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EK-7000A-SV-001

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Document:	DEC 7000 AXP, VAX 7000 System Platform Service Manual
Order Number:	EK-7000A-SV
Revision:	001
Pages:	135
Original Filename:

OCR Text

DEC 7000 AXP System
VAX 7000
Platform Service Manual
Order Number EK–7000A–SV.001

This manual is intended for Digital service engineers. It includes configuration rules and instructions for the removal and replacement of fieldreplaceable units (FRUs) in the H9F00–AA/AB/AC and H9F00–BA/BB/BC
cabinets.

digital equipment corporation
maynard, massachusetts

First Printing, November 1992
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.
The software, if any, 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.
Copyright © 1992 by Digital Equipment Corporation.
All Rights Reserved.
Printed in U.S.A.

The following are trademarks of Digital Equipment Corporation:
Alpha AXP
AXP
DEC
DECchip
DEC LANcontroller
DECnet

DECUS
DWMVA
OpenVMS
ULTRIX
UNIBUS
VAX

VAXBI
VAXELN
VMScluster
XMI
The AXP logo

OSF/1 is a registered trademark of the Open Software Foundation, Inc.

FCC NOTICE: The equipment described in this manual generates, uses, and may
emit radio frequency energy. The equipment has been type tested and found to
comply with the limits for a Class A computing device pursuant to Subpart J of
Part 15 of FCC Rules, which are designed to provide reasonable protection against
such radio frequency interference when operated in a commercial environment. Operation of this equipment in a residential area may cause interference, in which
case the user at his own expense may be required to take measures to correct the
interference.

Contents
Preface ..................................................................................................... vii
Chapter 1 Configuration Rules
1.1
1.2
1.3
1.4
1.5
1.6
1.6.1
1.6.2
1.6.3
1.6.4
1.6.5
1.6.6

Chapter 2 Cabinet Doors and Panels
2.1
2.2
2.3

Door and Cable Cover Removal and Replacement ............... 2-2
Top Panel and Air Filter Removal and Replacement .......... 2-4
Side Panel Removal and Replacement ................................. 2-6

Chapter 3 Cabinet Control System
3.1
3.2
3.3
3.4
3.5

Control Panel Removal and Replacement ............................ 3-2
Removable Media Device Removal and Replacement .......... 3-4
Local Disk Converter Removal and Replacement ................ 3-6
Cabinet Control Logic Module Removal and Replacement . 3-8
Pressure Sensor Removal and Replacement ...................... 3-10

iii

Chapter 4 Power and Cooling Systems
4.1
4.2
4.3
4.4

Power Regulator Removal and Replacement ....................... 4-2
AC Input Box Removal and Replacement ............................ 4-4
DC Distribution Box Removal and Replacement ................. 4-6
Blower Removal and Replacement ........................................ 4-8

Chapter 5 LSB Card Cage
5.1
5.2
5.3

I/O Cables Removal and Replacement .................................. 5-2
IOP Module Removal and Replacement ............................... 5-4
LSB Card Cage Removal and Replacement ......................... 5-6

Chapter 6 I/O Plug-In Units
6.1
6.2
6.3

Power Regulator Removal and Replacement ....................... 6-2
Enclosure and Card Cage Removal and Replacement ......... 6-4
Air Filter Cleaning ................................................................. 6-6

Chapter 7 Disk Plug-In Units
7.1
7.1.1
7.1.2
7.1.3
7.1.4
7.2
7.2.1
7.2.2
7.2.3
7.2.4
7.2.5

SCSI Disk and Tape Plug-In Unit......................................... 7-2
Disk or Tape Removal and Replacement ....................... 7-2
Power Supply Removal and Replacement ...................... 7-4
Shelf Removal and Replacement .................................... 7-6
Enclosure Removal and Replacement ............................ 7-8
DSSI Disk Plug-In Unit....................................................... 7-10
Local Disk Converter Removal and Replacement ....... 7-10
Remote Front Panel Removal and Replacement ......... 7-12
Disk Removal and Replacement ................................... 7-14
Enclosure Removal and Replacement .......................... 7-16
Power and Signal Harness Removal and
Replacement................................................................... 7-18

Chapter 8 Battery Plug-In Unit
8.1
8.2
8.3

Fuse Removal and Replacement ........................................... 8-2
Cable Removal and Replacement .......................................... 8-4
Battery Removal and Replacement ....................................... 8-6

Appendix A Field-Replaceable Units
A.1
A.2
A.3
A.4
A.5
A.6
A.7
A.8
A.9

FRUs Accessible from the Front of the Cabinet ................... A-2
FRUs Accessible from the Rear of the Cabinet .................... A-4
Platform Cables ...................................................................... A-6
FRUs in the XMI Plug-In Unit.............................................. A-8
FRUs in the VAXBI Plug-In Unit....................................... A-10
FRUs in the Futurebus+ Plug-In Unit............................... A-12
FRUs in the SCSI Disk and Tape Plug-In Unit................. A-14
FRUs in the DSSI Disk Plug-In Unit.................................. A-16
FRUs in the Battery Plug-In Unit...................................... A-18

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
1-13
2-1
2-2
2-3
3-1
3-2
3-3
3-4
3-5
4-1
4-2
4-3
4-4
5-1
5-2
5-3

Main Cabinet .......................................................................... 1-2
Expander Cabinet .................................................................. 1-4
System With Two Expander Cabinets (Front View) ............ 1-5
Power System ......................................................................... 1-6
LSB Card Cage (Top View) .................................................... 1-8
I/O Interface ......................................................................... 1-10
Location of PIU Quadrants .................................................. 1-12
XMI Plug-In Unit................................................................. 1-14
VAXBI Plug-In Unit............................................................. 1-16
Futurebus+ Plug-In Unit..................................................... 1-18
SCSI Disk and Tape Plug-In Unit....................................... 1-20
DSSI Disk Plug-In Unit....................................................... 1-22
Battery Plug-In Unit............................................................ 1-24
Cabinet Door and Cable Cover .............................................. 2-2
Top Panel ................................................................................ 2-4
Side Panel ............................................................................... 2-6
Control Panel .......................................................................... 3-2
Removable Media Device ....................................................... 3-4
Local Disk Converter ............................................................. 3-6
Cabinet Control Logic Module (Viewed from Front of
Cabinet) .................................................................................. 3-8
Pressure Sensor Location (Viewed from Front of
Cabinet) ................................................................................ 3-10
Power Regulators ................................................................... 4-2
AC Input Box .......................................................................... 4-4
DC Distribution Box .............................................................. 4-6
Blower ..................................................................................... 4-8
I/O Cable ................................................................................ 5-2
Rear of LSB Card Cage Showing IOP Module ..................... 5-4
LSB Card Cage ...................................................................... 5-6

6-1
6-2
6-3
7-1
7-2
7-3
7-4
7-5
7-6
7-7
7-8
7-9
8-1
8-2
8-3
8-4
A-1
A-2
A-3
A-4
A-5
A-6
A-7
A-8
A-9

I/O PIU Power Regulators ..................................................... 6-2
I/O PIU Enclosure .................................................................. 6-4
I/O PIU Air Filter ................................................................... 6-6
SCSI PIU Disks and Tapes .................................................... 7-2
SCSI PIU Power Supply ........................................................ 7-4
SCSI PIU Shelf ....................................................................... 7-6
SCSI PIU Enclosure ............................................................... 7-8
DSSI PIU — Underside of Brick Cover Showing Local
Disk Converter ..................................................................... 7-10
DSSI PIU — Underside of Brick Cover Showing Remote
Front Panel ........................................................................... 7-12
DSSI PIU Disks .................................................................... 7-14
DSSI PIU Enclosure ............................................................ 7-16
DSSI PIU Power and Signal Harness ................................. 7-18
Battery PIU Fuse ................................................................... 8-2
Battery PIU (Rear) Showing Cable Routing ......................... 8-4
Battery Hold-Down Brackets................................................ 8-6
Rear Batteries (Blocks B and C) ........................................... 8-7
Platform Cabinet (Front) Showing FRU Locations .............. A-2
Platform Cabinet (Rear) Showing FRU Locations ............... A-4
Platform Cabinet (Rear and Front) Showing Cables ........... A-6
XMI Plug-In Unit (Front) Showing FRU Locations............. A-8
VAXBI Plug-In Unit (Front) Showing FRU Locations....... A-10
Futurebus+ Plug-In Unit (Front) Showing FRU
Locations ............................................................................... A-12
SCSI Disk Plug-In Unit (Front) Showing FRU
Locations ............................................................................... A-14
DSSI Disk Plug-In Unit (Front) Showing FRU
Locations ............................................................................... A-16
Battery Plug-In Unit (Rear) Showing FRU Locations....... A-18

Tables
1
2
1-1
1-2

DEC 7000/VAX 7000 Documentation ..................................... ix
Related Documents .................................................................. xi
Main Cabinet Variants .......................................................... 1-3
Memory Module Placement ................................................... 1-8

Preface
Intended Audience
This manual is written for the customer service engineer.

Document Structure
This manual uses a structured documentation design. Topics are organized
into small sections for efficient reference. Each topic begins with an abstract. You can quickly gain a comprehensive overview by reading only the
abstracts. Next is an illustration, which also provides quick reference.
Last in the structure is a procedure.
This manual has eight chapters and one appendix, as follows:
•

Chapter 1, Configuration Rules, gives you information about configuring each part of the system.

•

Chapters 2 through 8 provide removal and replacement instructions
for each field-replaceable unit:
— Chapter 2, Cabinet Doors and Panels
— Chapter 3, Cabinet Control System
— Chapter 4, Power and Cooling Systems
— Chapter 5, LSB Card Cage
— Chapter 6, I/O Plug-In Units
— Chapter 7, Disk Plug-In Units
— Chapter 8, Battery Plug-In Unit

•

Appendix A contains a quick reference to the location of each fieldreplaceable unit.

vii

Conventions Used in This Document
Terminology. Unless specified otherwise, the use of "system" refers to
either a DEC 7000 AXP or VAX 7000 system. The DEC 7000 AXP systems
use the Alpha AXP architecture. References in text use DEC 7000 to refer
to DEC 7000 AXP systems.
When a discussion applies to only one system, an icon is used to highlight
that system. Otherwise, the discussion applies to both systems. Thus, the
abstract for a module that applies only to DEC 7000 systems would look
like this:
This section shows a sample boot of Open VMS Alpha AXP
DEC from the RRD42 CD drive for DEC 7000 systems. The first
7000
step is issuing the show device command to determine the
location of the RRD42.
Book titles. In text, if a book is cited without a product name, that book is
part of the hardware documentation. It is listed in Table 1 along with its
order number.
Icons. The icons shown below are used in illustrations for designating part
placement in the system described. A shaded area in the icon shows the location of the component or part being discussed.

Front

Rear

Part numbers. Part numbers are listed in Appendix A of this manual.

Documentation Titles
Table 1 lists the books in the DEC 7000 and VAX 7000 documentation set.
Table 2 lists other documents that you may find useful.

viii

Table 1 DEC 7000/VAX 7000 Documentation
Title

Order Number

Installation Kit

EK–7000B–DK

Site Preparation Guide

EK–7000B–SP

Installation Guide

EK–700EB–IN

Hardware User Information Kit

EK–7001B–DK

Operations Manual

EK–7000B–OP

Basic Troubleshooting

EK–7000B–TS

Service Information Kit—VAX 7000

EK–7002A–DK

Platform Service Manual

EK–7000A–SV

System Service Manual

EK–7002A–SV

Pocket Service Guide

EK–7000A–PG

Advanced Troubleshooting

EK–7001A–TS

Service Information Kit—DEC 7000

EK–7002B–DK

Platform Service Manual

EK–7000A–SV

System Service Manual

EK–7002B–SV

Pocket Service Guide

EK–7700A–PG

Advanced Troubleshooting

EK–7701A–TS

Table 1 DEC 7000/VAX 7000 Documentation (Continued)
Title

Order Number

Reference Manuals
Console Reference Manual

EK–70C0B–TM

KA7AA CPU Technical Manual

EK–KA7AA–TM

KN7AA CPU Technical Manual

EK–KN7AA–TM

MS7AA Memory Technical Manual

EK–MS7AA–TM

I/O System Technical Manual

EK–70I0A–TM

Platform Technical Manual

EK–7000A–TM

Upgrade Manuals

KA7AA CPU Installation Guide

EK–KA7AA–IN

KN7AA CPU Installation Guide

EK–KN7AA–IN

MS7AA Memory Installation Guide

EK–MS7AA–IN

KZMSA Adapter Installation Guide

EK–KXMSX–IN

DWLMA XMI PIU Installation Guide

EK–DWLMA–IN

DWMBB VAXBI PIU Installation Guide

EK–DWMBB–IN

H7237 Battery PIU Installation Guide

EK–H7237–IN

H7263 Power Regulator Installation Guide

EK–H7263–IN

BA654 DSSI Disk PIU Installation Guide

EK–BA654–IN

BA655 SCSI Disk and Tape PIU Installation
Guide

EK–BA655–IN

Removable Media Installation Guide

EK–TFRRD–IN

Table 2 Related Documents
Title

Order Number

General Site Preparation
Site Environmental Preparation Guide

EK–CSEPG–MA

System I/O Options
BA350 Modular Storage Shelf Subsystem
Configuration Guide

EK–BA350–CG

BA350 Modular Storage Shelf Subsystem User’s
Guide

EK–BA350–UG

BA350-LA Modular Storage Shelf User’s Guide

EK–350LA–UG

CIXCD Interface User Guide

EK–CIXCD–UG

DEC FDDIcontroller 400 Installation/Problem
Solving

EK–DEMFA–IP

DEC LANcontroller 400 Installation Guide

EK–DEMNA–IN

DEC LANcontroller 400 Technical Manual

EK–DEMNA–TM

DSSI VAXcluster Installation and
Troubleshooting Manual

EK–410AA–MG

InfoServer 150 Installation and Owner’s Guide

EK–INFSV–OM

KDM70 Controller User Guide

EK–KDM70–UG

KFMSA Module Installation and User Manual

EK–KFMSA–IM

KFMSA Module Service Guide

EK–KFMSA–SV

RRD42 Disc Drive Owner’s Manual

EK–RRD42–OM

RF Series Integrated Storage Element User Guide

EK–RF72D–UG

TF85 Cartridge Tape Subsystem Owner’s Manual

EK–OTF85–OM

TLZ06 Cassette Tape Drive Owner’s Manual

EK–TLZ06–OM

Table 2 Related Documents (Continued)
Title

Order Number

Operating System Manuals
Alpha Architecture Reference Manual

EY–L520E–DP

DEC OSF/1 Guide to System Administration

AA–PJU7A–TE

DECnet for OpenVMS Network Management
Utilities

AA–PQYAA–TK

Guide to Installing DEC OSF/1

AA–PS2DA–TE

OpenVMS Alpha Version 1.0 Upgrade and
Installation Manual

AA–PQYSA–TE

VMS Upgrade and Installation Supplement:
VAX 7000–600 and VAX 10000–600 Series

AA–PRAHA–TE

VMS Network Control Program Manual

AA–LA50A–TE

VMSclusters and Networking
HSC Installation Manual

EK–HSCMN–IN

SC008 Star Coupler User’s Guide

EK–SC008–UG

VAX Volume Shadowing Manual

AA–PBTVA–TE

Peripherals
Installing and Using the VT420 Video Terminal

EK–VT420–UG

LA75 Companion Printer Installation and User
Guide

EK–LA75X–UG

xii

Chapter 1
Configuration Rules
This chapter provides configuration information for the following system
components:
•

Main Cabinet

•

Expander Cabinet

•

Power System

•

LSB Card Cage

•

I/O Interface

•

Plug-In Units
— XMI Plug-In Unit
— VAXBI Plug-In Unit
— Futurebus+ Plug-In Unit
— SCSI Disk and Tape Plug-In Unit
— DSSI Disk Plug-In Unit
— Battery Plug-In Unit

Configuration Rules 1-1

1.1 Main Cabinet
Figure 1-1 shows the components of the main cabinet. Configuration of these components is discussed in this chapter.

Figure 1-1

Main Cabinet

Front

Rear
Cabinet Control
System
LSB Card Cage
Power System

Cooling System

Plug-In Units

BXB-0021H-92

1-2 Configuration Rules

About the Main Cabinet
The main cabinet, H9F00–AA/AB/AC, contains the following components:
•

Cabinet control system

•

LSB card cage with processor, memory, and IOP modules

•

Power and cooling systems

•

One or more plug-in units for:
— I/O
— Disks
— Batteries

A removable media device (RRD421 in DEC 7000 systems; TF85 in
VAX 7000 systems) is optional. If used, it is mounted next to the control
panel in the main system cabinet.

Variants of the main cabinet are listed in Table 1-1.

Table 1-1 Main Cabinet Variants
Part Number

Regulator

H9F00–AA

120/208 V, 60 Hz

H9F00–AB

220-240/380-415 V, 50 Hz

H9F00–AC

202 V, 50-60 Hz

1 The RRD42 requires a dedicated KZMSA port in an XMI plug-in unit in the main cabinet.

Configuration Rules 1-3

1.2 Expander Cabinet
The expander cabinet looks like the main cabinet, but without an
LSB card cage or a control panel. Disk plug-in units may be installed in the space that would be occupied by the LSB card cage.

Figure 1-2

Expander Cabinet

Front

Disk Plug-In Units

Rear

Power System

Cooling System

Plug-In Units

BXB-0032J-92

1-4 Configuration Rules

About the Expander Cabinet
The expander cabinet, H9F00–BA/BB/BC, is similar to the main cabinet.
The second letter of each variant identifies voltage (see Table 1-1 for these
voltages).
The expander cabinet frame is identical to the main cabinet; the contents,
however, differ. The expander cabinet does not have an LSB card cage or a
control panel, and it can have disk plug-in units in the upper part of the
cabinet.
Expander Cabinet Configuration Rules
•

Each system may have a maximum of two expander cabinets. The first
expander cabinet is placed to the right of the system cabinet and the
second to the left. See Figure 1-3.

•

The expander cabinet may contain a removable media device (RRD421
in DEC 7000 systems; TF85 in VAX 7000 systems). If used, it is located
in the front of the expander cabinet, at the top.

•

The configuration rules for the lower quadrants of the system cabinet
also apply to the lower quadrants of the expander cabinet.

•

The only plug-in units that may be installed in the upper quadrants of
the expander cabinet are disk plug-in units.

Figure 1-3

System With Two Expander Cabinets (Front View)

Second
Expander
Cabinet

Main
Cabinet

First
Expander
Cabinet

BXB-0001M-92

1 The RRD42 requires a dedicated KZMSA port in an XMI plug-in unit in the same expander
cabinet.

Configuration Rules 1-5

1.3 Power System
The power system consists of the AC input box, DC distribution
box, and power regulators. This section includes configuration information for power regulators.

Figure 1-4

Power System

Front

Rear

Power
Regulators

AC Input Box
DC Distribution Box

BXB-0052E-92

1-6 Configuration Rules

About the Power System
•

The power system consists of the AC input box, DC distribution box,
and a minimum of one and a maximum of three power regulators. (See
Figure 1-4.)

•

The maximum system configuration requires two regulators; the third
is for optional redundant power.

•

Power regulators cannot be warm swapped.

•

Each plug-in unit (with the exception of the battery plug-in unit) has a
local power supply that generates the needed +5V and other miscellaneous DC voltages.

Power Regulator Configuration
When viewed from the front of the system cabinet, the leftmost power
regulator (closest to the LSB card cage) corresponds to phase A, the middle
with phase B, and the rightmost with phase C (see Figure 1-4). Power
regulators are configured in manufacturing starting closest to the LSB
card cage and working to the right.
This platform, with one regulator installed, constitutes a true single-phase
load. The load currents in three-phase power distribution need to be balanced. If necessary, reconfigure the regulators (and batteries, if the cabinet
contains a battery plug-in unit) in multiple-system installations to balance
the three-phase currents and to reduce stresses in the common neutral
conductor.

Configuration Rules 1-7

1.4 LSB Card Cage
The LSB card cage contains nine module slots. The minimum configuration is a processor module in slot 0, a memory module in slot
7, and the I/O port module in slot 8. This section gives placement
rules for other configurations.

Figure 1-5

LSB Card Cage (Top View)

Front

Rear

Power Filter

Additional CPUs
or Memories
First CPU

Additional
Memories
or CPUs

First Memory

IOP Module

Centerplane
BXB-0094C-92

Table 1-2 Memory Module Placement
Number of
Processor
Modules

Memory Module:
1st

2nd

3rd

4th

5th

6th

7th

—

*Insert these processor modules after all memory modules have been inserted.

1-8 Configuration Rules

About the LSB Card Cage
•

The LSB card cage has slots for nine modules. These modules are a
combination of processor (KN7AA–AA or KA7AA-AA), memory
(MS7AA–AA, –BA, –CA, –DA), and I/O port (IOP, E2044–AA) modules.

•

The maximum number of processor modules is six.

•

The maximum number of memory modules is seven. Memory modules
may reside in slots 1 through 7 only.

•

The maximum amount of memory in a DEC 7000 system is 14 Gbytes;
in a VAX 7000 system it is 3.5 Gbytes. Memory module sizes are 64
Mbyte (MS7AA–AA), 128 Mbyte (MS7AA–BA), 256 Mbyte (MS7AA–
CA), and 512 Mbyte (MS7AA–DA). All but the 64-Mbyte module support two-way interleaving. Mixed sizes of memory modules may be installed in the LSB card cage.

•

Each system must have one IOP module, which must reside in slot 8.

•

The minimum configuration is one processor module, one memory
module, and one IOP module. In this configuration, the processor module must reside in slot 0 and the memory module in slot 7.

Module Placement Rules
Due to the speed of the LSB bus, these rules must be followed. The goal is
to keep all modules as close together as possible. This is best accomplished
by alternating memory modules between the front and rear of the card
cage.
Configure modules in this order:
1.

Check that the IOP module is in slot 8.

Place the first four processor modules starting in slot 0 through slot 3.

Next configure memory modules as shown in Table 1-21.

Insert any remaining processor modules in open slots with the highest
node ID numbers. (The node ID number is the same as the slot number.)

Install filler modules in any unused slots to ensure proper airflow.

1 Table 1-2 shows the slot in which each memory module is installed depending on the number of processor modules in the system. For example, if the system contains two processor
modules and three memory modules, the first memory module is installed in slot 7, the second in slot 6, and the third in slot 2.

Configuration Rules 1-9

1.5 I/O Interface
The I/O interface consists of the IOP module in the LSB card cage
and the I/O cables, which connect the IOP module to the I/O bus.

Figure 1-6

I/O Interface

Rear
Expander

Rear
Main
IOP Module
I/O Cable

BXB-0032L-92

1-10 Configuration Rules

About the I/O Interface
The I/O interface consists of the I/O port (IOP) module in slot 8 of the LSB
card cage and two unidirectional cables for each I/O channel. The IOP
module can accommodate a maximum of four I/O channels.
I/O Interface Configuration
•

Each system must have an IOP module.

•

The IOP module can accommodate one to four I/O channels.

•

Each I/O bus is housed in a plug-in unit (PIU).

•

An I/O cable connects the IOP module to an I/O PIU.

•

The maximum length of each I/O cable is 3 meters (10 feet).

•

Each I/O cable consists of two separate unidirectional interconnects.

Configuration Rules 1-11

1.6 Plug-In Units
Plug-in units (PIUs) are located in the main and expander cabinets as shown in Figure 1-7. Both cabinets have space for PIUs in
the bottom. The expander cabinet also has PIU quadrants in the
top.

Figure 1-7

Location of PIU Quadrants

Front

Main Cabinet

Rear

PIU
Quadrant 3

PIU
Quadrant 1

PIU
Quadrant 2

PIU
Quadrant 4

Front

Expander Cabinet

Rear

PIU
Quadrant 5

PIU
Quadrant 1

PIU
Quadrant 6

PIU
Quadrant 3
PIU
Quadrant 4

PIU
Quadrant 2
BXB-0044K-92

1-12 Configuration Rules

About Plug-In Units
•

Plug-in units (PIUs) house options in the main and expander cabinets.

•

These options are housed in PIUs:
— XMI
— VAXBI
— Futurebus+
— SCSI disks and tapes
— DSSI disks
— Batteries

•

PIUs are located in the PIU quadrants, as shown in Figure 1-7. The
main cabinet has four PIU quadrants, and the expander cabinet has
six.

•

The XMI, VAXBI, and battery PIUs each require two quadrants; the
Futurebus+ and disk PIUs each require one quadrant.

Configuration rules for each of these PIUs are discussed in the following
sections.

Configuration Rules 1-13

1.6.1 XMI Plug-In Unit
The XMI PIU houses an XMI card cage and power regulators. The
XMI PIU is located in the bottom of the main cabinet or expander
cabinet.

Figure 1-8

XMI Plug-In Unit

BXB-0368-92

1-14 Configuration Rules

About the XMI Plug-In Unit
•

An XMI PIU is shown in Figure 1-8.

•

The maximum number of XMI PIUs per cabinet is two. The maximum
per system is four.

XMI PIU Configuration Rules
•

Each XMI PIU occupies two quadrants (Q1 and Q2 or Q3 and Q4 —
see Figure 1-7). When the cabinet includes a VAXBI PIU, the XMI PIU
must be in quadrants Q1 and Q2.

•

The total number of dual I/O panels on the XMI bulkhead is 20. One of
these is used for the I/O cable from the IOP module.

XMI Configuration Rules
•

Each XMI backplane has 12 slots of usable I/O space. The backplane
has 14 slots, two of which are reserved for the T2030–YA and T2028–
YA modules, leaving 12 slots for I/O.

•

The clock and arbitration module (T2030–YA) must reside in slot 7.

•

The T2028–AA module, which is the interface between the LSB and
XMI buses, must reside in slot 8.

•

The first option must reside in either slot 1 or slot 14 to terminate the
XMI bus. If the option is a two-module set, the module with the XMI
corner must be in slot 1 or slot 14.

•

If the cabinet has a VAXBI PIU, the T2018 module (XBIA+) must reside in slot 1 of the XMI backplane.

Configuration Rules 1-15

1.6.2 VAXBI Plug-In Unit
The VAXBI PIU houses a VAXBI card cage and power regulators.
The VAXBI PIU is located in the bottom of the main cabinet or expander cabinet.

Figure 1-9

VAXBI Plug-In Unit

BXB-0368A-92

1-16 Configuration Rules

About the VAXBI Plug-In Unit
•

A VAXBI PIU is shown in Figure 1-9.

•

The maximum number of VAXBI PIUs per cabinet is one. The maximum per system is three (assuming a main cabinet and two expander
cabinets).

VAXBI PIU Configuration Rules
•

The VAXBI PIU occupies two quadrants (Q3 and Q4 — see Figure 1-7).

•

An XMI PIU must reside in the same cabinet as a VAXBI PIU, in
quadrants Q1 and Q2.

VAXBI Configuration Rules
•

Each VAXBI backplane has 11 slots of usable I/O space.

•

The T1043 module (XBIB) must reside in slot 12 of the VAXBI
backplane; the T2018 module (XBIA+) must reside in slot 1 of the XMI
backplane.

Configuration Rules 1-17

1.6.3 Futurebus+ Plug-In Unit
The Futurebus+ PIU houses a Futurebus+ card cage and
DEC power regulators. The Futurebus+ PIU is located in the
7000
bottom of the main cabinet or expander cabinet.

Figure 1-10 Futurebus+ Plug-In Unit

BXB-0368B-92

1-18 Configuration Rules

About the Futurebus+ Plug-In Unit
•

A Futurebus+ PIU is shown in Figure 1-10.

•

The maximum number of Futurebus+ PIUs per cabinet is two. The
maximum number per system is three.

Futurebus+ Configuration Rules
•

Each Futurebus+ PIU occupies one quadrant (Q2 or Q4 — see Figure
1-7).

•

The B2003–AA module must reside in slot 5 of the Futurebus+ card
cage.

•

The system must include an XMI bus.

Configuration Rules 1-19

1.6.4 SCSI Disk and Tape Plug-In Unit
The SCSI disk and tape PIU houses any combination of 3.5DEC inch disk and tape drives and 5.25-inch disk drives. This
7000
PIU is located in the bottom of the main cabinet or in the
top or bottom of the expander cabinet.

Figure 1-11 SCSI Disk and Tape Plug-In Unit

BXB-0369A-92

1-20 Configuration Rules

About the SCSI Disk and Tape Plug-In Unit
•

The maximum number of SCSI disk and tape PIUs is two in the main
cabinet and four in the expander cabinet.

•

Each SCSI disk PIU contains two shelves. Each shelf contains seven
slots for disks and tapes, in any combination.

•

Each 3.5-inch disk or tape uses one slot:
— RZ26–VA disk
— TLZ06–VA tape

•

Each 5.25-inch disk uses three slots:
— RZ73–VA disk

SCSI Disk and Tape PIU Configuration Rules
•

The SCSI disk PIU can occupy any quadrant (see Figure 1-7).

•

The arrow on the rear panel of the PIU enclosure must point toward
the blower. That is, the arrow must point up if the PIU is in Q1
through Q4; it must point down if the PIU is in Q5 or Q6.

Configuration Rules 1-21

1.6.5 DSSI Disk Plug-In Unit
The DSSI disk PIU houses one to three bricks; each brick
VAX contains two 5.25-inch disk drives. This PIU is located in
7000
the bottom of the main cabinet or in the top or bottom of
the expander cabinet.

Figure 1-12 DSSI Disk Plug-In Unit

Brick

BXB-0359A-92

1-22 Configuration Rules

About the DSSI Disk Plug-In Unit
•

The maximum number of DSSI disk PIUs is two in the main cabinet
and four in the expander cabinet.

•

Each DSSI disk PIU contains a minimum of one and a maximum of
three bricks; each brick contains two 5.25-inch form factor disks.

DSSI Disk PIU Configuration Rules
•

The DSSI disk PIU can occupy any quadrant (see Figure 1-7).

•

In the system cabinet or in the bottom of the expander cabinet, bricks
are installed starting closest to the blower and working down.

•

In the top of the expander cabinet, bricks are installed starting closest
to the blower and working up.

•

The arrow on the rear panel of the PIU enclosure must point toward
the blower. That is, the arrow must point up if the PIU is in Q1
through Q4; it must point down if the PIU is in Q5 or Q6.

Configuration Rules 1-23

1.6.6 Battery Plug-In Unit
The battery PIU houses one to three battery blocks; each block
contains four batteries. The battery PIU is located in the bottom
of the main cabinet or expander cabinet.

Figure 1-13 Battery Plug-In Unit

Block A

Block B

Block C

BXB-0367-92

1-24 Configuration Rules

About the Battery Plug-In Unit
•

The maximum number of battery PIUs is one in the main cabinet and
one in each expander cabinet.

•

Each battery PIU contains a minimum of one and a maximum of three
blocks of batteries. Each block contains four batteries.

•

One block of batteries is required for each power regulator in the cabinet.

Battery PIU Configuration Rules
•

The battery PIU occupies two quadrants, Q3 and Q4 (see Figure 1-7).

•

The battery block labeled A in Figure 1-13 is in the rear when the battery PIU is installed in the cabinet. It consists of two batteries in the
top tray and two batteries in the bottom. Battery block B is in the front
when the PIU is installed in the cabinet. It consists of four batteries in
the top tray. Battery block C is also in the front; it consists of four batteries in the bottom tray.

•

Battery block A corresponds to power regulator A (see Figure 1-4), battery block B to power regulator B, and battery block C to power regulator C.

•

If you reconfigure the power regulators (see page 1-9), you must also
reconfigure the batteries.

Configuration Rules 1-25

Chapter 2
Cabinet Doors and Panels
This chapter contains the following sections:
•

Door and Cable Cover Removal and Replacement

•

Top Panel and Air Filter Removal and Replacement

•

Side Panel Removal and Replacement

Cabinet Doors and Panels 2-1

2.1 Door and Cable Cover Removal and
Replacement
Replace the doors and cable cover only if they sustain cosmetic
damage. The front and rear doors attach to the cabinet with
spring-loaded latch pins; the cable cover attaches with quarterturn Phillips screws.

Figure 2-1

Cabinet Door and Cable Cover

2
Rear

3
1
BXB-0398-92

2-2 Cabinet Doors and Panels

Door Removal
1.

Open the door.

Locate the spring-loaded latch in the upper corner of the door. See 2
in Figure 2-1. Pull the pin down.

Lift the bottom of the door off the hinge pin. See 3 .

Door Replacement
Reverse steps 1–3 in the Removal section above.

Cable Cover Removal
1.

Remove the two screws (quarter-turn Phillips) — one in each of the
upper corners of the cable cover. See 1 in Figure 2-1.

Swing the cable cover down and remove it from the hinges on the bottom.

Cable Cover Replacement
Reverse steps 1–2 in the Removal section above.

Cabinet Doors and Panels 2-3

2.2 Top Panel and Air Filter Removal and
Replacement
The top panel attaches to the cabinet with one Phillips screw and
four plastic snaps. Remove the top cover to gain access to some
field replaceable units or to replace the top air filter.
CAUTION: Obstructions on the top panel may cause the system to shut
down.

Figure 2-2

Top Panel

1
Rear

BXB-0398A-92

2-4 Cabinet Doors and Panels

Top Panel Removal
1.

Remove the screw (Phillips) at the rear of the top panel. See 1 in Figure 2-2.

Lift the top panel until the plastic snaps disengage.

Top Panel Replacement
1.

Position the top panel on the cabinet and push it down until the plastic snaps engage.

Replace the screw removed in step 1 of the Removal section.

Top Air Filter Removal
1.

Remove the top panel (see above).

Grasp the foam air filter and pull it away from the top panel. No tools
are required.

Discard the foam air filter.

Top Air Filter Replacement
1.

Lay the replacement air filter over the mesh on the top panel.

Push the edges of the foam under the edges of the opening.

Replace the top panel.

Cabinet Doors and Panels 2-5

2.3 Side Panel Removal and Replacement
The side panel attaches to the cabinet with two bolts at the top
and brackets on the inside of the panel.

Figure 2-3

Side Panel

1
BXB-0335B-92

2-6 Cabinet Doors and Panels

Removal
1.

Remove the top panel. See Section 2.2.

Use a 10 mm hex socket wrench to remove the bolts in the upper corners of the side panel. See 2 in Figure 2-3.

Lift the panel up and away from the cabinet.

Replacement
1.

Place the panel on the side of the cabinet so that all three brackets on
the inside of the side panel rest in the U-shaped channels on the side
of the cabinet. See 1 in Figure 2-3.

Replace the bolts removed in step 2 of the Removal section.

Replace the top panel.

Cabinet Doors and Panels 2-7

Chapter 3
Cabinet Control System
This chapter contains the following sections:
•

Control Panel Removal and Replacement

•

Removable Media Device Removal and Replacement

•

Local Disk Converter Removal and Replacement

•

Cabinet Control Logic Module Removal and Replacement

•

Pressure Sensor Removal and Replacement

Cabinet Control System 3-1

3.1 Control Panel Removal and Replacement
The control panel bezel attaches to the cabinet with two Phillips
screws. The circuit board attaches to the back side of the bezel
with four clips. Access is from the front of the cabinet.

Figure 3-1

Control Panel

Disable
Secure
Enable

Left Expander

Restart

Key On

Front

Right Expander

Run
Fault
Console

4
5
7
7
Back side of
control panel

7
5

BXB-0370-92

3-2 Cabinet Control System

Removal
1.

Turn the keyswitch to Disable. Remove the key.

Shut the circuit breaker off by pushing down the handle.

Open the front door of the cabinet.

Remove the two screws (Phillips) on the left side of the control panel.
See 4 in Figure 3.1.

Swing the panel to the right no more than two inches and remove it
from the hinges. See 5 .

Disconnect the cables from the circuit board.

Place the control panel face down on a flat surface. Remove the circuit
board by easing the clips away from the board and pulling the board
up. See 7 .

Replacement
•

Reverse the steps in the Removal procedure above.

Cabinet Control System 3-3

3.2 Removable Media Device Removal and
Replacement
The removable media device is housed in a box mounted on rails
in the cabinet. Slotted captive screws hold the box in the cabinet;
Phillips screws attach the top to the box and the removable media
device to the box. Access is from the front of the cabinet.

Figure 3-2

Removable Media Device

7
Front

8
5
BXB-0371-92

3-4 Cabinet Control System

Removal
1.

Turn the keyswitch to Disable.

Open the rear door of the cabinet and shut the circuit breaker off by
pushing down the handle.

Remove all cable connectors from the rear of the removable media box.

Remove the control panel. See Section 3.1.

Loosen the two captive screws (slotted) at the lower sides of the removable media box. See 5 in Figure 3-2.

Slide the removable media box out of the cabinet and place it on a stable work surface.

Remove the top cover of the removable media box by removing the
nine screws (Phillips) and lifting the cover off. See 7 .

Remove the four screws (Phillips) that hold the removable media device in place. There are two screws on each side of the box. See 8 .

Slide the removable media device out of the box.

10. Remove the cable connectors from the rear of the adapter board that is
in the bottom of the box, under the removable media device.
11. Push down on the two clips that hold the rear of the adapter board and
remove the board.
Replacement
•

Reverse the steps in the Removal procedure above.

Cabinet Control System 3-5

3.3 Local Disk Converter Removal and
Replacement
The local disk converter (LDC) is housed in the removable media
box (Section 3.2). Phillips screws attach the circuit board to the
box. Access is from the front of the cabinet.

Figure 3-3

Local Disk Converter

Front

5
BXB-0371A-92

3-6 Cabinet Control System

Removal
1.

Turn the keyswitch to Disable.

Open the rear door of the cabinet and shut the circuit breaker off by
pushing down the handle.

Remove all cable connectors from the rear of the removable media box.

Remove the control panel. See Section 3.1.

Loosen the two captive screws (slotted) at the lower sides of the removable media box. See 5 in Figure 3-3.

Slide the removable media box out of the cabinet and place it on a stable work surface.

Remove the top cover of the removable media box by removing the
nine screws (Phillips) and lifting the cover off. See 7 .

Disconnect the four cables from the local disk converter module. See
8.

Remove the local disk converter module by removing the four screws
(Phillips) from the corners of the module. Use a long screwdriver, and
insert it through the holes on the side of the removable media box opposite the local disk converter module.

Replacement
•

Reverse the steps in the Removal procedure above.

Cabinet Control System 3-7

3.4 Cabinet Control Logic Module Removal and
Replacement
The cabinet control logic (CCL) module is mounted on a slide
plate with Phillips screws. The slide plate is held in place with
slotted captive screws. Access is from the rear of the cabinet.

Figure 3-4

Front

Cabinet Control Logic Module (Viewed from Front of
Cabinet)

BXB-0363-92

3-8 Cabinet Control System

Removal
1.

Turn the keyswitch to Disable.

Shut the circuit breaker off by pushing down the handle.

Ground yourself to the cabinet with the antistatic wrist strap from the
Electrical Safety Kit.

At the rear of the system, remove the rear panel of the cabinet control
system box. See 4 in Figure 3-4.

If a DEC power bus cable is connected to the end of the slide plate on
which the cabinet control logic module is mounted, remove the connector. See 5 .

Remove all connectors from the cabinet control logic module.

Disconnect the plastic hose from the pressure sensor. See 7 .

Loosen the two captive screws (slotted) on the end of the slide plate.
See 8 .

Pull the slide plate out.

10. Remove the cabinet control logic module from the slide plate by removing the six screws (Phillips) that are in the corners and the center of
each long side.
Replacement
•

Reverse the steps in the Removal procedure above. Reattach the plastic hose (disconnected in step 7 above) to the outlet of the pressure sensor that faces away from the module.
IMPORTANT: The system will not power up completely if this hose is
left unattached.

Cabinet Control System 3-9

3.5 Pressure Sensor Removal and Replacement
The pressure sensor is mounted on the CCL module (Section 3.4).
Access is from the rear of the cabinet.

Figure 3-5

Pressure Sensor Location (Viewed from Front of
Cabinet)

3
Front

Air Pressure
Sensor

BXB-0044L-92

3-10 Cabinet Control System

Removal
1.

Remove the cabinet control logic module. See Section 3.4.

On the back side of the cabinet control logic module, remove the two
screws (slotted) that hold the pressure sensor in place.

Disconnect the two spade lugs from the side of the pressure sensor.
See 3 in Figure 3-5.

Replacement
•

Reverse the steps in the Removal procedure above.

Cabinet Control System 3-11

Chapter 4
Power and Cooling Systems
This chapter contains the following sections:
•

Power Regulator Removal and Replacement

•

AC Input Box Removal and Replacement

•

DC Distribution Box Removal and Replacement

•

Blower Removal and Replacement

Power and Cooling Systems 4-1

4.1 Power Regulator Removal and Replacement
The power regulators attach to the cabinet with Phillips captive
screws. Access is from the front of the cabinet.
WARNING:

The power regulator has a heated surface on one side.

Figure 4-1

Power Regulators

Front

4
BXB-0064D-92

4-2 Power and Cooling Systems

Removal
1.

Turn the keyswitch to Disable.

Open the front and rear doors of the cabinet.

At the rear of the cabinet, shut the circuit breaker off by pushing down
the handle. To ensure that the circuit breaker is not unintentionally
switched on again, flip the lockout tag down. Lock the tag in place
with the padlock from the Electrical Safety Toolkit. Place the padlock
in the bottom hole of the bracket on either side of the tag. (See Section
4.2, step 4.)

From the front of the cabinet, loosen the two captive screws (Phillips),
one each at the top and bottom of the power regulator to be removed.
See 4 in Figure 4-1.
WARNING: One side of the power regulator is a heated surface. Do not
touch the side when removing the power regulator.
CAUTION: The power regulator weighs 20 kg (40.4 lb). Because of the
height of this unit in the cabinet, you should not remove the power
regulator from the cabinet by yourself.

Slide the power regulator out from the front of the cabinet. There will
be some resistance.

Replacement
1.

From the front of the cabinet, seat the replacement power regulator in
its slot and push it in as far as it will go without lifting the precharge
stop (see 1 in Figure 4-1). Wait 5 seconds, and then lift the precharge
stop and push the power regulator in the rest of the way.

Tighten the captive screws at the top and bottom of the power regulator.

Power and Cooling Systems 4-3

4.2 AC Input Box Removal and Replacement
The AC input box attaches to the cabinet with slotted captive
screws; the ground strap attaches to the AC input box with an 8
mm nut. Removal and replacement require access to both the
front and rear of the cabinet.

Figure 4-2

AC Input Box

7
Front

7
10

Rear

BXB-0374-92

4-4 Power and Cooling Systems

Removal
1.

Turn the keyswitch to Disable.

Open the front and rear doors of the cabinet.

At the rear of the cabinet, shut the circuit breaker off by pushing down
the handle.

To ensure that the circuit breaker is not unintentionally switched on
again, flip the lockout tag down. See 4 in Figure 4-2. Lock the tag in
place with the padlock from the Electrical Safety Toolkit. Place the
padlock in the bottom hole of the bracket on either side of the tag.

Disconnect the system power cord.

From the front of the cabinet, remove all power regulators and filler
modules. See Section 4.1 for power regulator removal. To remove any
filler modules, do the following:
a. Loosen the captive screws at the top and bottom of the filler module.
b. Grasp the handles and remove the filler module by sliding it forward.

Loosen the four captive screws on the front of the AC input box. See 7
(shown with power regulators removed).

At the rear of the cabinet, remove the ground strap at the AC input
box end (8 mm nut). See 8 .

Remove the right plastic cover from the DC distribution box (above the
AC input box).

10. Hold the AC input box to prevent it from falling. Pull the bracket attached to the DC distribution box up and push the bracket to the right
to hold it in place. See 10. (This bracket is partially obscured by the
left plastic cover on the DC distribution box. Do not remove this plastic cover.)
11. Remove the AC input box from the rear of the cabinet.
Replacement
•

Reverse the steps in the Removal procedure above.

Power and Cooling Systems 4-5

4.3 DC Distribution Box Removal and Replacement
The DC distribution box is installed in the cabinet with Phillips
screws. Connections to the assembly use 8 mm and 10 mm nuts.
Removal and replacement require access to both the front and
rear of the cabinet.

Figure 4-3

DC Distribution Box

Rear

Front

14
BXB-0373-92

4-6 Power and Cooling Systems

Removal
1.

Turn the keyswitch to Disable.

Open the front and rear doors of the cabinet.

Disconnect the system power cord.

From the front of the cabinet, remove the power regulators. See Section 4.1.

Remove the eight screws (Phillips) from the top and bottom flanges
(four each). See 6 in Figure 4-3.

From the rear of the cabinet, remove the AC input box. See Section
4.2.

If this cabinet has a battery plug-in unit, disconnect the two-pin connector in each block of batteries. See Section 8.1, steps 3 and 4.

At the rear of the cabinet, remove the plastic covers from the battery
terminals and the DC distribution bars. See 9 .

10. Remove all 48VDC connections (8 mm nuts). See 10 .
11. Disconnect any battery connections (10 mm nuts). See 11 .
12. If present, disconnect the battery sense cable. See 12 .
13. Disconnect the control/status cable. See 13 .
14. Remove the four flathead screws (Phillips) from the floor of the enclosure. See 14 .
15. Pull the DC distribution box out from the front.
Replacement
1.

Reverse the above steps. When reconnecting the 48 VDC and battery
connections (steps 10 and 11 above), torque the nuts to 2.5 newtonmeters (22 inch-pounds).

Check that battery connections (step 11 above) are correct.

Check that 48V connections (step 10 above) are correct.

Power and Cooling Systems 4-7

4.4 Blower Removal and Replacement
The blower attaches to the cabinet with Phillips screws. Removal
and replacement require two persons and access to the front and
rear of the cabinet.
WARNING:

The blower weighs 25 kg (55 lb).

Figure 4-4

Blower

Front

4
5

Rear

4-8 Power and Cooling Systems

BXB-0022B-92

Removal
1.

Turn the keyswitch to Disable.

Open the rear door of the cabinet. Shut the circuit breaker off by pushing down the handle. To ensure that the circuit breaker is not unintentionally switched on again, flip the lockout tag down. Lock the tag in
place with the padlock from the Electrical Safety Toolkit. Place the
padlock in the bottom hole of the bracket on either side of the tag. (See
Section 4.2, steps 3 and 4.)

Open the front door of the cabinet.

Remove the eight screws (Phillips) from the top and bottom blower
flanges (four each). See 4 in Figure 4-4.

Disconnect the 48V cable. See 5 .

Remove the four screws (Phillips) in the tabs protruding from the bottom of the blower box. See 6 .
WARNING: The blower weighs 25 kg (55 lb). Do not remove the blower
from the cabinet by yourself.

From the rear, push the blower assembly forward out of the cabinet 16
inches.

From the front of the cabinet and with one person on each side of the
blower, use the handholds on the sides of the box to grasp and pull the
blower assembly out the rest of the way. See 8 in Figure 4-4.

Replacement
1.

Apply silicone lubricant to the gaskets on the top and bottom surfaces
of the replacement blower.

Orient the replacement blower so that the handholds in the box are at
the bottom.

Reverse the steps in the Removal procedure above.

Power and Cooling Systems 4-9

Chapter 5
LSB Card Cage
This chapter contains the following sections:
•

I/O Cables Removal and Replacement

•

IOP Module Removal and Replacement

•

LSB Card Cage Removal and Replacement

NOTE: Removal and replacement instructions for processor and memory
modules can be found in the System Service Manual.

LSB Card Cage 5-1

5.1 I/O Cables Removal and Replacement
The I/O cables connect the IOP (E2044-AA) and DWLMA (T2028AA) or DWLAA (B2003-AA) modules. Each connection is a set of
two unidirectional cables. Each system has one to four sets of I/O
cables.

Figure 5-1 I/O Cable

Rear

BXB-0385-92

5-2 LSB Card Cage

Removal
1.

Turn the keyswitch to Disable.

Open the rear door of the cabinet.

Loosen the captive screws (slotted) to remove the cable connectors at
both ends of the I/O cable to be replaced. See 3 in Figure 5-1.

Replacement
1.

Attach the LSB end with pin 50 on top.

Route the replacement I/O cable through the same path as the original
one was routed.

Attach the bulkhead end. The connector is asymmetrical to ensure
proper orientation.

LSB Card Cage 5-3

5.2 IOP Module Removal and Replacement
The IOP module is held in the LSB card cage by two slotted
screws. Remove the I/O cables, then loosen the IOP screws alternately until the module is free of the connector.

Figure 5-2 Rear of LSB Card Cage Showing IOP Module

2
Rear

2
BXB-0375-92

5-4 LSB Card Cage

Removal
1.

Remove all I/O cables. See Section 5.1.

Loosen the top and bottom screws alternately (see 2 in Figure 5-2)
until the module is free of the connector. Do not loosen one screw completely before loosening the other. This keeps the module from binding
in the card guides.

Slide the module from the card cage.

Replacement
1.

Slide the module into slot 8 of the card cage. Slide it toward the
centerplane until you feel resistance.

Using a flat-blade screwdriver (minimum .3 inch wide), apply slight
inward pressure and turn the top screw until the threads are loosely
engaged. Repeat with the bottom screw.

Alternately tighten the screws. Do not tighten one completely before
tightening the other. Tighten until the connector seats or the torque
increases noticeably (maximum 20 inch-pounds).

Attach the I/O cables. See Section 5.1.

LSB Card Cage 5-5

5.3 LSB Card Cage Removal and Replacement
Remove all modules (front and rear), disconnect two cables from
the front of the card cage, and slide the cage out from the front.

Figure 5-3

Front

LSB Card Cage

Rear

13
10

5-6 LSB Card Cage

BXB-0376-92

Removal
1.

Turn the keyswitch to Disable.

Open the front door of the cabinet.

Open the rear door of the cabinet.

Ground yourself to the cabinet with the antistatic wrist strap from the
Electrical Safety Kit.

Turn off the circuit breaker.

Remove the ground strap from the card cage. Loosen the two screws at
the top and remove the card cage cover. See 6 in Figure 5-3.

Disconnect the I/O cables from the IOP module. See Section 5.1.

Note the locations of the modules in the card cage. Remove the modules. See Section 5.2 for removal instructions for the IOP module and
the System Service Manual for instructions for processor and memory
modules.

Remove the two screws (Phillips) on the side bracket. See 9 .

10. Remove the two screws (Phillips) on the bottom bracket. See 10 .
11. Disconnect the CCL cable. See 11 .
12. To detach the plastic cover over the power cables, loosen the three
nuts (8 mm — see 12 ) and squeeze the plastic cover to remove it from
the nuts. Do not try to remove it from the cables.
13. Remove the nuts (10 mm) connecting the power cables. See 13 .
14. Remove the three screws (Phillips) at the top and three at the bottom
of the card cage. See 14 .
CAUTION: Because of the height of the card cage in the cabinet, you
should not remove this assembly from the cabinet by yourself.
15. Slide the card cage assembly out from the front of the cabinet.
Replacement
Reverse the steps in the Removal procedure above. Wear an antistatic
wrist strap when working on this system.
When replacing the LSB card cage:
•

Be sure it is correctly seated on the air gaskets.

•

Torque the nuts (10 mm) that attach the power cables (removed in step
13 above) to 2.5 newton-meters (22 inch-pounds).

LSB Card Cage 5-7

Chapter 6
I/O Plug-In Units
This platform can house plug-in units for three I/O buses:
•

XMI

•

VAXBI

•

Futurebus+

The field-replaceable units in these three plug-in units are removed and
replaced in the same way, so only one set of instructions is given.
This chapter contains the following sections:
•

Power Regulator Removal and Replacement

•

Enclosure and Card Cage Removal and Replacement

•

Air Filter Cleaning

I/O Plug-In Units 6-1

6.1 Power Regulator Removal and Replacement
Disconnect the cables and loosen the three slotted captive screws
on the front of the regulator. Grasp the handhold and pull the
power regulator out of the enclosure.

Figure 6-1

I/O PIU Power Regulators

3
7
6
digital
INPUT VOLTAGE
48 VDC
INPUT CURRENT
28A MAX
MOD OK
OC
OT
OV
48V

INPUT VOLTAGE
48 VDC
INPUT CURRENT
5A MAX

MOD OK
OC
OT
OV
48V

RESET
V-OUT
DISABLE

BXB-0377-92

6-2 I/O Plug-In Units

NOTE: The following instructions apply to both power regulators.
Removal
1.

Turn the keyswitch to Disable.

Open the front door of the cabinet if you are working on an XMI or
VAXBI PIU; the rear door if Futurebus+ PIU.

Loosen the two spring-loaded Phillips fasteners and remove the enclosure door. See 3 in Figure 6-1.

Ground yourself to the cabinet with the antistatic wrist strap from the
Electrical Safety Kit.

Disconnect the 48V cable (two connectors). See 5 .

Disconnect the control and status cable (two connectors). See 6 .

Loosen the captive screws (slotted): one at the top and two at the bottom of each regulator. See 7 .

Using the handhold, pull out the power regulator. See 8 .
CAUTION: Do not bend or touch the connectors (power blades) at the
rear of the power regulator.

Place the power regulator on an ESD mat.

Replacement
To replace a power regulator, reverse the steps above. Wear an antistatic
wrist strap. The enclosure has a guide for the printed circuit board; be sure
the edge of the board is in the guide.
On power-up, check the controls and indicators on the power regulator:
•

The switch on the large regulator is in the Enable position.

•

The 48V LED is on when the system is initialized.

•

The MOD OK LED lights after power-up.

I/O Plug-In Units 6-3

6.2 Enclosure and Card Cage Removal and
Replacement
An XMI or VAXBI PIU occupies two quadrants, front to back. A
Futurebus+ PIU occupies one quadrant. Use a Phillips screwdriver to remove any of these PIUs.

Figure 6-2

I/O PIU Enclosure

6-4 I/O Plug-In Units

BXB-0377A-92

NOTE: The following procedure is for the front half of the XMI or VAXBI
enclosure. The rear half remains in the cabinet. This procedure is
for the entire Futurebus+ enclosure.
Removal
1.

Turn the keyswitch to Disable.

Open the front door of the cabinet if you are working on an XMI or
VAXBI PIU; the rear door if Futurebus+ PIU.

Loosen the two spring-loaded Phillips fasteners and remove the enclosure door. See 3 in Figure 6-2.

Ground yourself to the cabinet with the antistatic wrist strap from the
Electrical Safety Kit.
CAUTION: Hold the handle on the XMI card cage while removing or
inserting a module. If it is not held in place, the handle can spring
down and damage the module.

Remove all modules from the card cage. Store the modules in ESD
boxes or on ESD mats. Do not stack the modules.

Remove the power regulators. See Section 6.1.

Open the rear door of the cabinet.

Open the I/O bulkhead: pull up and twist the two door pins, and then
swing the bulkhead open.

Disconnect the Ethernet power cables from the bulkhead connectors.

10. Disconnect the I/O cables from the backplane.
11. At the front of the cabinet, remove the two screws (Phillips) at the bottom of the PIU enclosure. See 11 .
12. Loosen the two captive screws (slotted) at the top of the enclosure. See
12 .
13. Pull the enclosure out from the front of the cabinet (from the rear if
Futurebus+).
Replacement
1.

For XMI or VAXBI PIUs: Tightening the top captive screws compresses the EMI gasket between the front and rear halves of the enclosure. Inspect the EMI gasket before replacing the front half of the enclosure to determine that the gasket is not broken.

Reverse the steps in the Removal procedure above.

I/O Plug-In Units 6-5

6.3 Air Filter Cleaning
The air filter is located in the bottom of the I/O PIU enclosure
(front half). Clean it with a vacuum cleaner or a wire brush (preferably brass).

Figure 6-3

I/O PIU Air Filter

Air Filter
BXB-0378-92

6-6 I/O Plug-In Units

Air Filter Cleaning
1.

Turn the keyswitch to Disable.

Open the front door of the cabinet if you are working on an XMI or
VAXBI PIU; the rear door if Futurebus+ PIU.

Loosen the two spring-loaded fasteners (Phillips) and remove the PIU
enclosure door.

Slide the filter out.

Clean the filter with a vacuum cleaner or a wire brush (preferably
brass).

Replace the filter.

Replace the enclosure door.

Close the cabinet door.

I/O Plug-In Units 6-7

Chapter 7
Disk Plug-In Units
This chapter contains the following sections:
•

SCSI Disk and Tape Plug-In Unit
— Disk or Tape Removal and Replacement
— Power Supply Removal and Replacement
— Shelf Removal and Replacement
— Enclosure Removal and Replacement

•

DSSI Disk Plug-In Unit
— Local Disk Converter Removal and Replacement
— Remote Front Panel Removal and Replacement
— Disk Removal and Replacement
— Enclosure Removal and Replacement
— Power and Signal Harness Removal and Replacement

Disk Plug-In Units 7-1

7.1 SCSI Disk and Tape Plug-In Unit
The SCSI disk and tape plug-in unit is used only in DEC
DEC 7000 systems.
7000

7.1.1 Disk or Tape Removal and Replacement
Press both mounting tabs in and slide the disk or tape drive out of
the shelf. Use both hands to fully support the weight of the drive.

Figure 7-1

SCSI PIU Disks and Tapes

BXB-0362C-92

7-2 Disk Plug-In Units

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Press in both mounting tabs on the disk or tape drive. See 3 in Figure
7-2.

Using both hands to support the weight, slide the disk or tape drive
out of the shelf.

Replacement
1.

Insert the disk or tape drive in the guide slots.

Push the drive in until the mounting tabs lock in place.

Disk Plug-In Units 7-3

7.1.2 Power Supply Removal and Replacement
Disconnect the cable from the power supply. Press the mounting
tabs in and slide the power supply out of the shelf. Use both hands
to fully support the weight.

Figure 7-2

SCSI PIU Power Supply

7-4 Disk Plug-In Units

BXB-0362B-92

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Disconnect the input power cord from the power supply. See 3 in Figure 7-2.

Press in both mounting tabs on the power supply. See 4 .

Using both hands to support the weight, slide the power supply out of
the shelf.

Replacement
1.

Insert the power supply in the guide slots.

Push the power supply in until the mounting tabs lock in place.

Connect the input power cord.

Disk Plug-In Units 7-5

7.1.3 Shelf Removal and Replacement
Remove all storage devices and power supplies. Loosen the two
captive screws and slide the shelf out of the enclosure.

Figure 7-3

SCSI PIU Shelf

BXB-0386-92

7-6 Disk Plug-In Units

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the disks, tapes, and power supplies from the shelf. See Sections 7.1.1 and 7.1.2.

Loosen the two captive screws at the top of the shelf. See 4 in Figure
7-3.

Slide the shelf out of the enclosure.

Replacement
•

Reverse the steps in the Removal procedure above.

Disk Plug-In Units 7-7

7.1.4 Enclosure Removal and Replacement
Remove the shelves from the enclosure. Loosen the two slotted
captive screws at the top and remove the two Phillips screws at
the bottom of the enclosure. Slide the enclosure out. When replacing, check that the arrow on the rear panel points toward the
blower.

Figure 7-4

SCSI PIU Enclosure

7-8 Disk Plug-In Units

BXB-0387-92

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the shelves from the enclosure. See Section 7.1.3.

Loosen the two slotted captive screws at the top front of the enclosure.
See 4 in Figure 7-4.

Remove the two Phillips screws at the bottom front of the enclosure.
See 5 .

Slide the enclosure straight out of the cabinet.

Replacement
1.

Check that the arrow on the rear panel of the replacement enclosure
points toward the blower (see the inset in Figure 7-4). If it does not,
remove the 12 Phillips screws that attach the rear panel to the enclosure, turn the rear panel around, and reattach it to the enclosure.

Line up the rollers at the top of each side of the enclosure (see 2 ) with
the slides in the cabinet and push the enclosure straight into the cabinet until it seats.

Replace the bottom two Phillips screws and tighten the top two captive
screws.

Replace the shelves.

Disk Plug-In Units 7-9

7.2 DSSI Disk Plug-In Unit
The DSSI disk plug-in unit is used only in VAX 7000 sysVAX tems.
7000

7.2.1 Local Disk Converter Removal and Replacement
Pull the brick from the enclosure and remove the 13 Phillips
screws from the cover. The local disk converter module is attached to the underside of the brick cover by four Phillips screws.

Figure 7-5

DSSI PIU — Underside of Brick Cover Showing Local
Disk Converter

J3 J2

Local Disk Converter
Modules

7-10 Disk Plug-In Units

J3 J2

BXB-0365-92

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the disk brick from the enclosure by removing the screws in
the upper right and upper left corners and pulling the brick toward
you.

Set the disk brick on a stable work surface.

Remove the top cover of the disk brick. The cover is attached by nine
Phillips screws at the back (three on each side and three on the bottom) and two flathead Phillips screws in each channel on the sides of
the disk brick.

Remove all cable connectors from the local disk converter module (connectors J1, J2, J3, and J6 — see Figure 7-5).

Remove the four screws (Phillips) from the corners of the local disk
converter module.

Replacement
•

Reverse the steps in the Removal procedure above.

Disk Plug-In Units 7-11

7.2.2 Remote Front Panel Removal and Replacement
Pull the brick from the enclosure and remove the 13 Phillips
screws from the cover. The remote front panel module is attached
to the underside of the brick cover by six Phillips screws.

Figure 7-6

DSSI PIU — Underside of Brick Cover Showing
Remote Front Panel

Remote Front
Panel Module

J8
J2

BXB-0365A-92

7-12 Disk Plug-In Units

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the disk brick from the enclosure by removing the screws in
the upper right and upper left corners and pulling the brick toward
you.

Place the disk brick on a stable work surface.

Remove all cable connectors from the remote front panel module (J1
through J6 and J8 — see Figure 7-6).

With a pair of needle nose pliers, pull the switch buttons from the
front bezel. See 7 in Figure 7-6.

Remove the six screws (Phillips) that hold the remote front panel module in place.

Replacement
•

Reverse the steps in the Removal procedure above.

Disk Plug-In Units 7-13

7.2.3 Disk Removal and Replacement
Pull the brick from the enclosure and loosen the two slotted captive screws in the front bezel. Disconnect cables, press the latch
pin, and slide the disk drive from the brick.

Figure 7-7

DSSI PIU Disks

4
5
BXB-0366-92

7-14 Disk Plug-In Units

NOTE: These instructions apply to either drive in the brick.
Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the front bezel from the disk brick by loosening the captive
screw and pulling the bezel away from the brick. See 3 in Figure 7-7.

Remove the three cables from the connectors beneath the disk drive.
See 4 .

Press down the latch pin under the skid plate on the disk drive.
See 5 . Slide the disk drive forward.

Replacement
•

Reverse the steps in the Removal procedure above.

Disk Plug-In Units 7-15

7.2.4 Enclosure Removal and Replacement
Remove the bricks from the enclosure. Loosen the two slotted captive screws at the top and remove the two Phillips screws at the
bottom of the enclosure. Slide the enclosure out. When replacing,
check that the arrow on the rear panel points toward the blower.

Figure 7-8

DSSI PIU Enclosure

7-16 Disk Plug-In Units

BXB-0360-92

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the disk bricks from the enclosure by removing the screws in
the upper right and upper left corners of each brick and pulling each
brick toward you.

Loosen the two slotted captive screws at the top front of the enclosure.
See 4 in Figure 7-8.

Remove the two Phillips screws at the bottom front of the enclosure.
See 5 .

Slide the enclosure straight out of the cabinet.

Replacement
1.

Check that the arrow on the rear panel of the replacement enclosure
points toward the blower (see the inset in Figure 7-8). If it does not,
remove the 12 Phillips screws that attach the rear panel to the enclosure, turn the rear panel around, and reattach it to the enclosure.

Line up the rollers at the top of each side of the enclosure (see 2 ) with
the slides in the cabinet and push the enclosure straight into the cabinet until it seats.

Replace the bottom two Phillips screws and tighten the top two captive
screws.

Replace the disk bricks.

Disk Plug-In Units 7-17

7.2.5 Power and Signal Harness Removal and Replacement
Remove the enclosure from the cabinet. Remove the rear panel,
which is attached to the enclosure by 12 Phillips screws. Pull the
three plastic connectors straight out; remove the two Phillips
screws from the drawer connector and compress and push the
pins from the front.

Figure 7-9

DSSI PIU Power and Signal Harness

Detail of drawer
connector

Power pins

8
Detail of plastic connector

Sawtooth edge
BXB-0379-92

7-18 Disk Plug-In Units

Removal
1.

Turn the keyswitch to Disable.

Open the cabinet door.

Remove the disk bricks from the enclosure by pulling each brick toward you.

Loosen the two slotted captive screws at the top front of the enclosure.

Remove the two Phillips screws at the bottom front of the enclosure.

Pull the enclosure straight out of the cabinet.

Remove the rear panel of the enclosure, which is attached to the enclosure by 12 Phillips screws.

Remove the three plastic connectors at the rear of the enclosure by
pulling them straight out. See 8 in Figure 7-9. From the front of the
enclosure, compress the pins on one side of the plastic connector and
push them through the hole; repeat on the other side. Pull the connector out from the rear.

Remove the drawer connector (see 9 ) by removing the two Phillips
screws.

10. Pull the cable harness through the opening for the drawer connector.
Replacement
1.

Snake the replacement harness through the opening for the drawer
connector.

Position the drawer connector so that the side with the two large
power pins is to the left (see detail of drawer connector in Figure 7-9).
Attach the drawer connector with the two Phillips screws.

Insert the three plastic connectors in the openings in the rear of the
enclosure so that the sawtooth edge of each is at the bottom (see detail
of plastic connector). Push each connector into the opening until it
snaps in place.

Replace the rear panel of the enclosure. The arrow on the panel must
point toward the blower.

Slide the enclosure into the cabinet.

Replace the bottom two Phillips screws and tighten the top two captive
screws.

Replace the disk bricks.

Disk Plug-In Units 7-19

Chapter 8
Battery Plug-In Unit
This chapter contains the following sections:
•

Fuse Removal and Replacement

•

Cable Removal and Replacement

•

Battery Removal and Replacement

Battery Plug-In Unit 8-1

8.1 Fuse Removal and Replacement
Shut the circuit breaker off, padlock the lockout tag in place, and
break the main cable connection to the battery block in which you
are working. Remove the fuse cover and use the fuse puller to remove the fuse.

Figure 8-1

Battery PIU Fuse

Block B
Fuse B

4
Fuse C
Block A

Block C
Fuse A

8-2 Battery Plug-In Unit

BXB-0381-92

Removal
1.

Turn the keyswitch to Disable.

At the rear of the cabinet, shut the circuit breaker off by pushing down
the handle. To ensure that the circuit breaker is not unintentionally
switched on again, flip the lockout tag down. Lock the tag in place
with a padlock in the bottom hole of the bracket on either side of the
tag. (See Section 4.2, steps 3 and 4.)

Remove the appropriate panel of the battery plug-in unit. If you are
working in battery block A, open the rear door; if battery block B or C,
open the front door.

Break the main cable connection to the block of batteries in which you
are working. See 4 in Figure 8-1, which shows the location of the
main cable connection for battery block A. This connection is in a similar location for blocks B and C: next to the bottom half of the fuse.

Remove the fuse cover by removing the screw (Phillips) at the top of
the cover and pulling the cover toward you and down. See 5 .

Use the fuse puller from the Electrical Safety Kit to grip the fuse and
pull it out.

Replacement
1.

Position the cutout in the fuse contact over the rivet in one end of the
fuse holder. See 1 . Push the fuse into place.

Replace the fuse cover.

Connect the main cable connection to the battery block.

Close the door of the battery plug-in unit.

Battery Plug-In Unit 8-3

8.2 Cable Removal and Replacement
Remove the fuse for the battery block with which you are working
before removing the cable.

Figure 8-2

Battery PIU (Rear) Showing Cable Routing
17-03421-01
17-03494-02
17-03494-01
To Regulator A
17-03494-02
To Regulator B

17-03421-01
Block B
17-03493-01

17-03494-03
To Regulator C
17-03421-01
Block A

Fuse B

Fuse C

Fuse A

17-03493-01
17-03421-01
Block C
17-03494-01
17-03492-01

17-03494-03
BXB-0382-92

8-4 Battery Plug-In Unit

Removal
1.

Follow the procedure in Section 8.1 to remove the fuse.

Disconnect the cable and remove it. See the detail drawing of the cable
in Figure 8-2 for routing.

Replacement
1.

Snake the replacement cable through the channel in the side of the
cabinet.

Make all cable connections as shown in Figure 8-2.

If you are replacing the battery sense cable (17–03421–01), route it
along the power cable path to the appropriate battery block.

Replace the fuse. See the Replacement procedure in Section 8.1.

Battery Plug-In Unit 8-5

8.3 Battery Removal and Replacement
Remove the fuse for the battery block you are replacing. Then remove the battery hold-down bracket and the batteries. For blocks
B and C, remove the front batteries, then pull the tray out and tilt
it down to gain access to the rear batteries.

Figure 8-3

Battery Hold-Down Brackets

2
Block A

3
Block B or C

BXB-0383-92

8-6 Battery Plug-In Unit

Removal
1.

Follow the procedure in Section 8.1 to remove the fuse from the battery block in which you are working.

To remove the batteries in block A, remove the battery hold-down
bracket from the top pair of batteries (see 2 in Figure 8-3). Disconnect
the cables and remove the batteries. Repeat for the bottom pair of batteries.

To remove the batteries in block B or C, remove the battery hold-down
bracket from the pair of batteries closer to you (see 3 in Figure 8-3).
Disconnect the cables and remove the batteries. Then pull the tray out
and tilt it down until it locks in place. Remove the rear hold-down
bracket (see 3 in Figure 8-4), disconnect the cables, and remove the
batteries.

Replacement
•

Reverse the steps in the Removal procedure above.

Figure 8-4

Rear Batteries (Blocks B and C)

3
Block B

Block C
BXB-0384-92

Battery Plug-In Unit 8-7

Appendix A
Field-Replaceable Units
This appendix shows the location of all field-replaceable units (FRUs). It
contains the following sections:
•

FRUs Accessible from the Front of the Cabinet

•

FRUs Accessible from the Rear of the Cabinet

•

Platform Cables

•

FRUs in the XMI Plug-In Unit

•

FRUs in the VAXBI Plug-In Unit

•

FRUs in the Futurebus+ Plug-In Unit

•

FRUs in the SCSI Disk and Tape Plug-In Unit

•

FRUs in the DSSI Disk Plug-In Unit

•

FRUs in the Battery Plug-In Unit

Field-Replaceable Units A-1

A.1 FRUs Accessible from the Front of the Cabinet
Figure A-1 shows the location of field-replaceable units (FRUs)
that can be accessed from the front of the cabinet.

Figure A-1

Platform Cabinet (Front) Showing FRU Locations

or 8
4

Front

or 3

or 9

BXB-0021C-92

A-2 Field-Replaceable Units

70–28574–02

LSB centerplane and card cage1, 2

E2040–AA or
E2045–AA

DEC 7000 CPU module2
VAX 7000 CPU module2

E2043–AA or
E2043–BA or
E2043–CA or
E2046–AA

Memory module 64 Mbytes2, 3
Memory module 128 Mbytes2, 3
Memory module 256 Mbytes2, 3
Memory module 512 Mbytes2, 3

54–20306–01

Control panel2

30–33796–01 or
30–33796–02

Power regulator

12–35173–01

Blower1

DWLMA–xx4 or
DWMBB–LA

XMI plug-in unit1 (see page A-8)
VAXBI plug-in unit1 (see page A-10)

BA655–AA or
BA654–AA

SCSI disk plug-in unit3, 5 (see page A-14)
DSSI disk plug-in unit3, 5 (see page A-16)

H7237–AA

Battery plug-in unit1 (see page A-18)

4
5

1 Removal and replacement of this FRU requires access to both the front and the rear of the
cabinet.
2 This FRU is in the main cabinet only (cannot be located in the expander cabinet).
3 This FRU can be located in either the front or the rear of the cabinet.
4 Replace –xx with –AA if FRU is located in the main cabinet or with –BA if FRU is located
in the expander cabinet.
5 This FRU can be located in the bottom of the main cabinet or in the top or bottom of the
expander cabinet.

Field-Replaceable Units A-3

A.2 FRUs Accessible from the Rear of the Cabinet
Figure A-2 shows the location of field-replaceable units (FRUs)
that can be accessed from the rear of the cabinet.

Figure A-2

Platform Cabinet (Rear) Showing FRU Locations

5
Rear

or 11

7
8

10 11 or 12

BXB-0032F-92

A-4 Field-Replaceable Units

70–28574–02

LSB centerplane and card cage1, 2

E2044–AA

IOP module2

E2043–AA or
E2043–BA or
E2043–CA or
E2046–AA

Memory module 64 Mbytes2, 3
Memory module 128 Mbytes2, 3
Memory module 256 Mbytes2, 3
Memory module 512 Mbytes2, 3

54–20300–01

Cabinet control logic module (CCL)

54–36203–04

CCL pressure sensor

RRD42 or
TF85

Removable media device — DEC 7000 systems1
Removable media device — VAX 7000 systems1

30–35143–01

DC distribution box

30–33798–01 or
30–33798–02 or
30–33798–03

AC input box

12–35173–01

Blower1

DWLMA–xx4 or
DWMBB–LA or
DWLAA–xx4

XMI plug-in unit1 (see page A-8)
VAXBI plug-in unit1 (see page A-10)
Futurebus+ plug-in unit (see page A-12)

BA655–AA or
BA654–AA

SCSI disk plug-in unit3, 5 (see page A-14)
DSSI disk plug-in unit3, 5 (see page A-16)

H7237–AA

Battery plug-in unit1 (see page A-18)

7
8

9
10

Field-Replaceable Units A-5

A.3 Platform Cables
Figure A-3 shows the location of cables in the platform. The callouts point to cable ends.

Figure A-3

Platform Cabinet (Rear and Front) Showing Cables

3
10

2
4

6
10 11

15 16 17
4
7

5
8

BXB-0021D-92

A-6 Field-Replaceable Units

17–03118–01

48V LSB power (gray)

17–03118–02

48V LSB power (yellow)

17–03119–01*

48V power/signal to PIU

17–03127–01

48V to LDC

17–03126–01

48V power/sense to blower

17–03124–01

AC box to CCL signal

17–03120–01

Control panel to CCL signal

17–03123–01

LDC to CCL signal

17–03164–01

+5/+12 LDC to tape power

17–03121–01

CCL to LSB bulkhead signal

17–03122–01

LSB bulkhead to LSB backplane

17–03085–01

I/O cable, long (to expander cabinet — 114 in)

17–03085–02

I/O cable, short (53 in)

17–03201–01

DEC power bus

17–03348–01

DSSI bulkhead signal

17–03443–01

LDC bulkhead power

17–03444–01

LDC bulkhead signal

17–03511–01

Control panel to CCL in expander cabinet

* To remove this cable:
1. Remove the right side panel (as viewed from the front of the cabinet;
see Section 2.3).
2. Remove the screws on the strain relief clamps (visible from the side of
the cabinet).
3. Remove all ends of the cable. These ends are at the CCL module, the
DC distribution box, and the floating connector in each PIU quadrant.
You must remove all PIUs to gain access to the floating connectors
(see Chapters 6 through 8).

Field-Replaceable Units A-7

A.4 FRUs in the XMI Plug-In Unit
Figure A-4 shows the field-replaceable units (FRUs) in the XMI
plug-in unit.

Figure A-4

XMI Plug-In Unit (Front) Showing FRU Locations

3
8

2
1

BXB-0343-92

A-8 Field-Replaceable Units

70–30396–01

XMI backplane assembly

30–36010–01

Module A (power regulator)

30–36009–01

Module B (power regulator)

T2028–AA

DWLMA module (LSB to XMI — slot 8)

T2030–YA

Clock and arbitration module (slot 7)

These FRUs can reside in any1 XMI slot except 7 or 8:
T2020–00
T2027–00
T2080–YA
T2036–AA

XMI to NI controller
XMI to FDDI controller
XMI to CI controller
XMI to DSSI controller

If connecting to a VAXBI, this FRU must be in slot 1:
T2018

DWMBB/A XMI to VAXBI controller

17–03162–01

Signal cable

17–03163–01

48V power cable

17–03202–01

Power distribution cable (rear of PIU)

17–03416–01

+5VB jumper (rear of PIU)

17–03533–01

Bulkhead to XMI signal (rear of PIU)

1 A module with an XMI corner must be in slot 1 or 14. For more information, see Section
1.6.1.

Field-Replaceable Units A-9

A.5 FRUs in the VAXBI Plug-In Unit
Figure A-5 shows the field-replaceable units (FRUs) in the VAXBI
plug-in unit.

Figure A-5

VAXBI Plug-In Unit (Front) Showing FRU Locations

3
7

4
2
1

BXB-0343A-92

A-10 Field-Replaceable Units

70–24126–02

VAXBI backplane assembly

30–36010–01

Module A (power regulator)

30–36009–01

Module B (power regulator)

T1043

DWMBB/B module (XMI to VAXBI)

17–03162–01

Signal cable

17–03163–01

48V power cable

17–03202–01

Power distribution cable (rear of PIU)

Field-Replaceable Units A-11

A.6 FRUs in the Futurebus+ Plug-In Unit
Figure A-6 shows the field-replaceable units (FRUs) in the
DEC Futurebus+ plug-in unit.
7000

Figure A-6

Futurebus+ Plug-In Unit (Front) Showing FRU
Locations

4
2
1

BXB-0343B-92

A-12 Field-Replaceable Units

54–21662–01

Futurebus+ backplane assembly

30–36011–01

Module A2 (power regulator)

30–36009–01

Module B (power regulator)

B2003–AA

DWLAA module (LSB to Futurebus+ — slot 5)

Field-Replaceable Units A-13

A.7 FRUs in the SCSI Disk and Tape Plug-In Unit
Figure A-7 shows the field-replaceable units (FRUs) in the
DEC DSSI disk plug-in unit.
7000

Figure A-7

SCSI Disk Plug-In Unit (Front) Showing FRU Locations

4
BXB-0388-92

A-14 Field-Replaceable Units

RZ73–VA or
RZ26–VA or
TLZ06–VA

Disk drive 5.25-inch
Disk drive 3.5-inch
Tape drive 3.5-inch

BA350–LA

Shelf

H7430–AA

Shelf power supply

17–03532–01

Power and signal cable

Field-Replaceable Units A-15

A.8 FRUs in the DSSI Disk Plug-In Unit
Figure A-8 shows the field-replaceable units (FRUs) in the
VAX DSSI disk plug-in unit.
7000

Figure A-8

DSSI Disk Plug-In Unit (Front) Showing FRU Locations

2
5

4
10
5

Underside of brick cover

8
BXB-0345A-92

A-16 Field-Replaceable Units

SF73–LA

Disk brick

RF73–EA

Disk drive (two per brick)

Includes these FRUs:
54–19119–01
70–28814–01

RF73–EA ECM module
RF73 HDA

54–20868–01

Local disk converter (LDC)

54–21664–01

Disk control panel

17–03417–01

RF73 signal

17–03418–01

LDC power

17–03419–01

LDC signal

17–03420–01

RF73 power

17–03423–01

Disk control panel to bulkhead

17–03424–01

DSSI bus

17–02382–0x

DSSI brick jumper cable (BC21Q-xx)

17–03422–01

Signal and power

2 through 10 are in each brick.
11 connects the bricks to each other.
12 runs up the center rear of the PIU enclosure.

Field-Replaceable Units A-17

A.9 FRUs in the Battery Plug-In Unit
Figure A-9 shows the field-replaceable units (FRUs) in the battery
plug-in unit.

Figure A-9

Battery Plug-In Unit (Rear) Showing FRU Locations

Block B

3
5

3
2
6

4
1 Block C
1

Block A
BXB-0344-92

NOTE: The battery plug-in unit is shown in Figure A-9 without its enclosure.

A-18 Field-Replaceable Units

H7238–AA

Battery block (contains four 12–36168–02
batteries)

12–39982–01

Fuse (LPN–RK–90)

17–03421–01

Battery sensor cable

17–03492–01

Intermediate cable, battery block A

17–03493–01

Intermediate cable, battery block B or C

17–03494–01

Power regulator A to battery block A

17–03494–02

Power regulator B to battery block B

17–03494–03

Power regulator C to battery block C

Field-Replaceable Units A-19

Index
A

control panel, 3-2
local disk converter, 3-6
AC input box, 4-4, A-5
pressure sensor, 3-10
Air filter
removable media device, 3-4
I/O PIU, 6-6
Cables, A-6
top panel, 2-4
battery PIU, 8-4
Air pressure sensor, 3-10
DSSI PIU power and signal
harness, 7-18
B
Cable cover, 2-2
Battery plug-in unit, A-3, A-5, A-18 CCL, 3-8, A-5
batteries, 8-6
CD-ROM, 1-2, 3-4
cables, 8-4
Configuration rules
configuration rules, 1-24
battery PIU, 1-24
fuse, 8-2
DSSI disk PIU, 1-22
BA650. See battery plug-in unit
expander cabinet, 1-4
BA651. See XMI plug-in unit
Futurebus+ PIU, 1-18
BA652. See VAXBI plug-in unit
I/O interface, 1-10
BA653. See Futurebus+ plug-in
LSB card cage, 1-8
unit
main cabinet, 1-2
BA654. See DSSI disk plug-in unit
module placement, 1-8
BA655. See SCSI disk and tape
power system, 1-6
plug-in unit
SCSI disk and tape PIU, 1-20
Blower, 4-8, A-3, A-5
VAXBI PIU, 1-16
XMI PIU, 1-14
Control
panel, 3-2, A-3
C
CPU module, A-3
Cabinet
cable cover, 2-2
D
doors, 2-2
expander, 1-4
DC distribution box, 4-6, A-5
main, 1-2
Disk drive
side panel, 2-6
DSSI PIU, 7-14
top panel, 2-4
SCSI PIU, 7-2
Cabinet control logic module, 3-8,
Disk plug-in units. See DSSI disk
A-5
plug-in unit; SCSI disk and tape
Cabinet control system
plug-in unit
cabinet control logic module, 3-8
Doors, 2-2

Index-1

DSSI disk plug-in unit, A-3, A-5,
A-16
configuration rules, 1-22
disk drive, 7-14
enclosure, 7-16
local disk converter, 7-10
power and signal harness, 7-18
remote front panel, 7-12
DWLMA. See XMI plug-in unit
DWMBB-LA. See VAXBI plug-in
unit

E
Enclosure
DSSI PIU, 7-16
I/O PIU, 6-4
SCSI PIU, 7-8
Expander cabinet configuration
rules, 1-4

I/O port module, 1-8, 5-4, A-5

L
Local disk converter
in DSSI PIU brick, 7-10
in removable media device, 3-6
LSB card cage, 5-6, A-3, A-5
configuration rules, 1-8

M
Main cabinet configuration rules,
1-2
Memory module, A-3, A-5
placement rules, 1-8
Module placement rules, 1-9

N
Node ID, 1-9

Field-replaceable units
accessible from front, A-2
accessible from rear, A-4
Fuse, battery PIU, 8-2
Futurebus+ plug-in unit, 6-1, A-5,
A-12
air filter, 6-6
configuration rules, 1-18
enclosure, 6-4
power regulator, 6-2

Plug-in units
battery, 1-24, 8-1, A-3, A-5, A-18
DSSI disk, 1-22, 7-10, A-3, A-5,
A-16
Futurebus+, 1-18, 6-1, A-5, A-12
quadrant locations, 1-12
SCSI disk and tape, 1-20, 7-2,
A-3, A-5, A-14
VAXBI, 1-16, 6-1, A-10
XMI, 1-14, 6-1, A-3, A-5, A-8
Power regulator, 4-2, A-3
I/O PIU, 6-2
Power supply, SCSI PIU, 7-4
Power system
AC input box, 4-4
DC distribution box, 4-6
configuration rules, 1-6
power regulator, 4-2
Pressure sensor, 3-10, A-5
Processor module, A-3
placement rules, 1-9

H
H7237-AA. See battery plug-in unit

I
In-cabinet storage, 3-4
IOP module, 1-8, 5-4, A-5
I/O cables, 5-2
I/O interface
cables, 5-2
configuration rules, 1-10

Index-2

Q
Quadrant locations, 1-12

R
Remote front panel, DSSI PIU
brick, 7-12
Removable media device,1-2, 3-4,
A-5

S
SCSI disk and tape plug-in unit,
A-3, A-5, A-14
configuration rules, 1-20
disk drive, 7-2
enclosure, 7-8
power supply, 7-4
shelf, 7-6
tape drive, 7-2
Shelf, SCSI PIU, 7-6
Side panel, 2-6

T
Tape drive
removable media device, 1-2, 3-4
SCSI PIU, 7-2
Top panel, 2-4

V
VAXBI plug-in unit, 6-1, A-3, A-5,
A-10
air filter, 6-6
configuration rules, 1-16
enclosure, 6-4
power regulator, 6-2

X
XMI plug-in unit, 6-1, A-3, A-5, A-8
air filter, 6-6
configuration rules, 1-14
enclosure, 6-4
power regulator, 6-2

Index-3