs inside the isolator along the CPU
drawer wall. A power distribution module is attached to the rear wall of the
power supply compartment.
Power to the blower from the power controller is regulated according to the
temperature.
For clarity, Figure 1–10 has been illustrated with the front plate of the CPU
drawer removed.

1–16 DECsystem 5900 Enclosure

Figure 1–10 CPU Drawer Power Supply

3
1

2
0

4
MLO-007708

Power distribution module
CPU drawer power supply

Front top cover
CPU drawer switch

DECsystem 5900 Enclosure 1–17

1.1.2.7 CPU Drawer Options
The options in Table 1–2 are available for a CPU drawer. (Appendix A contains a
listing of all DECsystem 5900 FRUs.)
Table 1–2 Options in the CPU Drawer
Type

FRU

Description

Memory options

MS02–CA

Memory 32-MB SAM (up to 14 per
system)

NVRAM for
Prestoserve

MS02–NV

1 MB (one only per system)

TURBOchannel
options

PMAD–AA

Standard Ethernet

PMAZ–AA

SCSI

DEFZA–CA

FDDI

CITCA–AA

TURBOchannel to CI adapter, three slots
wide

DEC WANcontroller 720

TURBOsync two-port synchronous comm
interface

VME

Module/enclosure, single slot

Figure 1–11 shows the system module, CPU/daughter card, and the location of
options and slots on the system module in a CPU drawer.

1–18 DECsystem 5900 Enclosure

Figure 1–11 System Module, CPU/Daughter Card, Memory Options and
TURBOchannel Slots

4
3
2
1

8
0

7
6

MLO-009767

CPU/daughter card
System module

MS02–CA memory slots
MS02–CA memory (two modules shown)

TURBOchannel slot (slot 2) with
sample option module

TURBOchannel Extender Adapter module
(slot 0)

TURBOchannel slot (slot 1) with
sample option module

Middle top cover (includes rear top cover and
TURBOchannel Extender compartment)

MS02–NV NVRAM module

DECsystem 5900 Enclosure 1–19

1.1.2.8 TURBOchannel Extender Module
Figure 1–12 shows the location of the TURBOchannel Extender module with
sample option modules. The rear top cover of the CPU drawer has been removed
for purposes of illustration.
Figure 1–12 CPU Drawer TURBOchannel Extender Module
2

3
1

4
5

MLO-007742

Middle top cover
TURBOchannel Extender module

Sample TURBOchannel option in extender

TURBOchannel Extender adapter module
System module

1–20 DECsystem 5900 Enclosure

1.1.3 Mass Storage Drawer Description
The DECsystem 5900 cabinet has at least one drawer (and possibly up to four
drawers, depending upon the configuration chosen by the customer) devoted to
storage devices. These are called mass storage drawers.
There are two different mass storage drawer designs. You may encounter either
or both versions in a particular DECsystem 5900 system, depending on when it
was manufactured and whether or not a mass storage upgrade has been added.
1.1.3.1 Mass Storage Drawer Information
Before beginning a service procedure or upgrade, you must identify which type
of drawer you will be working on, and refer to the appropriate section of this
chapter for guidance. Use Table 1–3 to determine where the information you
need is located.
Table 1–3 Where to Find Mass Storage Drawer Information
Mass Storage
Drawer 1

Mass Storage
Drawer 2

Power switch on drawer front

Yes

Top cover

Two sections with screws

One piece

Exposed fans on rear of drawer

Yes

For detailed information see:

Section 1.1.4

Section 1.1.6

Distinguishing Features

The options available in mass storage drawers are the same regardless of the
design of the drawer. For a list of available options, see Section 1.1.8.
1.1.3.2 Removable and Nonremovable Media Devices
Two types of storage options are available for mass storage drawers:
•

Removable media devices, which are physically changed by the customer, such
as tapes and CDs. Removable media devices are always located in one of the
removable media slots at the right front of the mass storage drawer, and can
accommodate either one full-height, or two half-height devices with a divider
in the middle.

•

Nonremovable media devices such as hard disk drives, in which the media is
not changed.

DECsystem 5900 Enclosure 1–21

1.1.4 Mass Storage Drawer 1
This section decribes the mass storage drawer 1.
1.1.4.1 Mass Storage Drawer 1 Front Panel
Figure 1–13 shows the front panel of a mass storage drawer 1, and identifies each
component.
Figure 1–13 Mass Storage Drawer 1 Front Panel

4
MLO-007650

Air inlet
Power switch—green LED illuminates to indicate power is on

Optional full-height removable media device (TLZ04 shown)
Optional half-height removable media devices (TZ30s shown)

1–22 DECsystem 5900 Enclosure

1.1.4.2 Mass Storage Drawer 1 Rear Panel
Figure 1–14 shows the rear panel of a mass storage drawer 1.
Figure 1–14 Mass Storage Drawer 1 Rear Panel
4

MLO-007655

Power switch (should normally be left on)
Power cable that connects to main power controller

Ports for SCSI bus cable that connects to a SCSI controller, tabletop device,
and a terminator
Air outlet
1.1.4.3 Mass Storage Drawer 1 Interior Compartments
Each mass storage drawer provides mounting, power, and cooling for up to seven
13-cm (5.25-in) SCSI devices. The two right front device positions are designed
to mount either fixed or removable media devices. The far right-hand position
can mount either one full-height device or two half-height devices, as shown in
Figure 1–15. The drawers contain both SCSI-IN and SCSI-OUT ports, and can be
configured for either one or two (split) SCSI buses.
Power is distributed from the mass storage drawer power supply by means of an
internal power harness with 4-pin power connectors for up to seven mass storage
devices.

DECsystem 5900 Enclosure 1–23

Figure 1–15 Internal View of Mass Storage Drawer Devices
4

2
3

Full-height nonremovable storage options
Full-height removable or nonremovable storage option

Half-height removable storage options
Drawer power supply

1–24 DECsystem 5900 Enclosure

MLO-007657

1.1.4.4 Mass Storage Drawer 1 SCSI Signal Buses
There are two SCSI signal buses in each mass storage drawer which may be
configured as a single bus cable or in a split bus cable configuration. For details
and illustrations of signal bus configurations, see Section 4.6.
1.1.4.5 Mass Storage Drawer 1 Device Brackets
Each device is held in place within the mass storage drawer with a particular
bracket, depending upon the size and function of the device.
The drive bracket is used for full-height devices; the removable media device
bracket can accommodate either full- or half-height devices. See Figure 4–6 and
Figure 4–7 for an example of each type of bracket.
Note
Different brackets are used for the same device, depending upon the mass
storage drawer version.

1.1.5 Mass Storage Drawer 1 Power Supply
The mass storage drawer 1 power supply is described below.
1.1.5.1 Power Supply and Power Harness
Each mass storage drawer has a 400 W power supply (with integral fans), shown
in Figure 1–16. Power to each mass storage device is provided by means of the
power bus (harness), which includes seven 4-pin keyed connectors, one for each
mass storage device. The bus is connected to the power supply in the drawer by
means of a 16-pin keyed connector (see Figure 1–16).
1.1.5.2 Mass Storage Drawer 1 Power Switch Cable
A 4-pin keyed connector conducts power from the power supply to the switch in
the front of the drawer. The switch features a built-in power-on LED indicator
which lights when the drawer is turned on. The 4-pin connector plugs in to the
left of the SCSI device power harness (see Figure 1–16).

DECsystem 5900 Enclosure 1–25

Figure 1–16 Mass Storage Drawer 1 Power Supply and Harness

MLO-007746

Mass storage drawer power supply
Mass storage drawer power switch cable

Mass storage drawer power harness (bus)

1–26 DECsystem 5900 Enclosure

1.1.6 Mass Storage Drawer 2
The following section describes the mass storage drawer 2.
1.1.6.1 Mass Storage Drawer 2 Front Panel
Figure 1–17 shows the front panel of a mass storage drawer 2, and identifies each
component.
Figure 1–17 Mass Storage Drawer 2 Front Panel
1

MLO-008356

Air inlet
Optional full-height removable media device (TLZ04 shown)

Optional half-height removable media devices (RRD42s shown)
LED

DECsystem 5900 Enclosure 1–27

1.1.6.2 Mass Storage Drawer 2 Rear Panel
Figure 1–18 shows the rear panel of a mass storage drawer 2.
Figure 1–18 Mass Storage Drawer 2 Rear Panel
1

6
MLO-010172

Port for SCSI bus cable that connects to the CPU drawer
Power switch (should normally be left on)

Fans

Optional connector panel
Power supply
Power cable that connects to main power controller
1.1.6.3 Mass Storage Drawer 2 Interior Compartments
Each mass storage drawer provides mounting, power, and cooling for up to seven
13-cm (5.25-in) SCSI devices. The two right-front device positions are designed
to mount either fixed or removable media devices. The far right-hand position
can mount either one full-height device or two half-height devices, as shown in
Figure 1–19. The drawers contain both SCSI-IN and SCSI-OUT ports, and can be
configured for either one or two (split) SCSI buses.
Power is distributed from the mass storage drawer power supply by means of an
internal power harness with 4-pin connectors for seven mass storage devices.

1–28 DECsystem 5900 Enclosure

Figure 1–19 Internal View of Mass Storage Drawer 2 Devices
1

2
3
MLO-008358

Full-height nonremovable storage options
Full-height removable storage option

Half-height removable storage options
Drawer power supply

DECsystem 5900 Enclosure 1–29

1.1.6.4 Mass Storage Drawer 2 SCSI Signal Buses
There are two SCSI signal buses in each mass storage drawer which may be
configured as a single bus cable or in a split bus cable configuration. For details
and illustrations of signal bus configurations, see Section 4.6.
1.1.6.5 Mass Storage Drawer 2 Device Brackets
Each device is attached to a particular bracket, depending upon the size and
function of the device. The bracket and device slide into slots in the appropriate
positions in the mass storage drawer 2.
The drive bracket is used for full-height devices; the removable media device
bracket can accommodate either full- or half-height devices. See Figure 4–17 and
Figure 4–18 for an example of each type of bracket.
Note
Different brackets are used for the same device, depending upon the mass
storage drawer version.

1.1.7 Mass Storage Drawer 2 Power Supply
The following section describes the power supply for the mass storage drawer 2.
1.1.7.1 Power Supply and Power Harness
Each mass storage drawer has a 400 W power supply (with integral fans), shown
in Figure 1–20. Power to each mass storage device is provided by means of the
power bus (harness), which includes seven 4-pin keyed connectors, one for each
mass storage device. The bus is connected to the power supply in the drawer by
means of a 15-pin keyed connector (see Figure 1–20).
1.1.7.2 Mass Storage Drawer 2 Power Switch Cable and LED
Two separate wires run from the 15-pin keyed connector to a power-on LED
indicator on the front of the drawer which lights when the drawer is turned on. A
2-pin connector conducts power from the power supply to the switch on the rear
of the drawer (see Figure 1–20).

1–30 DECsystem 5900 Enclosure

Figure 1–20 Mass Storage Drawer 2 Power Supply and Harness

1
2

MLO-008360

Mass storage drawer power supply
Mass storage drawer power harness (bus)

Mass storage drawer power switch cable

DECsystem 5900 Enclosure 1–31

1.1.8 Mass Storage Drawer Options
The options in Table 1–4 are available for mass storage drawers. (Appendix A
contains a listing of DECsystem 5900 FRUs.)
Table 1–4 Options in the Mass Storage Drawer
Type

Device Name

Description

Mass storage
options

RZ57

1-Gbyte hard disk

RZ58

1.3-Gbyte hard disk

RX26

2.8-MB 3.5-inch internal floppy disk

RRD42–DA

600-MB CD reader, 5.25-inch device

Removable media
options

TLZ04

1.2-Gbyte DAT (4 mm)

TLZ06

4.0-Gbyte tape (4 mm)

TKZ09

5.0-Gbyte tape (8 mm)

TZ30

95-MB 1/2-inch tape, 5.25-inch drive

TZK10

320-MB QIC tape drive

TZ85

2.6-Gbyte 1/2-inch tape drive

1.1.9 Rackmounted Enclosure Options
The rackmounted options in Table 1–5 are available for the DECsystem 5900.
These options occupy at least one drawer slot in the DECsystem 5900 cabinet.
Table 1–5 Rackmounted Options
Type

Device Name

Description

One slot

Dual CPU

Second CPU drawer

One slot

Mass storage drawer

Complete mass storage drawer upgrade

Two slot

StorageServer 100

Optical disk (juke box)

1–32 DECsystem 5900 Enclosure

1.1.10 External Options
The external options in Table 1–6 are available for the DECsystem 5900 system.
Table 1–6 External Options
Type

Device name

Description

External options

TSZ07

6400-bpi 9-track tape drive, external
tabletop

TKZ08–DA

8-mm EXABYTE(TM) tape, external
tabletop

TKZ09

5.0-Gbyte tape (8-mm)

TZ85

2.6-Gbyte 1/2-inch tape drive

TZ857

18.2-Gbyte 1/2-inch tape drive, 7
cartridges

StorageServer 100

Optical disk (juke box)

1.1.11 Power Requirements
Power requirements for the DECsystem 5900 system are shown in Table 1–7.
Table 1–7 Power Requirements
Category

120 Vac

240 Vac

AC plug type

NEMA L5–30P

Not applicable

CPU drawer

240 watts

Frequency range

47 to 63 Hz

Mass storage drawer

270 watts

Maximum configuration

1560 watts

Nominal voltage

120 volts

220 volts

Power cable type

Attached

Country specific (see Table 2–3)

Start-up current

30 rms A

16 rms A

DECsystem 5900 Enclosure 1–33

1.2 DECsystem 5900 System Processing Capabilities
This section describes the processing capabilities of the DECsystem 5900 system.

1.2.1 System Module Components
The system module includes:
•

256-Kbyte power-up self-test and bootstrap ROM

•

System control and status registers and diagnostic LED indicators

•

RTC-based system clock and 50-byte (5-year) battery backed-up RAM

•

SCC-based serial lines

•

Two RS232 asynchronous serial comm ports with full modem control

•

Error address status register

•

ECC error check/syndrome status register

•

LANCE-based network interface for ThickWire Ethernet

•

Disk/tape interface for SCSI peripherals

•

Three TURBOchannel I/O option connectors

•

TURBOchannel Extender

•

DMA for SCSI Ethernet, and two comm ports

•

Halt switch

1.2.2 CPU/Daughter Card Components
The CPU/daughter card has the following:
•

R3000A MIPS processor CPU/FPU or an R4400 MIPS processor CPU/FPU

•

R/W buffer

•

Processor interface

•

Memory and TURBOchannel interface

•

Clock and configuration logic

1–34 DECsystem 5900 Enclosure

1.2.3 Memory
Up to fourteen 32-Mbyte MS02–CA single inline memory modules (SAMs) may
be connected to the processor module, for a maximum total of 448 Mbytes. The
DECsystem 5900 system will be shipped with a minimum of two 32-Mbyte SAMs.

1.2.4 Prestoserve
A 1-Mbyte MS02–NV memory module is installed in the last memory slot, slot
14. It supports the Prestoserve NFS accelerator. Slot 14 is only used for the
MS02–NV.

1.2.5 TURBOchannel
The system module contains three TURBOchannel option slots. One of these
slots is preconfigured with an adapter module, the TURBOchannel Extender
Adapter module, that is used to connect a TURBOchannel Extender module. The
remaining two slots may be used for one dual or two single TURBOchannel option
modules.
TURBOchannel is an I/O interface which enables 100 Mbyte per second
connection to optional devices such as:
PMAZ (single-ended SCSI)
PMAD (Ethernet)
DEFZA (FDDI)
As shown in Table 1–8 and Figure 1–7, there are three TURBOchannel option
slots on the rear panel of the CPU drawer. TURBOchannel slot 0 contains a
TURBOchannel Extender Adapter module connected to the TURBOchannel
Extender module (TCE), located in the upper rear compartment of the CPU
drawer. TCE is a standard feature of the DECsystem 5900 system, and provides
space for the use of one single, dual, or triple TURBOchannel slot option in
the DECsystem 5900 system without occupying all of the system module
TURBOchannel slots. (Only one option may be used in the TCE whether it
is a single, dual, or triple slot option.)
Table 1–8 TURBOchannel Slots
Slot

Module

TURBOchannel SCSI controller (contains Extender Adapter module),
Figure 1–7

TURBOchannel SCSI controller,  in Figure 1–7; for example, PMAZ

TURBOchannel SCSI controller,  in Figure 1–7; for example, DEFZA

System module,

in Figure 1–7; CPU, system, and memory

DECsystem 5900 Enclosure 1–35

The purpose of the TURBOchannel Extender module is to allow a two- or threeslot TURBOchannel option module to be connected to the DECsystem 5900
system and physically take up only one TURBOchannel slot. This leaves two
slots available for other TURBOchannel options. Without the TURBOchannel
Extender module, certain TURBOchannel options could use up all three slots.

1.2.6 SCSI Interface
The system module contains a 53C94-based DMA SCSI interface similar to
previous Digital RISC systems which will interface with up to seven SCSI
devices. In order to control additional (optional) mass storage drawer devices or
drivers, one or more TURBOchannel SCSI controllers (PMAZ) are required (each
SCSI controller controls 7 SCSI devices).
A fully populated DECsystem 5900 system would have 28 SCSI devices: seven on
the system module port, seven each on two PMAZ modules (slots 1 and 2), and
seven more on a PMAZ located on the TCE (which is connected to slot 0 via the
TURBOchannel Extender Adapter module; see Figure 1–7).
In each mass storage drawer there are two separate SCSI buses. Each bus
has five SCSI connectors. The two SCSI buses can be connected to contain
seven SCSI devices (single bus configuration) for a total of seven SCSI devices
allowed. The SCSI buses may be left unconnected, and terminated separately
(split bus configuration) if so desired. For more information on single and split
configurations, see Section 4.6. A terminator must be located at the end of each
SCSI bus.
On each separate SCSI bus (one or two per mass storage drawer) the individual
devices are tagged with identity (ID) numbers. No two SCSI devices on the same
bus may have the same ID number. If SCSI devices are added, they must be
marked with an appropriate ID sticker.
The factory-set configuration is depicted in Table 1–9.
Table 1–9 SCSI ID Factory Configuration
Device

CPU SCSI adapter

First removable media device

Boot disk or first disk

Remaining disks, in order

1, 2, 3,
4, 6, 5

Remaining removable media devices

6, 4

1–36 DECsystem 5900 Enclosure

Ethernet Interface
The Ethernet hardware is the LANCE-based design used in previous products.
Communications Interface
Two RS–232 ports are provided on the system module. Although these ports
provide full modem support in the hardware, the firmware does not support full
modem control.

1.3 DECsystem 5900 Cables and Buses
This section lists the network and power cables and SCSI buses used by the
DECsystem 5900 system which are not in a drawer (either CPU or mass storage).

1.3.1 Drawer Cables and Buses
A set of power cables and SCSI buses for each of the four possible mass storage
drawers is present in the DECsystem 5900 enclosure when it is shipped, whether
or not a full complement of four mass storage drawers is ordered. Table 1–10
lists the cables and buses that are external to the drawers, and internal to the
enclosure.
Table 1–10 Mass Storage Drawer Cables
Cable or Bus

Function

Power cable

Connects each drawer to the main power controller

SCSI buses

Connects each mass storage drawer to the CPU drawer (SCSI
controller(s))

1.3.2 System Cables
Table 1–11 describes the cables that extend outside the system enclosure.
Table 1–11 System Cables and Buses
Cable or Bus

Function

Console interface

Connects the system console terminal to an H8571–A (MMJ
25-pin connector) on the back of the CPU drawer

Ethernet cable

Connects the system to the local network

FDDI

Connects the system to the local FDDI network

Power cable

Connects the system to a power outlet (see Table 2–3)

External SCSI bus

Connects to tabletop or external devices

DECsystem 5900 Enclosure 1–37

Both CPU and mass storage drawers contain various internal power cables and/or
signal buses. See Figure 1–8 for the CPU power supply cable.
Mass storage drawer versions 1 and 2 internal power cables are shown in
Figure 1–16 and Figure 1–20, respectively.
Details of internal signal cable configurations may be found in Figure 4–28 and
Figure 4–30 for mass storage drawer 1, and Figure 4–29 and Figure 4–31 for
mass storage drawer 2.

1.4 LED Power Indicators and Switches
LEDs
•

CPU drawer—A "dc ok" LED indicator on the front of the CPU drawer lights
when it is turned on (Figure 1–6).

•

Mass storage drawer— A green light on the power switch on the front panel
of the mass storage drawer 1 lights when the storage drawer power is turned
on (Figure 1–13).
Note
Both front and rear power switches must be pressed to the ‘‘on’’ position
for the green LED indicator on the front switch to illuminate.

Switches
Table 1–12 explains the location and function of each DECsystem 5900 switch.

1–38 DECsystem 5900 Enclosure

Table 1–12 DECsystem 5900 Switches
Switch

Location

Function

Circuit breaker

Rear of the system on
the power controller

Limits the current into the cabinet;
can be used as a main power
switch.

System power

Upper switch on the
front of the CPU drawer

Turns the system on and off via the
power controller.

CPU drawer power

Lower switch on the
front of the CPU drawer

Turns the CPU drawer on and off.

Mass storage drawer
power

Rear panel of each
drawer (also front panel
of mass storage drawer
1)

Turns the mass storage drawer on
and off.

Halt

Rear panel of the CPU
drawer

Halts the CPU; the system enters
console mode.

Remote/local toggle

Rear of the system on
the power controller

Sets the power control mode.

Note
Mass storage drawer 1 only: both front and rear power switches must
be pressed to the ‘‘on’’ position for the green LED indicator on the front
switch to illuminate.

See Section 2.3.2 for the DECsystem 5900 system power-up sequence.

DECsystem 5900 Enclosure 1–39

2
DECsystem 5900 System Installation
This chapter contains the procedure for installing the DECsystem 5900 enclosure.

2.1 Site Preparation
The site should be prepared in advance of receipt of the shipment. The following
are general site preparation guidelines.

2.1.1 DECsystem 5900 Physical Dimensions
Figure 2–1 shows the dimensions of the DECsystem 5900 enclosure.
You must leave at least 92 cm (36 inches) of clearance in the front and 56 cm (22
inches) in the rear of the DECsystem 5900 system for service and ventilation. No
space is required on the sides of the enclosure, though you must be sure there is
some way to access the rear on a regular basis.
WARNING
Due to the weight of the equipment, Digital recommends that at
least two people move system and terminal boxes.

DECsystem 5900 System Installation 2–1

Figure 2–1 DECsystem 5900 Enclosure Dimensions
Weight: 440kg (970 lb)
(Dimensions are
Approximate)

61 cm
24.0 in

170 cm
66.9 in

86.4 cm
34.0 in
54 cm
22 in
MLO-007648

2.1.2 Additional Equipment
Make sure there is enough space for terminals and other peripheral equipment.
When you plan the cable routing for multiterminal systems, consider factors such
as safety, convenience, future expansion, and cost. Cabling should be in place and
labeled before you install the system.

2.1.3 Static Electricity
Static electricity can cause system failure and loss of data. To minimize static
buildup, follow these guidelines:
•

Maintain relative humidity of at least 20%.

•

Provide a separately fed electrical circuit for each enclosure ordered (whether
an expander or a system).

2–2 DECsystem 5900 System Installation

•

Provide as many electrical outlets as required for each additional device,
including any tabletop device and console terminal.

2.1.4 Acoustics
The DECsystem 5900 enclosure is designed for use in computer rooms. Data is
measured in accordance with ANSI S12.10–1985 (American National Standards
Institute) and ISO/DIS 7779 (International Standards Organization).
•

LNPE (B) is the noise power emission level (A-weighted sound power level)
measured in bels per 1 pw (reference 1 picowatt). LNPE for the DECsystem
5900 enclosure is 7.2 bels while operating, and 7.0 on standby.

•

LPA is the sound pressure measured in decibels at 1.0 m from the front edge
of the unit and 1.5 m above the floor. LPA for the DECsystem 5900 enclosure
is 57 decibels while operating, and 55 on standby.
Note
The actual noise level is dependent on the type and number of storage
devices and may vary according to your configuration.

2.1.5 Heat Dissipation
Heat dissipation is measured in British thermal units (Btu). Maximum heat
dissipation in the DECsystem 5900 enclosure is 5325 Btu/h.

2.1.6 Temperature and Humidity Values
Table 2–1 lists temperature and relative humidity values for the DECsystem 5900
enclosure.
Table 2–1 Temperature and Relative Humidity Values
Parameter

Operating

Nonoperating

0°C to 32°C
32°F to 90°F

–40°C to 66°C
–40°F to 151°F

Temperature rate of change

11°C per hour maximum
20°F per hour maximum

N/A

Relative humidity

20% to 80% (noncondensing)

10% to 95%

Maximum altitude

3000 m (10,000 ft)

15,000 m (50,000 ft)

Temperature

1 For operation above sea level, decrease the operation temperature by 1.8°C per 1000 m (or 1°F per

1000 ft).

DECsystem 5900 System Installation 2–3

2.1.7 Electrical Requirements
The power source should be adequate to handle the original system and allow for
system expansion. Digital recommends a dedicated circuit from the power source
to each system. Additional power equipment may be required to avoid power
disturbances.
Table 2–2 lists the electrical requirements for the DECsystem 5900 enclosure in
both the 120 Vac and 230 Vac configurations. Table 2–3 lists the power cables
required.
Table 2–2 DECsystem 5900 Enclosure Electrical Requirements
Nominal AC Voltage

120 Vac

230 Vac

Voltage range

88 to 144 Vac

176 to 228 Vac

Power source phase

Single

Nominal frequency

60 Hz

50 Hz

Frequency range

47 to 63 Hz

Maximum steady state current
at nominal voltage

24 A

12 A

Startup current (20 seconds)

30 A

16 A

Maximum inrush current

200 A

Maximum power consumption

1560 W

Table 2–3 Required Power Cables by Country
Cable
Number

Plug
Number

Australia

BN18D–4E
(17–00198–05)

AS 3112–1981

Central Europe

BN18C–4E
(17–00199–10)

CEE7/7

Denmark

BN18P–4E
(17–01255–01)

IEC 309

Europe

BN18P–4E
(17–01255–01)

IEC 309

Country

(continued on next page)

2–4 DECsystem 5900 System Installation

Table 2–3 (Cont.) Required Power Cables by Country
Cable
Number

Plug
Number

India

BN18H–4E
(17–00456–06)

BS546

Ireland

BN18P–4E
(17–01255–01)

IEC 309

Israel

BN18F–4E
(17–00457–06)

S.I.32

Italy

BN18E–4E
(17–00364–06)

CEI 23–16

Japan

BN18R–4E
(17–01256–01)

IEC 309

South Africa

BN18H–4E
(17–00456–06)

BS546

Switzerland

BN18P–4E
(17–01255–01)

IEC 309

United Kingdom

BN18P–4E
(17–01255–01)

IEC 309

United States

BN18R–4E
(17–01256–01)

IEC 309

Country

DECsystem 5900 System Installation 2–5

2.2 Unpacking the Shipment
The shipment can include several cartons containing:
•

The system unit

•

Cables for connecting additional devices to the system

•

Console terminal(s)

•

Kit of customer documentation

•

The container marked "Software" that contains software documentation,
system software, diagnostic software, and a software license.
Note
Save all packing materials if you plan to reship the system.

Depending on the order, the shipment can also include additional terminals,
printers, or modems.
When delivered, the system is packed in a cardboard container attached to a
shipping skid or pallet.
Before unpacking the equipment, check for external shipping damage. Report any
damage to the customer’s sales representative and contact the customer’s delivery
agent. Keep all packing material and receipts when filing a damage claim.
Unpack the system according to the instructions on the system shipping carton.
When you unpack the cartons, check the contents against the shipping list to
ensure the order is complete.

2.2.1 Removing the Skid
Remove the plastic wrap, the corner pads, and any cardboard packaging.
WARNING
Use two people to move the system; the system weighs between
265 and 485 kg (480 and 1070 lb), depending on the options
installed.
To remove the system from the skid, follow these steps:
1. Leave a 7-ft clearance in front of the skid.

2–6 DECsystem 5900 System Installation

2. Insert the skid ramps into the holes in the front of the skid with the arrows
on the skid lined up with the arrows on the ramp.
3. With a 9/16-inch wrench, loosen and remove the wheel lock bolts
system’s feet (see Figure 2–2).

on the

4. Remove the wheel locks and save them for use if the system ever needs to be
shipped.
5. Roll the system down the ramps into the proper position. The front two
wheels are casters, the rear wheels are fixed.
6. Slide the system into the desired location.
Figure 2–2 Wheel Lock Removal

MLO-007680

Wheel lock bolt(s)

Wheel lock

DECsystem 5900 System Installation 2–7

2.2.2 Leveling the System
After the system is in place, use an adjustable wrench to lower the leveler feet
(one at each of the four corners) to assume the weight of the system, and lock the
feet by tightening the lock nut up to the system (see Figure 2–3).
Figure 2–3 Leveling the System

2
1

MLO-007745

Leveler foot

Lock nut

2.2.3 Assembling the System Skirts
The skirts are installed after the system has been set in place and leveled as
explained in Section 2.2.2. The skirt kit is in a separate box from the accessory
kit.
2.2.3.1 Front Skirt
The front skirt consists of three pieces which must be assembled and then
attached to the front of the system; a center skirt and a left and right corner
skirt, part numbers 74–41733–01, 74–41659–01, and 74–41659–02, respectively
(see Figure 2–4).

2–8 DECsystem 5900 System Installation

2.2.3.2 Side Skirts
The side skirts each have two parts—a long skirt (74–1653–01) and an ‘‘ear’’ (74–
41655–01) which is attached to the long skirt with three self-tapping Phillips
screws. Each of these assemblies is then attached to the system with two
quarter-turn Phillips captive screws.
Figure 2–4 Front and Side Skirts

MLO-007683

Left and right corner skirts

Center skirt

Long skirt
Ear

DECsystem 5900 System Installation 2–9

2.2.3.3 Rear Skirts
The rear skirt has a rectangular opening through which all external power and
signal cables must be run. The rear skirt parts are assembled and attached
to the frame with push-in captive screws (see Figure 2–5). The cable cover
(74–41660–01) is then fit into the notches on the rear skirt. Attach the lower rear
skirt panel with four screws (see Figure 2–6).
Figure 2–5 Rear Skirt

2
3

MLO-007684

Left rear corner
Cable cover

Right rear corner
Push-in captive screw

2–10 DECsystem 5900 System Installation

Figure 2–6 Attaching the Lower Rear Skirt Panel

MLO-008361

Hex screw

DECsystem 5900 System Installation 2–11

2.2.4 Opening the Doors
The enclosure doors are accessed with a 1/4-inch hex wrench (see Figure 2–7 and
Figure 2–8).
Figure 2–7 Opening the Front Enclosure Door

MLO-007705

Front door
Latches

Hex wrench

2–12 DECsystem 5900 System Installation

Figure 2–8 Opening the Rear Enclosure Door

1
2

MLO-007744

Rear door
Latches

Hex wrench

2.2.5 Removing Mass Storage Drawer 1 Shipping Brackets
Mass storage drawers in a DECsystem 5900 system are fixed to the enclosure
for shipment by rear retainer brackets. To access a mass storage drawer, you
must first detach it from the retainers. This procedure is repeated for each mass
storage drawer in the DECsystem 5900 system.
1. Loosen the two slotted captive screws holding the lower rear plate of the
drawer (see Figure 2–9), and remove the plate.
2. Loosen and remove the two hex slotted bracket screws on each inside wall.
Figure 2–10 shows the rear plate removed and the four bracket screws.

DECsystem 5900 System Installation 2–13

You may leave the retainer brackets in place on the cabinet, or detach them
for ease of service by removing the four screws on each. (Be sure to save the
retainer brackets with the other shipping materials for possible relocation or
shipment of the DECsystem 5900 system.)
3. Place the hex slotted bracket screws with the rest of materials in the
Accessory Kit to be retained on site.
Figure 2–9 Mass Storage Drawer Lower Plate

1
MLO-007747

Slotted captive screws

2–14 DECsystem 5900 System Installation

Figure 2–10 Mass Storage Drawer Bracket Screws

1
2

2
MLO-007688

Retainer bracket

Hex slotted bracket screws

2.2.6 Removing Mass Storage Drawer 2 Shipping Brackets
The mass storage drawer 2 is also fixed to the enclosure for shipment by rear
restraint brackets. To access a mass storage drawer 2, you must first detach the
retainers (see Figure 2–11).
This procedure is repeated for each mass storage drawer in the DECsystem 5900
system.
1. Remove the four bracket hex screws holding each retainer bracket to the rear
cabinet rails.
2. Loosen and remove the two hex nuts holding each retainer to the side of the
drawer.
3. Place the bracket hex screws, hex nuts, and retainer brackets in the
Accessory Kit to be retained on site for possible relocation or shipment of
the DECsystem 5900 system.

DECsystem 5900 System Installation 2–15

Figure 2–11 Mass Storage Drawer 2 Restraint Bracket

MLO-008362

Bracket hex nuts
Bracket hex screws

Retainer bracket

2.3 Console and Network Connections, Power-Up
This section describes cable connections and how to turn on the system.

2–16 DECsystem 5900 System Installation

2.3.1 Connecting the Console Terminal and Ethernet
Connect the console terminal and Ethernet cables to the system ports shown in
Figure 2–12.
Figure 2–12 Connecting the Console Terminal and Ethernet Cables

2
MLO-007748

Ethernet port

System console port

2.3.2 Connecting the Power/Turning the System On and Off
Turn on the DECsystem 5900 system in the following sequence:
1. Plug in the power cable to the ac source.
2. Turn on the power controller (see Section 2.3.2.1).
3. Turn on the CPU drawer (see Section 2.3.2.2).
4. Turn on the mass storage drawers one at a time (see Section 2.3.2.3).
5. Reverse these procedures to turn the system off.
The power controller will turn the system on or off if the remote/local switch is in
the remote position.

DECsystem 5900 System Installation 2–17

Note
Most U.S. installations have the power cable as part of the power
controller. Other installations may have unique detachable cables with
the appropriate plug (see Table 2–3).

2.3.2.1 Turning On the Power Controller
Turn on the power controller by setting the remote/local toggle switch to remote,
and the main circuit breaker to on (see Figure 2–13). If the remote/local switch
is in the local mode (down), the drawers must be turned on individually and
manually.
Figure 2–13 Turning On the Power Controller
1

5
MLO-007689

Cable to CPU drawer system switch
Remote/local toggle switch (up is remote)

LED indicator

Circuit breaker (up is on)
System power cable
2.3.2.2 Turning On the CPU Drawer
A CPU drawer has two power switches on the front; the upper one is a system
power master switch for all drawers in the DECsystem 5900 system. The lower
switch controls power to the CPU drawer only. No power will be distributed to
the CPU drawer unless both switches are on.

2–18 DECsystem 5900 System Installation

To turn on a CPU drawer, turn on the CPU power switch and the master switch
(see Figure 2–14); to turn off the CPU drawer, reverse these procedures.
Figure 2–14 Power Switches on the Front of the CPU Drawer
1

MLO-007692

CPU drawer power switch (O/ | )

System power switch (O/ | )
2.3.2.3 Turning On a Mass Storage Drawer
Mass storage drawers have either one power switch in the rear or two power
switches (front and rear) which must be turned on for the drawer to be powered
(see Figure 2–15 and Figure 2–16 for mass storage drawer 1, and Figure 2–17
for mass storage drawer 2). Turn off the mass storage drawer using the same
switch(es).
Note
The master switch on the CPU drawer must also be ‘‘on’’ before power will
be distributed to any of the drawers.

DECsystem 5900 System Installation 2–19

Figure 2–15 Power Switch on the Front of Mass Storage Drawer 1

1
MLO-007691

Power switch—green LED indicator is on
Figure 2–16 Power Switch on the Rear of Mass Storage Drawer 1

MLO-007749

Power switch (O/ | )

2–20 DECsystem 5900 System Installation

Figure 2–17 Power Switch on the Rear of Mass Storage Drawer 2
3

2
MLO-008413

Power switch
Power cable that connects to the main power controller

SCSI bus(es) that connect to the CPU drawer and/or SCSI terminator

Power supply
Fans

DECsystem 5900 System Installation 2–21

2.4 Completing the Installation
To complete the installation, remove the blank tape, set the terminal parameters,
check the diagnostics, and run the power-up self-test.

2.4.1 Removing Blank Media
For protection during shipping, blank tape and plastic protectors are installed
in removable media devices. Remove these after the system is in place and save
them in the accessory box for use if the system needs to be reshipped.

2.4.2 Setting Console Terminal Parameters
The console terminal should be set to the following parameters:
Baud rate 9600
8 bits; no parity; 1 stop bit
Refer to the appropriate manual for detailed instructions on setting these
controls.

2.4.3 Troubleshooting and Diagnostics
Diagnostics and troubleshooting involve checking the error log and other
symptoms to resolve problems at the site.
2.4.3.1 Error Display
Errors, including power-up self-test errors, are displayed in the console error log.
2.4.3.2 Running Diagnostics
In running diagnostics, use console commands to run tests.
Enter the cnfg command to find the numbers of the modules. Enter the t /n ?
command to find out which tests are available for that particular module.

2.4.4 Power-Up Self-Tests
Caution
For proper loading and booting procedures, see the Guide to Installing
ULTRIX, AA–PBL0D–TE.
The power-up process takes about one minute from the time the system is turned
on.

2–22 DECsystem 5900 System Installation

Names of tests display on the console as they are performed. The tests also
display in hexadecimal values on the pair of four LED indicators on the rear of
the CPU drawer. There is neither a keyboard nor printer directly connected to
the CPU in the DECsystem 5900 system; these messages can be ignored.
2.4.4.1 Problems with Option Modules
The power-up self-tests do not test the drives or devices in the mass storage
drawer(s). Addresses and function of the installed devices can be verified when
running extended tests. During the sequence of tests, n3 indicates the slot
number of an option module with an error.
See the DECsystem 5900 Service Guide for extended testing of mass storage
devices and I/O options and troubleshooting procedures.
2.4.4.2 Resolving Problems
See the DECsystem 5900 Pocket Service Guide or telephone 1–800–DEC–8000 for
support.

2.5 Accessory Kit Contents
Customers should save all extra parts for future use or system upgrades.
Accessories are listed below:
User documents (EK–D590A–DK)
Guide to Installing ULTRIX
Sign kit (Ethernet/CI node)
Hex wrench to open doors
Skirt assembly for cabinet (in a separate box)
MMJ adapter from console
Ethernet loopback connector (12–22196–01) and other loopbacks
Postcard, FTZ label
External cables
Drive ID labels
Drive fasteners
Drive ID jumpers
Drive brackets and removable media device brackets (in mass storage drawer)
Drive tray trim plates

DECsystem 5900 System Installation 2–23

SCSI terminators
Drive shorting jumper
Media for tape and floppy drives
Tape and floppy drive documentation (removable media documentation)

2–24 DECsystem 5900 System Installation

3
Enclosure and CPU Drawer FRU
Removal and Replacement
This chapter describes how to remove and replace the field-replaceable units
(FRUs) in the DECsystem 5900 cabinet and CPU drawers.
The following sections describe the removal procedure for each FRU. Unless
otherwise specified, you can install a FRU by reversing the steps in the removal
procedure.
System-specific FRU procedures vary slightly due to varying configurations. As a
result, some illustrations of procedures show an example of a FRU removal. The
variations are noted in the text and in the title of the illustration.
WARNING
Turn off the system power before you remove or install FRUs (see
Section 2.3.2).

Caution
•

Only qualified service personnel should remove or install FRUs.

•

Static electricity can damage integrated circuits. Always use a
grounded wrist strap and a grounded work surface (29–26246) when
working with the internal parts of a computer system.

•

Shut down ULTRIX in an orderly fashion before you remove or install
FRUs; the FRU removal and replacement procedures in this document
assume that ULTRIX has been shut down first.

Enclosure and CPU Drawer FRU Removal and Replacement 3–1

3.1 Removing and Replacing Enclosure FRUs
This section decribes the removal and replacement of enclosure FRUs.

3.1.1 Opening the Enclosure Doors
The enclosure doors are opened with a key (12–26339–01) or with a 1/4-inch hex
wrench (see Figure 3–1 and Figure 3–2).
Figure 3–1 Opening the Front Enclosure Door

MLO-007705

Front door
Latches

Hex wrench

3–2 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–2 Opening the Rear Enclosure Door

1
2

MLO-007744

Rear door
Latches

Hex wrench

Enclosure and CPU Drawer FRU Removal and Replacement 3–3

3.1.2 Enclosure Cables
The DECsystem 5900 system is shipped from the factory complete with power
cables for a full complement of four mass storage drawers, regardless of the
number of drawers initially ordered.
Power cables are attached to the enclosure with wire ties. If it becomes necessary
to replace a cable, remove the wire ties, swap the appropriate cable, and replace
the ties.
Cables running to the CPU drawer should be routed through the cable arm for
protection.

3.1.3 Removing and Replacing Drawer Filler Panels
Slots in the DECsystem 5900 enclosure front which contain no drawers are
covered with a filler panel. Slot 0, which contains the power controller (accessed
through the rear of the H9A00 enclosure), has a filler panel as well. Filler panels
are attached by means of four 5/16-inch hex screws, two on each side. Filler
panels may be removed for easier access to adjacent drawers.

3.1.4 Removing and Replacing the Power Controller
The power controller is accessed from the rear of the H9A00 enclosure.
Follow these steps to remove the power controller (see Figure 3–3):
1. Turn off the power using the circuit breaker switch located on the power
controller.
2. Unplug the power cable at the power source and thread the plug back through
the rear skirt, so that the power controller may be removed (see following
steps).
3. Disconnect all power leads to drawers from the left-hand side of the power
controller.
4. Disconnect the power sequence cable.
5. Remove the four 5/16-inch hex screws on each corner of the power controller.
Note
Do not remove any other screws; this would disassemble the power
controller, and is unnecessary.

6. Slide the power controller forward and out of the enclosure, complete with the
power cable.

3–4 Enclosure and CPU Drawer FRU Removal and Replacement

7. To replace a power controller, reverse the steps above.
Note
Some variations of the power cable will be detachable at the power
controller, and will not be a part of the unit; in this case, unplug the
power cable at both ends instead of just at the power source, and proceed
as above. The removable power cable will be reused.

Figure 3–3 Removing the Power Controller

2
3
1
4

5
MLO-007751

Hex screws
Connectors for power sequence cable(s)

Circuit breaker

Power cable
Power controller

Enclosure and CPU Drawer FRU Removal and Replacement 3–5

3.2 Removing and Replacing CPU Drawer FRUs
This section describes the CPU drawer FRUs.
WARNING
•

Before accessing either the CPU or the mass storage drawers,
be sure that the stabilizer bar located at the bottom front
of the enclosure is extended to balance the DECsystem 5900
system (see Figure 3–5).

•

Do not pull out more than one drawer at a time.

3.2.1 Accessing the CPU Drawer
Access the CPU drawer using the following procedures.
3.2.1.1 CPU Drawer Compartments and Covers
The CPU power supply, blower, air plenum, and CPU and TURBOchannel
Extender module compartments (identified in Figure 3–4) are accessed by pulling
out the CPU drawer on its slides and opening the appropriate cover.
Three covers on the CPU drawer access the components listed in Table 3–1.
Table 3–1 CPU Drawer Covers
Cover Location

Accesses:

Front

Blower and CPU power supply

Middle

CPU/daughter module, system module, memory, TURBOchannel
Adapter and options

Rear

TURBOchannel Extender module and options

Note
All FRU services may be performed without removing the CPU drawer
from the cabinet.

3–6 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–4 CPU Drawer Compartments and Covers
1

8
MLO-007707

Blower compartment
Front top cover

Middle top cover

Air plenum compartment

TURBOchannel Extender compartment
Rear top cover

Power supply compartment
CPU compartment

Enclosure and CPU Drawer FRU Removal and Replacement 3–7

3.2.1.2 Stabilizing the Enclosure
WARNING
Before accessing either the CPU or the mass storage drawers, the
stabilizer bar located at the bottom front of the enclosure must be
extended to balance the DECsystem 5900 system (see Figure 3–5).
The DECsystem 5900 system must be balanced before accessing either the CPU
or mass storage drawers.
1. If the leveler foot is tightened down to the floor, raise it.
2. Pull the stabilizer bar out until it stops.
3. Screw the leveler foot down firmly by hand.
To retract the arm, reverse these procedures.

3–8 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–5 Stabilizing the Enclosure

1
2
MLO-007752

Stabilizer bar

Leveler
3.2.1.3 Pulling Out/Pushing In the Drawer
The CPU drawer is accessed by removing the six hex screws on the front of the
drawer with either a screwdriver or a 5/16-inch wrench.
To pull out the CPU drawer, grasp both sides of the drawer’s front edge and
slide the entire drawer forward from the enclosure until a click is heard. This
means that the latches on either of the drawer’s slides have sprung out slightly
to engage. Check to see that both latches are engaged; if not, pull the drawer
out carefully until the remaining one engages, and the middle cover on the top
of the drawer (air plenum compartment, Figure 1–8) can be latched in a vertical
position (see Figure 3–6).
To push in the CPU drawer, hold the spring tabs in (they should be protruding
through the holes) while gently sliding the drawer, and reverse the procedure as
depicted in Figure 3–7.
Enclosure and CPU Drawer FRU Removal and Replacement 3–9

As the CPU drawer is pushed or pulled, the cable arm extends or retracts,
keeping the cables organized and out of the way.
Figure 3–6 Pulling Out the CPU Drawer

MLO-007753

3–10 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–7 Pushing In the CPU Drawer

1
0

MLO-007754

Spring tab in hole

Enclosure and CPU Drawer FRU Removal and Replacement 3–11

3.2.1.4 Opening/Removing the CPU Drawer Front Top Cover
Open the CPU drawer front top cover (over the blower compartment) by
following the steps below. The blower is attached to the bottom of the cover
(see Figure 3–8).
1. Loosen the two quarter-turn captive screws along the top edge of the top front
cover with a Phillips screwdriver, and lift the front edge of the cover.
2. Unplug the keyed blower power connector from the power supply.
3. Remove the cover (with blower attached) by sliding it forward and up.
4. To close the cover, reverse the above procedures.

3–12 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–8 Opening the CPU Drawer Front Top Cover

1
3
4

MLO-007755

Front top cover
Screws

Blower
Keyed blower power connector

Enclosure and CPU Drawer FRU Removal and Replacement 3–13

3.2.1.5 Opening the CPU Drawer Middle Top Cover
To open the middle top cover of the CPU drawer (air plenum compartment), pull
out the CPU drawer as described in Section 3.2.1. Lifting up the middle top cover
will also lift the TURBOchannel Extender compartment (see Section 1.1.2.3.)
1. Using a slotted screwdriver, loosen the two captive screws along the middle
edge of the top cover of the drawer (Figure 3–9).
2. Lift up the middle top cover (air plenum compartment) by grasping the handle
on the top and lifting it up and back into an upright position.
3. Slide the latch to the right to hold the cover in place (see Figure 3–10).
4. To close the cover, reverse the above procedures.

3–14 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–9 Opening the Middle Top Cover Upright

1
2

MLO-009768

Middle top cover

Screws

Enclosure and CPU Drawer FRU Removal and Replacement 3–15

Figure 3–10 Latching the Middle Top Cover Upright

MLO-009769

Latch
WARNING
Be sure the middle top cover (air plenum compartment) is latched
in an upright position before proceeding.

3–16 Enclosure and CPU Drawer FRU Removal and Replacement

3.2.1.6 Opening the CPU Drawer Rear Top Cover
Open the CPU drawer rear top cover (over the TURBOchannel Extender
compartment) by following the steps below (see Figure 3–11).
1. Use a Phillips screwdriver to loosen the two quarter-turn captive screws along
the top edge of the rear cover of the drawer
2. Remove the cover by sliding it out to the rear.
3. To close the cover, reverse the above procedures.
Figure 3–11 Opening the CPU Drawer Rear Top Cover

MLO-007758

Rear top cover

Screws

Enclosure and CPU Drawer FRU Removal and Replacement 3–17

3.2.2 Removing and Replacing the CPU Blower
To remove or replace the CPU blower, follow the procedures below.
Figure 3–12 illustrates removal of the CPU blower.
1. Turn off the power to the CPU drawer (using the lower switch on the front of
the drawer).
2. Pull out the CPU drawer as described in Section 3.2.1.
3. Remove the CPU drawer front top cover and unplug the keyed blower power
connector (see Section 3.2.1.4). The blower is attached to the bottom of the
cover.
4. Note which way the power cable faces (to ensure correct installation of the
new blower with the cable facing the power supply).
5. Remove the blower from the cover by loosening the four 11/32-inch nuts, and
lifting it off the four posts.
6. Disconnect the mounting bracket from the blower by removing the four
Phillips screws which attach it to the blower.
7. To replace the blower, attach it to the mounting bracket, fit the bracket onto
the four posts, and reverse the above procedures.

3–18 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–12 Removing the CPU Drawer Blower

4
5

2
1
MLO-007759

CPU drawer switch
Quarter turn captive screws

Blower power cable

Front top cover
Mounting bracket and screws

Enclosure and CPU Drawer FRU Removal and Replacement 3–19

3.2.3 Removing and Replacing the CPU Power Supply
To remove or replace the CPU power supply, follow the steps below.
Note
There are no field serviceable parts in the power supply.

The CPU power supply is accessed by removing the front top cover of the CPU
drawer and the front panel of the drawer (see Figure 3–13).
1. Turn off the power to the CPU drawer (using the lower switch on the front of
the drawer).
2. Pull out the CPU drawer as described in Section 3.2.1.
3. Remove the CPU drawer front top cover and unplug the keyed power
connector (see Section 3.2.1.4). The blower is attached to the bottom of the
cover.
4. Unplug the ac power supply on the top right-hand side of the power supply.
5. Remove the front panel of the drawer using a Phillips screwdriver on the four
screws.
6. Remove the two Phillips screws which hold the blower panel in place.
7. Disconnect the power cables from the power supply at the power distribution
module; note the location of the red and black cables.
8. Pull the power supply forward and up to remove it.
9. To replace the power supply, reverse the above procedures.

3–20 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–13 Removing the CPU Drawer Power Supply

5
1
MLO-007760

CPU drawer switch
AC power cord

Power cables to power distribution module
Power supply

Phillips screws

Enclosure and CPU Drawer FRU Removal and Replacement 3–21

3.2.4 Removing and Replacing the Power Distribution Module
To access the module, raise the front top and middle top covers of the CPU drawer
(see Section 3.2.1.4 and Section 3.2.1.5). It is not necessary to remove the front of
the CPU drawer unless you wish to access the power supply as well.
To remove or replace the power distribution module, follow the procedures below.
1. Turn off the power to the CPU drawer (using the lower switch on the front of
the drawer).
2. Pull out the CPU drawer as described in Section 3.2.1.
3. Remove the CPU drawer top front cover and unplug the keyed power
connector (see Section 3.2.1.4). The blower is attached to the bottom of the
cover.
4. Remove the front panel of the drawer using a Phillips screwdriver on the four
screws.
5. Remove the two Phillips screws which hold the blower panel in place.
6. Locate the power distribution module (Figure 3–14).
7. Disconnect the cables from the power supply to the power distribution
module. See Figure 3–13, . (It is not necessary to remove the entire power
supply.)
8. Open the middle top cover of the CPU drawer (air plenum compartment), to
expose the CPU compartment (see Section 3.2.1.5).
9. In the CPU compartment, disconnect the cables from the power distribution
module to the system module; note the position of the red and black cables
(Figure 3–15).
10. Disconnect the keyed connector to the system module at the rear of the power
distribution module (Figure 3–15).
11. Disconnect all cables from the power distribution module which run to the
TURBOchannel Extender compartment; they are bundled together on the side
of the drawer (Figure 3–16).

3–22 Enclosure and CPU Drawer FRU Removal and Replacement

12. Gently pry the power distribution module forward from the retaining posts
and thread the red and black cables through the compartment separator
(Figure 3–17).
13. Replace the power distribution module by reversing the above procedures.
Figure 3–14 Locating the Power Distribution Module

MLO-009770

Power distribution module

Enclosure and CPU Drawer FRU Removal and Replacement 3–23

Figure 3–15 Disconnecting the Power Distribution Module from the System
Module
1

MLO-009772

Red cable
Ground (black cable)

Keyed system module connector

3–24 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–16 Disconnecting the Power Distribution Module from the
TURBOchannel Extender Module
1

MLO-009771

Keyed TURBOchannel Extender module connector

Enclosure and CPU Drawer FRU Removal and Replacement 3–25

Figure 3–17 Removing the Power Distribution Module
1

MLO-009774

Power distribution module

3–26 Enclosure and CPU Drawer FRU Removal and Replacement

3.2.5 Accessing the CPU Compartment
To remove, replace, or service components in the CPU compartment, turn off the
lower power switch on the front of the CPU drawer. Pull out the CPU drawer as
described in Section 3.2.1 and raise the middle cover (air plenum compartment)
(see Section 3.2.1.5).
WARNING
Be sure the middle top cover (air plenum compartment) is latched
in an upright position before proceeding.

3.2.6 Removing and Replacing the CPU/Daughter Card
The CPU card is mounted to the system module via a connector and four plastic
mounting posts (standoffs). The standoffs have small tabs that lock onto the
CPU card. A standoff tool is included in CPU upgrade kits to remove the
CPU/daughter card from the standoffs. Handle the card by the edges, not by the
heat sinks.
3.2.6.1 Removing the CPU/Daughter Card
Remove the CPU/daughter card as follows (see Figure 3–18):
1. Use the standoff tool (12–46254–01) to press the tabs on a standoff. Gently
pull up on the edge of the CPU card nearest that post.
2. Repeat for the remaining three standoffs.
3. When the CPU card is free of the standoffs, grip it by the edges of the card
near both ends of the connector located underneath, and gently rock it free of
the connector.

Enclosure and CPU Drawer FRU Removal and Replacement 3–27

Figure 3–18 Removing the CPU/Daughter Card

MLO-009777

Standoff tool

Standoff

3–28 Enclosure and CPU Drawer FRU Removal and Replacement

3.2.6.2 Installing the CPU/Daughter Card
Replace the CPU/daughter card as follows (see Figure 3–19):
1. Position the CPU card so that its connector is aligned over the CPU card
connector on the base system module. Align the four holes in the CPU card
over the four mounting posts (standoffs).
2. Gently apply even pressure on the edges of the CPU card so that the
connector and standoffs seat firmly.
Figure 3–19 Installing the CPU/Daughter Card

MLO-009764

CPU/daughter card

Standoff

Enclosure and CPU Drawer FRU Removal and Replacement 3–29

3.2.7 Memory Options
There are two memory options which may be located in the CPU drawer:
•

MS02–CA (up to 14 modules; two modules are standard)

•

NVRAM (one module; in slot 14 only)

Both are located in the CPU compartment itself; to access them, pull out the CPU
drawer as described in Section 3.2.1 and raise the air plenum compartment (see
Section 3.2.1.5).
3.2.7.1 MS02–CA
The MS02–CA memory is sequentially located in memory slots marked 0–13,
starting with slot 0.
To remove an MS02–CA module, grasp it on each end and gently pull up on each
end (see Figure 3–20). The module connectors are ‘‘keyed’’ to fit only the correct
way.
Figure 3–20 Removing the MS02–CA Memory Module
1

MLO-009775

MS02–CA memory modules (two standard; optional up to fourteen)

3–30 Enclosure and CPU Drawer FRU Removal and Replacement

3.2.7.2 MS02–NV
The 1-Mbyte NVRAM array (MS02–NV) is always to be located in memory slot
14. This slot may only be used for the NVRAM module.
To remove the MS02–NV module, grasp it on each end and gently pull up on each
end (see Figure 3–21). The module connectors are ‘‘keyed’’ to fit only the correct
way.
Figure 3–21 Removing the MS02–NV Module

1
MLO-009776

MS02–NV (NVRAM) module

Enclosure and CPU Drawer FRU Removal and Replacement 3–31

3.2.8 Removing and Replacing the TURBOchannel Options
Note
The following procedures apply to the removal and replacement of all
TURBOchannel slot options, including (but not limited to):
•

TURBOchannel Extender Adapter

•

PMAD

•

PMAZ

•

DEFZA

•

VME

•

DEC WANcontroller 720

•

CITCA

The procedures for removal and replacement of TURBOchannel options is the
same whether they are located on the system module or on the TURBOchannel
Extender.
Some TURBOchannel options occupy more than one slot. They are connected to
each of the slots in essentially the same manner as the single-slot TURBOchannel
options; that is, as if they were two single-slot options or one triple-slot option,
and are removed accordingly. An illustration of each is provided for identification.
To remove a TURBOchannel option:
1. Disconnect the signal bus through the rear of the CPU compartment to the
drawer or device.
2. From the outside of the drawer, remove the Phillips screws (two for each slot
the option occupies) holding the module to the rear of the drawer.
3. Remove the Phillips screws (two for each slot the option occupies) which point
downward through the module into the mounting posts on the system module.
4. Gently pry the module up from its connector(s) and retaining posts.
Figure 3–22 depicts a typical one-slot TURBOchannel option (the TURBOchannel
Extender Adapter) being removed from the system module; two- and three-slot
options would be removed in the same manner. Outlines of the various options
are depicted in Section 3.2.8.1.

3–32 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–22 Removing a TURBOchannel Option

MLO-007765

Enclosure and CPU Drawer FRU Removal and Replacement 3–33

3.2.8.1 Illustrations of Typical TURBOchannel Options
Figure 3–23 depicts the shape of typical one-slot TURBOchannel options and
screw fasteners, such as PMAD, PMAZ, DEFZA, and VME modules.
Figure 3–23 PMAD TURBOchannel Option

SAMPLE-BOARD

MLO-008363

3–34 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–24 depicts the shape of a DEC WANcontroller 720 and its screw
fasteners. The DEC WANcontroller is a one-slot option which contains two
modules.
Figure 3–24 DEC WANcontroller 720 TURBOchannel Option

SAMPLE-BOARD

MLO-008369

Enclosure and CPU Drawer FRU Removal and Replacement 3–35

Figure 3–25 depicts the shape of a three-slot option such as CITCA, and its screw
fasteners.
Figure 3–25 CITCA TURBOchannel Option

MLO-008366

3.2.9 System Module
In order to remove the system module, it is first necessary to remove the
CPU/daughter card and any TURBOchannel or memory option modules or blank
panels which are part of the configuration. For instructions on the removal of
the CPU/daughter card and options, refer to the applicable section indicated in
Table 3–2.
Table 3–2 CPU Compartment Modules and Location in This Manual
Module

Section

System module

Section 3.2.9

CPU/daughter card

Section 3.2.6

MS02–CA module(s)

Section 3.2.7.1

MS02–NV module

Section 3.2.7.2

TURBOchannel options

Section 3.2.8

Blank panels

Section 3.2.9.3

3–36 Enclosure and CPU Drawer FRU Removal and Replacement

3.2.9.1 Removing and Replacing the Stiffener for Shipping the System Module
The DECsystem 5900 system module spare is shipped in a protective metal
‘‘stiffener’’ which is removed prior to installation. The replaced system module is
returned to the repair center for credit after being installed in the stiffener for
protection during shipment.
The stiffener is used as a chassis in another system. Remove all screws and
carefully pry the module up from the standoff posts. Take care not to damage
the metal gasket. Figure 3–26 depicts the system module as it is shipped in the
stiffener.
Figure 3–26 System Module in the Stiffener
3

MLO-007768

Standoff post
Screw

Metal gasket

Enclosure and CPU Drawer FRU Removal and Replacement 3–37

3.2.9.2 Removing and Replacing the System Module
To remove and replace the system module, follow the procedures below. See
Figure 3–27.
1. Disconnect all signal and power leads to and from the CPU compartment and
options and note their position for installation of the new module.
2. Remove the CPU/daughter card (see Section 3.2.6).
3. Remove the MS02–CA module(s) (see Section 3.2.7 and Section 3.2.7.1).
4. Remove the NVRAM module (see Section 3.2.7 and Section 3.2.7.2).
5. Remove other TURBOchannel options (see Section 3.2.8).
6. Remove the blank panels where no TURBOchannel options are present (see
Section 3.2.9.3).
7. Remove the 3/16-inch screws and standoffs holding down the system module.
8. Gently remove the module by sliding forward and up.
9. Remove the new system module from the stiffener in which it is shipped (see
Section 3.2.9.1).
10. To install the new system module, complete the steps below, then reverse the
above procedures.
a. Using standard chip swapping procedures, swap the Ethernet Station
address ROM (ESAR) DIP chip from the old module (located under
TURBOchannel slot 1 toward the rear) and place it on the new module in
the exact same position.
b. Remove the system ID jumper (if it is installed), located in the
TURBOchannel option slot 0 area. The system ID jumper is always
out for the DECsystem 5900 system.
c.

Place the old system module in the stiffener for shipment to the repair
center (see Section 3.2.9.1.) To avoid damage to the old system module,
reuse all the hardware which held the replacement in the stiffener.

3–38 Enclosure and CPU Drawer FRU Removal and Replacement

Figure 3–27 Removing the System Module
4
3

MLO-007766

Standoffs
Screws

Cables

ESAR chip
System ID jumper

Enclosure and CPU Drawer FRU Removal and Replacement 3–39

3.2.9.3 CPU Compartment Blank Panels
If any of the three TURBOchannel option openings in the rear of the CPU
compartment is not in use, there will be a blank panel covering the opening(s).
It is necessary to remove the blank panel(s), since they hold the FCC-compliant
shield in place. The shield is an integral part of the system module, and is
removed with it (see Figure 3–28).
Figure 3–28 Removing CPU Compartment Blank Panels

MLO-007767

Blank panel

Screws

3–40 Enclosure and CPU Drawer FRU Removal and Replacement

3.2.10 Removing and Replacing the TURBOchannel Extender
Module
To service the TURBOchannel Extender module, pull out the CPU drawer
as described in Section 3.2.1 and open the rear top cover of the drawer
(Section 3.2.1.6).
Figure 3–29 illustrates removal of the TURBOchannel Extender module.
1. Turn off the power to the CPU drawer (using the lower switch on the front of
the drawer).
2. Pull out the CPU drawer (see Section 3.2.1).
3. Remove the CPU drawer rear top cover (see Section 3.2.1.6).
4. Disconnect the signal leads to TURBOchannel devices through the rear of the
TURBOchannel Extender compartment to drawers or devices.
5. Disconnect the 18-inch cables connecting the TURBOchannel adapter and the
TURBOchannel Extender.
6. Remove any option modules attached to the TURBOchannel Extender.
(Options are removed in the same manner as options on the system module;
see Section 3.2.8.)
Note
To remove the TURBOchannel Extender module, it is not necessary
to remove any blank panels from the TURBOchannel Extender module
compartment. (It is necessary to remove them from the CPU compartment
when removing the system module.)
7. Remove the power connector.
8. Remove the six hex standoffs which attach to the TURBOchannel options.
9. Remove the two screws along the rear of the TURBOchannel Extender
module.
10. Slide the module toward the front of the drawer and off the three permanent
hold-down slot posts along the rear of the module.
11. To replace the TURBOchannel Extender module, reverse the procedures
above.

Enclosure and CPU Drawer FRU Removal and Replacement 3–41

Figure 3–29 Removing the TURBOchannel Extender Module
1
Rear View

3
1

6
MLO-007769

Signal lead to SCSI device(s)
System module bus to TURBOchannel Extender

Sample TURBOchannel option module (may be up to three)

Power connector

Standoffs
Screws
TURBOchannel Extender module

3–42 Enclosure and CPU Drawer FRU Removal and Replacement

3.3 Removing and Replacing the Entire CPU
Drawer/CPU Drawer Upgrade
Use the following procedures to remove and replace an entire CPU drawer.

3.3.1 Balancing the System
WARNING
Before installing or pulling out either the CPU or a mass storage
drawer, the stabilizer bar located at the bottom front of the
enclosure must be extended to balance the DECsystem 5900
system.
Balance the system by extending the stabilizer bar located at the bottom front, as
depicted in Figure 3–30.
1. If the leveler foot is tightened down to the floor, raise it.
2. Pull the stabilizer bar out until it stops.
3. Screw the leveler foot down firmly by hand.
4. To retract the arm, reverse these procedures.

Enclosure and CPU Drawer FRU Removal and Replacement 3–43

Figure 3–30 Stabilizing the Enclosure

1
2
MLO-007752

Stabilizer bar

Leveler foot
WARNING
The CPU drawer weighs 65 pounds when fully populated. At least
two people are required to remove or replace a drawer in the
DECsystem 5900 system.
Use the following procedures to remove and replace a CPU drawer (see
Figure 3–31). To install the slides the CPU drawer rides on, see Section 3.3.3.2.
1. Clear a workspace for the unattached drawer.
2. Turn off the power to the CPU drawer (using the lower switch on the front of
the drawer).

3–44 Enclosure and CPU Drawer FRU Removal and Replacement

3. Unplug all cables and buses from the back of the drawer (they will be
threaded through the cable arm); take note of where each is attached for
future reference. (If you must also remove the cable arm, see Section 3.3.2).
4. Pull out the CPU drawer as described in Section 3.2.1.3.
5. Push in (toward the drawer) on the round tabs which prevent accidental
removal of the drawer.
6. While holding the tabs in, carefully pull the drawer out past the point where
the tabs engage.
WARNING
The drawer is now free to move past the ends of the slide.
7. With the help of another, pull the drawer all the way out to the end of the
slides to the point where you are bearing the full weight of the drawer
manually (pull it straight forward off the slides), and place it on the
workspace.
8. Push in the tabs on the drawer slides and move them back into the cabinet
for safety.
9. When you are ready to replace the drawer, pull out the slides until they latch
open, and reverse the above procedures (see Section 3.2.1.3).

Enclosure and CPU Drawer FRU Removal and Replacement 3–45

Figure 3–31 Removing the CPU Drawer

MLO-007770

Spring tab in hole

3–46 Enclosure and CPU Drawer FRU Removal and Replacement

3.3.2 Removing the Cable Arm
Use the following procedure to remove the cable arm (accessed through the rear
door of the DECsystem 5900 system). If possible, leave the cables tie-wrapped to
the arm for remounting. (If this is not possible, note how they are wrapped before
removing them.)
Figure 3–32 shows the cable arm without the tie-wrapped cables for clarity.
1. Leaving the cable arm attached to the bracket, remove the bracket from the
rail. This is accomplished by removing only the hex screws which attach to
the cabinet rails. (The bracket and cables are still attached to the arm.)
2. Remove the U-nuts from the rail to use in remounting the cable arm bracket.
3. To replace the cable arm, reverse these steps.
Figure 3–32 Removing the Cable Arm
1

4
MLO-008407

U-nuts
Bracket

Hex screws
Cable arm

Enclosure and CPU Drawer FRU Removal and Replacement 3–47

3.3.3 Removing the CPU Drawer Slides
Remove the CPU drawer slides from the cabinet by loosening the hex screws and
four-holed fasteners which attach the front flange and the rear bracket of the
slide to the front and rear cabinet rails, respectively. These are illustrated in
Figure 3–33 and Figure 3–34, which depict the assembly and installation of the
slides.
3.3.3.1 CPU Drawer Location
The placement of the drawers may be determined by counting the holes in the
cabinet rails, beginning on the top and counting down. The location of drawers is
described in Table 3–3.
Table 3–3 Drawer Locations on the Cabinet Rails
Cabinet
Slot

Typical Application

Hole Numbers (from the Top)

Mass storage

5–8

Mass storage

20–23

Mass storage

35–38

CPU

50–53

CPU

65–68

Mass storage

80–83

Power controller

N.A.

3.3.3.2 Slide Assembly
Assemble and attach the slides to the cabinet in the appropriate location using
the following procedures (see Figure 3–33 and Figure 3–34). For the numbering
of cabinet rail holes, see Table 3–3.
1. Place the screws and four-holed fasteners loosely on both the front and rear
cabinet rails (see Figure 3–33 and Figure 3–34). Do not tighten the screws
until the slide is mounted in the following steps.
2. Place the rear bracket on the rear cabinet rail using the screws and fourholed threaded fastener (see Figure 3–33). Do not tighten the screws until
you complete the following steps.
3. Loosely attach the front flange of the slide to the screws and four-holed
threaded fastener (see Figure 3–34).

3–48 Enclosure and CPU Drawer FRU Removal and Replacement

4. Place the rear of the slide in the rear bracket, adjust to the exact length of the
cabinet, and loosely attach using screws and a four-holed threaded fastener
(Figure 3–33).
5. Seat the front flange of the slide and the rear bracket (now attached to the
slide) firmly and squarely against the cabinet rails and tighten them to the
cabinet with the screws and fasteners already in place.
6. Tighten the rear of the slide to the bracket.
7. Repeat these steps for the other slide.
Figure 3–33 Attaching the Rear Bracket and Slides to the Cabinet
Rear

MLO-008343

Four-holed threaded fastener
Hex screws

Hex screws
Slide

Rear slide bracket

Enclosure and CPU Drawer FRU Removal and Replacement 3–49

Figure 3–34 Attaching the Front of the CPU Slides to the Cabinet
2

Front

MLO-008408

Hex screws
Four-holed threaded fastener

Front flange of slide

3–50 Enclosure and CPU Drawer FRU Removal and Replacement

3.3.4 Balancing the System
WARNING
Before installing or pulling out either the CPU or a mass storage
drawer, the stabilizer bar located at the bottom front of the
enclosure must be extended to balance the DECsystem 5900
system.

3.3.5 Installing the Drawer in the Cabinet
To install the drawer in the cabinet, use the following procedures:
1. Pull the slides (now installed in the cabinet) out until they are fully extended.
A ‘‘click’’ will be heard when the outer slide button tabs have latched (see
Figure 3–35).
2. Using two people, lift the CPU drawer up and insert the inner slides (attached
to the drawer) into the extended slides. Push in until firm pressure is felt,
indicating that the button tab on the inner slide (attached to the CPU drawer)
is tight against the end of the middle slide.
3. Push in on each of the inner slide button tabs, and continue to push in on
the drawer until the button tabs on the inner drawer ‘‘click’’ outward through
the holes in the middle drawer slide, indicating that the drawer is securely
fastened in its extended position.

Enclosure and CPU Drawer FRU Removal and Replacement 3–51

Figure 3–35 Installing the CPU Drawer

3
MLO-008346

Middle slide section
CPU drawer

Inner slide

Inner slide button tab
Middle slide holes

3–52 Enclosure and CPU Drawer FRU Removal and Replacement

3.3.6 Pushing In the Drawer
To push in the CPU drawer, see Section 3.2.1.3.

3.3.7 Connecting the Drawer
Consult with the customer/system manager to determine the configuration
desired. If you are replacing a CPU drawer without modification of the system
configuration, all cables and buses are connected as they were previously.
If changes are to be made (options added, connected to different TURBOchannel
ports and so on) refer to Figure 1–7, which identifies all ports on the rear of the
CPU drawer, and connect them as desired.

3.3.8 Installing a Dual (Second) CPU Drawer
Refer to the DECsystem 5900 Dual CPU Drawer Installation Manual,
EK–DECDU–IN. A01 for information on installation of the dual CPU drawer
upgrade.

Enclosure and CPU Drawer FRU Removal and Replacement 3–53

4
Mass Storage FRU Removal and
Replacement
This chapter describes how to remove and replace the storage device
field-replaceable units (FRUs) in the DECsystem 5900 system.
The following sections describe the removal procedure for each FRU. Unless
otherwise specified, you can install a FRU by reversing the steps in the removal
procedure.
System-specific FRU procedures vary slightly due to varying configurations. As a
result, some illustrations of procedures show an example of a FRU removal. The
variations are noted in the text and in the title of the illustration.
WARNING
Turn off the system power before you remove or install FRUs (see
Section 2.3.2).

Caution
•

Only qualified service personnel should remove or install FRUs.

•

Static electricity can damage integrated circuits. Always use a
grounded wrist strap and a grounded work surface (29–26246) when
working with the internal parts of a computer system.

•

Shut down ULTRIX in an orderly fashion before you remove or install
FRUs; the FRU removal and replacement procedures in this document
assume that ULTRIX has been shut down first.

Mass Storage FRU Removal and Replacement 4–1

4.1 Accessing the Enclosure and Mass Storage Drawers
The enclosure doors are opened with a 1/4-inch hex wrench (see Figure 3–1 and
Figure 3–2).

4.1.1 Enclosure Cables
The DECsystem 5900 system is shipped from the factory complete with power
cables for a full complement of four mass storage drawers, regardless of the
number of drawers initially ordered.
Power and SCSI cables are attached to the HA900 enclosure with wire ties. If it
becomes necessary to replace a cable, remove the wire ties, swap the appropriate
cable, and replace the ties.

4.1.2 Removing and Replacing Drawer Filler Panels
Slots in the DECsystem 5900 enclosure front that contain no drawers will be
covered with a filler panel. Slot 0, which contains the power controller (accessed
through the rear of the enclosure), has a filler panel as well.
Filler panels are attached to the front cabinet rails by means of four hex screws,
two on each side. Remove the filler panels for slots being filled by inserting
a screwdriver through the access holes and removing the hex screws (see
Figure 4–1). Save the panel for future use by storing it in the accessory kit.

4–2 Mass Storage FRU Removal and Replacement

Figure 4–1 Removing Filler Panel(s)

MLO-008350

Filler panel

Hex screw

Mass Storage FRU Removal and Replacement 4–3

4.2 Pulling Out/Pushing In a Mass Storage Drawer
WARNING
•

Before accessing either the mass storage drawers or the CPU
drawer, the stabilizer bar located at the bottom front of the
enclosure must be extended to balance the DECsystem 5900
system (see Section 3.2.1.2).

•

Do not pull out more than one drawer at a time.

All mass storage devices and power supplies can be serviced without removing
a mass storage drawer from the cabinet. A step ladder or stool is required to
service the upper drawers in a DECsystem 5900 system.
There are two versions of mass storage drawers; they are accessed and pulled out
in much the same manner, but are opened differently. Illustrations in this section
depict accessing and pulling out a typical mass storage drawer; the one you are
working on may differ slightly.
When you are ready to open the top cover of the drawer, you will need to identify
which version you have, and locate the specific instructions for opening that
version. For a description of each version of the mass storage drawer and where
to locate the information, see Section 4.3 and Table 4–1.
Note
Some mass storage drawers in a DECsystem 5900 system are fixed to
the enclosure for shipment by rear retainer brackets which are removed
during installation. If they are still in place, see Section 2.2.5 before
proceeding.

4.2.1 Removing the Hex Screws
To pull out a mass storage drawer, remove the six hex screws on the front of the
drawer with either a screwdriver or a 5/16-inch wrench (Figure 4–2 shows the
location on a typical drawer).

4–4 Mass Storage FRU Removal and Replacement

Figure 4–2 Removing Drawer Front Hex Screws
1

MLO-007666

5/16-inch hex screws

4.2.2 Sliding the Drawer In and Out
Grasp both sides of the drawer’s front edge and slide the entire drawer forward
from the enclosure until a ‘‘click’’ is heard. This means that the spring mechanism
on either of the drawer’s slides has sprung out slightly to engage and lock the
drawer in position. Check to see that both sides are engaged; if not, pull the
drawer out carefully until the remaining one engages (Figure 4–3).
Some mass storage drawers have a catch (highlighted in Figure 4–3) which
must be pushed up to move the drawer out to the point at which the spring tabs
engage.
To push in a mass storage drawer, reverse the procedure (see Figure 4–4).

Mass Storage FRU Removal and Replacement 4–5

Figure 4–3 Pulling Out a Mass Storage Drawer

MLO-007772

4–6 Mass Storage FRU Removal and Replacement

Figure 4–4 Pushing In a Mass Storage Drawer

MLO-007773

Spring tab

Mass Storage FRU Removal and Replacement 4–7

4.3 Identifying Mass Storage Drawers 1 and 2
There are two different mass storage drawer designs. You may encounter either
or both versions in a particular DECsystem 5900 system, depending on when it
was manufactured and whether or not a mass storage upgrade has been added.
Before begining a service procedure or upgrade, you must identify which type
of drawer you will be working on, and refer to the appropriate section of this
chapter for guidance. Use Table 4–1 to determine where the information you
need is located.
Table 4–1 Mass Storage Drawer Information
Mass Storage Drawer 1

Mass Storage
Drawer 2

Power switch on drawer front

Yes

Top cover

Two sections with screws

One piece

Exposed fans on rear of drawer

Yes

For detailed information see:

Section 4.4

Section 4.5

Distinguishing Features

The options available in mass storage drawers are the same regardless of the
design of the drawer; for a list of available options, see Section 1.1.8.

4.4 Mass Storage Drawer 1
This section describes the mass storage drawer 1.

4.4.1 Opening and Closing the Mass Storage Compartment
After pulling out the mass storage drawer 1 (see Section 4.2), access the mass
storage compartment by loosening the quarter-turn captive screws on the top
front cover of the drawer, and raising the cover. To close the compartment,
reverse the procedure (see Figure 4–5).

4–8 Mass Storage FRU Removal and Replacement

Figure 4–5 Opening the Mass Storage Drawer 1 Storage Compartment

MLO-007774

Quarter turn captive screws

Front top cover (mass storage compartment)

Mass Storage FRU Removal and Replacement 4–9

4.4.2 Removing and Replacing Storage Devices
Procedures for removal and replacement of storage devices located in a mass
storage drawer 1 are addressed in the following sections. Refer to the appropriate
section for details on a particular device.
4.4.2.1 Mass Storage Device Brackets
Each device is held in place within the mass storage drawer with a bracket.
There are two types of brackets used, depending upon the size (height) and
function of the particular device:
•

Drive bracket—for full-height devices which do not utilize removable media
(see Figure 4–6).

•

Removable media device bracket—for removable media full-height or
half-height devices (see Figure 4–7).

The removable media device bracket is always located in one of the removable
media slots at the right front of the mass storage drawer, and can accommodate
either one full-height, or one or two half-height devices with a divider in the
middle.
Table 4–2 matches typical internal devices with required brackets.
Table 4–2 Internal Storage Devices/Required Brackets
Device

Height

Bracket

RRD42

Half

Removable media device bracket with divider

RX26

Half

Removable media device bracket with divider

RZ57

Full

Drive bracket

RZ58

Full

Drive bracket

TLZ04

Full

Removable media device bracket

TLZ06

Full

Removable media device bracket

TKZ09

Full

Removable media device bracket

TZ30

Half

Removable media device bracket with divider

TZK10

Half

Removable media device bracket with divider

TZ85

Full

Removable media device bracket

4–10 Mass Storage FRU Removal and Replacement

Figure 4–6 Drive Bracket

MLO-007776

Mass Storage FRU Removal and Replacement 4–11

Figure 4–7 Removable Media Device Bracket

MLO-007777

4.4.3 Removing and Replacing Brackets and Devices
This section describes the removal and replacement of brackets and devices in the
mass storage drawer 1.
4.4.3.1 Removing Drive Bracket and Devices
To remove a drive bracket from the mass storage drawer:
1. Completely loosen the captive set screw located at the top of the bracket, and
gently pull up on the bracket handle, sliding the bracket and the device it
contains, if any, straight up. If it sticks, carefully use a screwdriver to pry up
the bracket without touching the device.
2. Disconnect the power and SCSI leads if the bracket contains a device (see
the section of this chapter which pertains to the particular device). Mark the
cables for easy identification when they are reconnected.

4–12 Mass Storage FRU Removal and Replacement

3. To replace or install a drive bracket containing a device in the mass storage
drawer, reverse the above procedure.
Figure 4–8 depicts the removal of a drive bracket and device from one position in
the drawer; others may be oriented a different way, but are removed in essentially
the same manner.
Figure 4–8 Removing a Drive Bracket

MLO-007793

To remove a device from a drive bracket, remove the bracket from the mass
storage drawer as instructed above. Remove the Phillips screws (four, two on
each side) and lock washers from the bracket, and slide the device out of the
bracket (see Figure 4–9).
To replace or install a new device, reverse the above procedures. If you are
replacing the device, note the orientation of the connectors to the bracket before
removal so that you can mount the replacement in the same manner.

Mass Storage FRU Removal and Replacement 4–13

If you are installing a new device, all connectors should face toward the middle
of the drawer, and be on the right-hand side as you face the connectors. See
Figure 4–10 for an example.
Figure 4–9 Removing a Device from a Drive Bracket

MLO-007794

4–14 Mass Storage FRU Removal and Replacement

Figure 4–10 Device Orientation Within a Drawer

MLO-007795

4.4.3.2 Removable Media Filler Panels
Removable media devices are always located in the front right-hand bracket(s) in
the mass storage drawer, where the disks or tapes may be inserted and removed
through the opening on the right front side of the drawer. Depending upon the
combination of removable media devices chosen by the customer (if any), the
removable media slots on the drawer will be covered by various filler panels
which must be removed to service devices behind them.
Four different panels may be present on the drawer; each panel has a top flange
which is fitted under the top of the slot, and each is attached by two screws at the
bottom (see Figure 4–11).

Mass Storage FRU Removal and Replacement 4–15

Figure 4–11 Removable Media Slot Filler Panels

MLO-007778

4–16 Mass Storage FRU Removal and Replacement

4.4.3.3 Removing Removable Media Device Bracket and Devices
To remove a removable media device bracket from the mass storage drawer:
1. Completely loosen the captive set screw located at the top of the bracket, and
gently pull up on the bracket handle, sliding the bracket and the device it
contains, if any, straight up. If it sticks, carefully use a screwdriver to pry
up the bracket without touching the device (see Figure 4–12). Although
not required, you may find it easier to remove the filler panel(s), (see
Section 4.4.3.2) on the drawer in front of the device beforehand.
2. Disconnect the power and SCSI leads if the bracket contains a device (see the
section of this chapter which pertains to the particular device). You may find
it helpful to mark the cables for ease in reconnecting them.
3. It may be necessary to slide the device back into the bracket so that it will
clear the front of the drawer as you lift up on the bracket. (Loosening the
divider will aid in sliding half-height devices.)

Mass Storage FRU Removal and Replacement 4–17

Figure 4–12 Removing a Removable Media Device Bracket

MLO-007796

4.4.3.3.1 Full-Height Devices To remove a full-height device from a removable
media device bracket, remove the bracket from the mass storage drawer as
instructed above. Slide the device forward out of the bracket. There is no divider
for full-height devices. See Figure 4–13.

4–18 Mass Storage FRU Removal and Replacement

Figure 4–13 Removing a Full-Height Device from a Removable Media Device
Bracket

MLO-008370

4.4.3.3.2 Half-Height Devices To remove a half-height device from a removable
media device bracket, remove the bracket from the mass storage drawer as
instructed above. Remove the screw which holds the bracket divider in place.
Remove the bracket divider, and slide the device forward out of the bracket (see
Figure 4–14).

Mass Storage FRU Removal and Replacement 4–19

Figure 4–14 Removing a Half-Height Device from a Removable Media Device
Bracket

MLO-007797

4.4.4 Mass Storage Drawer 1 Configuration
Note
If you are simply replacing a failed FRU, it is not necessary to alter the
configuration of a drawer.

A mass storage drawer can split SCSI devices between two SCSI controllers.
Devices in the mass storage drawer must be configured and connected before
turning on the system.
The customer/system manager may wish to alter the configuration of a mass
storage drawer; for details, see Section 4.6.

4–20 Mass Storage FRU Removal and Replacement

4.4.5 Removing and Replacing the Mass Storage Drawer 1 Power
Supply
A mass storage drawer 1 power supply is removed and replaced by the following
steps (see Figure 4–15):
1. Turn off the power to the drawer using either of the switches located on the
front or rear of the drawer.
2. Disconnect the power lead from the ac power cable on the rear of the drawer.
3. Pull out the drawer as described in Section 4.2.
4. Loosen the quarter-turn captive screws which hold down the mass storage
compartment cover (top front) of the drawer, and lift the cover up to access
the storage compartment (see Section 4.4.1).
5. Disconnect the four-pin switch cable and the SCSI device power cable from
the power supply, and close the cover.
6. Remove the two Phillips screws from the top rear of the power supply.
7. Lift up and back on the power supply.
8. If the power supply does not come out easily, it may be necessary to loosen
the lower rear panel on the rear of the drawer (large Phillips screws).
9. To install the new power supply, reverse the above procedures.

Mass Storage FRU Removal and Replacement 4–21

Figure 4–15 Removing the Mass Storage Drawer 1 Power Supply

MLO-007775

4–22 Mass Storage FRU Removal and Replacement

4.5 Mass Storage Drawer 2
This section describes the mass storage drawer 2.

4.5.1 Opening the Mass Storage Compartment
After pulling out the mass storage drawer 2 (see Section 4.2), access the mass
storage compartment by grasping the hand-hold in the middle of the top cover
and pulling up, raising and removing the cover. To close the compartment,
reverse the procedure (see Figure 4–16).
Figure 4–16 Opening the Mass Storage Drawer 2 Storage Compartment
1

MLO-008373

Cover

Mass Storage FRU Removal and Replacement 4–23

4.5.2 Removing and Replacing Storage Devices and Brackets
Procedures for removal and replacement of storage devices located in a mass
storage drawer 2 are addressed in the following sections. Refer to the appropriate
section for details on a particular device.

4.5.3 Mass Storage Device Brackets
Each device is held in place within the mass storage drawer 2 by means of a
bracket which is attached to the device. There are two types of brackets used,
depending upon the size (height) and function of the particular device.
The drive bracket accommodates one full-height device which the customer does
not need to physically access (see Figure 4–17).
The removable media device bracket is attached to the removable media devices
which are placed in the slots at the right front of the mass storage drawer. These
brackets can accommodate either full-height, or half-height devices, one per
device (see Figure 4–18).

4–24 Mass Storage FRU Removal and Replacement

Figure 4–17 Mass Storage Drawer 2 Drive Bracket

MLO-008374

Mass Storage FRU Removal and Replacement 4–25

Figure 4–18 Mass Storage Drawer 2 Removable Media Device Bracket

MLO-008375

4–26 Mass Storage FRU Removal and Replacement

4.5.4 Removing and Replacing Brackets and Devices
This section describes removal and replacement of devices and brackets in the
mass storage drawer 2.
4.5.4.1 Removing a Drive Bracket and Device
To remove a drive bracket (and the device it holds) from a mass storage drawer 2,
disconnect the power and internal SCSI leads, then loosen the two captive screws
on the bracket, and slide the bracket and device out (see Figure 4–19).
If you will be replacing the device, note the orientation of the connectors to the
bracket before removal so that you can mount the replacement in the same
manner. (For detailed information about devices, see the specific section in this
manual devoted to that device.)
Figure 4–19 Removing a Drive Bracket from the Mass Storage Drawer 2

MLO-008376

Mass Storage FRU Removal and Replacement 4–27

4.5.4.2 Removing a Device from a Drive Bracket
A device is removed from (or installed in) a drive bracket using four screws to
secure the two together (see Figure 4–20).
If you are installing a new device, all connectors should face toward the middle of
the drawer, and be on the bottom (see Figure 4–21).
Figure 4–20 Removing a Device from a Bracket

MLO-008377

4–28 Mass Storage FRU Removal and Replacement

Figure 4–21 Device Orientation Within a Drawer

MLO-008378

4.5.4.3 Removable Media Filler Panels
Removable media devices are always located in the front right-hand bracket(s) in
the mass storage drawer, where the disks or tapes may be inserted and removed
through the opening on the right front side of the drawer. Depending upon the
combination of removable media devices chosen by the customer (if any), the
removable media slots on the drawer will be covered by various filler panels
which must be removed to service devices behind them.
Different panels may be present on the drawer; each panel has a top flange which
is attached by one or two captive screws at the top (see Figure 4–22).

Mass Storage FRU Removal and Replacement 4–29

Figure 4–22 Removable Media Slot Filler Panels

MLO-008380

4–30 Mass Storage FRU Removal and Replacement

4.5.4.4 Removing Mass Storage Drawer 2 Removable Media Device Bracket
and Devices
In the mass storage drawer 2, full- and half-height removable media devices are
removed in the same manner.
To remove a removable media device bracket and the device it contains from the
mass storage drawer, disconnect the power and SCSI leads, loosen the two captive
screws on the top of the drawer by hand or with a Phillips screwdriver, and slide
the device and bracket out of the front of the drawer (see Figure 4–23).
If you will be replacing the device, note the orientation of the connectors to the
bracket before removal so that you can mount the replacement correctly. (For
detailed information about devices, see the specific section in this manual devoted
to that device.)

Mass Storage FRU Removal and Replacement 4–31

Figure 4–23 Removing a Removable Media Device Bracket from the Mass
Storage Drawer 2

MLO-008379

4–32 Mass Storage FRU Removal and Replacement

4.5.4.5 Removing Devices from Mass Storage Drawer 2 Removable Media
Device Brackets
Both full- and half-height removable media devices are removed from (or installed
in) a removable media device bracket using four screws to secure the two together.
See Figure 4–24 and Figure 4–25.
If you are installing a new device, all connectors should face toward the middle of
the drawer, and be on the right while facing the connector (see Figure 4–21).
Figure 4–24 Removing a Full-Height Device from a Mass Storage Drawer 2
Removable Media Device Bracket

MLO-008381

Mass Storage FRU Removal and Replacement 4–33

Figure 4–25 Removing a Half-Height Device from a Mass Storage Drawer 2
Removable Media Device Bracket

MLO-008382

4.5.5 Mass Storage Drawer 2 Configuration
Note
If you are simply replacing a failed FRU, it is not necessary to alter the
configuration of a drawer.

4–34 Mass Storage FRU Removal and Replacement

4.5.6 Removing and Replacing the Mass Storage Drawer 2 Power
Supply
A mass storage drawer 2 power supply is removed and replaced by the following
steps (see Figure 4–26):
1. Turn off the power to the drawer using the switch located on the rear of the
drawer.
2. Disconnect the power lead from the ac power cable on the rear of the drawer.
3. Pull out the drawer (see Section 4.2).
4. Remove the top cover (see Section 4.5.1).
5. Disconnect the 15-pin keyed SCSI device power cable connector from the
power supply.
Note
If you must change the LED, remove its two lead wires from positions 6
and 10 in the 15-pin keyed SCSI device power cable connector.

6. Disconnect the switch plug by squeezing the black connector vertically.
7. Remove the resistor by disconnecting the two wires and removing the nuts.
8. Remove the screw holding the power supply from the side of the drawer.
9. Push in the drawer (see Section 4.2).
10. From the rear of the system, slide the power supply out from the drawer.
11. To install the new power supply, reverse the above procedures.

Mass Storage FRU Removal and Replacement 4–35

Figure 4–26 Removing the Mass Storage Drawer 2 Power Supply

MLO-010173

Screw
Resistor

Keyed SCSI power cable connector

LED wires
Switch plug

4.5.7 Removing and Replacing the Mass Storage Drawer 2 Fans
The two fans on the rear of the drawer each have a cover; the fan and cover are
held in place with four screws (see Figure 4–27). To remove a fan:
1. Turn off the mass storage drawer (see Section 2.3.2.3).
2. Remove the screws and cover.
3. Unplug the connector.

4–36 Mass Storage FRU Removal and Replacement

4. To replace a fan, reverse these procedures.
Figure 4–27 Removing the Mass Storage Drawer 2 Fans

3
4
MLO-008386

Fan

Plug

Cover
Screws

4.6 Mass Storage Drawer Configuration
Note
If you are simply replacing a failed FRU, it is not necessary to alter the
configuration of a drawer.

Mass Storage FRU Removal and Replacement 4–37

A mass storage drawer can split SCSI devices between two SCSI controllers.
Devices in the mass storage drawer must be configured and connected before
turning on the system.
All mass storage drawers in the DECsystem 5900 system are ordered in a specific
factory-installed configuration as specified by the customer/system manager (this
includes mass storage upgrades ordered at a later date).
Two cabling configuration choices are available:
•

Single bus configuration (see Figure 4–28 for mass storage drawer 1, and
Figure 4–29 for mass storage drawer 2)

•

Split bus configuration (see Figure 4–30 for mass storage drawer 1, and
Figure 4–31 for mass storage drawer 2)

4.6.1 Altering the Factory-Set Configuration
The customer/system manager may wish to alter the configuration of a mass
storage drawer; the options and advantages are listed in Table 4–3.
Table 4–3 Configuration Option Choices/Advantages
Configuration Option

Advantages

Single bus

Preserves SCSI slots for other drawers/devices

Split bus

Improves processing speed and efficiency for heavily
used devices in the same drawer

4.6.1.1 Single Bus Configuration
For a single bus configuration, you must install a jumper between the SCSI ID 0
device and the SCSI ID 5 device as depicted in Figure 4–28 (mass storage drawer
1) and Figure 4–29 (mass storage drawer 2). The jumper connects the two buses
in a mass storage drawer; the resulting single bus configuration is terminated on
the rear of the drawer next to the SCSI signal input.

4–38 Mass Storage FRU Removal and Replacement

Figure 4–28 Single Bus Configuration for Mass Storage Drawer 1
2

MLO-008371

Jumper
Terminator

Signal cable

Mass Storage FRU Removal and Replacement 4–39

Figure 4–29 Single Bus Configuration for Mass Storage Drawer 2
2

MLO-008383

Signal cable
Jumper

Terminator
Note
Do not use more than seven SCSI devices on a single controller.
Figure 4–29 intentionally depicts a single bus configuration with more
than the allowable seven SCSI devices to demonstrate the appropriate
spacing and use of connectors for devices in any position in the drawer.

4–40 Mass Storage FRU Removal and Replacement

4.6.1.2 Split Bus Configuration
The split bus configuration uses both SCSI signal cables without a jumper. In this
configuration both buses must be terminated inside the drawer. See Figure 4–30
(mass storage drawer 1) and Figure 4–31 (mass storage drawer 2).
The split bus configuration can improve throughput by connecting two SCSI
controllers to one mass storage drawer.
Figure 4–30 Split Bus Configuration for Mass Storage Drawer 1

MLO-008372

Signal cable
Terminator

Terminator
Signal cable

Mass Storage FRU Removal and Replacement 4–41

Figure 4–31 Split Bus Configuration for Mass Storage Drawer 2
4

1
2

MLO-008384

Signal cable
Terminator

4–42 Mass Storage FRU Removal and Replacement

4.7 Identifying and Replacing a Faulty SCSI Device
A faulty device may be located using the ULTRIX UERF error log and ROMbased diagnostics, which will indicate the SCSI bus that the device is on (and
therefore which drawer the device is in). The device ID pinpoints the particular
device within the drawer. For detailed instruction, see the DECsystem 5900
Service Guide, EK–D590A–PS–001.

4.7.1 Procedure for Installing a New SCSI Device
Caution
Digital recommends that you use Digital-supplied buses intended for
interconnecting SCSI devices. Digital also recommends that you power
all units on the SCSI controller from a common power source. The proper
operation of any SCSI controller that uses cable assemblies or buses
not supplied by Digital, or not configured in accordance with Digital’s
recommendations, is not guaranteed.

Use the following procedure to install a device in a mass storage drawer:
1. Bring down the ULTRIX operating system.
2. Get the current system and drive configuration. At the console prompt type
the cnfg command. Then type a cnfg x of the system module (3) and each
PMAZ (x = the slot number 0–3) and write down the drive numbers on each
PMAZ. Remember that you can have a maximum of 7 SCSI devices on each
SCSI bus (up to 4 SCSI buses).
Discuss this with the customer/system manager, decide the new SCSI address
to be used, and determine any changes needed to existing device addresses.
Note
Duplicate SCSI ID addresses cannot be used on any one SCSI bus; the
same ID may appear (only once) on each SCSI bus in the system, however.

3. Shut off the system and/or the mass storage drawer(s) to be reconfigured.
To shut off one mass storage drawer, turn off one power switch on the mass
storage drawer (either one, if your version has two).

Mass Storage FRU Removal and Replacement 4–43

4. Set the address (SCSI ID) of the devices to 0–6, depending on the other
addresses on the SCSI bus (see Section 4.8). Do not conflict with other
addresses on the SCSI bus(es). Put the appropriate address label on the
bracket which contains the drive.
5. If this is an internal device:
a. Install it in the mass storage drawer. For details on installing devices
in a particular version of the mass storage drawer, see Section 4.4.3 (for
mass storage drawer 1) or Section 4.5.2 (for mass storage drawer 2).
b. Connect the power cable and SCSI signal bus to the device. Procedures
for specific devices are located in the section of this chapter devoted to
that device.
6. If this is an external SCSI device, connect the SCSI signal bus to the CPU
drawer.
7. Ensure that the appropriate ID label appears on the top surface of each
device which was added or reconfigured.
8. Turn on the system/mass storage drawers and make sure (>>cnfg x) shows
the drive(s) you installed and other drives/devices.
9. Run the SCSI send diagnostics and target tests on the device(s) to verify that
they work.
Caution
Be careful not to write on other drives if you use the w option with the
target test.

10. Boot the system and allow the customer/system manager to set up the system
to recognize the device(s).
Note
Detailed instructions and illustrations for physically removing/installing
and disconnecting/connecting a particular device are located in the
appropriate section of this chapter for that device.

4–44 Mass Storage FRU Removal and Replacement

4.8 SCSI IDs
This section describes the setting of SCSI IDs.

4.8.1 Default SCSI Device IDs
SCSI default settings for the DECsystem 5900 system are listed in Table 4–4.
The settings listed give optimal performance on most systems.
Table 4–4 DECsystem 5900 SCSI Device ID Default Settings
Device

CPU SCSI adapter

First removable media device

Boot device or first device

Remaining devices, in order

1,2,3,4,6,5

Remaining removable media devices

6,4,3,2,1,0

Note
No devices should ever use SCSI ID 7, as this is reserved for the SCSI
controller(s).

4.8.2 Setting SCSI IDs
Digital sets each SCSI device to a default SCSI ID setting before the equipment
leaves the factory. These default settings should be changed only when the server
is configured with more than one device.
When adding a SCSI device to the DECsystem 5900 system (or reconfiguring a
mass storage drawer) it can be necessary to change the ID (address) of affected
SCSI devices. The Digital services representative is responsible for changing the
SCSI ID settings as part of the reconfiguration process. In most instances, it will
only be necessary to ensure that there is not a SCSI ID conflict.
When each SCSI device is added or reconfigured, a label should be placed
on the top (visible) surface indicating what SCSI ID (address) it is. This
will help diagnose ID conflicts, which are bound to occur occasionally in both
manufacturing and at customer sites.

Mass Storage FRU Removal and Replacement 4–45

4.8.2.1 SCSI Jumpers and Switches
Varying means are employed (sets of switches, jumpers, incremental switch,
programming via front panel, and so on) to set the SCSI ID and parity, depending
on the particular device.
Table 4–5 identifies methods applicable to devices common to the DECsystem
5900 system.
Table 4–5 Common Devices and SCSI ID Method Used
Device Series

SCSI ID set by:

RZ57

Jumpers

TLZ04

Jumpers

TLZ06

Switches

TZ30

Switches

TZ85

Switches

TZK10

Jumpers

TKZ09

Switches

RRD42

Jumpers

RX26

Switches

TSZ07

Programming via front panel

TKZ08

Incremental switch

StorageServer 100

Switches

On devices with jumpers, the SCSI ID is set by inserting (in) or removing (out)
any of three jumpers in a specific combination. For the location of jumpers
and the proper settings for a particular device, see the section in this chapter
pertaining to that device.
On devices with sets of switches, the SCSI ID is set by moving any or all of the
switches to on or off. Incremental switches show a number which increments
up or down when the switch is pushed. Some devices employ the front panel
to set the address. For the method employed, and the location of switches on a
particular device, see the section in this chapter pertaining to that device.

4–46 Mass Storage FRU Removal and Replacement

Caution
To change SCSI ID switches, use a pen or small pointed object to move
the jumper; do not use a pencil point. Graphite particles can damage the
device.

4.9 Removing and Installing Storage Devices
This section describes the removal and installation of storage devices.

4.9.1 Nonremovable Media Devices Contained in Mass Storage
Drawers
This section describes the removal and installation of nonremovable media
storage devices in a mass storage drawer.
4.9.1.1 Removing/Installing an RZ57
The RZ57 is a full-height device entirely self-contained in the mass storage
drawer (it is a nonremovable media device).
The RZ57 utilizes a drive module (printed circuit board) which is attached to the
drive. To replace the drive module on an RZ57, remove the drive as instructed
below, and refer to Section 4.9.1.1.1.
To remove an RZ57, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–32), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install an RZ57, reverse the above procedure. In addition, you must set the
SCSI ID address of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the jumpers to that combination. An example of setting the device ID is
shown in Figure 4–33 and Table 4–6.
4. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–47

Figure 4–32 Disconnecting/Connecting an RZ57

1
MLO-007779

SCSI connector

Power connector

4–48 Mass Storage FRU Removal and Replacement

Figure 4–33 SCSI ID Jumpers on an RZ57

PIN SETS:
1
2
3

MLO-007780

Jumper
Figure 4–33 depicts setting the SCSI ID to ‘‘1’’ as an example.
Table 4–6 RZ57 SCSI Device ID Settings
Jumper in Position
To set SCSI ID to:

Out

Mass Storage FRU Removal and Replacement 4–49

4.9.1.1.1 Replacing RZ57 Drive Module To replace the drive module on an
RZ57, first remove the drive from the mass storage drawer (see Section 4.9.1.1),
and follow the steps below:
1. Remove the screws labeled
2. Remove the 5/32-inch screw

and

in Figure 4–34.

3. Disconnect the spindle motor cable from its connector.
4. Hold back the clip

while gently lifting the module up and out of the drive.

5. Disconnect the data cable from its connector.
To install a new drive module, reverse the above procedures.

4–50 Mass Storage FRU Removal and Replacement

Figure 4–34 Replacing the Drive Module on an RZ57
1
2
5
3

6
4

7
MLO-007781

Screw

Nut

Screw

Spindle motor connector

Screw

5/32-inch screw

Clip

Data cable

Mass Storage FRU Removal and Replacement 4–51

4.9.1.2 Removing/Installing an RZ58
The RZ58 is a full-height device entirely self-contained in the mass storage
drawer (it is a nonremovable media device).
To remove an RZ58, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–35), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install an RZ58, reverse the above procedure. In addition, you must set the
SCSI ID address of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the jumpers to that combination. An example of setting the device ID is
shown in Figure 4–36 and Table 4–7.
4. Apply the appropriate SCSI ID label to the device.

4–52 Mass Storage FRU Removal and Replacement

Figure 4–35 Disconnecting/Connecting an RZ58

1
MLO-007779

SCSI connector

Power connector

Mass Storage FRU Removal and Replacement 4–53

Figure 4–36 SCSI ID Jumpers on an RZ58

PIN SETS:
1
2
3

MLO-007780

Jumper
Figure 4–36 depicts setting the SCSI ID to ‘‘1’’ as an example.
Table 4–7 RZ58 SCSI Device ID Settings
Jumper in Position
To set SCSI ID to:

Out

4–54 Mass Storage FRU Removal and Replacement

4.9.2 Removable Media Devices Contained in Mass Storage
Drawers
This section describes the removal and installation of removable media storage
devices in a mass storage drawer.
4.9.2.1 Removing/Installing an RRD42
The RRD42 is a half-height device mounted in the removable media slots of the
mass storage drawer (right front of the drawer).
To remove an RRD42, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–37), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install an RRD42, reverse the above procedure, making sure to align the front
of the device with the filler panel. In addition, you must set the SCSI ID address
of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the jumpers to that combination. An example of setting the device ID is
shown in Figure 4–38 and Table 4–8.
4. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–55

Figure 4–37 Disconnecting/Connecting an RRD42

2
5V+5%

12V+10

GND

DC INP

GND

AUDIO

OUT

0 1 2

ID SELEC

MODE

F.GND

1
MLO-007515

SCSI connector

Power connector
Figure 4–38 SCSI ID Jumpers on an RRD42

Mode

5V+5%

GND

DC INP

GND

AUDIO

OUT

0 1 2

12V+10

ID SELEC

MODE

F.GND

MLO-007790

4–56 Mass Storage FRU Removal and Replacement

Figure 4–38 shows the SCSI ID set to ‘‘4’’ as an example.
Table 4–8 RRD42 SCSI Device ID Settings
Jumper in Position
To set SCSI ID to:

Parity/Mode

Out

4.9.2.2 Removing/Installing an RX26
The RX26 is mounted in the removable media slots of the mass storage drawer
(right front of the drawer).
The FRU part number for an RX26 includes an assembled adapter interface
module, and utilizes a drive ID switch to identify the FDD interface in addition
to SCSI ID switches. It is necessary to remove the adapter interface module from
the device if either the SCSI ID or the drive ID needs to be set.
Removing an RX26
To remove an RX26, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–39), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
Installing an RX26
To install an RX26, there are two switch settings to accomplish: the drive ID
switch, and the SCSI ID switches. Both of these settings require the removal of
the adapter interface module (see Removing/Installing RX26 Adapter Module).
After setting the SCSI and drive IDs, reinstall the RX26 by reversing the above
procedure (see Removing an RX26.) Make sure to align the front of the device
with the filler panel.

Mass Storage FRU Removal and Replacement 4–57

Removing/Installing RX26 Adapter Module
To remove or replace the adapter interface module, disconnect the signal cable
from the module to the device at the device end. Remove the four screws which
attach the bracket to the device, and lift out the device. See Figure 4–40.
Removing/Installing RX26 Adapter Brackets
Unless you are replacing the adapter interface module itself, it should not be
necessary to remove the adapter brackets from the adapter. If necessary, the
adapter brackets are attached to the adapter by means of four screws (two each).
See Figure 4–41.
Setting RX26 Drive ID Switch
The RX-series drive ID switch is a slide switch on the corner of the device itself
which must always be set to identify the particular FDD interface to which the
device responds. The factory setting is ‘‘0’’. An RX26 in the DECsystem 5900
system must be set to ‘‘2’’. See Figure 4–42. To access the drive ID switch,
you must remove the adapter interface module from the device as described in
Removing/Installing RX26 Adapter Module.
Note
Make sure that the drive ID switch on an RX26 (lower right-hand rear
corner) in a DECsystem 5900 system is always set to ‘‘2’’. Be careful not
to confuse the RX-series device identifier with the SCSI ID switches on
the side of the adapter (see Figure 4–42).

4.9.2.2.1 Setting RX26 SCSI ID Switches You must set the SCSI ID address
of the device: To access the SCSI ID switches, you must remove the adapter
interface module from the device as described in Removing/Installing RX26
Adapter Module.
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches on the adapter to that combination. An example of setting
the device ID is shown in Figure 4–43 and Table 4–9.

4–58 Mass Storage FRU Removal and Replacement

4. Apply the appropriate SCSI ID label to the device.
Note
It is not necessary to set the parity on an RX26 device.

Figure 4–39 Disconnecting/Connecting an RX26

1
MLO-007525

Adapter power connector

RX26 power connector

SCSI connector

Mass Storage FRU Removal and Replacement 4–59

Figure 4–40 Disconnecting/Connecting an RX26 Adapter Interface Module

MLO-008428

Screws (two from each side)

4–60 Mass Storage FRU Removal and Replacement

Figure 4–41 Detaching/Attaching Adapter Brackets
1
2

MLO-008427

Screws
Bracket

Adapter interface module

Mass Storage FRU Removal and Replacement 4–61

Figure 4–42 Setting the RX26 Drive ID Switch

MLO-007789

Drive ID switch (always set to ‘‘2’’ for the DECsystem 5900 system)

4–62 Mass Storage FRU Removal and Replacement

Figure 4–43 SCSI ID Switches on an RX26

O
F
F

MLO-008429

SCSI ID switches
Figure 4–43 shows the SCSI ID set to ‘‘5’’ as an example.
Table 4–9 RX26 SCSI Device ID Settings
Setting for Switch (On = Down)
To set SCSI ID to:

Down

Mass Storage FRU Removal and Replacement 4–63

4.9.2.3 TKZ09 (Internal Model)
Note
The TKZ09 is either an internal (to the mass storage drawer) or an
external tabletop unit on the DECsystem 5900 system. This section refers
to the internal model; for removal and replacement of the external model,
see Section 4.9.3.3.

The internal TKZ09 is a full-height device mounted in the removable media slots
of the mass storage drawer (right front of the drawer).
To remove an internal TKZ09, mark and disconnect the power and SCSI leads to
that particular device (see Figure 4–44), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install an internal TKZ09, reverse the above procedure, making sure to align
the front of the device with the filler panel. In addition, you must set the SCSI
ID address of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–45 and Table 4–10.
4. Apply the appropriate SCSI ID label to the device.

4–64 Mass Storage FRU Removal and Replacement

Figure 4–44 Disconnecting/Connecting an Internal TKZ09

1
MLO-008389

Power connector

SCSI connector

Mass Storage FRU Removal and Replacement 4–65

Figure 4–45 SCSI ID Switches on an Internal TKZ09

MLO-008390

Figure 4–45 shows the SCSI ID set to ‘‘5’’ as an example.
Table 4–10 TKZ09 SCSI Device ID Settings
Setting for Switch (On = Up)
To set SCSI ID to:

Off

4–66 Mass Storage FRU Removal and Replacement

4.9.2.4 Removing/Installing an Internal TLZ04
The TLZ04 is a full-height device mounted in the removable media slots in the
mass storage drawer (right front of the drawer).
To remove a TLZ04, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–46), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install a TLZ04, reverse the above procedure, making sure to align the front of
the device with the filler panel. In addition, you must set the SCSI ID address of
the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the jumpers to that combination. An example of setting the device ID is
shown in Figure 4–47 and Table 4–11.
4. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–67

Figure 4–46 Disconnecting/Connecting a TLZ04

1
MLO-007784

Power connector

SCSI connector

4–68 Mass Storage FRU Removal and Replacement

Figure 4–47 SCSI ID Jumpers on a TLZ04

1
2
Parity

MLO-008359

Figure 4–47 shows the SCSI ID set to ‘‘6’’ as an example.
Table 4–11 TLZ04 SCSI Device ID Settings
Jumper in Position
To set SCSI ID to:

Parity/Mode

Out

Mass Storage FRU Removal and Replacement 4–69

4.9.2.5 TLZ06
The TLZ06 is a full-height device mounted in the removable media slots of the
mass storage drawer (right front of the drawer).
To remove a TLZ06, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–48), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install a TLZ06, reverse the above procedure, making sure to align the front of
the device with the filler panel. In addition, you must set the SCSI ID address of
the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–49 and Table 4–12.
4. Apply the appropriate SCSI ID label to the device.
Figure 4–48 Disconnecting/Connecting a TLZ06

O
F
F

Power connector

MLO-008528

SCSI connector

4–70 Mass Storage FRU Removal and Replacement

Figure 4–49 SCSI ID Switches on a TLZ06

O
F
F

MLO-008527

Figure 4–49 shows the SCSI ID set to ‘‘0’’ as an example.
Table 4–12 TLZ06 SCSI Device ID Settings
Setting for Switch
To set SCSI ID to:

Down

Mass Storage FRU Removal and Replacement 4–71

4.9.2.6 Removing/Installing a TZ30
The TZ30 is a half-height device mounted in the removable media slots of the
mass storage drawer (right front of the drawer).
To remove a TZ30, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–50), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install a TZ30, reverse the above procedure, making sure to align the front of
the device with the filler panel. In addition, you must set the SCSI ID address of
the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–51 and Table 4–13.
4. Apply the appropriate SCSI ID label to the device.

4–72 Mass Storage FRU Removal and Replacement

Figure 4–50 Disconnecting/Connecting a TZ30

MLO-007785

SCSI connector

Power connector

Mass Storage FRU Removal and Replacement 4–73

Figure 4–51 SCSI ID Switches on a TZ30

MLO-005758

Figure 4–51 shows the SCSI ID set to ‘‘5’’ as an example.
Table 4–13 TZ30 SCSI Device ID Settings
Setting for Switch
To set SCSI ID to:

Parity/1

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

4–74 Mass Storage FRU Removal and Replacement

4.9.2.7 Removing/Installing an Internal TZ85
Note
The TZ85 is either an internal (to the mass storage drawer) or an external
tabletop unit on the DECsystem 5900 system. This section refers to the
internal model; for removal and replacement of the external model, see
Section 4.9.3.5.

The internal TZ85 is a full-height device mounted in the removable media slots of
the mass storage drawer (right front of the drawer).
To remove an internal TZ85, mark and disconnect the power and SCSI leads to
that particular device (see Figure 4–52), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install a TZ85, reverse the above procedure, making sure to align the front of
the device with the filler panel. In addition, you must set the SCSI ID address of
the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–53 and Table 4–14.
4. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–75

Figure 4–52 Disconnecting/Connecting an Internal TZ85

OFF

1 2 3 4

3
MLO-007798

Adapter power connector
TZ85 power connector

SCSI connector

4–76 Mass Storage FRU Removal and Replacement

Figure 4–53 SCSI ID Switches on an Internal TZ85

OFF

1 2 3 4
OFF

1 2 3 4

MLO-007792

Figure 4–53 shows the SCSI ID set to ‘‘2’’ as an example.
Table 4–14 Internal TZ85 SCSI Device ID Settings
Setting for Switch (On = Down)
To set SCSI ID to:

Parity/1

Off

Mass Storage FRU Removal and Replacement 4–77

4.9.2.8 Removing/Installing a TZK10
The TZK10 is a full-height device mounted in the removable media slots of the
mass storage drawer (right front of the drawer).
To remove a TZK10, mark and disconnect the power and SCSI leads to that
particular device (see Figure 4–54), and remove the device from the drawer.
See Section 4.4.3 if you have a mass storage drawer 1, or Section 4.5.2 if you
have a mass storage drawer 2. (To identify mass storage drawers 1 and 2, see
Section 4.3.)
To install a TZK10, reverse the above procedure, making sure to align the front of
the device with the filler panel. In addition, you must set the SCSI ID address of
the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the jumpers to that combination. An example of setting the device ID is
shown in Figure 4–55 and Table 4–15.
4. Apply the appropriate SCSI ID label to the device.
Figure 4–54 Disconnecting/Connecting a TZK10

2
MLO-007536

Power connector

SCSI connector

4–78 Mass Storage FRU Removal and Replacement

Figure 4–55 SCSI ID Jumpers on a TZK10

Parity 2 1 0

MLO-007788

Figure 4–55 shows the SCSI ID set to ‘‘5’’ as an example.
Table 4–15 TZK10 SCSI Device ID Settings
Jumper in Position
To set SCSI ID to:

Parity/Mode

Out

Mass Storage FRU Removal and Replacement 4–79

4.9.3 Removing/Installing External Options
This section describes the removal and installation of external tabletop or
standalone options.
4.9.3.1 StorageServer 100
Note
The StorageServer 100 is either a rackmounted device which occupies a
slot in the DECsystem 5900 enclosure, or an external standalone device.
This section refers to the external standalone model; for removal and
replacement of the rackmounted model, see Section 4.9.4.1.
If you are installing a new StorageServer 100, see the DECsystem 5900
StorageServer 100 Installation Guide, EK–D59SS–IN for complete installation
instructions.
The external and rackmounted StorageServer 100 are similar in many respects:
diagnostics are found in Section 4.9.4.1.7, power-on tests in Section 4.9.4.1.8, and
a description of the config command in Section 4.9.4.1.9.
An external StorageServer 100 is disconnected/connected via a SCSI cable from
one of the SCSI cable connectors to the appropriate SCSI slot on the rear of the
DECsystem 5900 CPU drawer (see Figure 4–56). Disconnect/connect the SCSI
connector and the power cable connector when removing or installing the external
StorageServer 100.
To install an external StorageServer 100, you must set the SCSI ID address of
the device:
Note
The StorageServer 100 has two optical disk drives enclosed in its cabinet;
each must be assigned a SCSI ID. In addition, the autochanger controller
must be assigned a third SCSI ID.

1. If you are replacing one StorageServer 100 with another one (in the same
configuration), note the optical disk SCSI ID settings of the device you are
removing.

4–80 Mass Storage FRU Removal and Replacement

2. Set the optical disk switches to that combination. The default setting
for optical disk drive one is 4; the default for drive two is 5. If a second
StorageServer 100 is connected on the same SCSI bus, its optical disk settings
are 1 and 2. An example of setting the device ID for optical disks is shown
in Figure 4–57 and Table 4–16. The SCSI ID switches are six, seven, and
eight. Drive one switches are on the left as you view the numbers; drive two
switches are on the right.
3. Use the front panel to set the SCSI ID for the autochanger controller. The
default setting is 3; if a second StorageServer 100 is connected on the
same SCSI bus, its SCSI ID should be 0. Use the control panel to set the
autochanger controller SCSI ID:
a. Switch on the StorageServer 100 power.
b. When the display shows READY, press the OPTION switch; TEST * is
displayed.
c.

Press the NEXT switch; CONF * is displayed.

d. Press the NEXT switch; INFO * is displayed.
e.

Press the NEXT switch; SCSI ID is displayed.

Press the ENTER switch; SCSI ID 3 is displayed.

g. Press the NEXT switch until the address you want is displayed.
h. Press the ENTER switch.
4. Apply the appropriate SCSI ID labels to the device.

Mass Storage FRU Removal and Replacement 4–81

Figure 4–56 External StorageServer 100 Rear Panel

6
4

5
3

1
MLO-009300

4–82 Mass Storage FRU Removal and Replacement

Power cord from the power
controller
Power switch

Power connector
SCSI ID address select switches

SCSI ports

50-pin connector to the SCSI port on the
StorageServer 100

SCSI terminator
 68-pin connector to the SCSI port on the
DECsystem 5900 system

Mass Storage FRU Removal and Replacement 4–83

Figure 4–57 External StorageServer 100 SCSI ID Switches

1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
MLO-008403

4–84 Mass Storage FRU Removal and Replacement

Figure 4–57 shows the SCSI ID switches for optical drive one set to ‘‘4’’ as an
example, and the switches for drive two set to ‘‘5’’ (the default settings).
Table 4–16 StorageServer 100 SCSI Device ID Settings
Setting for Switch (On = Up)
To set SCSI ID to:

Off

4 (drive 1 def)

Off

5 (drive 2 def)

Off

4.9.3.2 TKZ08
The TKZ08 is an external tabletop unit on the DECsystem 5900 system.
A TKZ08 is disconnected/connected via SCSI cable from one of the SCSI
connectors on the TKZ08 (the other is where it is terminated) to the appropriate
SCSI slot on the rear of the DECsystem 5900 CPU drawer (see Figure 4–58).
Disconnect/connect the SCSI connector and the power cable connector when
removing or installing a TKZ08.
To install a TKZ08 you must set the SCSI ID address of the device:
1. Refer to Section 4.8 to determine the SCSI ID to assign to the device.
2. Set the switch on the back of the unit to that combination by pressing with a
pointed object on either of the ‘‘buttons’’ beside the indicator to increment it
up or down. An example of setting the device ID is shown in Figure 4–59.
3. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–85

Figure 4–58 Disconnecting/Connecting a TKZ08

1
0

1
2

MLO-007799

Power connector

SCSI connector

4–86 Mass Storage FRU Removal and Replacement

Figure 4–59 SCSI ID Incremental Switch on a TKZ08

1
0

MLO-008393

Figure 4–59 shows the SCSI ID set to ‘‘5’’ as an example.

Mass Storage FRU Removal and Replacement 4–87

4.9.3.3 TKZ09 (External Model)
Note
The TKZ09 is either an internal (to the mass storage drawer) or an
external tabletop unit on the DECsystem 5900 system. This section refers
to the external model; for removal and replacement of the internal model,
see Section 4.9.2.3.

An external TKZ09 is disconnected/connected via SCSI cable from one of the SCSI
connectors on the TKZ09 (the other is where it is terminated) to the appropriate
SCSI slot on the rear of the DECsystem 5900 CPU drawer (see Figure 4–60).
Disconnect/connect the SCSI connector and the power cable connector when
removing or installing an external TKZ09.
To install a TKZ09 you must set the SCSI ID address of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–61 and Table 4–17.
4. Apply the appropriate SCSI ID label to the device.

4–88 Mass Storage FRU Removal and Replacement

Figure 4–60 Disconnecting/Connecting an External TKZ09

1
0

MLO-008396

Power connector

SCSI connector

Mass Storage FRU Removal and Replacement 4–89

Figure 4–61 SCSI ID Switches on a TKZ09

10 11 12

1
0

MLO-008397

Figure 4–61 shows the SCSI ID set to ‘‘5’’ as an example.
Table 4–17 TKZ09 SCSI Device ID Settings
Setting for Switch (On = Up)
To set SCSI ID to:

Off

4–90 Mass Storage FRU Removal and Replacement

4.9.3.4 TSZ07
A TSZ07 is disconnected/connected via SCSI cable from one of the SCSI
connectors on the TSZ07 (the other is where it is terminated) to the appropriate
SCSI slot on the rear of the DECsystem 5900 CPU drawer (see Figure 4–62).
Disconnect/connect the SCSI connector and the power cable connector when
removing or installing a TSZ07.
The SCSI ID is known as a ‘‘unit address’’ on the TSZ07. To install a TSZ07 you
must set the unit address of the device:
1. Refer to Section 4.8 to determine the SCSI ID (unit address) to assign to the
device.
2. The TSZ07 is shipped from the factory with a default unit address of ‘‘4’’.
Use the switches on the front of the TSZ07 to change the unit address, if
necessary:
a. Switch on the power switches.
b. If the on-line indicator is on, press the ONLINE switch so the indicator
goes off.
c.

Press the WRT EN/TEST switch.

d. Press the DENSITY SELECT switch.
e.

Press the LOAD/REWIND switch.

Press the WRT EN/TEST switch.

g. Press the UNLOAD switch.
h. Press the DENSITY SELECT switch; the alphanumeric display shows the
message UNIT (unit address).
i.

Press the ONLINE switch to enter the change mode.

Press either the LOAD/REWIND or the UNLOAD switch to step to the
next parameter value.

k. Press the ONLINE switch to enter the desired parameter value (unit
address); the drive returns to the review mode.
l.

Press and hold the DENSITY SELECT switch and then press the WRT
EN/TEST switch to save the new setting in nonvolatile memory and to
exit the service aid. The message SAVING appears on the display.

3. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–91

Figure 4–62 Disconnecting/Connecting a TSZ07

1
0

2
MLO-008391

Power connector

SCSI connector

4–92 Mass Storage FRU Removal and Replacement

4.9.3.5 TZ85
Note
The TZ85 is either an internal (to the mass storage drawer) or an external
tabletop unit on the DECsystem 5900 system. This section refers to the
external model; for removal and replacement of the internal model, see
Section 4.9.2.7.

An external TZ85 is disconnected/connected via SCSI cable from one of the SCSI
connectors on the TZ85 (the other is where it is terminated) to the appropriate
SCSI slot on the rear of the DECsystem 5900 CPU drawer (see Figure 4–63).
Disconnect/connect the SCSI connector and the power cable connector when
removing or installing an external TZ85.
To install a TZ85 you must set the SCSI ID address of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–64 and Table 4–18.
4. Apply the appropriate SCSI ID label to the device.

Mass Storage FRU Removal and Replacement 4–93

Figure 4–63 Disconnecting/Connecting an External TZ85

2
1
0

1
MLO-008392

Power connector

SCSI connector

4–94 Mass Storage FRU Removal and Replacement

Figure 4–64 SCSI ID Switches on an External TZ85

OFF

SCSI LSB

SCSI ID

SCSI ID MSB

DISABLE
PARITY
REMOTE PANEL
OF

1
0

MLO-008426

Figure 4–64 shows the SCSI ID set to ‘‘6’’ as an example.
Table 4–18 External TZ85 SCSI Device ID Settings
Setting for Switch (Left = On)
To set SCSI ID to:

Parity/1

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Right

Left

Mass Storage FRU Removal and Replacement 4–95

4.9.3.6 TZ857
The TZ857 is an external tabletop unit on the DECsystem 5900 system.
A TZ857 is disconnected/connected via SCSI cable from one of the SCSI
connectors on the TZ857 (the other is where it is terminated) to the appropriate
SCSI slot on the rear of the DECsystem 5900 CPU drawer (see Figure 4–65).
Disconnect/connect the SCSI connector and the power cable connector when
removing or installing a TZ857.
To install a TZ857 you must set the SCSI ID address of the device:
1. If you are replacing one SCSI device with another one (in the same
configuration), note the SCSI ID of the device you are removing, and skip
to step 3.
2. If you are installing a new device or changing the configuration, refer to
Section 4.8 to determine the SCSI ID to assign to the device.
3. Set the switches to that combination. An example of setting the device ID is
shown in Figure 4–66 and Table 4–19.
4. Apply the appropriate SCSI ID label to the device.

4–96 Mass Storage FRU Removal and Replacement

Figure 4–65 Disconnecting/Connecting a TZ857

MLO-008394

SCSI connector
Power connector

Cabinet outlet

Mass Storage FRU Removal and Replacement 4–97

Figure 4–66 SCSI ID Switches on a TZ857

10 11 12

MLO-008395

4–98 Mass Storage FRU Removal and Replacement

Figure 4–66 shows the SCSI ID set to ‘‘5’’ as an example.
Table 4–19 TZ857 SCSI Device ID Settings
Setting for Switch (On = Up)
To set SCSI ID to:

Parity/9

Off

4.9.4 Removing/Installing Rackmounted Options
This section describes the removal and installation of rackmounted options.
4.9.4.1 StorageServer 100 (Rackmounted)
Note
The StorageServer 100 is either a rackmounted device which occupies
a slot in the DECsystem 5900 enclosure, or an external standalone
device. This section refers to the rackmounted model; for removal and
replacement of the external model, see Section 4.9.3.1.
If you are installing a new rackmounted StorageServer 100, see the DECsystem
5900 StorageServer 100 Installation Guide, EK–D59SS–IN for complete
installation instructions.
WARNING
•

Two stepladders or stools are required to service the upper
drawers in a DECsystem 5900 system (slots 5 and 6).

•

Four people are needed to complete the installation or removal
of the rackmounted StorageServer 100.

Mass Storage FRU Removal and Replacement 4–99

This section describes the reinstallation or replacement of a rackmounted
StorageServer 100 in the DECsystem 5900 system when the slides and cross
bracket are already in the cabinet. (Procedures for the assembly and installation
of the rackmount slides and cross bracket are found in Section 4.9.4.1.6.)
4.9.4.1.1 Connecting/Disconnecting a Rackmounted StorageServer 100
A rackmounted StorageServer 100 is disconnected/connected via SCSI cable
from one of the SCSI connectors to the appropriate SCSI slot on the rear of
the DECsystem 5900 CPU drawer (see Figure 4–67). Disconnect/connect the
SCSI connector and the power cable connector when removing or installing the
rackmounted StorageServer 100.

4–100 Mass Storage FRU Removal and Replacement

Figure 4–67 Disconnecting/Connecting a Rackmounted StorageServer 100

2
3
1

7
5

MLO-008402

Mass Storage FRU Removal and Replacement 4–101

Power cord from the power
controller
Power switch

Power connector
SCSI ID address select switches

SCSI ports

50-pin connector to the SCSI port on
StorageServer 100

Terminator
 68-pin connector to the SCSI port on the
DECsystem 5900 system

4.9.4.1.2 Removing the Rackmounted StorageServer 100 This section
describes the removal of the rackmounted StorageServer 100 from the rackmount
slides and cross bracket. If it is also necessary to dissassemble and remove
the rackmount slides and cross bracket, reverse the assembly and installation
procedures found in Section 4.9.4.1.6.
Before removing a rackmounted StorageServer 100 from the DECsystem
5900 system for repair or replacement, the SCSI and power cables must be
disconnected (see Section 4.9.4.1.1).
Removing the Dress Mid Panel
Before you remove the StorageServer 100 from slots 1 and 2, you must remove
the dress mid panel (see Section 4.9.4.1.3) that is located immediately below slot
1 (it covers slot 0) by removing the four hex screws which attach it to the cabinet
rails (see Figure 4–71).
WARNING
•

Four people are needed to lift the rackmounted StorageServer
100 off its slides.

•

The stabilizer bar must be properly extended whenever a
rackmounted device is pulled out from the DECsystem 5900
cabinet.

1. Clear a workspace for the StorageServer 100 before it is removed from the
cabinet.
2. To release the StorageServer 100, remove the hex screws on the front of the
bracket support.
3. Pull the StorageServer 100 out from the cabinet so that the top may be
accessed.
4. Use a T-15 TORX to remove the two screws that secure the access latch to the
top of the StorageServer 100 and remove the latch (see Figure 4–68).
4–102 Mass Storage FRU Removal and Replacement

5. Reaching down into the StorageServer 100 through the access latch,
remove the screw which fastens the StorageServer 100 to the cross bracket
underneath. Use a small wrench to hold the nut from the bottom.
6. With the assistance of three other persons, lift the StorageServer 100 off the
slides and place it on the workspace.

Mass Storage FRU Removal and Replacement 4–103

Figure 4–68 Removing the StorageServer 100 from the Cabinet

MLO-008398

4–104 Mass Storage FRU Removal and Replacement

4.9.4.1.3 Installing the Dress Mid Panel Before you install the StorageServer
100 in slots 1 and 2, you must remove the filler panel (see Section 3.1.3) that is
located immediately below slot 1 (it covers slot 0). Replace it with the dress mid
panel as follows (see Figure 4–71):
1. Counting up from the bottom, attach U-nuts to holes 3 and 9 on both cabinet
rails.
2. Align the two holes on each side of the dress mid panel with hole 3 and hole 9
on the cabinet rails.
3. Use four hex screws to secure the panel to the cabinet rails.
With the rackmount slide assembly installed, you are now ready to install the
StorageServer 100 in the drawer.
4.9.4.1.4 Installation in the DECsystem 5900 Cabinet
WARNING
•

A step ladder or stool is required to service the upper drawers
in a DECsystem 5900 system (slots 5 and 6).

•

The installation of the StorageServer 100 requires four people.

Removing the Shipping Bracket
To remove the shipping bracket:
1. Locate the shipping bracket on the bottom of the device.
2. Use a T-15 TORX to remove the bracket screw.
3. Grasp the bracket at both ends and pull it straight out. Save the bracket and
screw in case you have to move or replace the StorageServer 100.
4. Locate the machine screw, washer, and nut that you use to secure the
StorageServer 100 to the cross bracket.
Removing the Access Latch
Remove the access latch located on the top of the StorageServer 100. When the
latch is removed you can see the hole on the bottom of the StorageServer 100 that
must be aligned with the hole in the center of the cross bracket (see Figure 4–68).
1. Set the StorageServer 100 upright so that you can see the access latch on the
top of the device.

Mass Storage FRU Removal and Replacement 4–105

2. Use a T-15 TORX to remove the two screws that secure the latch to the top of
the StorageServer 100 and remove the access latch. Put the latch aside.
Note
Look straight down into the StorageServer 100 and you can see the hole
through which you put the screw that secures the device to the cross
bracket.

Installing on the Slides
Complete the installation using the following procedures:
WARNING
The stabilizer bar must be properly extended.
1. Pull the slides approximately 12 inches out of the slot in which you are
installing the StorageServer 100.
2. Place the StorageServer 100 on the slides so that the hole on the bottom of
the server is aligned with the hole in the center of the cross bracket (see
Figure 4–68).
This may require that you adjust the position of the StorageServer 100 on the
slides until the two holes are aligned.
3. Insert the screw through the holes by reaching into the StorageServer 100.
4. Place the washer and nut on the bottom of the screw. Use a small wrench
to hold the nut, tighten the screw until approximately 1/8-inch of the thread
protrudes out from the nut (see Figure 4–68).
5. Replace the access latch.
6. Push the device all the way into the cabinet.
7. To secure the device to the cabinet, tighten the hex screws on the front of the
bracket support.
Note
The screws will be located at hole 12 if the StorageServer 100 occupies
slots 1 and 2; at hole 25 if the StorageServer 100 occupies slots 5 and 6.

4–106 Mass Storage FRU Removal and Replacement

The StorageServer 100 is now mounted on the rack. To connect the cables and to
set the SCSI IDs, see Section 4.9.4.1.1, and Section 4.9.4.1.5, respectively.
4.9.4.1.5 Setting the SCSI IDs
Note
The StorageServer 100 has two optical disk drives enclosed in its cabinet;
each must be assigned a SCSI ID. In addition, the autochanger controller
must be assigned a third SCSI ID.
Set the SCSI IDs on the autochanger controller and the two optical disk drives:
1. If you are replacing one StorageServer 100 with another one (in the same
configuration), note the optical disk SCSI ID settings of the device you are
removing.
2. Set the optical disk switches to that combination. The default setting
for optical disk drive one is 4; the default for drive two is 5. If a second
StorageServer 100 is connected on the same SCSI bus, its optical disk settings
are 1 and 2. An example of setting the device ID for optical disks is shown
in Figure 4–69 and Table 4–16. The SCSI ID switches are six, seven, and
eight. Drive one switches are on the left as you view the numbers; drive two
switches are on the right.
3. Use the front panel to set the SCSI ID for the autochanger controller. The
default setting is 3; if a second StorageServer 100 is connected on the
same SCSI bus, its SCSI ID should be 0. Use the control panel to set the
autochanger controller SCSI ID:
a. Switch on the StorageServer 100 power.
b. When the display shows READY, press the OPTION switch; TEST * is
displayed.
c.

Press the NEXT switch; CONF * is displayed.

d. Press the NEXT switch; INFO * is displayed.
e.

Press the NEXT switch; SCSI ID is displayed.

Press the ENTER switch; SCSI ID 3 is displayed.

g. Press the NEXT switch until the address you want is displayed.
h. Press the ENTER switch.

Mass Storage FRU Removal and Replacement 4–107

4. Apply the appropriate SCSI ID labels to the device.
Figure 4–69 SCSI ID Switches on a Rackmounted StorageServer 100

2
3
1

1
1

Power connector

Power switch

Power cord

MLO-008399

SCSI address select switches for drives 1 and 2
SCSI connector connected to SCSI port
Terminator connected to SCSI port

Figure 4–69 shows the SCSI ID switches for optical drive one set to ‘‘4’’ as
an example, and the switches for drive two set to ‘‘5’’ (the default settings).
Table 4–16 shows the appropriate switch settings for either an external or a
rackmounted StorageServer 100.

4–108 Mass Storage FRU Removal and Replacement

4.9.4.1.6 Assembling and Installing the Rackmount Slides and Cross Bracket
The procedures in this section are to be used only if it is necessary to assemble
and install the slides and cross bracket used to rackmount the StorageServer 100
in the DECsystem 5900 system.
Assembling the Slides
To assemble the slides, complete the following steps:
1. Place a bracket slide mount on the front of the outside section of the slide
assembly (Figure 4–70 depicts the right-hand slide assembly).
a. Align the first stud on the outside section and the hole at the front of the
bracket.
b. Align the second stud of the outside section of the slide assembly with the
second slot of the bracket.
2. Use two kep nuts and two washers to install the bracket on the slide as
shown in Figure 4–70.
3. Place a bracket slide mount at the rear of the outside section of the slide
assembly (see Figure 4–70).
a. Align the two studs on the outside section with the two slots on the
bracket.
b. The bracket should move freely at this point. Do not put any nuts on the
studs.
4. Place the guide at the rear of the outside section, just to the left of the rear
bracket slide mount (see Figure 4–70). It covers most of the rear bracket slide
mount.
a. Align the two lower holes on the guide with the two studs on the outside
section (you have already aligned the studs with the slots on the bracket
slide mount).
b. Use two kep nuts and two washers to secure the guide to the studs on the
outside section of the slide assembly (see Figure 4–70).
Figure 4–70 shows the components of a slide and a completed right slide.

Mass Storage FRU Removal and Replacement 4–109

Figure 4–70 Components of the Slide Assembly/Complete Slide Assembly
3
1

25 inches

4
MLO-008401

Slide assembly
Bracket slide mount

Guide
Completed slide

5. Repeat steps 1 through 3 to assemble the second (left) slide.
The two slides (right and left) are assembled.
Installing the Slides
Install the slides by completing the following steps:
1. Top/Front with an arrow pointing to the front of the slide is printed on the
top of each inside section of the slide assembly. Position the slide so that
the outside section is close to the wall of the cabinet when installing the
rackmounted slide assembly.

4–110 Mass Storage FRU Removal and Replacement

Note
•

Use hole 14 and hole 16 up from the bottom of the rails if slots 1
and 2 are to be used.

•

Use hole 27 and hole 29 down from the top of the rails if slots 5
and 6 are to be used.

2. Attach two U-nuts to the appropriate holes on the rails at each end.
3. Align the two holes on the flanges at each end of the slide with the
appropriate holes on the cabinet rails.
4. Position the slide so that the cabinet rails are between the two flanges of the
slide.
Note
Both flanges should be resting firmly against the cabinet rails, with no
space between the rails and the flanges.

5. Use two hex screws at each end of the slide to secure the slide to the cabinet
rails.
6. Repeat steps 1 through 5 for the other slide.
Note
There are only 25 inches between the flange on the front bracket slide
mount and the flange on the rear bracket slide mount. When the bracket
slide mounts are secured to the rear rail of the cabinet, you may have
to adjust the bracket so that the distance between the flanges is correct.
To make the adjustment, loosen the nuts on the guide and then you can
move the rear bracket slide mount as needed. Tighten the nuts after you
have secured the bracket slide mounts to the cabinet rails.

Mass Storage FRU Removal and Replacement 4–111

Assembling the Cross Bracket
Complete the following steps to assemble the rackmounted slide assembly:
1. Assemble the cross bracket:
a. Position the slats that make up the cross bracket, so that the three holes
in the middle of both slats are aligned.
b. Put the binder rivet in the large hole that is closest to the slotted end of
the cross bracket. Push the plunger on the rivet down, so that the top of
the rivet is smooth.
The holes are all aligned and the cross bracket is assembled.
2. Install the cross bracket:
a. Position the bracket so that the slotted end is toward the rear of the
cabinet.
b. Align the holes at the ends of the cross bracket with the third and fourth
studs (counting from the front to the rear of the inside slide assembly) on
the bottom of each of the two inside slide assemblies. Use four kep nuts
to secure the bracket to the inside slide assemblies (see Figure 4–71).
3. Install the front bracket support.
a. Counting up from the bottom of both front cabinet rails, attach U-nuts
to hole 12 if slots 1 and 2 are being used; if slots 5 and 6 are being used,
attach U-nuts to hole 25 counting down from the top on each front cabinet
rail.
b. Put a hex screw in each of the two holes at the front of the support and
use a ring retainer to anchor the screw. Do not tighten the hex screws at
this time.
c.

Align the two holes on the front bracket support with studs 1 and 2
(counting from the front to the rear of the slide) on the bottom of the slide
assemblies (see Figure 4–71).
The holes on the support and the studs on the slides are arranged so that
there is only one way the support fits on the slides.

d. Secure the support to the slide assemblies with four kep nuts.
Figure 4–71 shows how the rackmounted slide assembly is assembled. Note
where the various components of the assembly are located.

4–112 Mass Storage FRU Removal and Replacement

Figure 4–71 Assembling and Installing the Rackmounted Slide Assembly

3
5

4
6

MLO-008400

Slide assembly
Bracket slide mount

Guide

Front bracket support
Cross bracket
Dress mid panel

Mass Storage FRU Removal and Replacement 4–113

4.9.4.1.7 Diagnostic Tests
•

Complete the following tests:

Control Panel Diagnostic Test
This will tell you if the StorageServer 100 is operational.

•

The console command CNFG
This will tell you if the DECsystem 5900 system recognizes that the
StorageServer 100 is connected to the system.

4.9.4.1.8 Power-On Test The power-on test runs automatically when the
StorageServer 100 operation switch is first switched on, and may also be initiated
from the control panel. The power-on test initiates a controller test, a power
supply test, and a motor connection test. It then initializes the mechanism
by setting RAM variables to default values, and moves the picker to its home
position. The control panel should display: READY.
If the control panel does not display READY, but displays a message such as
FAIL, refer to the section on diagnostic tests in the Optical Library User’s Guide,
AA–PQ9RA–TE.
4.9.4.1.9 Using the Console Command CNFG
console:

Enter the following on the

>>CNFG X
where:
X

is the TURBOChannel slot that is connected to the StorageServer 100

equals 0, 1, or 2

The console display should be very similar to the following example:
1: PMAZ-AA DEC
V5.3c
TCF0 (SCSI = 7)
-------------------------------------------------DEV PID
VID
REV
SCSI DEV
===== ================ =========== ====== ========
3 C1701m
HP
5.34 MED
rz4 5.25 MF Drv 000 HP
4.12 DIR
rz5 5.25 MF Drv 000 HP
4.12 DIR
>>
If you do not see a similar display, refer to the section on diagnostic tests in the
Optical Library User’s Guide, AA–PQ9RA–TE.

4–114 Mass Storage FRU Removal and Replacement

4.10 Removing Mass Storage Drawers
WARNING
•

A mass storage drawer weighs 110 pounds when fully
populated, 63 pounds with no storage devices (includes
brackets). All storage devices should be removed from a
mass storage drawer before either lifting it into or out of the
enclosure.

•

At least two people are required to remove or replace a drawer
in the DECsystem 5900 system.

4.10.1 Mass Storage Drawer 1
Use the following procedures to remove and replace a mass storage drawer 1
(see Figure 4–72). To install the slides the mass storage drawer rides on, see
Section 4.11.2.
1. Remove all storage devices from the drawer; see the appropriate section of
this manual for specific instructions on removal and replacement of each
particular device.
2. Clear a workspace for the unattached drawer.
3. Turn off the power to the mass storage drawer (using the switch on the front
of the drawer).
4. Unplug all cables and buses from the back of the drawer, taking note of where
each is attached for future reference.
5. Pull out the stabilizer bar (Figure 3–5).
6. Pull out the mass storage drawer as described in Section 4.2.
7. Recruit another person to help lift the drawer off the slides.
8. With your partner on one side of the drawer and you on the other, push the
ends of the drawer slides toward the rear, while pushing up on the drawer
release tab (located on the side of the drawer on the top front corner.
9. While holding the tabs up, lift up on the front of the drawer and slide the
drawer forward out of the ‘‘notch’’ on the top of the slide, and lift it off the
slide.
10. Place the drawer on the workspace.

Mass Storage FRU Removal and Replacement 4–115

11. Push in the spring tabs on the outside of the drawer slides and move them
back into the cabinet for safety.
Figure 4–72 Removing a Mass Storage Drawer 1

MLO-008404

4–116 Mass Storage FRU Removal and Replacement

Slides
Spring tab

Drawer lip

Drawer release tab

Notch

4.10.2 Mass Storage Drawer 2
Use the following procedures to remove a mass storage drawer 2:
WARNING
At least two people are required to remove or replace a drawer in
the DECsystem 5900 system.
1. Remove all storage devices from the drawer; see the appropriate section of
this manual for specific instructions on removal and replacement of each
particular device.
2. Clear a workspace for the unattached drawer.
3. Turn off the power to the mass storage drawer (using the switch on the front
of the drawer).
4. Unplug all cables and buses from the back of the drawer, taking note of where
each is attached for future reference.
5. Pull out the stabilizer bar (Figure 3–5).
6. Pull out the mass storage drawer as described in Section 4.2.
7. Reach under the front of the middle slide and trip the catch upward so that
the slides may be fully extended (see Figure 4–73).
8. Press in on the slide tab and close the drawer slowly until the rear drawer
slide hex screw is exposed (lined up with the hole in the slide).
9. Remove the rear drawer slide hex screw.
10. Trip the middle slide catch upward again, and while holding the catch up,
extend the slides until they lock and the spring tabs are out.
11. Remove the front drawer slide hex screw.
12. Recruit another person to help lift the drawer off the slides and place it in the
space you cleared.

Mass Storage FRU Removal and Replacement 4–117

Figure 4–73 Removing a Mass Storage Drawer 2

4
3

1
2

MLO-008414

Slides
Slide catch

Spring tab
Drawer lip

4–118 Mass Storage FRU Removal and Replacement

Hex screws

4.11 Installing Mass Storage Drawers and Slides
This section describes the installation of mass storage drawers and slides.

4.11.1 Assembling Slides
Use the following procedures to assemble mass storage drawer slides. (See
Figure 4–74.) To become familiar with the slides and their assembly, observe the
location of slides and angle brackets on an installed mass storage drawer before
beginning.
1. Extend the slides until the spring tabs latch them open.
2. Place the slides on a worksurface with the inside (drawer side) facing down.
3. Assemble the slide angle brackets, one to the rear and one to the front of the
bottom slide section. The screws attaching the slide to the front angle bracket
are inserted by positioning the slide so that the screws may be inserted one
by one through the access hole from the inside of the slide.
Note
Leave the angle brackets loosely assembled for ease of installation on the
cabinet rails.
The small shelf on each angle bracket should engage the bottom of the slide,
and the four slots on each angle bracket should extend upward and align with
the extreme front and rear edges of the bottom slide section.
If slots do not extend upward while the shelf is engaged on the bottom of the
slide and align with the ends, you have the wrong angle brackets for that
location; check an installed mass storage drawer for reference.

Mass Storage FRU Removal and Replacement 4–119

Figure 4–74 Assembling Mass Storage Drawer Slides

Rear

3
Front
4

MLO-008405

Front angle bracket
Rear angle bracket

Screws
Access hole for inserting front angle bracket screws

4–120 Mass Storage FRU Removal and Replacement

4.11.2 Installing Assembled Slides in the Cabinet
The DECsystem 5900 system is shipped from the factory with U-nut clips in place
on the cabinet rails at the proper position for all mass storage drawer slides. If
these have been removed, or were not installed, the placement of drawers may be
determined by counting the holes in the cabinet rails, beginning on the top and
counting down.
See Table 3–3 for the typical DECsystem 5900 system drawer/hole location
pattern.
To install assembled slides, place the slides at the desired location for the mass
storage drawer and attach them squarely and firmly to the cabinet, using the four
screws and U-nuts for each angle bracket as depicted in Figure 4–75. Refer to an
installed mass storage drawer for details.
Caution
Once the angle brackets and slides are aligned perfectly to the cabinet
rails and set to the correct length, firmly tighten the screws holding the
slides to the angle brackets.

Mass Storage FRU Removal and Replacement 4–121

Figure 4–75 Installing Mass Storage Drawer Slides
Front

Rear

MLO-008406

4–122 Mass Storage FRU Removal and Replacement

Front angle bracket
Rear angle bracket

Screws
U-nuts

4.11.3 Removing Devices from the Drawer
Due to the weight of a fully populated mass storage drawer, it is recommended
that the SCSI devices be removed from the drawer prior to lifting or installing it.
In order to do this, the cover must be removed.
Mass storage drawers are opened differently depending upon the version; the
drawers may be identified by differing top covers as follows:
•

To identify the mass storage drawer version, see Section 4.3.

•

For information on mass storage drawer 1, see Section 4.4; for information on
mass storage drawer 2, see Section 4.5.

•

Information on removal of specific devices may be found in Section 4.9.

4.11.4 Installing the Drawer in the Cabinet
This section describes the installation of a mass storage drawer in the DECsystem
5900 system.
4.11.4.1 Mass Storage Drawer 1
Use the following procedures to install a mass storage drawer 1. To assemble
and install the slides the mass storage drawer rides on, see Section 4.11.1 and
Section 4.11.2.
WARNING
At least two people are required to remove or replace a drawer in
the DECsystem 5900 system.
1. Pull out the stabilizer bar (see Figure 3–5).
2. Pull out the drawer slides from the cabinet until the slides lock and the
spring tabs are out; you will be resting the entire drawer on these open slides,
so be sure they are firmly locked in place.
3. With your partner on one side of the drawer and you on the other, lift the
drawer up and place the ‘‘lip’’ on the side of the drawer on top of the slides;
tilt the back down very slightly and move the drawer back into the ‘‘notch’’
(now locked in place near the front of the enclosure on the top of the slide).
See Figure 4–76.

Mass Storage FRU Removal and Replacement 4–123

4. With your partner, push down on the drawer release tab (located on the side
of the drawer on the top front corner) on your respective sides while gently
maneuvering the tab into its corresponding hole in the slide.
You will hear/feel a ‘‘click’’ when each release tab engages.

4–124 Mass Storage FRU Removal and Replacement

Figure 4–76 Installing a Mass Storage Drawer 1

MLO-008415

Slides
Spring tab

Notch
Drawer release tab

Drawer lip

Mass Storage FRU Removal and Replacement 4–125

4.11.4.2 Mass Storage Drawer 2
Use the following procedures to install the mass storage drawer 2. To install the
slides the mass storage drawer rides on, see Section 4.11.2.
WARNING
At least two people are required to remove or replace a drawer in
the DECsystem 5900 system.
1. Pull out the stabilizer bar (see Figure 3–5).
2. Pull out the drawer slides from the cabinet until they catch in the partially
extended position.
3. Reach under the front of the middle slide and trip the catch upward so that
the slides may be fully extended.
4. While holding the catch up, extend the slides until they lock and the spring
tabs are out; you will be resting the entire drawer on these open slides, so be
sure they are firmly locked in place.
5. With your partner on one side of the drawer and you on the other, lift the
drawer up and place the ‘‘lip’’ on the side of the drawer on top of the slides.
Line the holes in the side of the drawer up with those on the inner part of the
slide (see Figure 4–77).
6. Attach the foremost hole on the extended portion of the slide to the front
drawer hole with a hex screw.
7. Press in on the slide tab and close the drawer slowly until the rear slide hole
is exposed (it should be lined up with the rear drawer hole at this point).
8. Attach the rear slide hole to the drawer with a hex screw.

4–126 Mass Storage FRU Removal and Replacement

Figure 4–77 Installing a Mass Storage Drawer 2

4
3

1
2

MLO-008416

Mass Storage FRU Removal and Replacement 4–127

Slides
Slide catch

Drawer lip
Hex screws

Spring tab

4.11.5 Replacing the Devices in the Drawer
WARNING
A stable stepladder or stool is required to service the upper
drawers in a DECsystem 5900 system.
1. Open the mass storage compartment cover.
2. Replace all brackets and devices in the exact location noted in Section 4.4
and/or Section 4.5.
3. Reconnect the power and SCSI cables (see Section 4.9).
4. Close the mass storage compartment cover.

4.11.6 Pushing In and Securing the Drawer
To push in the mass storage drawer, see Figure 4–4.

4.11.7 Connecting Power and SCSI Cables
After installing the drawer, reconnect the power and SCSI cables to the
receptacles they were attached to previously, or if installing a new mass storage
drawer, as instructed in the DECsystem 5900 Mass Storage Drawer Installation
Manual, EK–DECMS–IN. A01.

4–128 Mass Storage FRU Removal and Replacement

A
Field-Replaceable Units and Part
Numbers
Table A–1 lists the major DECsystem 5900 system field-replaceable units (FRUs)
and part numbers; Table A–2 lists the major DECsystem 5900 system device
descriptions and FRU part numbers.
Table A–1 DECsystem 5900 System FRUs and Part Numbers
FRU Type

Part Number

Description

Modules

70–28348–01

System module/stiffener

54–20627–01

CPU/daughter card, (DECsystem 5900 system,
R3000A)

54–21812–02

CPU/daughter card, (DECsystem 5900/260 system,
R4400)

54–20623–01

TURBOchannel Extender Adapter module

54–20625–01

TURBOchannel Extender module

54–21333–01

Power distribution module

MS02–CA

32 MB SAM memory

54–20948–01

(MS02–NV) 1 MB NVRAM module for Prestoserve

Power supplies

30–32506–03

CPU power supply assembly, 244 W

and controllers

30–36340–01

Mass storage power supply (mass storage
drawer 1), 400 W 12 V @23.1 A, +5.1 V @19.5 A

H7886–AA

Mass storage power supply (mass storage drawer 2)
@19.5 A

Memory options

(continued on next page)

Field-Replaceable Units and Part Numbers A–1

Table A–1 (Cont.) DECsystem 5900 System FRUs and Part Numbers
FRU Type

Part Number

Description

30–35415–01

Power controller, 120 Vac, single-phase, up to 24 A
to 6 outlets

30–35415–02

Power controller, 240 Vac, single-phase, up to 16 A
to 6 outlets

CPU drawer

17–03363–01

P.S. logic cable

cables

17–03335–01

Cable TCE interconnect

17–03364–01

+5 V CPU power harness

17–03365–01

TCE power harness

17–03379–01

CPU remote switch cable

17–03362–01

CPU ac input harness

17–00931–02

Remote sense cable to power controller

Mass storage

17–03359–01

Harness, disk power

drawer 1

17–03380–01

SCSI jumper cable

cables and buses

17–03366–01

Internal SCSI bus

17–03360–01

Power switch cable

Mass storage

17–03529-01

Harness, disk power with LED

drawer 2

17–03380–01

SCSI jumper cable

cables and buses

17–03528–01

Internal SCSI bus

Miscellaneous

17–03361–01

SCSI bus, drawer to drawer

cables and buses

17–00442–19

Drawer power cable

17–02641–02

PMAZ SCSI bus

Loopbacks and

12–25083–01

MMJ loopback connector

connectors

12–22196–02

Standard Ethernet loopback connector

29–24795–00

Communications modem loopback
(continued on next page)

A–2 Field-Replaceable Units and Part Numbers

Table A–1 (Cont.) DECsystem 5900 System FRUs and Part Numbers
FRU Type

Part Number

Description

12–33190–01

Communications line to MMJ adapter

12–37121–01

Mass storage drawer switch, on/off

12–24160–02

CPU drawer switch, on/off

12–37483–01

Blower assembly

12–23609–11

Fans, mass storage drawer 2, with harness

12–37004–01

External single-ended SCSI terminator

12–37004–02

External differential SCSI terminator

12–36929–01

Internal single-ended SCSI terminator

12–36929–02

Internal differential SCSI terminator

TURBOchannel

54–19874–01

PMAD standard Ethernet

options

54–19876–01

PMAZ/SCSI

70–26944–01

DEFZA–AA FDDI

70–22710–01

DEFZA–CA FDDI

54–20253–01

CITCA

DWTVX–AB

VME

70–29654–01

DEC WANcontroller 720

Miscellaneous

Field-Replaceable Units and Part Numbers A–3

Table A–2 DECsystem 5900 System Device Options
Option

Part Number

Location

Description

Mass Storage Options
RZ57

29–28158–01

Mass storage drawer

1 Gbyte hard disk

RZ57

29–28159–01

Mass storage drawer

1 Gbyte hard disk drive
module

RZ58

RZ58–E

Mass storage drawer

1.3 Gbyte 5400 rpm 5.25"
hard drive

StorageServer
100

See service
documentation

External pedestal

Optical disk (juke box)

StorageServer
100

See service
documentation

Rackmounted

Optical disk (juke box)

Removable Media Options
RX26

RX26–AA

Mass storage drawer

2.8 Mbyte 3.5" internal
floppy disk

RX26

54–20764–02

Mass storage drawer

RX26 FDI module

RX26

17–00285–00

Mass storage drawer

RX26 internal cable

RX26

17–03400–01

Mass storage drawer

RX26 power cable

RRD42

RRD42–AA

Mass storage drawer

600 Mbyte CD reader, 5.25"
device

TZK10

TZK10–AA

Mass storage drawer

320 Mbyte QIC tape drive

TZ30

TZ30–AX

Mass storage drawer

95 Mbyte 1/2" tape, 5.25"
drive

TLZ04

TLZ04–AA

Mass storage drawer

1.2 Gbyte DAT (4 mm)

TLZ04

TLZ04–DA

External tabletop

1.2 Gbyte DAT (4 mm)

TLZ06

TLZ06–BA

Mass storage drawer

4.0 Gbyte tape (4 mm)

TKZ09

TKZ09–AF

Mass storage drawer

5.0 Gbyte 8 mm internal

TKZ09

TKZ09–BA

External tabletop

5.0 Gbyte 8 mm external
tabletop tape

TZ85

TZ85–BX

Mass storage drawer

2.6 Gbyte 1/2" tape

TZ85

TZ85–TA

External tabletop

2.6 Gbyte 1/2" tape
(continued on next page)

A–4 Field-Replaceable Units and Part Numbers

Table A–2 (Cont.) DECsystem 5900 System Device Options
Option

Part Number

Location

Description

TZ857

SZ100–AA/AB

External pedestal

Automatic loader 18.2
Gbyte 1/2" tape, 7
cartridges

TSZ07

See spare
parts list

External tabletop

140-Mbyte 6400-bpi 9-track
tape drive

TKZ08

See spare
parts list

External tabletop

2.0-Gbyte 8 mm EXABYTE
external

Field-Replaceable Units and Part Numbers A–5

Index
A
Accessory kit, 2–23
Acoustics, 2–3
Air plenum compartment
location, 3–7

B
Blower
removal and replacement, 3–18
Blower compartment
location, 3–7
Brackets
mass storage drawer 1, 4–10
removable media, 4–17, 4–18,
4–19
mass storage drawer 2, 4–24
removable media, 4–31, 4–33

C
Cabinet
front view (fig.), 1–3
rear view (fig.), 1–4
Cable arm, 1–7, 3–4
removal and replacement, 3–47
Cables, 1–37, 3–4
for mass storage drawer (table), 1–37
for system, 1–37
power, 4–2
Cables and buses
external, 1–37
mass storage drawer, 1–37

Communications interface, 1–37
Configuration
mass storage drawer 1, 4–20
mass storage drawer 2, 4–34
Configuration of mass storage drawers,
4–37
choices, 4–38
single bus, 4–38
split bus, 4–41
Connections
CPU drawer, 1–12, 3–53
installation
CPU drawer, 2–16
mass storage drawer 1, 4–128
mass storage drawer 2, 4–128
Console
connection, location of, 2–17
connections, 2–16
Console terminal
parameters, 2–22
Cooling, 1–6
CPU compartment
blank panels, 3–40
location, 3–7
module locations, 3–36
opening, 3–27
CPU drawer, 1–9, 1–11, 3–6
blower, 1–15
removal and replacement, 3–18
blower (fig.), 1–15
compartments, 3–6, 3–7
connections, 1–12, 3–53
covers, 3–6
front top, 3–7
middle top, 3–7

Index–1

CPU drawer
covers (cont’d)
rear top, 3–7
CPU compartment
opening, 3–27
CPU/daughter card
removal and replacement, 3–27
features, 1–14
front panel (fig.), 1–11
installation in cabinet, 3–51
internal components, 1–12
memory options
removal and replacement, 3–30
NVRAM memory
removal and replacement, 3–31
opening front top cover, 3–12
opening middle top cover, 3–14
opening rear top cover, 3–17
options
memory, 1–18
TURBOchannel, 1–18
TURBOchannel Extender, 1–20
placement of, 3–48
power, 2–18
power distribution module
removal and replacement, 3–22
power supply, 1–16
removal and replacement, 3–20
power supply (fig.), 1–16
power switches, 1–9, 1–11
pulling out, 3–9
pushing in, 3–9, 3–53
rear panel (fig.), 1–12
removal and replacement, 3–43
slide assembly, 3–48
slides
removal and replacement, 3–48
switches, 2–18
TURBOchannel options
removal and replacement, 3–32
turning off, 2–18
turning on, 2–18
CPU/daughter card
removal and replacement, 3–27

Index–2

CPU/daughter card components, 1–34

D
Devices
mass storage drawer 1
removal and replacement, 4–10
mass storage drawer 2
removal and replacement, 4–27
removal of bracket, 4–28
removal and replacement, 4–47
RRD42
removal and replacement, 4–55
RX26
drive ID switch, 4–58
removal and replacement, 4–57
RZ57
removal and replacement, 4–47
RZ57 drive module
removal and replacement, 4–50
RZ58
removal and replacement, 4–52
SCSI IDs, 4–45, 4–46
StorageServer 100 (external)
removal and replacement, 4–80
StorageServer 100 (rackmounted)
installation, 4–100
removal and replacement, 4–99
TKZ08
removal and replacement, 4–85
TKZ09 (external)
removal and replacement, 4–88
TKZ09 (internal)
removal and replacement, 4–64
TLZ04 (internal)
removal and replacement, 4–67
TLZ06
removal and replacement, 4–70
TSZ07 (external)
removal and replacement, 4–91
TZ30
removal and replacement, 4–72
TZ85 (external)
removal and replacement, 4–93
TZ85 (internal)

Devices
TZ85 (internal) (cont’d)
removal and replacement, 4–75
TZ857 (external)
removal and replacement, 4–96
TZK10
removal and replacement, 4–78
Diagnostics
identifying faulty SCSI devices, 4–43
options, 2–23
power-up self-test, 2–22
resolving problems, 2–23
running, 2–22
troubleshooting, 2–22
errors, 2–22
Doors
opening, 2–12, 4–2
Drawer
design, 1–10
slots filler panels, 4–2
Drawers, 1–9
Ac power, 1–9
CPU drawer, 1–9
pushing in, 3–53
location of, 3–48
mass storage drawer, 1–9
slot filler panels, 3–4
Dual CPU drawer
installation of, 3–53

E
Electrical requirements, 2–4
EMI, 1–10
Enclosure
cables, 1–7, 3–4
power, 4–2
drawer filler panels, 3–4
front open view, 1–3
opening doors, 2–12, 3–2, 4–2
front, 3–3
rear, 3–2
overview, 1–2
physical dimensions, 2–1
power controller, 1–6
power distribution, 1–7

Enclosure (cont’d)
rackmounted options, 1–32
rear open view, 1–4
Ethernet, 1–37
Ethernet connector
location of, 2–17
External options, 1–33

F
Fans
mass storage drawer 2
removal and replacement, 4–36
Faulty SCSI devices, 4–43
FCC
See EMI
Field-replaceable units (FRUs), 3–1, 4–1
list, A–1
Filler panels
drawer slots, 4–2
removable media
mass storage drawer 1, 4–15
mass storage drawer 2, 4–29
Front top cover
location, 3–7

H
Heat dissipation, 2–3
Humidity values, 2–3

I
Installation
connections, 2–16
CPU drawer, 3–51
dual CPU drawer, 3–53
leveling the system, 2–8
mass storage drawer 1, 4–123
mass storage drawer 2, 4–126
power connections, 2–17
Installing devices, 4–43

Index–3

L
LEDs
on the system, 1–38
Leveling the system, 2–8

M
Mass storage drawer, 1–9
accessing, 4–4
cables and buses, 1–37
description, 1–21
identification, 1–21
internal options, 1–32
options
removable versus nonremovable,
1–21
power, 1–38, 2–19
pulling out, 4–4, 4–5
pushing in, 4–5
switches, 1–38, 2–19
turning off, 2–19
turning on, 2–19
version identification, 4–8
versions, 1–21
Mass storage drawer 1, 1–22, 4–8
configuration, 4–20, 4–37
choices, 4–38
single bus, 4–38
split bus, 4–41
connections, 1–23, 4–128
device brackets, 1–25, 4–10
device orientation, 4–15
devices
removal and replacement, 4–47
devices—brackets required (table),
4–10
drive bracket (fig.), 4–10
drive bracket removal, 4–12
front panel (fig.), 1–22
installation, 4–123
interior compartments, 1–23
opening top cover, 4–8
power harness, 1–25

Index–4

Mass storage drawer 1 (cont’d)
power supply, 1–25
power switch, 1–22, 1–25
rear panel (fig.), 1–23
removable media device bracket figure,
4–12
removable media filler panels, 4–15
removal and replacement, 4–115
removal and replacement of power
supply, 4–21
removal of full-height removable media
devices, 4–18
removal of half-height removable media
devices, 4–19
removal of removable media device
brackets, 4–17
removing devices, 4–12
replacing storage devices, 4–10
SCSI bus, 1–25
shipping brackets
removal of, 2–13
signal bus, 1–25
slides
assembly, 4–119
installation, 4–121
Mass storage drawer 2, 4–23
configuration, 4–34, 4–37
choices, 4–38
single bus, 4–38
split bus, 4–41
connections, 4–128
device brackets, 1–30, 4–24
device orientation figure, 4–29
device removal, 4–27
devices
removal and replacement, 4–47
fans
removal and replacement, 4–36
front panel (fig.), 1–27
installation, 4–126
interior compartments, 1–28
opening, 4–23
power harness, 1–30
power supply, 1–30
removal and replacement, 4–35

Mass storage drawer 2 (cont’d)
rear panel (fig.), 1–28
removable media filler panels, 4–29
removal and replacement, 4–115,
4–117
removal and replacement of devices,
4–24, 4–27
removal of full-height removable media
devices, 4–33
removal of removable media device
brackets, 4–31
removing devices from drive bracket,
4–28
SCSI bus, 1–30
shipping brackets
removal of, 2–15
signal bus, 1–30
slides
assembly, 4–119
installation, 4–121
Memory, 1–35
capacity, 1–1
removal and replacement, 3–30
Middle top cover
location, 3–7

N
Network
cables used, 1–37
connections, 2–16
NVRAM memory
removal and replacement, 3–31

O
Options
CPU drawer, 1–18
diagnostics, 2–23
memory
removal and replacement, 3–30
RRD42
removal and replacement, 4–55
RX26
drive ID switch, 4–58
removal and replacement, 4–57

Options (cont’d)
RZ57
removal and replacement, 4–47
RZ57 drive module
removal and replacement, 4–50
RZ58
removal and replacement, 4–52
StorageServer 100 (external)
removal and replacement, 4–80
StorageServer 100 (rackmounted)
installation, 4–100
removal and replacement, 4–99
TKZ08
removal and replacement, 4–85
TKZ09 (external)
removal and replacement, 4–88
TKZ09 (internal)
removal and replacement, 4–64
TLZ04 (internal)
removal and replacement, 4–67
TLZ06
removal and replacement, 4–70
TSZ07 (external)
removal and replacement, 4–91
TZ30
removal and replacement, 4–72
TZ85 (external)
removal and replacement, 4–93
TZ85 (internal)
removal and replacement, 4–75
TZ857 (external)
removal and replacement, 4–96
TZK10
removal and replacement, 4–78

P
Physical dimensions
enclosure, 2–1
Power
connections, 2–17
CPU drawer, 1–16, 2–18
LEDs, 1–38
mass storage drawer, 1–38, 2–19
power controller, 2–18
power sequencing, 1–9

Index–5

Power (cont’d)
requirements, 1–33
switch, 1–7
switches, functions of, 1–7
Power controller, 1–6, 3–4
circuit breaker, 2–18
figure, 1–6
power sequencing, 1–9
remote power sequencing, 1–9
removal and replacement, 3–4
turning off, 2–18
turning on, 2–18
Power distribution, 1–7
Power distribution module
removal and replacement, 3–22
Power supply
CPU drawer
removal and replacement, 3–20
mass storage drawer 1
removal and replacement, 4–21
mass storage drawer 2
removal and replacement, 4–35
Power supply compartment
location, 3–7
Power switch, 1–9
Power switches
location of (table), 1–39
Prestoserve, 1–35
Processing capabilities, 1–34
Processing features, 1–1

R
Rear top cover
location, 3–7
Removable media
removing protectors from,
RRD42
removal and replacement,
RX26
drive ID switch, 4–58
removal and replacement,
RZ57
removal and replacement,

Index–6

2–22
4–55
4–57
4–47

RZ57 drive module
removal and replacement, 4–50
RZ58
removal and replacement, 4–52

S
SCSI device
identifying faulty devices, 4–43
installing devices, 4–43
SCSI factory ID configuration, 1–36
SCSI IDs, 4–45
default settings, 4–45
jumpers and switches, 4–46
setting, 4–45
setting incremental switch on TKZ08,
4–85
setting jumpers on RRD42, 4–55
setting jumpers on RZ57, 4–47
setting jumpers on RZ58, 4–52
setting jumpers on TLZ04 (internal),
4–67
setting jumpers on TLZ06, 4–70
setting jumpers on TZK10, 4–78
setting switches on external
StorageServer 100, 4–80
setting switches on rackmounted
StorageServer 100, 4–107
setting switches on RX26, 4–58
setting switches on TKZ09 (external),
4–88
setting switches on TKZ09 (internal),
4–64
setting switches on TZ30, 4–72
setting switches on TZ85 (external),
4–93
setting switches on TZ85 (internal),
4–75
setting switches on TZ857, 4–96
setting TSZ07, 4–91
SCSI interface, 1–36
Shipping brackets
removal of, 2–13, 2–15

Site preparation, 2–1
acoustics, 2–3
electrical requirements, 2–4
leveling the system, 2–8
temperature and humidity, 2–3
Skirts
assembly of, 2–8
front, 2–8
rear, 2–10
sides, 2–9
Slides
CPU drawer
assembly of, 3–48
removal and replacement, 3–48
mass storage drawer 1
assembly, 4–119
installation, 4–121
mass storage drawer 2
assembly, 4–119
installation, 4–121
Stabilizer bar, 3–6, 3–8, 3–43, 3–51, 4–4
Static electricity, 2–2
Static precaution, 3–1, 4–1
Storage
capacity, 1–1
StorageServer 100
config command, 4–114
diagnostic tests, 4–114
power on test, 4–114
rackmounted installation, 4–105
shipping bracket
removing, 4–105
StorageServer 100 (external)
removal and replacement, 4–80
StorageServer 100 (rackmounted)
access latch, 4–105
connections, 4–100
dress mid panel, 4–105
removing, 4–102
installation, 4–100
removal and replacement, 4–99
slide and cross bracket assembly and
installation, 4–109

Switches
CPU drawer, 2–18
function of (table), 1–39
LEDs, 1–38
mass storage drawers, 1–38, 2–19
System module, 3–36
memory, 1–35
removal and replacement, 3–38
stiffener, 3–37
System module components, 1–34

T
Temperature values, 2–3
Terminal/console connector
location of, 2–17
TKZ08
removal and replacement, 4–85
TKZ09 (external)
removal and replacement, 4–88
TKZ09 (internal)
removal and replacement, 4–64
TLZ04 (internal)
removal and replacement, 4–67
TLZ06
removal and replacement, 4–70
Troubleshooting
diagnostics, 2–22
errors, 2–22
identifying faulty SCSI devices, 4–43
TSZ07 (external)
removal and replacement, 4–91
TURBOchannel
Extender module, 3–41
slots, 1–35
support, 1–1
TURBOchannel Extender compartment
location, 3–7
TURBOchannel Extender module
removal and replacement, 3–41
TURBOchannel options
DEC WANcontroller 720, 3–35
DEFZA, 3–34
one-slot, 3–34
PMAD, 3–34

Index–7

TURBOchannel options (cont’d)
PMAZ, 3–34
removal and replacement of modules,
3–32
three-slot options
CITCA, 3–36
VME, 3–34
TZ30
removal and replacement, 4–72
TZ85 (external)
removal and replacement, 4–93
TZ85 (internal)
removal and replacement, 4–75

Index–8

TZ857 (external)
removal and replacement, 4–96
TZK10
removal and replacement, 4–78

U
Uninterruptible power supply, 1–9
Unit address
setting TSZ07, 4–91
Unpacking the system, 2–6
UPS
See Uninterruptible power supply

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DECsystem 5900
Enclosure Maintenance Manual
EK–D590A–EN. B01

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