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EK-A0511-MG-001

September 1992

144 pages

Original

2.8MB

Document:	MicroVAX 3100 Platform BA42-B Enclosure Maintenance
Order Number:	EK-A0511-MG
Revision:	001
Pages:	144
Original Filename:

OCR Text

MicroVAX 3100 Platform
BA42-B Enclosure Maintenance
Order Number: EK-A0511-MG.001

September 1992

This manual provides reference, installation, and maintenance information
for the BA42-B enclosure. The MicroVAX 3100 Model 40, Model 80, and
Model 90 systems use this enclosure.

Revision Information:

Digital Equipment Corporation
Maynard, Massachusetts

This is a revised manual.

September 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.
No responsibility is assumed for the use or reliability of software on 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.
All Rights Reserved.
The postpaid Reader’s Comments forms at the end of this document request your critical
evaluation to assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation: DEC, Digital, MicroVAX,
ThinWire, VAX DOCUMENT, VMS, and the DIGITAL logo.

This document was prepared using VAX DOCUMENT, Version 2.1.

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

1 Enclosure Description
1.1
Mass Storage Device Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
Controls, Indicators, Ports, and Connectors . . . . . . . . . . . . . . . . .
1.3
Power and Signal Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4
Air Circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5
Configuration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.1
Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.1.1
Model 40 Memory Configurations . . . . . . . . . . . . . . . . . .
1.5.1.2
Model 80 Memory Configurations . . . . . . . . . . . . . . . . . .
1.5.1.3
Model 90 Memory Configurations . . . . . . . . . . . . . . . . . .
1.5.2
Communications Options . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5.3
Mass Storage Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3
1–3
1–7
1–10
1–10
1–10
1–10
1–12
1–14
1–16
1–20

2 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
2.3
2.3.1
2.3.2
2.3.3
2.3.4

Preparing the Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature, Humidity, and Altitude Ranges . . . . . . . . . . . .
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the BA42-B System . . . . . . . . . . . . . . . . . . . . . . . . . . .
Placing the BA42-B Enclosure . . . . . . . . . . . . . . . . . . . . . . . .
Identifying the Ports and Connectors on the System Unit . . .
Connecting the Console Terminal . . . . . . . . . . . . . . . . . . . . . .
Connecting the ThinWire Terminator or Loopback
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1
2–1
2–2
2–3
2–3
2–3
2–3
2–5
2–5
2–7
2–7
2–7
2–7
2–10

iii

2.3.5
2.3.6

Connecting the System Unit Power Cord . . . . . . . . . . . . . . . .
Turning On the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–13
2–14

3 Removing and Replacing FRUs
Removing the Enclosure Cover . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing an MS44 or MS44L Memory Module . . . . . . . . . . . . . .
Removing an RZ-Series Disk Drive from the Upper
Drive-Mounting Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1
Separating the Support Plate from an RZ23L, RZ24, or
RZ24L Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.2
Separating the Mounting Bracket from an RZ25, RZ26, or
RZ35 Disk Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.3
Setting the SCSI ID on the Replacement Disk Drive . . . . . . .
3.4
Removing the Upper Drive-Mounting Shelf . . . . . . . . . . . . . . . . .
3.5
Removing an RZ-Series Disk Drive from the Lower
Drive-Mounting Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6
Removing the RX26 Diskette Drive Assembly . . . . . . . . . . . . . . .
3.6.1
Removing the RX26 FDI/SCSI Board . . . . . . . . . . . . . . . . . . .
3.6.2
Separating the RX26 Diskette Drive from the Mounting
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6.3
Setting the SCSI ID on the Replacement RX26 FDI/SCSI
Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7
Removing a TZ30 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.1
Separating the TZ30 Tape Drive from the Mounting
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7.2
Setting the SCSI ID on the Replacement TZ30 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8
Removing a TZK10 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.1
Separating the TZK10 Tape Drive from the Mounting
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.2
Setting the SCSI ID of the Replacement TZK10 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9
Removing a TLZ06 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.1
Separating the TLZ06 Tape Drive from the Mounting
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.2
Setting the SCSI ID and Option Switches of the Replacement
TLZ06 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10
Removing an RRD42 CD-ROM Drive . . . . . . . . . . . . . . . . . . . . . .
3.10.1
Separating the RRD42 CD-ROM Drive from the Mounting
Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10.2
Setting the SCSI ID on the Replacement RRD42 CD-ROM
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1
3.2
3.3

3–5
3–6
3–10
3–11
3–13
3–14
3–19
3–21
3–23
3–25
3–26
3–27
3–29
3–31
3–32
3–33
3–36
3–37
3–38
3–41
3–42
3–43
3–46
3–47

3.11
3.12
3.13
3.13.1
3.13.2
3.13.3
3.14
3.14.1
3.14.2
3.14.3
3.15
3.16
3.17

Removing the Upper and Lower Drive-Mounting Shelf
Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the SCSI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the DSW42 Synchronous Communications Option . . .
Removing the DSW42 Logic Board . . . . . . . . . . . . . . . . . . . .
Removing the DSW42 Input/Output Cable . . . . . . . . . . . . . .
Removing the DSW42 Input/Output Module . . . . . . . . . . . . .
Removing the DHW42 Asynchronous Communications
Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the DHW42 Logic Board . . . . . . . . . . . . . . . . . . . .
Removing the DHW42 Input/Output Cable . . . . . . . . . . . . . .
Removing the DHW42 Input/Output Module . . . . . . . . . . . . .
Removing the CPU Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing the CPU Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Supply Unit . . . . . . . . . . . . . . . . . . . . . . . .

3–48
3–51
3–54
3–55
3–56
3–57
3–58
3–59
3–60
3–61
3–63
3–67
3–70

A Pin Specifications for the Ports on the BA42-B System
B Recommended Spare Parts List
Glossary
Index
Figures
1–1
1–2
1–3
1–4
1–5
1–6
1–7
1–8
1–9
1–10
2–1

BA42-B Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controls, Indicators, Ports, and Connectors . . . . . . . . . . . . . .
Power Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Expansion Connectors on the KA45 CPU Module . .
Memory Expansion Connectors on the KA47 CPU Module . .
Memory Expansion Connectors on the KA50 CPU Module . .
Communications Options in Model 40 and Model 80
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communications Options in Model 90 Systems . . . . . . . . . . .
Mass Storage Device Combinations in the BA42-B
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BA42-B Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2
1–4
1–8
1–9
1–12
1–14
1–16
1–18
1–19
1–22
2–2
v

2–2
2–3
2–4
2–5
2–6
2–7
3–1
3–2
3–3
3–4
3–5
3–6
3–7
3–8
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

System Unit and Accessory Tray Contents . . . . . . . . . . . . . . .
Connecting the Console Terminal . . . . . . . . . . . . . . . . . . . . . .
Connecting the ThinWire Terminator to the System Unit . . .
Connecting the Standard Ethernet Loopback Connector to
the System Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . .
Turning On the System Unit . . . . . . . . . . . . . . . . . . . . . . . . .
Major FRUs in the BA42-B Enclosure . . . . . . . . . . . . . . . . . .
Removing the Enclosure Cover . . . . . . . . . . . . . . . . . . . . . . .
Memory Module Connectors on the KA45 or KA47 CPU
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Module Connectors on the KA50 CPU Module . . . . .
Removing a Memory Module . . . . . . . . . . . . . . . . . . . . . . . . .
Removing RZ-Series Disk Drives from the Upper
Drive-Mounting Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Separating the Support Plate from the Disk Drive . . . . . . . .
Separating the Mounting Bracket from the RZ25 Disk
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RZ23L Disk Drive SCSI ID Jumper Wire Locations . . . . . . . .
RZ24 Disk Drive SCSI ID Jumper Wire Locations . . . . . . . . .
RZ25 Disk Drive SCSI ID Jumper Wire Locations . . . . . . . . .
RZ26 Disk Drive SCSI ID Jumper Wire Locations . . . . . . . . .
RZ35 Disk Drive SCSI ID Jumper Wire Locations . . . . . . . . .
Removing the Upper Drive-Mounting Shelf . . . . . . . . . . . . . .
Removing an RZ-Series Disk Drive from the Lower
Drive-Mounting Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the RX26 Diskette Drive Assembly . . . . . . . . . . . .
Removing the RX26 FDI/SCSI Board . . . . . . . . . . . . . . . . . . .
Separating the Mounting Bracket from the RX26 Diskette
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location of the SCSI ID Switches on the RX26 FDI/SCSI
Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How to Reach the SCSI ID Switches on the RX26 FDI/SCSI
Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing a TZ30 Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . .
Separating the Mounting Bracket from the TZ30 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TZ30 SCSI ID Switch Locations . . . . . . . . . . . . . . . . . . . . . . .

2–6
2–9
2–11
2–12
2–14
2–15
3–4
3–5
3–7
3–8
3–9
3–11
3–12
3–14
3–15
3–16
3–17
3–18
3–19
3–21
3–23
3–25
3–26
3–27
3–28
3–29
3–30
3–32
3–33

3–24
3–25
3–26
3–27
3–28
3–29
3–30
3–31
3–32
3–33
3–34
3–35
3–36
3–37
3–38
3–39
3–40
3–41
3–42
3–43
3–44
3–45
3–46
3–47
3–48
A–1

Removing the TZK10 Tape Drive . . . . . . . . . . . . . . . . . . . . . .
Separating the Mounting Bracket from the TZK10 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locations of the SCSI ID Jumper Wires on the TZK10 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the TLZ06 Tape Drive . . . . . . . . . . . . . . . . . . . . . .
Separating the Mounting Bracket from the TLZ06 Tape
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locations of the SCSI ID and Option Switches on the TLZ06
Tape Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the RRD42 CD-ROM Drive . . . . . . . . . . . . . . . . . .
Separating the Mounting Bracket from the RRD42 CD-ROM
Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RRD42 SCSI ID Jumper Wire Locations . . . . . . . . . . . . . . . .
Removing the Upper and Lower Drive-Mounting Shelf
Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting the SCSI Cable . . . . . . . . . . . . . . . . . . . . . . . .
Separating the Upper Drive-Mounting Shelf from the Lower
Drive-Mounting Shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Releasing the SCSI Cable Clamp (Model 40 and Model 80
Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Releasing the SCSI Cable (Model 90 Only) . . . . . . . . . . . . . .
Removing the DSW42 Logic Board . . . . . . . . . . . . . . . . . . . .
Removing the DSW42 Input/Output Cable . . . . . . . . . . . . . .
Removing the DSW42 Input/Output Module . . . . . . . . . . . . .
Removing the DHW42 Logic Board . . . . . . . . . . . . . . . . . . . .
Removing the DHW42 Input/Output Cable . . . . . . . . . . . . . .
Removing the DHW42 Input/Output Module . . . . . . . . . . . . .
Disconnecting the Cables from the CPU Module . . . . . . . . . .
Removing the CPU Module . . . . . . . . . . . . . . . . . . . . . . . . . .
Location and Orientation of the Ethernet ID ROM for Models
40 and 80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location and Orientation of the Ethernet ID ROM for Model
90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removing the Power Supply Unit . . . . . . . . . . . . . . . . . . . . .
Pin Specifications for the Ports on the BA42-B System . . . . .

3–35
3–36
3–38
3–40
3–41
3–43
3–45
3–46
3–48
3–50
3–51
3–52
3–53
3–54
3–56
3–57
3–58
3–60
3–61
3–62
3–64
3–66
3–68
3–69
3–71
A–2

vii

Tables
1–1
1–2
1–3
1–5
1–5
1–6
1–7
1–8
2–1
2–2
2–3
3–1
A–1
A–2
A–3
A–4
B–1

viii

Functions of the Controls, Indicators, Ports, and
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Unit dc Outputs . . . . . . . . . . . . . . . . . . . . . . .
Memory Configurations for the Model 40 System . . . . . . . . .
Memory Configurations for the Model 80 System . . . . . . . . .
Memory Configurations for the Model 90 System . . . . . . . . .
BA42-B Communications Options . . . . . . . . . . . . . . . . . . . . .
DSW42-AA Communications Interface Support . . . . . . . . . . .
BA42-B Mass Storage Devices . . . . . . . . . . . . . . . . . . . . . . . .
Temperature, Humidity, and Altitude Ranges . . . . . . . . . . . .
BA42-B Electrical Requirements . . . . . . . . . . . . . . . . . . . . . .
Terminal Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Major FRUs in the BA42-B Enclosure . . . . . . . . . . . . . . . . . .
Asynchronous Port A and Port B Pin Specifications for the
Eight-Data and 16-Data Line Options . . . . . . . . . . . . . . . . . .
Asynchronous Port A and Port B Pin Specifications for the
Eight-Modem Control Line Option . . . . . . . . . . . . . . . . . . . . .
Pin Specifications for Synchronous Port 0 and Port 1 . . . . . .
Pin Specifications for the External SCSI Connector . . . . . . . .
Recommended Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–5
1–7
1–11
1–13
1–15
1–17
1–17
1–20
2–4
2–5
2–7
3–3
A–3
A–4
A–6
A–9
B–1

Preface
This manual provides the information that you need to maintain the BA42-B
enclosure. It contains physical information about the enclosure, installation
information, and procedures for replacing field replaceable units (FRUs).

Audience
This manual is for Digital™ Services personnel who provide support and
maintenance for systems that use this enclosure. It is also for customers who
have a self-maintenance agreement with Digital Equipment Corporation.
Readers of this manual must have experience of replacing hardware
components.

Structure of This Manual
This manual is divided into three chapters, two appendixes, a glossary, and an
index:
•

Chapter 1 provides an overview of the system enclosure and describes
the controls, mass storage areas and capacity, signal distribution, power
distribution, input and output connections, and configuration guidelines.

•

Chapter 2 provides site preparation information and describes how to
install the systems that use the enclosure.

•

Chapter 3 provides instructions on removing and replacing FRUs.

•

Appendix A gives the pin specifications for the ports on the back of the
system unit.

•

Appendix B gives a list of the recommended spare parts.

Associated Documents
The following documents contain additional maintenance information for
BA42-B enclosure systems:
•

Guide to MicroVAX™ 3100 Platform Maintenance Information Kit,
EK-A0512-MG

•

KA45 CPU System Maintenance, EK-A0513-MG

•

KA47 CPU System Maintenance, EK-A0514-MG

•

KA50 CPU System Maintenance, EK-Axxxx-MG

•

CPU Reference Information, EK-A0574-HR

•

Options, EK-A0519-MG
Note
Figures in this document apply to Models 40, 80, and 90 unless stated
otherwise.

Related Documents
The following documents contain more information about MicroVAX 3100
platform systems:

•

MicroVAX 3100 Model 40 and Model 80 Cover Letter, EK-A0517-CL

•

MicroVAX 3100 Model 40 and Model 80 Installation Information,
EK-A0523-IN

•

MicroVAX 3100 Model 40 and Model 80 Operator Information,
EK-A0524-UG

•

MicroVAX 3100 Model 40 and Model 80 Customer Technical Information,
EK-A0525-TD

•

MicroVAX 3100 Model 40 and Model 80 Troubleshooting and Diagnostic
Information, EK-A0518-TM

•

MicroVAX 3100 Model 90 Cover Letter, EK-A0517-CL

•

MicroVAX 3100 Model 90 Installation Information, EK-A0523-IN

•

MicroVAX 3100 Model 90 Operator Information, EK-A0524-UG

•

MicroVAX 3100 Model 90 Customer Technical Information, EK-A0525-TD

•

MicroVAX 3100 Model 90 Troubleshooting and Diagnostic Information,
EK-A0518-TM

•

VMS Factory Installed Software User Guide, EK-A0377-UG

Conventions
The following conventions are used in this manual:

xii

Convention

Description

Ctrl/x

Ctrl/x indicates that you hold down the Ctrl key while you press
another key or mouse button (indicated here by x).

A lowercase italic x indicates the generic use of a letter. For
example, xxx indicates any combination of three alphabetic
characters.

italic type

Italic type emphasizes important information, indicates variables,
and indicates the complete titles of manuals.

boldface type

Boldface type in examples indicates user input. Boldface type in text
indicates the first instance of terms defined either in the text, in the
glossary, or both.

nn nnn.nnn nn

A space character separates groups of 3 digits in numerals with 5 or
more digits. For example, 10 000 equals ten thousand.

n.nn

A period in numerals signals the decimal point indicator. For
example, 1.75 equals one and three-fourths.

Note

A note contains information of special importance to the reader.

Caution

A caution contains information to prevent damage to the equipment.

1
Enclosure Description
This chapter describes the BA42-B enclosure. It gives information on the
following:
•

Mass storage device areas

•

Controls, indicators, ports, and connectors

•

Power and signal distribution

•

Air circulation

•

Configuration guidelines

The BA42-B enclosure houses the system unit of the MicroVAX 3100 Model
40, Model 80, and Model 90 systems. It is a desktop style enclosure (see
Figure 1–1).

Enclosure Description 1–1

Enclosure Description

Figure 1–1 BA42-B Enclosure

RE_EN06213A_91

1–2 Enclosure Description

Enclosure Description

1.1 Mass Storage Device Areas
The BA42-B enclosure can contain 3.5 inch (13.5 cm) and 5.25 inch (20.25 cm)
half-height mass storage devices. These mass storage devices are mounted on
two drive-mounting shelves. The upper drive-mounting shelf can contain one,
two, or three disk drives. The lower drive-mounting shelf can contain one or
two devices, that is, disk drives or removable media devices. See Section 1.5.3
for information about mass storage device combinations and orientation.

1.2 Controls, Indicators, Ports, and Connectors
The power OK indicator (POK) is on the front of the BA42-B enclosure.
Figure 1–2 shows the controls, indicators, ports, and connectors on the BA42-B
enclosure. Table 1–1 describes the functions of the controls, indicators, ports,
and connectors.

Enclosure Description 1–3

Enclosure Description

Figure 1–2 Controls, Indicators, Ports, and Connectors

On/Off Switch
ac Power Socket

SCSI Port
Synchronous
Communications
Ports (0,1)
Asynchronous
Communications
Ports (A,B)

B
1

A
0

MMJ Ports (0,1,3)
Asynchronous Modem
Control Port (2)
Halt Push Button
Break/Enable Switch
Break/Enable LED
LED Display
Standard Ethernet Port
Ethernet Switch
ThinWire Ethernet Port

Power OK Indicator (POK)

RE_EN06214A_91

1–4 Enclosure Description

Enclosure Description

Table 1–1 Functions of the Controls, Indicators, Ports, and Connectors
Component

Description

On/Off switch

Applies and stops the power to the system unit as follows:

System ac power socket
1

•

On ( | ) —Applies the ac power to the system unit

•

Off (O) —Stops the ac power to the system unit

A socket for the ac power input.

SCSI port

A port that allows you to connect external SCSI devices.

Synchronous communications ports (0,1)2

Two ports that allow you to connect devices that have
synchronous communications support.

Asynchronous communications ports (A,B)2

One or two ports that provide one of the following
asynchronous communications expansion options:
•

Eight DEC423 compatible asynchronous ports

•

Sixteen DEC423 compatible asynchronous ports

•

Eight EIA-232 compatible modem ports

MMJ3 port 0

DEC423 compatible asynchronous port. On models 40 and
80, this port is the primary console port. On model 90, this
is the standard terminal port.

MMJ port 1

DEC423 compatible asynchronous port.

MMJ port 3

DEC423 compatible asynchronous port. For models 48 and
80, this port functions as an alternate console port when the
break/enable switch is set in the up position when you turn
on the system unit. For model 90, this port is the primary
console port.

Asynchronous modem
control port (2)

EIA-232 compatible asynchronous port with modem control.

Halt push button

A momentary-contact push button that puts the system in
console mode.

1 Small computer system interface (SCSI).
2 Optional ports that depend on the system configuration.
3 Modified modular jack (MMJ).

(continued on next page)

Enclosure Description 1–5

Enclosure Description

Table 1–1 (Cont.) Functions of the Controls, Indicators, Ports, and Connectors
Component

Description
4

Break/enable switch

Break/enable LED

A two-position switch that determines the function of MMJ
port 3 as follows:
•

Up position—On models 40 and 80, MMJ port 3
functions as a console port. On model 90, this enables
the Break key. In this state, you can press the Break
key on the keyboard of a terminal connected to MMJ
port 3 to put the system in console mode.

•

Down position—On models 40 and 80, MMJ port 3
functions as a normal communications port and MMJ
port 0 functions as a console port. On model 90, this
disables the Break key.

A LED5 indicates the position of the Break Enable switch as
follows:
•

On—On models 40 and 80, MMJ port 3 functions as
a console port. On model 90, this enables the Break
key. In this state, you can press the Break key on the
keyboard of a terminal connected to MMJ port 3 to put
the system in console mode.

•

Off—On models 40 and 80, MMJ port 3 functions as a
normal communications port and MMJ port 0 functions
as a console port. On model 90, this disables the Break
key.

LED display

A set of eight LEDs that provides power-up and selftest diagnostic code information. This is useful for fault
diagnosis when the console terminal is not functioning.
LEDs five and six on not used for the model 90.

Standard Ethernet port

A port that allows you to connect the system to a standard
Ethernet network.

Ethernet switch

A two-position switch that determines the type of Ethernet
that the system uses as follows:
•

Left position—selects the standard Ethernet type

•

Right position—selects the ThinWire™ Ethernet type

4 The system recognizes the position of this switch only when you turn on the power.
5 Light emitting diode (LED).

(continued on next page)

1–6 Enclosure Description

Enclosure Description

Table 1–1 (Cont.) Functions of the Controls, Indicators, Ports, and Connectors
Component

Description

ThinWire Ethernet port

A port that allows you to connect the system to a ThinWire
Ethernet network.

1.3 Power and Signal Distribution
The power supply unit (30-35042-01) provides power to all the units in the
enclosure. It accepts alternating current (ac) input voltage in the ranges 110 V
ac to 120 V ac (88 V rms1 to 132 V rms) and 220 V ac to 240 V ac (176 V rms
to 264 V rms).
The regulators in the power supply unit maintain the correct direct current
(dc) output voltages, which are independent of the fluctuations in the ac
input power. The power supply unit can provide a continuous power output
of 166 watts (W). The power supply unit has two internal, variable speed,
automatically adjusting fans that cool the unit while it operates. Table 1–2
gives the current specifications of the dc circuits.
Table 1–2 Power Supply Unit dc Outputs
Voltage (dc)

Output Current Range in Amperes (dc)
Minimum

Maximum

(A1 )

(A)

+5.1

3.8

15.0

+12.1

0.18

7.1

-12.0

0.3

1.0

-9.0

0.0

0.2

+3.3

0.0

3.5

1 Amperes (A).

The power supply unit (30-35042-01) has the following output connectors:
•

A flying lead connector that provides the dc power to the central processing
unit (CPU) module

•

One connector on the side of the power supply unit that provides the dc
power to the devices on the upper drive-mounting shelf

Root mean square.

Enclosure Description 1–7

Enclosure Description

•

One connector on the side of the power supply unit that provides the dc
power to the devices on the lower drive-mounting shelf

•

One connector that provides a 3.3 V dc output (Model 80 systems only).

Figure 1–3 shows the distribution of power in the BA42-B enclosure.
Figure 1–3 Power Distribution

CPU Module
3.3 V dc
Harness Cable
(17-03136-01)
(Model 80 Only)
Lower Shelf
dc Harness
Cable
(17-03018-01)

Power
Supply

TZ30 Only
TLZ06 or
TZK10 or
RRD42 or
RX26 or
RZ2*

TLZ06 or
TZ30 or
TZK10 or
RRD42 or
RX26 or
RZ2*

Additional
Connector
for RX26
Lower Drive
Mounting Shelf
Upper Shelf
dc Harness
Cable
(17-02219-01)
Not Used

RZ2*

Upper Drive
Mounting Shelf
Note: RZ2* denotes RZ23L, RZ24, RZ24L, RZ25, or RZ26 disk drives.
RE_EN06215M_91

1–8 Enclosure Description

Enclosure Description

Appendix A provides information on the pin specifications for the connectors.
The CPU module is the main source for signal distribution in a BA42-B
enclosure system. The SCSI cable is connected to the CPU module. Each
of the other connectors on the SCSI cable has a pull-tab. Use the pull-tab
to disconnect the cable from a SCSI device. Each pull-tab has a number
that identifies the drive to which the SCSI cable connector is connected (see
Figure 1–4).
Figure 1–4 Signal Distribution
CPU Module
Internal SCSI

External
Synchronous Asynchronous
SCSI
Input/Output
Input/Output
(17-02944-01) (17-02942-01) (17-02942-01)

SCSI Cable
(17-02943-01)

Power
Supply

TLZ06 or
TZK10 or
RRD42 or
RX26 or
RZ2*

TLZ06 or
TZ30 or
TZK10 or
RRD42 or
RX26 or
RZ2*

Lower Drive
Mounting Shelf

2
3

1
RZ2*

RZ2*

Upper Drive
Mounting Shelf
Note: RZ2* denotes RZ23L, RZ24, RZ24L, RZ25, or RZ26 disk drives.
RE_EN06216M_91

Enclosure Description 1–9

Enclosure Description

1.4 Air Circulation
The power supply unit (30-35042-01) contains two fans. These fans provide the
air circulation for the enclosure. The fans adjust their speed automatically as
the temperature of the system unit changes. The air intake is on the right side
of the BA42-B enclosure (when viewed from the front), and the air exhaust is
on the left side. A typical value of airflow is 0.0104 cubic meters per second
(m³/sec) (22 cubic feet per minute [ft³/min]).

1.5 Configuration Guidelines
The combination of memory, communications options, and internal mass
storage devices determines the configuration of a system. See the KA45 CPU
System Maintenance manual, the KA47 CPU System Maintenance manual,
or the KA50 CPU System Maintenance manual for a list of the external mass
storage devices that a MicroVAX 3100 platform system supports.

1.5.1 Memory
The MicroVAX 3100 Model 40, Model 80, and Model 90 systems have different
memory configurations.
1.5.1.1 Model 40 Memory Configurations
In the Model 40, the basic system memory is 8M bytes. This memory is
permanently fixed to the CPU module. You can expand the memory in the
system in 8M-byte increments by adding MS44-BA or MS44L-BA memory
options. Each MS44-BA memory option consists of two MS44-AA (4M-byte)
memory modules. Each MS44L-BA memory option consists of two MS44L-AA
(4M-byte) memory modules. Table 1–3 lists the memory configurations for a
Model 40 system. Figure 1–5 shows the location of the memory expansion
connectors on the KA45 CPU module.

1–10 Enclosure Description

Enclosure Description

Table 1–3 Memory Configurations for the Model 40 System
Total

Onboard

Memory Memory

Increment 2

Increment 1
1H1

Increment 3

MS44-AA

(bytes)

16M

MS44-AA2

MS44-AA

24M

MS44-AA

32M

MS44-AA

1 1H, 1L, 2H, 2L, 3H, 3L are connector identifiers (see Figure 1–5).
2 The MS44-AA memory module is a 4M-byte memory module. Each MS44L-BA memory option
consists of two MS44L-AA memory modules. You can use MS44L-AA memory modules in place of
MS44-AA memory modules.

Enclosure Description 1–11

Enclosure Description

Figure 1–5 Memory Expansion Connectors on the KA45 CPU Module
3L
2L
1L

3H
2H
1H

RE_EN06217A_91

1.5.1.2 Model 80 Memory Configurations
In the Model 80, the basic system memory is 8M bytes. This memory is
contained on two MS44-AA or MS44L-AA modules installed on the KA47
CPU module. You can expand the system memory in 8M-byte or 32M-byte
increments by adding MS44-BA, MS44L-BA or MS44-DA memory options. An
MS44-BA memory option consists of two MS44-AA (4M-byte) memory modules.
An MS44L-BA memory option consists of two MS44L-AA (4M-byte) memory
modules. An MS44-DA memory option consists of two MS44-CA (16M-byte)
memory modules. Table 1–5 lists the memory configurations for Model 80
systems. Figure 1–6 shows the locations of the memory expansion connectors
on the KA47 CPU module.

1–12 Enclosure Description

Enclosure Description

Table 1–5 Memory Configurations for the Model 80 System
Total

Increment 11

Increment 2

1H2

MS44-AA3

MS44-AA

16M

MS44-AA

24M

MS44-AA

Memory

Increment 3

MS44-AA

MS44-AA
MS44-CA

MS44-AA

(bytes)

40M

MS44-AA

MS44-CA4

48M

MS44-AA

MS44-CA

72M

MS44-AA

MS44-CA

1 Basic system memory.
2 1H, 1L, 2H, 2L, 3H, 3L are connector identifiers (see Figure 1–6).
3 The MS44-AA memory module is a 4M-byte memory module.

The MS44-BA memory option
consists of two MS44-AA memory modules. You can use MS44L-AA memory modules in place of
MS44-AA memory modules.
4 The MS44-CA memory module is a 16M-byte memory module. The MS44-DA memory option
consists of two MS44-CA memory modules.

Enclosure Description 1–13

Enclosure Description

Figure 1–6 Memory Expansion Connectors on the KA47 CPU Module

3L
2L
1L

3H
2H
1H

RE_EN06218A_91

1.5.1.3 Model 90 Memory Configurations
In the Model 90, the basic system memory is 16M bytes. This memory is
contained on four MS44L-AA modules installed on the KA50 CPU module. You
can expand the system memory in 16M-byte or 64M-byte increments by adding
MS44L-BC or MS44-DC memory options. An MS44L-BC memory option
consists of MS44L-AA (4M-byte) memory modules. An MS44-DC memory
option consists of four MS44-CA (16M-byte) memory modules. Table 1–5
lists the memory configurations for Model 90 systems. Figure 1–6 shows the
locations of the memory expansion connectors on the KA50 CPU module.

1–14 Enclosure Description

Enclosure Description

Table 1–5 Memory Configurations for the Model 90 System
Total
Memory

Increment 11

Increment 2

(0A + 0B + 0C + 0D)2

(1E + 1F + 1G + 1H)2

(bytes)
16M

MS44L-BC

32M

MS44L-BC

64M

MS44-DC

80M

MS44-DC

MS44L-BC

128M

MS44-DC

MS44L-BC

1 Basic system memory.
2 0A, 0B, 0C, 0D, 1E, 1F, 1G, and 1H are connector identifiers (see Figure 1–6).

Enclosure Description 1–15

Enclosure Description

Figure 1–7 Memory Expansion Connectors on the KA50 CPU Module

1G
0C
1E
0A

1H
0D
1F
0B
GA_EN00093A_92A

1.5.2 Communications Options
Table 1–6 lists the communications options that a BA42-B enclosure can
contain.

1–16 Enclosure Description

Enclosure Description

Table 1–6 BA42-B Communications Options
Option Name

Description

Asynchronous Options
DHW42-AA

Provides eight DEC423 asynchronous lines

DHW42-BA

Provides 16 DEC423 asynchronous lines

DHW42-CA

Provides eight EIA-232 asynchronous modem lines

DHW42-UP

Eight to 16 DEC423 asynchronous line upgrade

Synchronous Options
DSW42-AA1

Provides two EIA-232/V.24 synchronous lines

1 This option is supplied with two external cables that support the EIA-232/V.24 interface.

The DSW42-AA option also supports the communications interfaces listed in
Table 1–7, but you must order the external cable separately.
Table 1–7 DSW42-AA Communications Interface Support
Communications Interface

External Cable

EIA-423/V.10

BC19E-02

EIA-422/V.11

BC19B-02

Each communications option contains three field replaceable units (FRUs) that
are installed in the enclosure as follows:
•

A logic board
The logic board connects directly to the CPU module.

•

An input/output cable
The input/output cable connects the CPU module to the input/output
module.

•

An input/output module
The input/output module is a snap-fit assembly that is attached to the
inside of the back panel of the BA42-B enclosure.

Enclosure Description 1–17

Enclosure Description

The communications options logic boards have different locations in the
BA42-B enclosure, depending on the model number of the system, as follows:
•

In Model 40 and Model 80 systems, the DHW42 logic board is located
to the right of the CPU Module, with the DSW42 logic board logic board
located to its left (see Figure 1–8).

•

In Model 90 systems, the DHW42 logic board is located to the left of the
CPU Module, with the DSW42 logic board logic board located to its right
(see Figure 1–9).

Figure 1–8 Communications Options in Model 40 and Model 80 Systems
DSW42 Input/Output Module
DSW42 Input/Output Cable
DSW42 Logic Board

DHW42 Input/Output Module
DHW42 Input/Output Cable
DHW42 Logic Board
RE_EN06219A_91

1–18 Enclosure Description

Enclosure Description

Figure 1–9 Communications Options in Model 90 Systems
DSW42 Input/Output Module
DSW42 Input/Output Cable
DSW42 Logic Board

DHW42 Logic Board
DHW42 Input/Output Module
DHW42 Input/Output Cable

GA_EN00094A_92A

Enclosure Description 1–19

Enclosure Description

1.5.3 Mass Storage Devices
Table 1–8 lists the mass storage devices that the BA42-B enclosure can
contain.
Table 1–8 BA42-B Mass Storage Devices
Option Name

Description

Size1

Capacity

(in)
RZ23L

Disk drive

3.5

120M bytes

RZ24

Disk drive

3.5

209M bytes

RZ24L

Disk drive

3.5

245M bytes

RZ25

Disk drive

3.5

400M bytes

RZ26

Disk drive

3.5

1.05 Gigabytes (G
bytes)

RZ35

Disk drive

3.5

852M bytes

TZ302

Tape drive

5.25

95M byte cartridge

TZK102

Tape drive

5.25

Range of cartridges3

TLZ062

Tape drive

5.25

Range of cassettes4

RX262

Diskette drive

3.5

Range of diskettes5

5.25

600M byte CD-ROM

RRD42

CD-ROM drive

1 Size of half-height device.
2 Removable media device.

3 Supports 320M byte and 525M byte cartridges.

4 Supports 60 metre (m) and 90 m cassettes
5 Supports 1.4M byte and 2.8M byte diskettes.

The BA42-B enclosure has two drive-mounting shelves for mass storage devices
as follows:
•

Upper drive-mounting shelf
The upper drive-mounting shelf can contain one, two, or three disk drives.

•

Lower drive-mounting shelf
The lower drive-mounting shelf can contain one or two devices. These
devices are either disk drives or removable media devices.

1–20 Enclosure Description

Enclosure Description

Figure 1–10 shows the combinations of mass storage devices in a BA42-B
enclosure.

Enclosure Description 1–21

Enclosure Description

Figure 1–10 Mass Storage Device Combinations in the BA42-B Enclosure
Upper Drive-Mounting Shelf

RZ*

Upper Drive-Mounting Shelf

RZ*

RRD42 or TZK10 or
TLZ06 or RX26

RRD42 or TZK10 or
TLZ06 or TZ30 or RX26

Left-hand compartment

Right-hand compartment

Note: RZ* denotes RZ23L, RZ24, RZ24L, RZ25 or RZ26 disk drives.
GA_EN00187D_92A

1–22 Enclosure Description

2
Installation
This chapter describes how to install a BA42-B system. It gives information on
the following:
•

Preparing the site

•

Unpacking the system

•

Installing a BA42-B system

2.1 Preparing the Site
Before you unpack the BA42-B system, verify the physical, environmental, and
electrical requirements described in this section.

2.1.1 Dimensions
Figure 2–1 shows the dimensions of the BA42-B enclosure.
Caution
The container and enclosure together typically weigh 20.50 kilograms
(kg) (45 pounds [lb]). Two people are required to handle the container.

Installation 2–1

Installation

Figure 2–1 BA42-B Dimensions

14.99 cm
(5.90 in)

40.00 cm
(15.75 in)
46.83 cm
(18.26 in)

RE_EN06221A_91

The dimensions of the container are as follows:
•

Height = 35.3 cm (14.0 inches)

•

Width = 61.1 cm (24.0 inches)

•

Depth = 51.0 cm (20.0 inches)

2.1.2 Additional Equipment
When you are installing additional equipment, follow these guidelines:
•

Make sure that there is sufficient space for the terminals and other
peripheral equipment.

•

Make sure that you keep the mass storage devices in an area that has the
same temperature and humidity as the computer area (see Table 2–1).

•

When you plan the cable routing for multiple-terminal systems, consider
factors such as safety, convenience, future expansion, and cost. Label and
install the cables before you install the system.

2–2 Installation

Installation

2.1.3 Operating Environment
Computer systems in office areas are subject to electrostatic discharge (ESD),
temperature changes, and humidity. To install the system in the correct
environment, follow these guidelines:
•

Install the system in a well-ventilated area where the temperature and
humidity ranges listed in Table 2–1 are maintained during the year.

•

Do not place a system near heating or cooling devices, large windows, or
doors that open to the outside. Rapid changes of temperature can affect
the performance of the system.

•

Place the system in an area where the air contains a minimum of dust and
other abrasive contaminants.

2.1.4 Electrostatic Discharge
ESD can cause system failures and loss of data. To minimize the build up of
static electricity, follow these guidelines:
•

Maintain a relative humidity level of at least 40%.

•

Place the system away from busy corridors.

•

Carpet in the computer area is not recommended. However, if you want to
use carpet, antistatic carpet is recommended. When carpet is already in
use, put an antistatic mat under the system.

2.1.5 Heat Dissipation
The heat dissipated by a BA42-B enclosure system depends on the model
number of the system, but is typically 410 British thermal units/hour (Btu/h).

2.1.6 Temperature, Humidity, and Altitude Ranges
Table 2–1 gives the operating, nonoperating, and storage ranges for the
temperature, humidity, and altitude for BA42-B enclosure systems.

Installation 2–3

Installation

Table 2–1 Temperature, Humidity, and Altitude Ranges
Parameter

Operating Range1

Nonoperating Range

Storage Range

Temperature

10°C to 40°C

-40°C to 66°C

5°C to 50°C

(50°F to 104°F)

(-40°F to 151°F)

(41°F to 122°F)

Relative
humidity2

10% to 90%

10% to 95%

Altitude

2400 m maximum

4900 m maximum

(8000 ft maximum)

(16 000 ft maximum)

Rate of change
of temperature

10% to 95%

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

1 For operation above sea level, decrease the operating temperature by 1.8°C per 1000 m (or 1°F
per 1000 ft).
2 At a temperature of 66°C.

2–4 Installation

Installation

2.1.7 Electrical Requirements
The power source to which the system connects must be capable of providing
power to the system unit and any other additional equipment, such as local
terminals and expansion boxes. Digital™ recommends that each system
operates in a dedicated power circuit. Additional power equipment may
be required to avoid power interruptions. Table 2–2 lists the electrical
requirements of systems in BA42-B enclosures. The power supply unit in
the system is autosensing. You do not have to select the input voltage.
Table 2–2 BA42-B Electrical Requirements
Parameter

Values

Nominal voltages

110 V ac or 220 V ac

Voltage ranges

100 V ac to 120 V ac (88 V rms1 to 132 V rms) and
220 V ac to 240 V ac (176 V rms to 264 V rms)

Power source phase

Single

Nominal frequencies

50 Hz2 or 60 Hz

Frequency range

47 Hz to 63 Hz

Maximum running current

1.2 A for 110 V ac systems and 0.6 A for 220 V ac
systems

Steady state current

1.0 A for 110 V ac systems and 0.5 A for 220 V ac
systems

Maximum inrush current

32 A

Maximum power consumption

120 W

1 Root mean square (rms).
2 Hertz (Hz).

2.2 Unpacking the System
Open the container. Remove the box and the accessory tray. The box contains
the system unit. The accessory tray contains the following:
•

Customer Hardware Information Kit

•

VMS Factory Installed Software User Guide

•

Software licenses

•

Power cord

•

Other accessories

Installation 2–5

Installation

Expansion boxes are supplied in separate containers.
Figure 2–2 System Unit and Accessory Tray Contents

DEC423 Terminal Cable

System Unit

ThinWire T-Connector
and Two Terminators

Power Cord

Standard Ethernet
Loopback Connector

RS232 to
DEC423 Adapter

Documentation and
Software Licences
RE_EN06222A_91

Depending on the system configuration, the contents of the container may
differ from the items shown in Figure 2–2. When unpacking the system, do the
following:
1. Check the contents of the container against the packing slip.
2. Store the unused parts for future use. Depending on how you set up the
system, you may not use all the components supplied with the system.
Always repack the system unit in its original packing material when moving or
relocating the system. This precaution protects the system from damage.

2–6 Installation

Installation

2.3 Installing the BA42-B System
Install the BA42-B enclosure according to the instructions in the following
subsections.

2.3.1 Placing the BA42-B Enclosure
After you unpack the system, move the BA42-B enclosure to the location from
which it will operate. Place the enclosure so that it satisfies the following space
requirements:
•

Allow 5 cm (2 inches approximately) of clearance on each side of the
enclosure for ventilation.

•

Allow 10 cm (4 inches approximately) of clearance on the back of the
enclosure for the connection of cables.

•

Allow 20 cm (8 inches approximately) of clearance on the front of the
enclosure so that you can reach the removable media devices, depending on
the system configuration.

2.3.2 Identifying the Ports and Connectors on the System Unit
Figure 1–2 shows the ports and connectors in a BA42-B enclosure system.
Section 1.2 describes the functions of the controls, indicators, ports, and
connectors in a BA42-B enclosure system.

2.3.3 Connecting the Console Terminal
To connect a console terminal to a BA42-B enclosure, follow these steps:
1. Make sure that the on/off switch on the terminal is in the off position.
2. Set the communication parameters of the terminal (see Table 2–3).
Table 2–3 Terminal Settings
Feature

Setting

Terminal mode

VTnnn-7bit

Transmit speed

9600 baud

Receive speed

receive = transmit

Character format

8 bits, no parity

Stop bits

Comm1 port

DEC-423 (data-leads-only)

Installation 2–7

Installation

See the terminal documentation if you want more information on setting
up the terminal.
Note
If you connect the terminal cable to one of the MMJ ports on the back
of a VT3xx terminal, you must set the port so that it can operate as a
DEC423 port. See the terminal documentation for more information.

3. Connect the terminal cable supplied with the system (see Figure 2–2) to
MMJ port 3 on the back of the system unit (see Figure 2–3). Connect the
other end of the console cable to a DEC423 port on the terminal. You may
remove the label covering MMJ ports 0 and 1.
4. If the terminal has EIA-232 ports only, connect the EIA-232 to DEC423
adapter to the EIA-232 port on the terminal. Then connect the terminal
cable to the EIA-232 to DEC423 adapter.
Note
Some terminal cables have an earth drain wire. You must connect this
earth drain wire to the grounding pillar above MMJ port 1, using the
screw provided with the cable.

2–8 Installation

Installation

Figure 2–3 Connecting the Console Terminal

GA_EN00146A_92A

Installation 2–9

Installation

2.3.4 Connecting the ThinWire Terminator or Loopback Connector
You can connect BA42-B systems to either a ThinWire Ethernet network or to
a standard Ethernet network. To test the Ethernet circuitry in the system unit
before you connect to a network, install either the ThinWire terminator or the
standard Ethernet loopback connector.
The ThinWire terminator and the standard Ethernet loopback connector are
supplied with BA42-B systems (see Figure 2–2). The ThinWire terminator
consists of a T-connector and two terminators. The standard Ethernet loopback
connector is a single unit.
You choose the network type using the Ethernet switch on the back of the
system unit (see Figure 1–2). The switch settings for the network types are as
follows:
•

Left position—standard Ethernet

•

Right position—ThinWire Ethernet

When you want to use a ThinWire Ethernet network, follow these steps:
1. Set the Ethernet switch to the right position.
2. To form a ThinWire terminator, connect the two terminators (see
Figure 2–4) to the T-connector.
3. Connect the ThinWire terminator to the ThinWire Ethernet port on the
back of the system unit turning the barrel connector clockwise until it locks
(see Figure 2–4).

2–10 Installation

Installation

Figure 2–4 Connecting the ThinWire Terminator to the System Unit

Terminators

T-Connector

GA_EN00147A_92A

Installation 2–11

Installation

If you want to use a standard Ethernet network, follow these steps:
1. Set the Ethernet switch to the left position.
2. Connect the standard Ethernet loopback connector to the standard
Ethernet port on the back of the system unit (see Figure 2–5).
Figure 2–5 Connecting the Standard Ethernet Loopback Connector to the
System Unit

Standard Ethernet Loopback Connector

GA_EN00148A_92A

2–12 Installation

Installation

2.3.5 Connecting the System Unit Power Cord
A BA42-B enclosure system accepts 100 V ac to 120 V ac at 50 Hz or 60 Hz, or
220 V ac to 240 V ac at 50 Hz or 60 Hz. The power supply unit is self-sensing.
You do not have to select the input voltage. To connect the system unit power
cord, follow these steps:
1. Set the on/off switch on the back of the system unit to the off (O) position.
2. Connect the power cord, supplied with the system (see Figure 2–2), to the
ac power socket on the back of the system unit (see Figure 2–6).
3. Connect the other end of the power cord to a grounded power outlet.

Installation 2–13

Installation

Figure 2–6 Connecting the Power Cord

Power Cord

B
1

A
0

GA_EN00149A_92A

2.3.6 Turning On the System
To turn on the system, follow these steps:
1. Set the on/off switch on the terminal to the on position.
2. Set the on/off switch on the system unit to the on ( | ) position (see
Figure 2–7).

2–14 Installation

Installation

Figure 2–7 Turning On the System Unit
On/Off Switch

GA_EN00150A_92A

See the KA45 CPU System Maintenance manual, the KA47 CPU System
Maintenance manual, or the KA47 CPU System Maintenance manual for
information about the self-tests that run when you turn on the system.

Installation 2–15

3
Removing and Replacing FRUs
This chapter describes how to remove and replace the FRUs in the BA42-B
enclosure. It gives information on the following:
•

Removing the enclosure cover

•

Removing an MS44 or MS44L memory module

•

Removing an RZ-series disk drive from the upper drive-mounting shelf

•

Removing the upper drive-mounting shelf

•

Removing an RZ-series disk drive from the lower drive-mounting shelf

•

Removing an RX26 diskette drive assembly

•

Removing a TZ30 tape drive

•

Removing a TZK10 tape drive

•

Removing a TLZ06 tape drive

•

Removing an RRD42 CD-ROM drive

•

Removing the upper and lower drive-mounting shelf combination

•

Removing the SCSI cable

•

Removing a DSW42 synchronous communications option

•

Removing a DHW42 asynchronous communications option

•

Removing the CPU module

•

Replacing the CPU module

•

Removing the power supply unit
Note
Unless otherwise specified, you can replace an FRU by reversing the
steps described in the removal procedure.

Removing and Replacing FRUs 3–1

Removing and Replacing FRUs

Table 3–1 lists the major FRUs in the BA42-B enclosure. It also gives the
order numbers for the FRUs and a reference to a section in this chapter that
gives information on how to replace the FRU. See the Options manual for more
information about options. Appendix B gives a complete list of the spare parts
for the BA42-B enclosure. Figure 3–1 shows the locations of the major FRUs
in the BA42-B enclosure.
Caution
•

Disconnect the power supply before removing or installing FRUs.

•

Only qualified personnel should remove or install the FRUs.

•

Static electricity can damage integrated circuits. Wear a wrist
strap and place an antistatic mat under the system unit when
working with the internal parts of the system unit.

You must have the following tools to replace the FRUs in a MicroVAX 3100
platform system:
•

A number 1, Philips screwdriver

•

A flat screwdriver

3–2 Removing and Replacing FRUs

Removing and Replacing FRUs

Table 3–1 Major FRUs in the BA42-B Enclosure
FRU

Order Numbers

Section

Memory module

MS44-AA, MS44L-AA,
MS44-CA

3.2

Disk drive

RZ23L-E

3.3, 3.5

Disk drive

RZ24-E

3.3, 3.5

Disk drive

RZ24L-E

3.3, 3.5

Disk drive

RZ25-E

3.3, 3.5

Disk drive

RZ26-E

3.3, 3.5

Disk drive

RZ35-E

3.3, 3.5

Diskette drive

RX26-AA

3.6

Tape drive

TZ30-AX

3.7

Tape drive

TZK10-AA

3.8

Tape drive

TLZ06-AA

3.9

CD-ROM drive

RRD42-AA

3.10

Synchronous communications option

DSW42-AA

3.13

Asynchronous communications option

DHW42-AA, -BA, -CA

3.14

KA45 CPU module

54-20654-01

3.15

KA47 CPU module

54-20652-01

3.15

KA50 CPU module

Power supply unit

54-21797-01

3.15

30-35042-01

3.17

1 Model 40 CPU module only
2 Model 80 CPU module only
3 Model 90 CPU module only

Removing and Replacing FRUs 3–3

Removing and Replacing FRUs

Figure 3–1 Major FRUs in the BA42-B Enclosure

RZ* Disk Drives
Upper Drive
Mounting Shelf

RZ* Disk Drive
(Optionally,
TLZ06 Tape Drive, or
TZK10 Tape Drive, or
RX26 Diskette Drive, or
RRD42 CDROM Drive)

DSW42 Input/Output Module
DSW42 Input/Output Cable
DSW42 Logic Board
Power Supply Unit

DHW42 Logic Board
DHW42 Input/Output Module
DHW42 Input/Output Cable
CPU Module
Note: RZ* denotes RZ23L, RZ24, RZ24L, RZ25, or RZ26 disk drives.

3–4 Removing and Replacing FRUs

Lower Drive
Mounting Shelf

TZK10 Tape Drive
(Optionally,
TLZ06 Tape Drive, or
TZ30 Tape Drive, or
RZ* Disk Drive, or
RX26 Diskette Drive, or
RRD42 CDROM Drive)

MS44 Memory
Module

GA_EN00095A_92A

Removing and Replacing FRUs

3.1 Removing the Enclosure Cover
To remove the enclosure cover, follow these steps:
1. Set the on/off switch on the system unit to the off (O) position.
2. Disconnect the cables, loopback connectors, and terminators that are
connected to the system unit.
3. Loosen the two captive screws (12-30338-05) on the back of the system unit
(see Figure 3–2).
4. Slide the cover forward and lift it up from the system unit.
Figure 3–2 Removing the Enclosure Cover

Enclosure Cover

B
1

A
0

Captive Screws (2)
RE_EN06230A_91

Removing and Replacing FRUs 3–5

Removing and Replacing FRUs

3.2 Removing an MS44 or MS44L Memory Module
To remove a memory module, follow these steps:
1. Remove the enclosure cover (see Section 3.1).
Caution
Static electricity can damage integrated circuits. Wear a wrist strap
and place an antistatic mat under the system unit when working with
the internal parts of the system unit.

2. Locate the faulty memory module. Figure 3–3 shows the location of the
memory module connectors on the KA45 or KA47 CPU module. Figure 3–4
shows the location of the memory module connectors on the KA50 CPU
module.
Note
•

Note the position of the faulty memory module on the CPU
module. You must install a replacement in this position.

•

You may have to remove one or two memory modules to reach
the faulty memory module. Note carefully the position of each
memory module you remove.

3–6 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–3 Memory Module Connectors on the KA45 or KA47 CPU Module

MS44 Memory Modules (2)

3H
RE_EN06245A_91

Removing and Replacing FRUs 3–7

Removing and Replacing FRUs

Figure 3–4 Memory Module Connectors on the KA50 CPU Module

MS44 or MS44L Memory Modules (4)

0A 1E 0C

0B 1F 0D

1H
GA_EN00096A_92A

3. Push the metal board clips on the memory module connector away from the
center. Tilt the memory module towards the back of the enclosure, and lift
the memory module out of its connector (see Figure 3–5).
Caution
When installing a memory module, note that the connectors on the
CPU module are keyed so that you cannot install the memory module
with an incorrect orientation. Do not try to force a module into a
connector with an incorrect orientation.

3–8 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–5 Removing a Memory Module

Metal Board Clip

MS44 Memory Modules

RE_EN06246A_91

Removing and Replacing FRUs 3–9

Removing and Replacing FRUs

3.3 Removing an RZ-Series Disk Drive from the Upper
Drive-Mounting Shelf
Depending on the system configuration, the upper drive-mounting shelf can
contain one, two, or three disk drives. The disk drives can be any combination
of the RZ-series disk drives. The RZ-series disk drives include the following
devices:
•

RZ23L disk drive

•

RZ24 disk drive

•

RZ24L disk drive

•

RZ25 disk drive

•

RZ26 disk drive

•

RZ35 disk drive

You can remove a disk drive from the enclosure without removing the upper
drive-mounting shelf from the enclosure. To remove an RZ-series disk drive
from the upper drive-mounting shelf, follow these steps:
1. Remove the enclosure cover (see Section 3.1).
Note
•

You can disconnect the cables from a disk drive more easily
after you remove the disk drive from the drive-mounting shelf.

•

When disconnecting cables, you must note which cables connect
to which drives. On the SCSI cable, note the number on the
connector pull-tab.

2. Press and hold the spring clip that locks the disk drive in position.
3. Push the disk drive towards the spring clip until the rubber grommets
under the disk drive are released from the cutouts in the drive-mounting
shelf (see Figure 3–6). Lift the disk drive up from the drive-mounting shelf
and release the spring clip.

3–10 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–6 Removing RZ-Series Disk Drives from the Upper Drive-Mounting
Shelf

RZ24 Disk Drive
Spring Clip

RE_EN06231A_91

4. Disconnect the SCSI cable from the back of the disk drive by pulling the
pull-tab. Figure 1–4 shows the signal cables in the BA42-B enclosure.
5. Disconnect the power cable from the back of the disk drive. Figure 1–3
shows the power cables in the BA42-B enclosure.

3.3.1 Separating the Support Plate from an RZ23L, RZ24, or RZ24L
Disk Drive
When you are replacing an RZ23L, RZ24, or RZ24L disk drive, you must
remove the support plate (74-41364-01) and the rubber grommets (12-3173401) that are attached to the faulty disk drive (RZ23L-E, RZ24-E, or RZ24L-E)
and install these items on the replacement drive. The following procedure
describes how to remove the support plate and rubber grommets from an
RZ23L disk drive. The procedure for removing the support plate and rubber
grommets from an RZ24 or RZ24L disk drive is the same. To remove the

Removing and Replacing FRUs 3–11

Removing and Replacing FRUs

support plate and rubber grommets from an RZ23L disk drive, follow these
steps:
1. Position the disk drive so that the bottom of the disk drive faces up.
2. Remove the four screws and attached grommets (see Figure 3–7). These
screws secure the support plate to the disk drive.
Figure 3–7 Separating the Support Plate from the Disk Drive

Grommets (4)

Support Plate

RZ23L Disk Drive

RE_EN06451A_91

3. Remove the support plate from the disk drive.
4. Keep the four screws with the attached grommets and the support plate in
a safe place. You must install them on the replacement disk drive.

3–12 Removing and Replacing FRUs

Removing and Replacing FRUs

3.3.2 Separating the Mounting Bracket from an RZ25, RZ26, or RZ35
Disk Drive
When you are replacing an RZ25, RZ26, or RZ35 disk drive, you must remove
the mounting bracket (74-44226-01) and the rubber grommets (12-3173401) that are attached to the faulty disk drive and install these items on
the replacement drive. The following procedure describes how to remove
the mounting bracket and rubber grommets from an RZ25 disk drive. The
procedure for removing the mounting bracket and rubber grommets from an
RZ26 or RZ35 disk drive is the same. To remove the mounting bracket and
rubber grommets from an RZ25 disk drive, follow these steps:
1. Position the disk drive so that the bottom of the disk drive faces up.
2. Remove the four screws and attached grommets (see Figure 3–8). These
screws secure the mounting bracket to the disk drive.

Removing and Replacing FRUs 3–13

Removing and Replacing FRUs

Figure 3–8 Separating the Mounting Bracket from the RZ25 Disk Drive
Grommets (4)

Mounting
Bracket

RZ25 Disk Drive

RE_EN06497C_91

3. Remove the mounting bracket from the disk drive.
4. Keep the four screws with the attached grommets and the mounting
bracket in a safe place. You must install them on the replacement disk
drive.

3.3.3 Setting the SCSI ID on the Replacement Disk Drive
To set the SCSI ID on a replacement disk drive, follow these steps:
1. Note the SCSI ID switch settings on the disk drive you removed. The
locations of the SCSI ID jumper wires on the various types of disk drive
are shown in the following figures:
•

RZ23L—see Figure 3–9

3–14 Removing and Replacing FRUs

Removing and Replacing FRUs

•

RZ24—see Figure 3–10

•

RZ25—see Figure 3–11

•

RZ26—see Figure 3–12

•

RZ35—see Figure 3–13

2. Set the SCSI ID switches on the replacement disk drive to the same
settings as the SCSI ID switches of the disk drive you removed.
Figure 3–9 RZ23L Disk Drive SCSI ID Jumper Wire Locations

RE_EN06357A_91

Removing and Replacing FRUs 3–15

Removing and Replacing FRUs

Figure 3–10 RZ24 Disk Drive SCSI ID Jumper Wire Locations

SCSI Connector

E1 E2 E3

SCSI ID Jumper Wires

Power Connector
RE_EN05183A_90

3–16 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–11 RZ25 Disk Drive SCSI ID Jumper Wire Locations

RE_EN06365C_91

Removing and Replacing FRUs 3–17

Removing and Replacing FRUs

Figure 3–12 RZ26 Disk Drive SCSI ID Jumper Wire Locations

RE_EN06365C_91

3–18 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–13 RZ35 Disk Drive SCSI ID Jumper Wire Locations

RE_EN06365C_91

See the Options manual for more information about setting the SCSI ID of the
RZ-series disk drives.

3.4 Removing the Upper Drive-Mounting Shelf
To reach some of the FRUs in the BA42-B enclosure, you must remove the
upper drive-mounting shelf. Depending on the system configuration, the
upper drive-mounting shelf can contain one, two, or three disk drives. You
can remove the upper drive-mounting shelf with the disk drives attached. To
remove the upper drive-mounting shelf, follow these steps:
1. Remove the enclosure cover (see Section 3.1).

Removing and Replacing FRUs 3–19

Removing and Replacing FRUs

Note
When disconnecting the cables, you must note which cables connect to
which drives. On the SCSI cable, note the number on the connector
pull-tab.

2. Disconnect the power cable from the disk drives on the upper drivemounting shelf. Figure 1–3 shows the power cables in the BA42-B
enclosure.
3. Disconnect the power cable from the power supply unit. Remove the power
cable from the enclosure.
4. Disconnect the SCSI cables from the disk drives by pulling the pull-tabs.
Figure 1–4 shows the SCSI cables in the BA42-B enclosure.
5. Loosen the three captive screws (see Figure 3–14).

3–20 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–14 Removing the Upper Drive-Mounting Shelf
Captive
Screws (3)

Upper Drive
Mounting Shelf
RE_EN06232A_91

6. Lift the left side of the upper drive-mounting shelf, and pull the drivemounting shelf to the left until the tabs on the right side of the mounting
shelf are clear of the cutouts in the lower drive-mounting shelf.
7. Remove the upper drive-mounting shelf from the enclosure.

3.5 Removing an RZ-Series Disk Drive from the Lower
Drive-Mounting Shelf
Depending on the system configuration, RZ-series disk drives may be installed
on the left side and the right side of the lower drive-mounting shelf, when
viewed from the front. To remove an RZ-series disk drive from the lower
drive-mounting shelf, follow these steps:
1. Remove the enclosure cover (see Section 3.1).

Removing and Replacing FRUs 3–21

Removing and Replacing FRUs

2. Remove the upper drive-mounting shelf (see Section 3.4).
Note
•

You can disconnect the cables from a disk drive more easily
after you remove the drive from the drive-mounting shelf.

•

When disconnecting the cables, you must note which cables
connect to which drives. On the SCSI cable, note the number
on the connector pull-tab.

3. Press and hold the spring clip that locks the disk drive in position (see
Figure 3–15).
4. Push the disk drive towards the spring clip until the rubber grommets
under the disk drive are released from the cutouts in the drive-mounting
shelf (see Figure 3–15). Lift the disk drive up from the lower drivemounting shelf, and release the spring clip.

3–22 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–15 Removing an RZ-Series Disk Drive from the Lower DriveMounting Shelf

RZ24 Disk Drive

Spring Clip

RE_EN06233A_91

5. Disconnect the SCSI cable from the back of the disk drive by pulling the
pull-tab. Figure 1–4 shows the signal cables in the BA42-B enclosure.
6. Disconnect the power cable from the back of the disk drive. Figure 1–3
shows the power cables in the BA42-B enclosure.
7. Remove the support plate from the disk drive (see Section 3.3.1).

3.6 Removing the RX26 Diskette Drive Assembly
The RX26 diskette drive assembly (when installed) is positioned on the left
side or the right side of the lower drive-mounting shelf when viewed from the
front. The RX26 diskette drive assembly contains three FRUs as follows:
•

RX26-AA diskette drive

•

RX26 FDI/SCSI board (54-20764-02)

•

RX26 ribbon cable (17-00285-00)

Removing and Replacing FRUs 3–23

Removing and Replacing FRUs

The following procedure describes how to remove an RX26 diskette drive
assembly from the right side of the lower drive-mounting shelf. The procedure
for removing the RX26 diskette drive assembly from the left side of the lower
drive-mounting shelf is the same. To remove the RX26 diskette drive assembly
from the BA42-B enclosure, follow these steps:
1. Remove the enclosure cover (see Section 3.1).
2. Remove the upper drive-mounting shelf (see Section 3.4).
Note
When disconnecting the cables, you must note which cables connect to
which drives. On the SCSI cable, note the number on the connector
pull-tab.

3. Disconnect the power cable from the back of the RX26 diskette drive.
Figure 1–3 shows the power cables in the BA42-B enclosure.
4. Disconnect the power cable from the floppy diskette interface/small
computer system interface (FDI/SCSI) board.
5. Disconnect the SCSI cable from the back of the FDI/SCSI board by pulling
the pull-tab. Figure 1–4 shows the signal cables in the BA42-B enclosure.
6. Loosen the captive screw securing the mounting bracket to the lower
drive-mounting shelf (see Figure 3–16).

3–24 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–16 Removing the RX26 Diskette Drive Assembly
RX26 Diskette Drive
Captive Screw

RE_EN06234A_91

7. Lift the left side of the RX26 diskette drive assembly and pull the diskette
drive assembly to the left until the tabs on the right side of the mounting
bracket are clear of the cutouts in the lower drive-mounting shelf.
8. Lift the RX26 diskette drive assembly out of the BA42-B enclosure.

3.6.1 Removing the RX26 FDI/SCSI Board
To remove the FDI/SCSI board from the RX26 mounting bracket, follow these
steps:
1. Disconnect the ribbon cable that connects the RX26 diskette drive to the
RX26 FDI/SCSI board.
2. Turn the RX26 diskette drive assembly over so that the base of the
mounting bracket faces up.

Removing and Replacing FRUs 3–25

Removing and Replacing FRUs

3. Press firmly on the front edge of the FDI/SCSI board with your finger.
When the two holes on the front edge of the FDI/SCSI board are clear of
the tabs in the RX26 mounting bracket, slide the RX26 FDI/SCSI board out
of the RX26 mounting bracket (see Figure 3–17).
Figure 3–17 Removing the RX26 FDI/SCSI Board

Hole in RX26 FDI Board (2)
RE_EN06235A_91

3.6.2 Separating the RX26 Diskette Drive from the Mounting Bracket
When you are installing a replacement RX26 diskette drive, you must use the
mounting bracket (70-29669-01) that is attached to the faulty RX26 diskette
drive (RX26-AA). To separate the RX26 diskette drive from its mounting
bracket, follow these steps:
1. Remove the four screws (90-10961-03) securing the RX26 mounting bracket
to the RX26 diskette drive.
2. Separate the mounting bracket from the RX26 diskette drive (see
Figure 3–18).

3–26 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–18 Separating the Mounting Bracket from the RX26 Diskette Drive

Philips Screws (4)
RX26 Mounting Bracket
RX26 Diskette Drive

RE_EN06452A_91

3.6.3 Setting the SCSI ID on the Replacement RX26 FDI/SCSI Board
When replacing the FDI/SCSI board, you must set the SCSI ID of the
replacement board to the SCSI ID of the board you remove. To set the SCSI ID
on a replacement RX26 FDI/SCSI board, follow these steps:
1. Note the SCSI ID switch settings on the RX26 FDI/SCSI board you
removed. Figure 3–19 shows the location of the SCSI ID switches on the
FDI/SCSI board.
2. Set the SCSI ID switches on the replacement RX26 FDI/SCSI board to the
same settings as the SCSI ID switches of the RX26 FDI/SCSI board you
removed.

Removing and Replacing FRUs 3–27

Removing and Replacing FRUs

Figure 3–19 Location of the SCSI ID Switches on the RX26 FDI/SCSI Board

Note: The switch is off in the up position

SCSI ID Switches

RE_EN06236A_91

After you install the FDI/SCSI board and connect the RX26 ribbon cable, you
can reach the SCSI ID switches through a ventilation slot in the mounting
bracket (see Figure 3–20).

3–28 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–20 How to Reach the SCSI ID Switches on the RX26 FDI/SCSI
Board

Note: The SCSI ID shown is 4 (S1 is on, S2 is off, and S3 is off).
RE_EN06471A_91

3.7 Removing a TZ30 Tape Drive
The TZ30 tape drive (when installed) is on the right side of the lower drivemounting shelf, when viewed from the front. To remove a TZ30 tape drive from
the BA42-B enclosure, follow these steps:
1. Remove the enclosure cover (see Section 3.1).
2. Remove the upper drive-mounting shelf (see Section 3.4).

Removing and Replacing FRUs 3–29

Removing and Replacing FRUs

Note
•

You can disconnect the cables from the drive more easily after
you remove the drive from the drive-mounting shelf.

•

When disconnecting the cables, you must note which cables
connect to which drives. On the SCSI cable, note the number
on the connector pull-tab.

3. Loosen the captive screw that secures the mounting bracket to the
drive-mounting shelf (see Figure 3–21).
Figure 3–21 Removing a TZ30 Tape Drive
TZ30 Tape Drive
Captive Screw

GA_EN00202A_92A

4. Lift the left side of the TZ30 tape drive. Slide the TZ30 tape drive to the
left until the tabs on the right side of the mounting bracket are clear of the
cutouts in the drive-mounting shelf.

3–30 Removing and Replacing FRUs

Removing and Replacing FRUs

5. Disconnect the power cable from the flying lead connector of the TZ30 tape
drive. Figure 1–3 shows the power cables in the BA42-B enclosure.
6. Disconnect the SCSI cable from the TZ30 tape drive by pulling the pull-tab.
Figure 1–4 shows the signal cables in the BA42-B enclosure.
7. Lift the TZ30 tape drive, which has its mounting bracket attached, out of
the system unit.

3.7.1 Separating the TZ30 Tape Drive from the Mounting Bracket
When you are installing a replacement TZ30 tape drive, you must use the
mounting bracket (74-42115-01) that is attached to the faulty TZ30 tape drive
(TZ30-AA). To separate the mounting bracket from the faulty TZ30 tape drive,
follow these steps:
1. Remove the two screws (90-09984-07) from the right side of the mounting
bracket (see Figure 3–22).
2. Remove one screw (90-09984-07) from the left side of the mounting bracket
(see Figure 3–22).
3. Remove one screw (90-10961-03) from the bottom of the drive mounting
bracket (see Figure 3–22).
4. Separate the mounting bracket from the TZ30 tape drive.

Removing and Replacing FRUs 3–31

Removing and Replacing FRUs

Figure 3–22 Separating the Mounting Bracket from the TZ30 Tape Drive

Philips Screw

Philips Screws (3)
TZ30 Mounting Bracket
TZ30 Tape Drive
GA_EN00211A_92A

5. Keep the mounting bracket and the four screws in a safe place because you
must use them to install the replacement TZ30 tape drive.

3.7.2 Setting the SCSI ID on the Replacement TZ30 Tape Drive
To set the SCSI ID on the replacement TZ30 tape drive, follow these steps:
1. Note the SCSI ID switch settings on the TZ30 tape drive you removed.
Figure 3–23 shows the location of the SCSI ID switches and the
recommended SCSI ID for tape drives.
2. Set the SCSI ID switches on the replacement TZ30 tape drive to the same
settings as the SCSI ID switches on the TZ30 tape drive you removed.

3–32 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–23 TZ30 SCSI ID Switch Locations

4
3
2
1
On
Off
Notes: 1. S1 is not used (always on).
2. The SCSI ID shown is 5 (S2 is on, S3 is off, and S4 is on).
GA_EN00203A_92A

See the Options manual for more information about setting the SCSI ID of the
TZ30 tape drive.

3.8 Removing a TZK10 Tape Drive
The TZK10 tape drive (when installed) can be on the right side or the left side
of the lower drive-mounting shelf, when viewed from the front. The following
procedure describes how to remove a TZK10 tape drive from the right side
of the lower drive-mounting shelf. The procedure for removing the TZK10
tape drive from the left side of the lower drive-mounting shelf is the same. To
remove a TZK10 tape drive from the BA42-B enclosure, follow these steps:
1. Remove the enclosure cover (see Section 3.1).

Removing and Replacing FRUs 3–33

Removing and Replacing FRUs

2. Remove the upper drive-mounting shelf (see Section 3.4).
Note
•

You can disconnect the cables from the drive more easily after
you remove the drive from the drive-mounting shelf.

•

When you disconnect the cables, note which cables connect
to which drives. On the SCSI cable, note the number on the
connector pull-tab.

3. Loosen the captive screw that secures the mounting bracket to the
drive-mounting shelf (see Figure 3–24).

3–34 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–24 Removing the TZK10 Tape Drive
TZK10 Tape Drive
Captive Screw

GA_EN00204A_92A

4. Lift the left side of the TZK10 tape drive. Slide the TZK10 tape drive to
the left until the tabs on the right side of the mounting bracket are clear of
the cutouts in the lower drive-mounting shelf.
5. Disconnect the power cable from the back of the TZK10 tape drive.
Figure 1–3 shows the power cables in the BA42-B enclosure.
6. Disconnect the SCSI cable from the back of the TZK10 tape drive by
pulling the pull-tab. Figure 1–4 shows the signal cables in the BA42-B
enclosure.
7. Lift the TZK10 tape drive out of the system unit.

Removing and Replacing FRUs 3–35

Removing and Replacing FRUs

3.8.1 Separating the TZK10 Tape Drive from the Mounting Bracket
When you install a replacement TZK10 tape drive, you must use the mounting
bracket (74-42449-01) that is attached to the faulty TZK10 tape drive (TZK10AA). To separate the mounting bracket from the faulty TZK10 tape drive,
follow these steps:
1. Remove the four screws (90-10961-03) that secure the mounting bracket to
the TZK10 tape drive (see Figure 3–25).
2. Separate the mounting bracket from the TZK10 tape drive.
Figure 3–25 Separating the Mounting Bracket from the TZK10 Tape Drive

Philips Screws (4)
TZK10 Mounting Bracket
TZK10 Tape Drive

3–36 Removing and Replacing FRUs

GA_EN00205A_92A

Removing and Replacing FRUs

3. Keep the mounting bracket and the four screws in a safe place because you
must use them to install the replacement TZK10 tape drive.
Note
When you attach the mounting bracket to the replacement TZK10 tape
drive, align the holes on the mounting bracket that are marked by a Q
with the screw holes on the sides of the TZK10 tape drive.

3.8.2 Setting the SCSI ID of the Replacement TZK10 Tape Drive
To set the SCSI ID of the replacement TZK10 tape drive, follow these steps:
1. Note the positions of the SCSI ID jumper wires on the TZK10 tape drive
you removed. Figure 3–26 shows the location of the SCSI ID jumper wires
and the recommended SCSI ID for tape drives.
2. Set the SCSI ID jumper wires on the replacement TZK10 tape drive to
the same positions as the SCSI ID switches of the TZK10 tape drive you
removed.

Removing and Replacing FRUs 3–37

Removing and Replacing FRUs

Figure 3–26 Locations of the SCSI ID Jumper Wires on the TZK10 Tape
Drive

SCSI ID
Jumper Wires

Parity 2

1 0

SCSI ID
Select
Note: The SCSI ID shown is 5.
GA_EN00206A_92A

See the Options manual for more information about setting the SCSI ID of the
TZK10 tape drives.

3.9 Removing a TLZ06 Tape Drive
The TLZ06 tape drive (when installed) can be on the right side or the left side
of the lower drive-mounting shelf, when viewed from the front. The following
procedure describes how to remove a TLZ06 tape drive from the right side
of the lower drive-mounting shelf. The procedure for removing the TLZ06
tape drive from the left side of the lower drive-mounting shelf is the same. To
remove a TLZ06 tape drive from the BA42-B enclosure, follow these steps:

3–38 Removing and Replacing FRUs

Removing and Replacing FRUs

1. Remove the enclosure cover (see Section 3.1).
2. Remove the upper drive-mounting shelf (see Section 3.4).
Note
•

You can disconnect the cables from the drive more easily after
you remove the drive from the drive-mounting shelf.

•

When you disconnect the cables, note which cables connect
to which drives. On the SCSI cable, note the number on the
connector pull-tab.

3. Loosen the captive screw that secures the mounting bracket to the
drive-mounting shelf (see Figure 3–27).

Removing and Replacing FRUs 3–39

Removing and Replacing FRUs

Figure 3–27 Removing the TLZ06 Tape Drive
TLZ06 Tape Drive
Captive Screw

GA_EN00142A_92A

4. Lift the left side of the TLZ06 tape drive. Slide the TLZ06 tape drive to the
left until the tabs on the right side of the mounting bracket are clear of the
cutouts in the lower drive-mounting shelf.
5. Disconnect the power cable from the back of the TLZ06 tape drive.
Figure 1–3 shows the power cables in the BA42-B enclosure.
6. Disconnect the SCSI cable from the back of the TLZ06 tape drive by pulling
the pull-tab. Figure 1–4 shows the signal cables in the BA42-B enclosure.
7. Lift the TLZ06 tape drive out of the system unit.

3–40 Removing and Replacing FRUs

Removing and Replacing FRUs

3.9.1 Separating the TLZ06 Tape Drive from the Mounting Bracket
When you install a replacement TLZ06 tape drive, you must use the mounting
bracket (74-42449-01) that is attached to the faulty TLZ06 tape drive (TLZ06AA). To separate the mounting bracket from the faulty TLZ06 tape drive, follow
these steps:
1. Remove the four screws (90-10961-03) that secure the mounting bracket to
the TLZ06 tape drive (see Figure 3–28).
2. Separate the mounting bracket from the TLZ06 tape drive.
Figure 3–28 Separating the Mounting Bracket from the TLZ06 Tape Drive

Philips Screws (4)
TLZ06 Mounting Bracket
TLZ06 Tape Drive

GA_EN00143A_92A

Removing and Replacing FRUs 3–41

Removing and Replacing FRUs

3. Keep the mounting bracket and the four screws in a safe place because you
must use them to install the replacement TLZ06 tape drive.
Note
When you attach the mounting bracket to the replacement TLZ06 tape
drive, align the holes on the mounting bracket that are marked by a Q
with the screw holes on the sides of the TLZ06 tape drive.

3.9.2 Setting the SCSI ID and Option Switches of the Replacement
TLZ06 Tape Drive
To set the SCSI ID and option switches of the replacement TLZ06 tape drive,
follow these steps:
1. Note the positions of the SCSI ID and option switches on the TLZ06 tape
drive you removed. Figure 3–29 shows the location of the SCSI ID and
option switches and the recommended SCSI ID for tape drives.
2. Set the SCSI ID and option switches on the replacement TLZ06 tape drive
to the same positions as the SCSI ID switches of the TLZ06 tape drive you
removed.

3–42 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–29 Locations of the SCSI ID and Option Switches on the TLZ06
Tape Drive

O
F
F

Mode and SCSI
Address Switches

GA_EN00144A_92A

See the Options manual for more information about setting the SCSI ID and
option switches on TLZ06 tape drives.

3.10 Removing an RRD42 CD-ROM Drive
The RRD42 CD-ROM drive (when installed) is on the left side of the lower
drive-mounting shelf, when viewed from the front. To remove an RRD42
CD-ROM drive from the BA42-B enclosure, follow these steps:
1. Remove the enclosure cover (see Section 3.1).

Removing and Replacing FRUs 3–43

Removing and Replacing FRUs

2. Remove the upper drive-mounting shelf (see Section 3.4).
Note
•

You can disconnect the cables from the drive more easily after
you remove the drive from the drive-mounting shelf.

•

When you disconnect the cables, you must note which cables
connect to which drives. On the SCSI cable, note the number
on the connector pull-tab.

3. Loosen the captive screw that secures the mounting bracket to the
drive-mounting shelf (see Figure 3–30).

3–44 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–30 Removing the RRD42 CD-ROM Drive

Captive Screw

RRD42 CDROM Drive

GA_EN00207A_92A

4. Lift the right side of the RRD42 CD-ROM drive. Slide the RRD42 CD-ROM
drive to the right until the tabs on the left side of the mounting bracket are
clear of the cutouts in the lower drive-mounting shelf.
5. Disconnect the power cable from the back of the RRD42 CD-ROM drive.
Figure 1–3 shows the power cables in the BA42-B enclosure.
6. Disconnect the SCSI cable from the back of the RRD42 CD-ROM drive by
pulling the pull-tab. Figure 1–4 shows the signal cables in the BA42-B
enclosure.
7. Lift the RRD42 CD-ROM drive, which has its bracket attached, out of the
system unit.
Caution
The RRD42 CD-ROM drive has a plastic cover that protects the drive
from dust. Do not remove this cover when replacing the RRD42

Removing and Replacing FRUs 3–45

Removing and Replacing FRUs

CD-ROM drive or setting the SCSI ID.

3.10.1 Separating the RRD42 CD-ROM Drive from the Mounting Bracket
When you install a replacement RRD42 CD-ROM drive, you must use the
mounting bracket (74-42449-01) that is attached to the faulty RRD42 CD-ROM
drive (RRD42-AA). To separate the mounting bracket from the faulty RRD42
CD-ROM drive, follow these steps:
1. Remove the four screws (90-10961-03) that secure the mounting bracket to
the RRD42 CD-ROM drive.
2. Separate the mounting bracket from the RRD42 CD-ROM drive (see
Figure 3–31).
Figure 3–31 Separating the Mounting Bracket from the RRD42 CD-ROM
Drive

RRD42 CDROM Drive
RRD42 Mounting Bracket
Philips Screws (4)

GA_EN00208A_92A

3. Keep the mounting bracket and the four screws in a safe place because you
must use the same bracket and screws to install the replacement RRD42
CD-ROM drive.

3–46 Removing and Replacing FRUs

Removing and Replacing FRUs

Note
When you attach the mounting bracket to the replacement RRD42
CD-ROM drive, align the holes on the mounting bracket that are
not marked by a Q with the screw holes on the sides of the RRD42
CD-ROM drive.

3.10.2 Setting the SCSI ID on the Replacement RRD42 CD-ROM Drive
To set the SCSI ID on the replacement RRD42 CD-ROM drive, follow these
steps:
1. Note the SCSI ID jumper wires on the RRD42 CD-ROM drive you removed.
Figure 3–32 shows the location of the SCSI ID jumper wires.
2. Set the SCSI ID jumper wires on the replacement RRD42 CD-ROM drive
to the same positions as the SCSI ID jumper wires on the RRD42 CD-ROM
drive you removed.

Removing and Replacing FRUs 3–47

Removing and Replacing FRUs

Figure 3–32 RRD42 SCSI ID Jumper Wire Locations

SCSI ID
Jumper Wires

Parity

2
Note: The SCSI ID shown is 4.
GA_EN00209A_92A

See the Options manual for more information about setting the SCSI ID of the
RRD42 CD-ROM drive.

3.11 Removing the Upper and Lower Drive-Mounting Shelf
Combination
Caution
Static electricity can damage integrated circuits. Wear a wrist strap
and place an antistatic mat under the system unit when working with
the internal parts of the system unit.

3–48 Removing and Replacing FRUs

Removing and Replacing FRUs

To reach the CPU module and some of the components that connect to it, you
must remove the upper drive-mounting shelf and the lower drive-mounting
shelf. To save time, you can remove both of the drive-mounting shelves as
one unit with the devices and cables in place. To remove the upper and lower
drive-mounting shelf combination, follow these steps:
1. On the power supply unit, disconnect the power cables that supply power
to the upper and lower drive-mounting shelves.
2. Loosen the two captive screws that secure the upper drive-mounting shelf
to the power supply unit (see Figure 3–33).
3. Loosen the two captive screws that secure the lower drive-mounting shelf
to the enclosure (see Figure 3–33).
4. Loosen the two Philips screws (90-09984-07) that secure the lower
drive-mounting shelf to the enclosure (see Figure 3–33).

Removing and Replacing FRUs 3–49

Removing and Replacing FRUs

Figure 3–33 Removing the Upper and Lower Drive-Mounting Shelf
Combination
Captive
Screws (2)
Power
Supply
Unit

Captive
Screws (2)
Upper Drive
Mounting Shelf
Lower Drive
Mounting Shelf
Philips Screws (2)

RE_EN06291A_91

5. Slide the upper and lower drive-mounting shelf combination towards the
front of the enclosure as far as it will go.
Caution
When you disconnect the SCSI cable from the CPU module, ensure that
you do not damage any of the MS44 or MS44L memory modules.

6. Disconnect the SCSI cable from the CPU module (see Figure 3–34).

3–50 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–34 Disconnecting the SCSI Cable
SCSI Cable

RE_EN06244A_91

7. Lift the upper and lower drive-mounting shelf combination out of the
system enclosure with the devices and cables in place.

3.12 Removing the SCSI Cable
To remove the SCSI cable from the BA42-B enclosure, follow these steps:
1. Remove the upper and lower drive-mounting shelf combination (see
Section 3.11).
2. Disconnect the SCSI cable from the disk drives on the upper drivemounting shelf.
3. Loosen the captive screw that secures the upper drive-mounting shelf to
the lower drive-mounting shelf (see Figure 3–35).

Removing and Replacing FRUs 3–51

Removing and Replacing FRUs

Figure 3–35 Separating the Upper Drive-Mounting Shelf from the Lower
Drive-Mounting Shelf

Captive Screw

Upper Drive
Mounting Shelf

Lower Drive
Mounting Shelf

RE_EN06490A_91

4. Lift the left side of the upper drive-mounting shelf and slide it to the
left until the tabs on the right side of the upper drive-mounting shelf are
released from the cutouts in the lower drive-mounting shelf.
5. Disconnect the SCSI cable from the mass storage devices on the lower
drive-mounting shelf.
To release the SCSI cable, follow steps six to eight for Model 40 and Model 80
systems or step nine for Model 90 systems:
6. Push the tab on the cable clamp (90-11237-01) (see Figure 3–36), and tilt
the cable clamp towards the back of the lower drive-mounting shelf.

3–52 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–36 Releasing the SCSI Cable Clamp (Model 40 and Model 80 Only)

Cable Clamp

Lower Drive
Mounting Shelf
RE_EN06491A_91

7. Release the cable clamp from its cutout in the lower drive-mounting shelf.
8. Turn the cable and the cable clamp through 90° and slide the cable out
through the slot in the lower drive-mounting shelf (see Figure 3–36).
The next step is for model 90 systems only.
9. Twist the cable through 90° and pull through the slot as shown in
Figure 3–37.

Removing and Replacing FRUs 3–53

Removing and Replacing FRUs

Figure 3–37 Releasing the SCSI Cable (Model 90 Only)

Cable Clamp

Lower Drive
Mounting Shelf
RE_EN06491A_91

3.13 Removing the DSW42 Synchronous Communications
Option
The DSW42 synchronous communications option contains three components
that you must remove from the CPU module as follows:
•

A logic board (54-20640-01)

•

An input/output cable (17-02942-01)

•

An input/output module (70-28542-01)

3–54 Removing and Replacing FRUs

Removing and Replacing FRUs

To remove the DSW42 synchronous communications option from the BA42-B
enclosure, follow these steps:
1. Remove the enclosure cover (see Section 3.1).
2. Remove the upper and lower drive-mounting shelf combination (see
Section 3.11).
3. Remove the logic board, the input/output cable, and the input/output
module according to the procedures in the following subsections.

3.13.1 Removing the DSW42 Logic Board

Caution
Static electricity can damage integrated circuits. Wear a wrist strap
and place an antistatic mat under the system unit when working with
the internal parts of the system unit.

1. Press the latch on one of the standoff pillars (see Figure 3–38) and push
up the corner of the DSW42 logic board until the DSW42 logic board is
released.
Note
The standoff pillars contain two components: a push-button rivet
(12-35477-02) and a standoff (12-35477-03). On model 90 systems, the
standoff pillars are in the opposite corners to the standoff pillars on
model 40 and 80 logic boards.

Removing and Replacing FRUs 3–55

Removing and Replacing FRUs

Figure 3–38 Removing the DSW42 Logic Board

Standoff Pillars (2)

DSW42 Logic Board

CPU Module

GA_EN00099A_92A

2. Press the latch on the other standoff pillar and push up that corner of the
DSW42 logic board until the DSW42 logic board is released.
3. Push up the DSW42 logic board until the connectors on the DSW42 logic
board disengage from the connectors on the CPU module (see Figure 3–38).
4. Remove the DSW42 logic board from the enclosure.

3.13.2 Removing the DSW42 Input/Output Cable
To remove the DSW42 input/output cable, follow these steps:
1. Disconnect the DSW42 input/output cable from the CPU module (see
Figure 3–39).
2. Disconnect the DSW42 input/output cable from the DSW42 input/output
module on the back of the enclosure (see Figure 3–39).

3–56 Removing and Replacing FRUs

Removing and Replacing FRUs

3. Remove the DSW42 input/output cable from the enclosure.
Figure 3–39 Removing the DSW42 Input/Output Cable
DSW42 Input/Output Module
DSW42 Input/Output Cable

CPU Module

RE_EN06248A_91

3.13.3 Removing the DSW42 Input/Output Module
To remove the DSW42 input/output module, follow these steps:
1. Disconnect the external cables that connect to synchronous ports 0 and 1
on the back of the system unit (if not already disconnected).
2. Disconnect the DSW42 input/output cable from the DSW42 input/output
module (if not already disconnected).
3. Press the spring clip on the DSW42 input/output module. Pull the DSW42
input/output module towards the front of the enclosure until it is released
from the back of the enclosure (see Figure 3–40).

Removing and Replacing FRUs 3–57

Removing and Replacing FRUs

4. Lift up and remove the DSW42 input/output module from the enclosure.
Figure 3–40 Removing the DSW42 Input/Output Module
Spring Clip
DSW42 Input/Output Module

RE_EN06249A_91

3.14 Removing the DHW42 Asynchronous Communications
Option
The DHW42 asynchronous communications option contains three components
that you must remove from the system enclosure as follows:
•

A logic board (54-20662-01)

•

An input/output cable (17-02942-01)

•

One of the following input/output modules:
8 data-only line input/output module (70-28542-02)
16 data-only line input/output module (70-28542-03)

3–58 Removing and Replacing FRUs

Removing and Replacing FRUs

8 modem control line input/output module (70-28543-01)
To remove the DHW42 asynchronous communications option from the BA42-B
enclosure, follow these steps:
1. Remove the enclosure cover (see Section 3.1).
2. Remove the upper and lower drive-mounting shelf combination (see
Section 3.11).
3. Remove the logic board, the input/output cable, and the input/output
module according to the procedures in the following subsections.

3.14.1 Removing the DHW42 Logic Board

Caution
Static electricity can damage integrated circuits. Wear a wrist strap
and place an antistatic mat under the system unit when working with
the internal parts of the system unit.

1. Press the latch on one of the standoff pillars (see Figure 3–41) and push
up the corner of the DHW42 logic board until the DHW42 logic board is
released.
Note
•

On Model 90 systems, the DHW42 logic board is located on the
left hand side of the KA50 CPU module.

•

The standoff pillars contain two components: a push-button
rivet (12-35477-02) and a standoff (12-35477-03).

Removing and Replacing FRUs 3–59

Removing and Replacing FRUs

Figure 3–41 Removing the DHW42 Logic Board
Standoff Pillars (2)

DHW42 Logic Board

CPU Module

GA_EN00098A_92A

2. Press the latch on the other standoff pillar and push up the corner of the
DHW42 logic board until the latch releases the DHW42 logic board.
3. Push up the DHW42 logic board until the connectors on the DHW42 logic
board disengage from the connectors on the CPU module (see Figure 3–41).
4. Remove the DHW42 logic board from the enclosure.

3.14.2 Removing the DHW42 Input/Output Cable
To remove the DHW42 input/output cable, follow these steps:
1. Disconnect the DHW42 input/output cable from the CPU module (see
Figure 3–42).
2. Disconnect the DHW42 input/output cable from the DHW42 input/output
module on the back of the enclosure (see Figure 3–42).

3–60 Removing and Replacing FRUs

Removing and Replacing FRUs

3. Remove the DHW42 input/output cable from the enclosure.
Figure 3–42 Removing the DHW42 Input/Output Cable
DHW42 Input/Output Module
DHW42 Input/Output Cable

CPU Module

RE_EN06251A_91

3.14.3 Removing the DHW42 Input/Output Module
To remove the DHW42 input/output module, follow these steps:
1. Disconnect the external cables that are connected to asynchronous ports A
and B on the back of the system unit (if not already disconnected).
2. Disconnect the DHW42 input/output cable from the DHW42 input/output
module (if not already disconnected).
3. Press the spring clip on the DHW42 input/output module. Pull the DHW42
input/output module towards the front of the enclosure until it is released
from the back of the enclosure (see Figure 3–43).

Removing and Replacing FRUs 3–61

Removing and Replacing FRUs

4. Lift up and remove the DHW42 input/output module from the enclosure.
Figure 3–43 Removing the DHW42 Input/Output Module

Spring Clip
DHW42 Input/Output Module

RE_EN06252A_91

3–62 Removing and Replacing FRUs

Removing and Replacing FRUs

3.15 Removing the CPU Module
To remove the CPU module from the BA42-B enclosure, follow these steps:
1. Disconnect the external cables, loopback connectors, and terminators from
the back of the system unit.
2. Remove the enclosure cover (see Section 3.1).
3. Remove the upper and lower drive-mounting shelf combination (see
Section 3.11).
4. If installed, remove the DSW42 logic board (see Section 3.13.1) and
disconnect the DSW42 input/output cable from the CPU module (see
Section 3.13.2).
5. If installed, remove the DHW42 logic board (see Section 3.14.1) and
disconnect the DHW42 input/output cable from the CPU module (see
Section 3.14.2).
6. Disconnect the MS44 or MS44L memory modules from the CPU module
(see Section 3.2).
7. Disconnect the power cable from the CPU module (see Figure 3–44).
8. Disconnect the 3.3 V dc cable (17-03136-01, Model 80 systems only) from
the CPU module (see Figure 3–44).

Removing and Replacing FRUs 3–63

Removing and Replacing FRUs

Figure 3–44 Disconnecting the Cables from the CPU Module

3.3 V dc Cable
(Model 80 System Only)

SCSI Ribbon Cable
Power Cable

CPU Module
RE_EN06253A_91

9. Disconnect the SCSI ribbon cable (17-02944-01) from the CPU module (see
Figure 3–44).
Caution
Ensure that you do not damage any of the CPU module components by
exerting too much force on the components.

3–64 Removing and Replacing FRUs

Removing and Replacing FRUs

10. Press the two spring clips (marked by arrows in Figure 3–45) that secure
the CPU module in position. The CPU module moves forward under the
tension of the connector gaskets. If necessary, slide the CPU module back
until it disengages from the ten keyhole cutouts (see Figure 3–45).
11. Use your finger, in the semicircular cutout on the front edge of the CPU
module, to lift up the front edge of the CPU module (see Figure 3–45).
12. While supporting the front of the CPU module with one hand, guide the
connectors on the back of the CPU module out of the corresponding cutouts
on the back of the enclosure.
13. Carefully remove the Ethernet ID ROM from the CPU module. You must
install this ROM in the replacement CPU module.
14. Remove the CPU module from the enclosure.

Removing and Replacing FRUs 3–65

Removing and Replacing FRUs

Figure 3–45 Removing the CPU Module

CPU Module

Keyhole Cutouts (10)

Ethernet ID ROM

Spring Clips
PUSH

PUSH

Semicircular Cutout

RE_EN06254A_91

3–66 Removing and Replacing FRUs

Removing and Replacing FRUs

3.16 Replacing the CPU Module
To install a replacement CPU module in a BA42-B enclosure, follow these
steps:
Caution
Static electricity can damage integrated circuits. Wear a wrist strap
and place an antistatic mat under the system when working with the
internal parts of the system unit.

Caution
You can damage the ROM or the CPU module by installing the ROM
with an incorrect orientation.

1. Install the Ethernet ID ROM that you removed from the original CPU
module on the replacement CPU module. Figure 3–46 shows the location
and orientation of the Ethernet ID ROM for models 40 and 80. Figure 3–47
shows the location and orientation of the Ethernet ID ROM for models 90.

Removing and Replacing FRUs 3–67

Removing and Replacing FRUs

Figure 3–46 Location and Orientation of the Ethernet ID ROM for Models 40
and 80

CPU Module

Pin 1
Ethernet ID ROM

PUSH

RE_EN06478A_91

3–68 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–47 Location and Orientation of the Ethernet ID ROM for Model 90

CPU Module

Pin 1
Ethernet ID ROM

PUSH

GA_EN00145A_92A

2. Place the CPU module in the enclosure so that the connectors on the
CPU module align with the corresponding cutouts in the back panel of the
enclosure. Use the ThinWire Ethernet port as an anchor point to adjust
the position of the CPU module correctly.
3. Align the keyhole cutouts in the CPU module with the corresponding
standoff pillars in the base of the enclosure.
Caution
Ensure that you do not damage any of the CPU module components by
exerting pressure on the components.

4. Press the CPU module at the two positions marked push. The spring clips
push the standoff pillars into the keyhole cutouts that secure the CPU
module in position.
5. Connect the SCSI ribbon cable (17-02944-01) to the CPU module (see
Figure 3–44 for the location of the SCSI ribbon cable).
6. Connect the power cable (Model 40) or the power cables (Model 80) to the
CPU module (see Figure 3–44 for the location of the power cables).

Removing and Replacing FRUs 3–69

Removing and Replacing FRUs

7. Install the MS44 and MS44L memory modules that you removed from the
original CPU module. Follow the steps in Section 3.2 in reverse order to
install the memory modules
8. Install the DSW42 logic board, and connect the DSW42 input/output cable
if fitted. Follow the steps in Section 3.13.1 and Section 3.13.2 in reverse
order to install the logic board and cable.
9. Install the DHW42 logic board, and connect the DHW42 input/output cable
if fitted. Follow the steps in Section 3.14.1 and Section 3.14.2 in reverse
order to install the logic board and cable.
10. Install the upper and lower drive-mounting shelf combination. Follow the
steps in Section 3.11 in reverse order to install the drive-mounting shelf
combination.
11. Install the enclosure cover. Follow the steps in Section 3.1 in reverse order
to install the cover.

3.17 Removing the Power Supply Unit
Note
In MicroVAX 3100 platform systems, the power supply unit (30-3504201) is a single FRU. It does not have any replaceable components.

To remove the power supply unit from the BA42-B enclosure, follow these
steps:
1. Disconnect the power supply.
2. Remove the enclosure cover (see Section 3.1).
3. Remove the upper and lower drive-mounting shelf combination (see
Section 3.11).
4. Disconnect the power cable and the 3.3 V dc cable (Model 80 systems only)
from the CPU module (see Figure 3–44).
5. Loosen the two captive screws (see Figure 3–48).

3–70 Removing and Replacing FRUs

Removing and Replacing FRUs

Figure 3–48 Removing the Power Supply Unit
Power Supply Unit
Captive Screws (2)

Philips Screws (2)

RE_EN06255A_91

6. Loosen the two Philips screws (90-09984-07) that secure the power supply
unit to the left side of the enclosure (see Figure 3–48).
Caution
Ensure that you do not damage any of the MS44 or MS44L memory
modules when you lift the power supply unit out of the enclosure.

7. Lift the front of the power supply unit (see Figure 3–48).
8. Remove the power supply unit from the enclosure.

Removing and Replacing FRUs 3–71

A
Pin Specifications for the Ports on the
BA42-B System
Figure A–1 shows the pin specifications for the ports on the BA42-B system.

Pin Specifications for the Ports on the BA42-B System A–1

Pin Specifications for the Ports on the BA42-B System

Figure A–1 Pin Specifications for the Ports on the BA42-B System
100 V ac to 120 V ac
or
220 V ac to 240 V ac
at 50 Hz or 60 Hz

1
2
3
4
5
6
7
8
9
10
11
12
13
14

−12 V dc (Blue)
Ground (Black)
Ground (Black)
Ground (Black)
+5.1 V dc (Red)
+5.1 V dc (Red)
+3.5 V dc to 5.25 V dc (Brown)
+5.1 V dc (Red)
+12.1 V dc (Orange)
+5.1 V dc (Red)
Ground (Black)
Ground (Black)
−9 V dc (Yellow)
−9 V dc Return (White)

1
2
3
4
5
6
7
8
9
10
11
12
13
14

1
2
3

+3.3 V dc
Ground
+3.3 V dc Return

1
2
3

1
2
3
4

+12.1 V dc (Orange)
Ground (Black)
Ground (Black)
+5.1 V dc (Red)

To Drives
on Upper Shelf

1
2
3
4

+12.1 V dc (Orange)
Ground (Black)
Ground (Black)
+5.1 V dc (Red)

To Drives
on Lower Shelf

Power
Supply

CPU
Module

To and from
Internal
SCSI Devices
To and from
External
SCSI Devices
(See Table A−4)

Asynchronous
Communications
Option

+5 V dc (pullup)
Tx Data +
Tx Data −
Rx Data +
Rx Data −
3 kohm to ground

1
2
3
4
5
6

MMJ
Port 0

+5 V dc (pullup)
Tx Data +
Tx Data −
Rx Data +
Rx Data −
3 kohm to ground

1
2
3
4
5
6

MMJ
Port 1

+5 V dc (pullup)
Tx Data +
Tx Data −
Rx Data +
Rx Data −
3 kohm to ground

1
2
3
4
5
6

MMJ
Port 3

Chassis Ground
TX
RX
RTS
CTS
DSR
Signal Ground
CD
SPD
LLKB
DTR
RI
DSRS
TMI

1
2
3
4
5
6
7
8
12
18
20
22
23
25

Asynchronous
Modem Control
Port 2

Chassis Ground
Collision +
Transmit +
Receive +
+12 V dc Return
Collision −
Transmit −
Receive −
+12 V dc, fuse protected

1
2
3
5
6
9
10
12
13

Standard
Ethernet
Port

Synchronous
Communications
Option

ThinWire
Ethernet
Port
(Coaxial)

Asynchronous Option I/O
Synchronous Option I/O
(See Table A−1 for 8−data or 16−data only option.
(See Table A−3)
See Table A−2 for 8−modem control option)
GA_EN00210R_92A

A–2 Pin Specifications for the Ports on the BA42-B System

Pin Specifications for the Ports on the BA42-B System

Table A–1 Asynchronous Port A and Port B Pin Specifications for the EightData and 16-Data Line Options
Port B 1

Port A
2

Signal Name 2

Contact

Signal Name

LINE 0 TRANSMIT H

LINE 8 TRANSMIT H

LINE 0 RECEIVE H

LINE 8 RECEIVE H

LINE 1 TRANSMIT H

LINE 9 TRANSMIT H

LINE 1 RECEIVE H

LINE 9 RECEIVE H

LINE 2 TRANSMIT H

LINE 10 TRANSMIT H

LINE 2 RECEIVE H

LINE 10 RECEIVE H

LINE 3 TRANSMIT H

LINE 11 TRANSMIT H

LINE 3 RECEIVE H

LINE 11 RECEIVE H

LINE 4 TRANSMIT H

LINE 12 TRANSMIT H

LINE 4 RECEIVE H

LINE 12 RECEIVE H

LINE 5 TRANSMIT H

LINE 13 TRANSMIT H

LINE 5 RECEIVE H

LINE 13 RECEIVE H

LINE 6 TRANSMIT H

LINE 14 TRANSMIT H

LINE 6 RECEIVE H

LINE 14 RECEIVE H

LINE 7 TRANSMIT H

LINE 15 TRANSMIT H

LINE 7 RECEIVE H

LINE 15 RECEIVE H

150 OHMS TO GROUND

LINE 0 TRANSMIT L

LINE 8 TRANSMIT L

LINE 0 RECEIVE L

LINE 8 RECEIVE L

LINE 1 TRANSMIT L

LINE 9 TRANSMIT L

LINE 1 RECEIVE L

LINE 9 RECEIVE L

LINE 2 TRANSMIT L

LINE 10 TRANSMIT L

LINE 2 RECEIVE L

LINE 10 RECEIVE L

LINE 3 TRANSMIT L

LINE 11 TRANSMIT L

LINE 3 RECEIVE L

LINE 11 RECEIVE L

1 Not applicable to eight-data line option.
2 The signal names ending with L are active low; the signal names ending with H are active high.

(continued on next page)

Pin Specifications for the Ports on the BA42-B System A–3

Pin Specifications for the Ports on the BA42-B System

Table A–1 (Cont.) Asynchronous Port A and Port B Pin Specifications for the
Eight-Data and 16-Data Line Options
Port B 1

Port A
2

Signal Name 2

Contact

Signal Name

LINE 4 TRANSMIT L

LINE 12 TRANSMIT L

LINE 4 RECEIVE L

LINE 12 RECEIVE L

LINE 5 TRANSMIT L

LINE 13 TRANSMIT L

LINE 5 RECEIVE L

LINE 13 RECEIVE L

LINE 6 TRANSMIT L

LINE 14 TRANSMIT L

LINE 6 RECEIVE L

LINE 14 RECEIVE L

LINE 7 TRANSMIT L

LINE 15 TRANSMIT L

LINE 7 RECEIVE L

LINE 15 RECEIVE L

150 OHMS TO GROUND

1 Not applicable to eight-data line option.
2 The signal names ending with L are active low; the signal names ending with H are active high.

Table A–2 Asynchronous Port A and Port B Pin Specifications for the EightModem Control Line Option
Port A

Port B

Contact

Signal Name 1

LINE 0 TX CONN L

LINE 4 TX CONN L

LINE 0 RX CONN L

LINE 4 RX CONN L

LINE RTS CONN<0> H

LINE RTS CONN<4> H

LINE 0 CTS CONN H

LINE 4 CTS CONN H

LINE 0 DSR CONN H

LINE 4 DSR CONN H

LINE 0 SGND CONN L

LINE 4 SGND CONN L

LINE 0 CD CONN H

LINE 4 CD CONN H

LINE 0 SPDMI CONN H

LINE 4 SPDMI CONN H

LINE DTR CONN<0> H

LINE DTR CONN<4> H

1 The signal names ending with L are active low; the signal names ending with H are active high.

(continued on next page)

A–4 Pin Specifications for the Ports on the BA42-B System

Pin Specifications for the Ports on the BA42-B System

Table A–2 (Cont.) Asynchronous Port A and Port B Pin Specifications for the
Eight-Modem Control Line Option
Port A

Port B

Contact

Signal Name 1

LINE 0 RI CONN H

LINE 4 RI CONN H

LINE DSRS CONN<0> H

LINE DSRS CONN<4> H

LINE 1 TX CONN L

LINE 5 TX CONN L

LINE 1 RX CONN L

LINE 5 RX CONN L

LINE RTS CONN<1> H

LINE RTS CONN<5> H

LINE 1 CTS CONN H

LINE 5 CTS CONN H

LINE 1 DSR CONN H

LINE 5 DSR CONN H

LINE 1 SGND CONN L

LINE 5 SGND CONN L

LINE 1 CD CONN H

LINE 5 CD CONN H

LINE 1 SPDMI CONN H

LINE 5 SPDMI CONN H

LINE DTR CONN<1> H

LINE DTR CONN<5> H

LINE 1 RI CONN H

LINE 5 RI CONN H

23
24

LINE DSRS CONN<1> H

LINE DSRS CONN<5> H

LINE 2 TX CONN L

LINE 6 TX CONN L

LINE 2 RX CONN L

LINE 6 RX CONN L

LINE RTS CONN<2> H

LINE RTS CONN<6> H

LINE 2 CTS CONN H

LINE 6 CTS CONN H

LINE 2 DSR CONN H

LINE 6 DSR CONN H

LINE 2 SGND CONN L

LINE 6 SGND CONN L

LINE 2 CD CONN H

LINE 6 CD CONN H

LINE 2 SPDMI CONN H

LINE 6 SPDMI CONN H

LINE DTR CONN<2> H

LINE DTR CONN<6> H

LINE 2 RI CONN H

LINE 6 RI CONN H

LINE DSRS CONN<2> H

LINE DSRS CONN<6> H

35
36

1 The signal names ending with L are active low; the signal names ending with H are active high.

(continued on next page)

Pin Specifications for the Ports on the BA42-B System A–5

Pin Specifications for the Ports on the BA42-B System

Table A–2 (Cont.) Asynchronous Port A and Port B Pin Specifications for the
Eight-Modem Control Line Option
Port A

Port B

Contact

Signal Name 1

LINE 3 TX CONN L

LINE 7 TX CONN L

LINE 3 RX CONN L

LINE 7 RX CONN L

LINE RTS CONN<3> H

LINE RTS CONN <7> H

LINE 3 CTS CONN H

LINE 7 CTS CONN H

LINE 3 DSR CONN H

LINE 7 DSR CONN H

LINE 3 SGND CONN L

LINE 7 SGND CONN L

LINE 3 CD CONN H

LINE 7 CD CONN H

LINE 3 SPDMI CONN H

LINE 7 SPDMI CONN H

LINE DTR CONN<3> H

LINE DTR CONN<7> H

LINE 3 RI CONN H

LINE 7 RI CONN H

LINE DSRS CONN<3> H

LINE DSRS CONN<7> H

47
48
49
50
1 The signal names ending with L are active low; the signal names ending with H are active high.

Table A–3 Pin Specifications for Synchronous Port 0 and Port 1
Port 0

Port 1

Contact

Signal Name 1

CODE GND 1 L

CODE GND 2 L

CODE0 1 L

CODE0 2 L

CODE1 1 L

CODE1 2 L

CODE2 1 L

CODE2 2 L

CODE3 1 L

CODE3 2 L

TXDATA(B) 1 P L

TXDATA(B) 2 P L

1 The signal names ending with L are active low; the signal names ending with H are active high.

(continued on next page)

A–6 Pin Specifications for the Ports on the BA42-B System

Pin Specifications for the Ports on the BA42-B System

Table A–3 (Cont.) Pin Specifications for Synchronous Port 0 and Port 1
Port 0

Port 1

Contact

Signal Name 1

TXDATA(A) 1 P H

TXDATA(A) 2 P H

TXDATA 1 P L

TXDATA 2 P L

RTS/C A 1 P L

RTS/C A 2 P L

RTS/C B 1 P L

RTS/C B 2 P L

RX DATA A 1 P L

RX DATA A 2 P L

RX DATA B 1 P L

RX DATA B 2 P L

LOCAL LOOP 1 P H

LOCAL LOOP 2 P H

TEST 4 1 P L

TEST 4 2 P L

TEST 11 1 P H

TEST 11 2 P H

REM LOOP 1 P H

REM LOOP 2 P H

R1 1 P H

R1 2 P H

RXCLOCK A 1 P L

RXCLOCK A 2 P L

RXCLOCK B 1 P H

RXCLOCK B 2 P H

TXCLOCK A 1 P L

TXCLOCK A 2 P L

TXCLOCK B 1 P H

TXCLOCK B 2 P H

CLOCK 1 P L

CLOCK 2 P L

V35 TXCLK A 1 P L

V35 TXCLK A 2 P L

V35 TXCLK B 1 P H

V35 TXCLK B 2 P H

V35 CLK A 1 P L

V35 CLK A 2 P L

V35 CLK B 1 P H

V35 CLK B 2 P H

V35 RX A 1 P L

V35 RX A 2 P L

V35 RX B 1 P H

V35 RX B 2 P H

V35 TX A 1 P L

V35 TX A 2 P L

V35 TX B 1 P H

V35 TX B 2 P H

V35 RXCLK A 1 P L

V35 RXCLK A 2 P L

V35 RXCLK B 1 P H

V35 RXCLK B 2 P H

DTR 1 P H

DTR 2 P H

1 The signal names ending with L are active low; the signal names ending with H are active high.

(continued on next page)

Pin Specifications for the Ports on the BA42-B System A–7

Pin Specifications for the Ports on the BA42-B System

Table A–3 (Cont.) Pin Specifications for Synchronous Port 0 and Port 1
Port 0

Port 1

Contact

Signal Name 1

DSR A 1 P H

DSR A 2 P H

DSR B 1 P L

DSR B 2 P L

RTS 1 P L

RTS 2 P L

DCD/I A 1 P H

DCD/I A 2 P H

DCD/I B 1 P L

DCD/I B 2 P L

CTS A 1 P H

CTS A 2 P H

CTS B 1 P L

CTS B 2 P L

TEST 1 1 P H

TEST 1 2 P H

TEST 2 1 P H

TEST 2 2 P H

DTE GND 1 PROT L

DTE GND 2 PROT L

DTR A 1 P H

DTR A 2 P H

DTR B 1 P L

DTR B 2 P L

CLOCK A 1 P L

CLOCK A 2 P L

CLOCK B 1 P H

CLOCK B 2 P H

TEST 3 1 P H

TEST 3 2 P H

SPEED SEL 1 P H

SPEED SEL 2 P H

1 The signal names ending with L are active low; the signal names ending with H are active high.

A–8 Pin Specifications for the Ports on the BA42-B System

Pin Specifications for the Ports on the BA42-B System

Table A–4 Pin Specifications for the External SCSI Connector
Contact

Signal Name 1

Contact

Signal Name 1

GROUND

TERMPWR

DB (0) L

RESERVED

GROUND

RESERVED

DB (1) L

GROUND

DB (2) L

GROUND

ATN L

DB (3) L

GROUND

DB (4) L

GROUND

BSY L

DB (5) L

GROUND

ACK L

DB (6) L

GROUND

RST L

DB (7) L

GROUND

MSG L

DB (P) L

GROUND

SEL L

GROUND

C/D L

GROUND

RESERVED

REQ L

RESERVED

GROUND

OPEN

I/O L

1 The signal names ending with L are active low; the signal names ending with H are active high.

Pin Specifications for the Ports on the BA42-B System A–9

B
Recommended Spare Parts List
Table B–1 gives a list of the recommended spare parts for the MicroVAX 3100
Model 40 and Model 80 systems that use the BA42-B enclosure.
Table B–1 Recommended Spare Parts
Description1

Part Number

Quantity

CPU module, KA45-AA (SOC)

54-20654-01

CPU module, KA47-AA (Mariah)

54-20652-01

CPU module, KA50-AA (NVAX)

54-21797-01

Cable assembly, SCSI A internal loop

17-02943-01

SCSI cable clamp

90-11237-01

Cable assembly, SCSI A/B, CPU to I/O

17-02944-01

Terminator, 50-way SCSI (H8574-A)

12-30552-01

Loopback connector, standard Ethernet

12-22196-01

T-connector, ThinWire Ethernet (H8223)

12-25869-01

Terminator, ThinWire Ethernet, 50-ohm (H8225)

12-26318-01

Loopback connector, modem port, 25-way

29-24795-00

Adapter, 25-way EIA-232 to 6-way MMJ

H8575-A

Memory module, MS44-AA (4M bytes)

54-19103-AA

Memory module, MS44L-AA (4M bytes)

MS44L-AA

Memory module, MS44-CA (16M bytes)

54-19103-CA

Power supply unit (H7829-AA)

30-35042-01

17-02219-01

Cable assembly, dc harness, upper shelf

1 The major FRUs are the entries in this column that are not indented.

instructions on how to replace these FRUs.

This manual gives

(continued on next page)

Recommended Spare Parts List B–1

Recommended Spare Parts List

Table B–1 (Cont.) Recommended Spare Parts
Description1

Part Number

Quantity

Cable assembly, dc harness, lower shelf

17-03018-01

Cable assembly, 3.3 V dc harness

17-03136-01

RX26-AA

Cable assembly, RX26 to SCSI/FDI board

17-00285-00

RX26 SCSI/FDI board

54-20764-02

RZ23L disk drive

RZ23L-E

RZ24 disk drive

RZ24-E

RZ25 disk drive

RZ25-E

RZ26 disk drive

RZ26-E

RZ35 disk drive

RZ35-E

TZ30 tape drive

TZ30-AX

74-34273-01

TZK10 tape drive

TZK10-AA

TLZ06 tape drive

TLZ06-AA

RRD42 CD-ROM drive

RRD42-AA

Asynchronous option, DHW42 logic board

54-20662-01

RX26 diskette drive

TZ30 take-up leader

Asynchronous option, DHW42 input/output cable

17-02942-01

Asynchronous option, DHW42 input/output module
(8-data only lines)

70-28542-02

Asynchronous option, DHW42 input/output module
(16-data only lines)

70-28542-03

Cable assembly, asynchronous, 36-way Champ to
harmonica

17-01174-01

System loopback connector (8- or 16-data only
lines)

H3101-00

Cable loopback connector (8- or 16-data only lines)

H3101-00

Harmonica, 8-line distribution

H3104-00

Loopback connector, MMJ (H3103)

12-25083-01

1 The major FRUs are the entries in this column that are not indented.

instructions on how to replace these FRUs.

This manual gives

(continued on next page)

B–2 Recommended Spare Parts List

Recommended Spare Parts List

Table B–1 (Cont.) Recommended Spare Parts
Description1

Part Number

Quantity

Asynchronous option, DHW42 input/output module (8
modem control lines)

70-28543-01

Cable assembly, async, 50-way uchamp to four
25-way D-sub (BC29J-06)

17-02941-01

System loopback connector (4 modem control lines,
H4081-A)

12-34212-01

Synchronous option, DSW42 logic board

54-20640-01

Synchronous option, input/output cable

17-02942-01

Synchronous option, input/output module (two lines)

70-28542-01

12-25852-01

System loopback connector (H3199-00)
Cable assembly, EIA-232/V.24 (BC19D-02)

17-01110-01

Cable assembly, EIA-423/V.10 (BC19E-02)

17-01111-01

Cable assembly, EIA-422/V.11 (BC19B-02)

17-01108-01

EIA-232/V.24 cable loopback connector

H3248-00

EIA-423/V.10 cable loopback connector (H3198-00)

12-26259-01

EIA-422/V.11 cable loopback connector (H3198-00)

12-26259-01

System power cord (USA)

17-00606-02

Terminal cable (BC16E-25)

17-00811-03

Antistatic kit

29-26246-00

1 The major FRUs are the entries in this column that are not indented.

instructions on how to replace these FRUs.

This manual gives

Recommended Spare Parts List B–3

Glossary
The glossary defines some of the important terms used in this manual.
ac
alternating current.
CD-ROM
Compact disc read-only memory.
CPU
Central processing unit. The main unit of a computer containing the circuits
that control the interpretation and execution of instructions. The CPU holds
the main storage, arithmetic unit, and special registers.
dc
direct current.
ESD
Electrostatic discharge.
Ethernet
A type of local area network (LAN) based on carrier sense multiple access with
collision detection (CSMA/DC).
FDI
Floppy diskette interface.
FRU
Field replaceable unit.
ground
A voltage reference in a system that has a zero voltage potential.

Glossary–1

jumper wire
A short length of wire used to complete a circuit temporarily or to bypass a
circuit.
LED
Light emitting diode.
MMJ
Modified modular jack.
module
A unit that contains electrical components and electrically conductive pathways
between components.
port
A physical connector.
rms
root mean square. The root mean square value of an alternating voltage is
the square root of the mean value of the square of the voltage values during a
complete cycle.
ROM
Read-only memory.
SCSI
Small computer system interface. An interface designed for connecting disks
and other peripheral devices to computer systems. SCSI is defined by an
American National Standards Institute (ANSI) standard.
standard Ethernet
An IEEE 802.3 compliant Ethernet network composed of standard Ethernet
cable as opposed to thin Ethernet cable.
system
A combination of system hardware, software, and peripheral devices that
performs specific processing operations.
ThinWire
A trademark used to describe Digital’s IEEE 802.3 compliant products used for
local distribution of data communication.

Glossary–2

Index
A
Accessory tray, 2–5
Air exhaust, 1–10
Air flow
typical value, 1–10
Air intake, 1–10
Altitude
nonoperating, 2–4
operating, 2–4
Asynchronous communications options
list of, 1–17
removing, 3–58
spare parts for, B–1

B
BA42-B system
installing, 2–7
pin specifications, A–1
Break/enable LED
function of, 1–5
location of, 1–3
Break/enable switch
function of, 1–5
location of, 1–3

Cables
disconnecting from the CPU, 3–64
CD-ROM drive
removing, 3–43
Communications devices
list, 1–16
Communications options
list of, 1–17
ports for, 1–3
Configuration
communications options, 1–16
mass storage devices, 1–20
Model 40 memory, 1–10
Model 80 memory, 1–12 to 1–14
Model 90 memory, 1–14 to 1–16
system, 1–10
Connectors
system unit, 1–3
Console terminal
communication parameters, 2–7
connecting, 2–7
Controls
system unit, 1–3
Cover
removing, 3–5
CPU module
removing, 3–63
replacing, 3–67

Cable clamp
releasing (Models 40 and 80 only), 3–53
Cable loopback connectors, B–1

Index–1

D
DHW42
removing, 3–58
DHW42 input/output cable
removing, 3–60
DHW42 input/output module
removing, 3–61
DHW42 logic board
removing, 3–59
Dimensions
BA42-B enclosure, 2–1
shipping container, 2–2
Disk drive
removing, 3–10
SCSI ID setting, 3–14
See RZ-series, 3–10, 3–14
Diskette drive
removing, 3–23
Drive-mounting shelves
function of, 1–20
removing, 3–48
DSW41
removing, 3–54
DSW42 input/output cable
removing, 3–56
DSW42 input/output module
removing, 3–57
DSW42 logic board
removing, 3–55

Ethernet ID ROM
location of, 3–67
orientation of, 3–67
Ethernet loopback connector
standard Ethernet, 2–12
Ethernet switch
function of, 1–5
location of, 1–3
Ethernet terminators
connecting, 2–10

F
FDI/SCSI board
removing, 3–25
Field replaceable unit
See FRU
Flying lead connector, 3–30
FRU
defined, 3–1
list, 3–3
locations, 3–3
section references, 3–3

H
Heat dissipation
typical value, 2–3
Humidity
nonoperating, 2–4
operating, 2–4
storage, 2–4

E
Electrical power
requirements, 2–5
Electrostatic discharge
See ESD, 2–3
Enclosure
description of, 1–1
removing cover, 3–5
ESD
effects of, 2–3
protection, 2–3

Index–2

I
ID ROM
removing, 3–65
Indicators
function of, 1–3
power OK, 1–3
system unit, 1–3
Input/output module
DHW42, removing, 3–61
DSW42, removing, 3–57

Interconnection diagram, A–1

J
Jumper wires
RRD42, 3–47
RZ23L, 3–15
RZ24, 3–16
RZ25, 3–17
RZ26, 3–18
RZ35, 3–19
TZK10, 3–37

K
KA45 CPU module
removing, 3–63
KA47 CPU module
removing, 3–63

Model 40
basic system memory, 1–10
Model 80
basic system memory, 1–12
Model 90
basic system memory, 1–14
Mounting bracket
RRD42, 3–46
RX26, 3–26
RZ25, 3–13
TLZ06, 3–41
TZ30, 3–31
TZK10, 3–36
MS44-AA memory module
removing, 3–6
MS44-CA memory module
removing, 3–6
MS44L-AA memory module
removing, 3–6

LED display, 1–6
Logic board
DHW42, removing, 3–59
DSW42, removing, 3–55
Loopback connectors
for system ports, B–1
standard Ethernet, 2–12

Nonoperating conditions, 2–4

M
Mass storage devices
combinations, 1–20
list, 1–20
orientation, 1–20
Memory
expansion increments, 1–10, 1–12, 1–14
model 40 basic, 1–10
model 80 basic, 1–12
model 90 basic, 1–14
modules, 1–10, 1–12, 1–14, 3–6
Memory expansion connectors
identification of, 1–10, 1–12, 1–14

O
On/Off switch
function of, 1–5
location of, 1–3
Operating conditions, 2–4
Option switches
TLZ06, 3–42

P
Pin specifications, A–1
Ports
asynchronous, 1–3
function of, 1–3
identifying, 1–3
location of, 1–3
MMJ, 1–3
SCSI, 1–3
synchronous, 1–3

Index–3

Power cord
connecting, 2–13
Power distribution, 1–8 to 1–9
Power OK indicator, 1–3
Power requirements, 2–5
Power supply unit
dc current outputs, 1–7
flying lead connector, 3–30
output power, 1–7
removing, 3–70
specifications, 1–7
Power-on indicator, 1–3

R
Recommended spare parts
list of, B–1
RRD42 CD-ROM drive
mounting bracket, 3–46
removing, 3–43
SCSI ID setting, 3–47
RX26 diskette drive
mounting bracket, 3–26
removing, 3–23
RX26 FDI/SCSI board
removing, 3–25
SCSI ID setting, 3–27
RZ-series disk drive
removing, 3–10
SCSI ID setting, 3–14
RZ23L disk drive
removing, 3–10, 3–21
SCSI ID setting, 3–14
RZ24 disk drive
removing, 3–10, 3–21
SCSI ID setting, 3–14
RZ24L disk drive
removing, 3–10
RZ25 disk drive
removing, 3–10, 3–21
SCSI ID setting, 3–14
RZ26 disk drive
removing, 3–10
SCSI ID setting, 3–14

Index–4

RZ35 disk drive
removing, 3–10
SCSI ID setting, 3–14

S
SCSI cable
releasing (Model 90 only), 3–53
removing, 3–51
SCSI ID
RRD42 jumper wire locations, 3–47
RX26 switch locations, 3–27, 3–28
RZ23L jumper wire locations, 3–15
RZ24 jumper wire locations, 3–16
RZ25 jumper wire locations, 3–17
RZ26 jumper wire locations, 3–18
RZ35 jumper wire locations, 3–19
setting on RZ-series disk drives, 3–14
TLZ06 SCSI ID and option switches
location, 3–42
TZ30 switch locations, 3–32
TZK10 jumper wire locations, 3–37
SCSI ID switches
TLZ06, 3–42
Signal distribution, 1–9
Site preparation, 2–1
Space requirements, 2–7
Spare parts
list of, B–1
Standard Ethernet
loopback connector, 2–12
Static electricity
See ESD, 2–3
Storage conditions, 2–4
Support plate
separating, 3–11
Synchronous communications options
list of, 1–16
removing, 3–54
spare parts for, B–1
System configuration
guidelines for, 1–10
System loopback connectors, B–1

System unit
air exhaust, 1–10
air intake, 1–10
clearance, 2–7
connectors, 1–3, 2–7
controls, 1–3
dimensions, 2–1
indicators, 1–3
ports, 1–3, 2–7
spare parts for, B–1
turning on, 2–14

T
Tape drive
TLZ06, removing, 3–38
TZ30, removing, 3–29
TZK10, removing, 3–33
Temperature
nonoperating, 2–4
operating, 2–4

storage, 2–4
Terminator
ThinWire Ethernet, 2–10
TLZ06 tape drive
mounting bracket, 3–41
option switches, 3–42
removing, 3–38
SCSI ID setting, 3–42
TZ30 tape drive
mounting bracket, 3–31
removing, 3–29
SCSI ID setting, 3–32
TZK10 tape drive
mounting bracket, 3–36
removing, 3–33
SCSI ID setting, 3–37

U
Upper drive-mounting shelf
removing, 3–19

Index–5