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EK-RMSBA-CG-001

May 1992

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Document:	Rack-Mountable VAX 4000 Storage Backplane Assy Conversion Guide
Order Number:	EK-RMSBA-CG
Revision:	001
Pages:	18
Original Filename:

OCR Text

Rack-Mountable VAX 4000
Storage Backplane Assembly
Conversion Guide
Order Number EK-RMSBA-CG

Digital Equipment Corporation
Maynard, Massachusetts

May 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.

DEC, DECUS, DSSI, MicroVAX, PDP, Q–bus, TK, VAX, and the DIGITAL logo
are trademarks of Digital Equipment Corporation.

This document was prepared using VAX DOCUMENT, Version 2.0.

Contents
Preface

Chapter 1 Removal and Installation
1.1
1.2
1.3

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
Removing the Storage Backplane Assembly . . . . . . . . . . . . . . . . . . 1–3
Replacing the Storage Backplane Assembly . . . . . . . . . . . . . . . . . . 1–7

Figures
1–1
1–2
1–3
1–4
1–5

Rev A01 and Rev B01 Storage Backplane Assemblies . . . . 1–2
Removing the ISE Devices . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
Rev A01 Storage Backplane Assembly Showing DSSI, SCSI
and Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Extending the SCSI Cable . . . . . . . . . . . . . . . . . . . . . . . . . 1–8
Rev B01 Storage Backplane Assembly . . . . . . . . . . . . . . . 1–10

iii

Preface

This guide describes how to replace a Rev A01 or Rev B01 storage
backplane assembly with a Rev B01 storage backplane assembly in a
Rack-Mountable VAX 4000 system.

Intended Audience
This document is intended for Digital Services personnel and licensed
self-maintenance customers.

Customer Responsibilities
Customers should not install the storage backplane assembly unless they
are qualified self-maintenance customers. Only qualified maintenance
personnel should perform the installation procedure. If you are not a
qualified self-maintenance customer, call Digital Services to schedule a
system conversion.
It is the customer’s responsibility to perform a software backup before a
Digital Services representative arrives at your site.

Digital Services Responsibilities
The Digital Services representative should contact the customer to ensure that the customer’s software is backed up before arriving at the
site.

Organization
This document contains one chapter, which describes the removal and
replacement procedure.
The following conventions are used in this guide:
Convention

Meaning

CAUTION

Provides information to prevent damage to equipment or
software.

NOTE

Provides general information about the current topic.

Related Documents
Refer to the Rack-Mountable VAX 4000 Model 500/600 Installation
/Operator’s Manual as necessary.

Chapter 1
Removal and Installation
1.1 Introduction
This chapter describes the procedure to remove and install a storage
backplane assembly (P/N 70-28602-02) in the Rack-Mountable VAX 4000
system. This removal and installation procedure replaces a Rev A01 or
Rev B01 storage backplane with a Rev B01 storage backplane.
The Rev A01 storage backplane has four (4) power connectors; the Rev
B01 storage backplane has three (3) power connectors. Either storage
backplane can be used in Rack-Mountable VAX 4000 Models 300, 400
and 500. Only the Rev B01 storage backplane is replaceable in the Model
600. Figure 1–1 shows the Rev A01 and Rev B01 storage backplanes. A
minimum of three power connector assemblies are required for all models
of the Rack-Mountable VAX 4000 system.

Removal and Installation 1–1

Figure 1–1: Rev A01 and Rev B01 Storage Backplane Assemblies

1–2 Removal and Installation

1.2 Removing the Storage Backplane Assembly
Perform the steps in the following procedure to remove the storage
backplane assembly from the chassis:
1. Turn the main ON/OFF power switch to OFF and disconnect the
power cord from the wall receptacle.
2. Release the two captive fasteners on each side of the chassis that
secure the chassis to the cabinet rails.
3. Remove two 10-32 x 1/2 inch screws from the top of the chassis bezel.
4. Remove two 10-32 x 1/2 inch screws from the bottom of the chassis
bezel.
5. Remove the chassis bezel.
6. Loosen the captive 6-32 x 3/8 inch screw securing each of the integrated storage equipment (ISE) bezels (some may be blank bezel
covers).
NOTE
Be sure to note the bus identification number of each
ISE before removing the cover. Each ISE device must
be installed in its correct slot.

7. Remove the ISE bezels (see Figure 1–2).
8. Disconnect the cable from the bezel.
9. Loosen the two captive screws that secure the ISE device to the
chassis.
10. Remove all ISE devices and set aside on a clear work surface.
11. If a TK70 tape drive is installed, slide the device part way out; reach
in through the top of the chassis and remove the control cable by
pressing the two connector locking tabs. Move the cable to the rear.
12. Slide the TK70 tape drive out and set it aside on a clear work
surface.

Removal and Installation 1–3

Figure 1–2: Removing the ISE Devices

CAUTION
When removing the DSSI and SCSI cables from the
backplane assembly, label the cables and connectors
to ensure their correct replacement.

13. Remove the DSSI cable (P/N 17-02502-02) and SCSI cable (P/N 1702542-02) from the storage backplane (see Figure 1–3).
CAUTION
When removing the storage backplane assembly, be
sure that the all connector extractors will not be interfering with the side of the chassis as the assembly
is removed from the chassis.

1–4 Removal and Installation

14. Remove the DSSI cable (P/N 17-02954-01) and SCSI cable (17-0295402) from the storage backplane.
15. Unplug the four power card connectors (or three power card connectors if you are removing a Rev B01 storage backplane) from the
storage backplane. Pull the cables down and away from the storage
backplane. See Figure 1–3.
16. If you removed a Rev A01 storage backplane, fold back and tie the
power cable disconnected from the left-most power connector with tie
wrap, and lay on bottom of the chassis. This power cable is not used.
NOTE
Ensure the the power cable lies flat so as not to
obstruct the path of the ISEs when they are returned
to the chassis.

Removal and Installation 1–5

Figure 1–3: Rev A01 Storage Backplane Assembly Showing DSSI, SCSI
and Power Connections

1–6 Removal and Installation

17. Pull the chassis out to the lock position.
18. Remove the metal plug button from the side of the storage backplane
assembly (see Figure 1–5).
19. Remove the two 6-32 x 3/8 inch screws from the storage backplane
assembly cover panel (see Figure 1–5).
20. Slide the storage backplane assembly out through the opening in the
chassis to your right (see Figure 1–5).

1.3 Replacing the Storage Backplane Assembly
To replace the storage backplane assembly, perform the following steps:
1. If you removed a Rev B01 storage backplane, proceed to step 2. If you
removed a Rev A01 storage backplane, you must extend the length
of the SCSI cable from the SCSI connector in so that it reaches the
left-most connector on the Rev B01 storage backplane. Extend the
length of the SCSI cable as follows:
a. Remove the two module covers and modules (if installed) to the
right of the SCSI connector in to gain access to the SCSI cable.
CAUTION
Static electricity can damage modules and electronic components. Digital recommends using a
grounded antistatic wrist strap and a grounded
work surface when handling any modules.

b. Reach into the opening where you removed the modules, and
gently push the SCSI cable toward the front of the unit (see
Figure 1–4). Reach into the empty ISE slot from the front of the
unit, and gently pull the SCSI cable to the left of the assembly, so
that it will reach the left-most SCSI connector when the storage
backplane is replaced.

Removal and Installation 1–7

Figure 1–4: Extending the SCSI Cable

Replace the modules and covers to the right of the SCSI connector
in.

2. Remove the continuity card (P/N 50-21156-01) from the left-most
connector on the Rev B01 storage backplane assembly.
CAUTION
When installing the storage backplane assembly, be
sure that the assembly is properly aligned to the
rails. Also, ensure that all connector extractors

1–8 Removal and Installation

(shown in Figure 1–5) are not interfering with the
side of the chassis as the assembly is pushed in place.

3. Slide the backplane assembly to your left through the opening on the
right of the chassis (see Figure 1–5).
4. Replace the two 6-32x3/8 inch screws to the storage backplane
assembly cover panel (see Figure 1–5).
5. Replace the metal plug button on the side of the assembly (see
Figure 1–5).
6. Connect the three remaining power cables to the power connections
on the storage backplane assembly.
7. Replace the DSSI cable (P/N 17-02954-01) and SCSI cable (P/N 1702954-02) on the storage backplane.
8. Return continuity card to left-most connector on storage backplane
assembly.
CAUTION
The continuity card must be properly installed so
that the storage backplane functions properly.

Removal and Installation 1–9

Figure 1–5: Rev B01 Storage Backplane Assembly

1–10 Removal and Installation

9. Connect the DSSI cable (P/N 17-02502-02) and SCSI cable (P/N 1702542-02) to the storage backplane assembly.
10. Replace TK70 tape drive if one was removed.
11. Replace all ISE devices.
12. Replace the two captive screws that secure each ISE device to the
chassis.
13. Replace the ISE bezels.
14. Tighten the captive 6-32 x 3/8 inch screw securing each ISE bezel
(some may be blank bezel covers).
15. Replace the chassis bezel.
16. Replace the two 10-32 x 1/2 inch screws on the bottom of the chassis
bezel.
17. Replace the two 10-32 x 1/2 inch screws on the top of the chassis
bezel.
18. Return the VAX 4000 to the cabinet.
19. Replace the two captive fasteners on each side of the chassis that
secure the chassis to the cabinet rails.
20. Plug in the power cord into the ac power source and turn the main
ON/OFF power switch to ON.

Removal and Installation 1–11