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EK-186AA-MG-1

October 1988

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Document:	BA23 Enclosure Maintenance
Order Number:	EK-186AA-MG
Revision:	1
Pages:	114
Original Filename:	micropdp11-volume_2_enclosures-EK-186AA-MG-001.pdf

OCR Text

•

BA23 Enclosure Maintenance
Order Number EK-186AA-MG-001

digital equipment corporation
maynard, massachusetts

....

October 1988
The information in this document is subject to change without notice and should not be
construed as a commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that may appear in
this document.
The software. if any,
described in this document is furnished under a license and may
be used
•
•
or copied only in accordance with the terms of such license. 1'\0 responsibility is assumed
for the use or reliability of software or equipment that is not supplied by Digital Equipment
Corporation or its affiliated companies.
•

:t' Digital Equipment Corporation. 1988. All rights reserved.
Printed in C.S.A.
The READER'S COM:\IE~TS form on the last page of this document requests the user's
critical eyaluation to assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation:
DEC
DECmate
DECnet
DECUS
DECwriter
DEL1'\I
DEQ:\"A
DESTA
DIBOL
:\IASSBCS
:\1 icroPDP-ll

:\1 icro VA",>(
MicroVl\IS
PDP
P·OS
Professional
Q-bus
Rainbow
RSTS
RSX
RT
ThinWire

ULTRIX
U~IBCS

VAX
VAXBI
VAXEL1'\
VAXcluster
VAXstation
VMS
VT
Work Processor

digital

:\1L-S973

FCC NOTICE: The equipment described in this manual generates. uses, and may emit
radio frequency energy. The equipment has been type tested and found to comply with the
limits for a Class A computing device pursuant to Subpart ,J of Part 1.'i of FCC Rules. which
are designed to provide reasonable protection against such radio frequency interference when
operated in a commercial environment. Operation of this equipment in a residential area
may cause interference, in which case the user at his own expense may be required to take
measures to correct the interference.

•

Contents
Preface
Chapter 1

•

BA23 Enclosure Description

1.1
1.2
1.3
1.4
1.4.1
1.4.2
1.5
1.6

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
:Ylass Storage Device Areas ..........................
Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Backplane Assembly ...............................
Signal Distribution Panel. . . . . . . . . . . . . . . . . . . . . . . . ..
Backplane. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
I/O Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

1-1
1-2
1-3
1-8
1-8
1-10
1-13
1-16

1.7

Fans......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

1-18

1.8
Configuration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . ..
1.8.1
:v1odule Order and Configuration . . . . . . . . . . . . . . . . . . ..
Configuration Worksheet • • • • • • • • • • • •
1.8.2
•
• • • •
•

1-19
1-20
1-20

Preparing the Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1
·
.
D ImenSlons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1
Additional Equipment ........................... .
2.1.2
Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3
Operating Environment .......................... .
2.1.4
Static Electricitv ............................... .
2.1.5
"
Heat Dissipation ............................... .
2.1.6
Temperature and Humidity Ranges ................. .
2.1. 7
Electrical Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.8
Unpacking the Shipment ........................... .
2.2
Installing the BA23 Pedestal ........................ .
2.3

2-1
2-1
2-3
2-3
2-3
2-3
2-4
2-4
2-4
2-5
2-6

•

Chapter 2

•

Installation

•••

III

•
2.3.1
Air Flow Considerations ......................... "
2.3.2
Installing the Console Terminal. . . . . . . . . . . . . . . . . . . ..
2.3.3
Connecting the Console Terminal to the System ... . .. "
2.3.4
Connecting External Devices . . . . . . . . . . . . . . . . . . . . . ..
Connecting to a Network . . . . . . . . . . . . . . . . . . . . . . . . ..
2.3.5
2.3.6
Setting Controls on the System . . . . . . . . . . . . . . . . . . . ..
2.3.6.1
Boot Select (MicroPDP-11/53 only) ................
2.3.6.2
Setting the Baud Rate (MicroPDP-11) ............ "
2.3.6.3
Setting Controls on the CPU I/O Insert (Micro VAX) '"
2.3.6.4
Checking the Voltage Setting. . . . . . . . . . . . . . . . . . . ..
2.3.7
Checking the Circuit Breaker ......................
2.3.8
Completing the Installation . . . . . . . . . . . . . . . . . . . . . . ..
2.4
Installing the BA23 Tabletop Version. . . . . . . . . . . . . . . . . ..
2.5
Installing the BA23 Rack Mount Version. . . . . . . . . . . . . . ..

Chapter 3
3.1
3.2
3.3
3.4
3.4.1
3.4.2
3.4.3
3.5
3.6
3.7
3.8
3.9
3.10

•

2-7
2-7
2-7
2-9
2-10
2-11
2-12
2-12
2-14
2-15
2-16
2-16
2-17
2-20

FRU Removal and Replacement

FRUs • •
• •
• • • • •
• • • • • • • •
• •
Modules.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Mass Storage Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
RX- and TK-Series Drives . . . . . . . . . . . . . . . . . . . . . . . ..
RD-Series Fixed-Disk Drives . . . . . . . . . . . . . . . . . . . . . ..
Interconnect Cables for Mass Storage Devices ......... .
CPU I/O Insert ................................... .
Backplane Assembly ...............................
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Rear Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Front Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
MicroVAX Battery Backup Unit (BBU) ... . . . . . . . . . . . . ..
•

•

3-1
3-4
3-7
3-9
3-9
3-12
3-14
3-16
3-18
3-23
3-28
3-30
3-32

•

Appendix A

BA23 System Interconnection Pinouts

Appendix B

Related Documentation

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

BA23 Enclosure, Pedestal Version (MicroVAX). . . . . . . . . . . .
1-1
BA23 Mass Storage Locations . . . . . . . . . . . . . . . . . . . . . . . .
1-2
BA23 4-Button Control Panel and PC Board (Example) ....
1-3
BA23 6-Button Control Panel and PC Board (Example) ....
1-4
BA23 Signal Distribution Panel. . . . . . . . . . . . . . . . . . . . . ..
1-8
BA23 Internal Cabling (Example) . . . . . . . . . . . . . . . . . . . .. 1-10
BA23 Backplane Grant Continuity .................... 1-11
H9278 Backplane Termination Resistors . . . . . . . . . . . . . . .. 1-13
BA23 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-14
H7864 Power Supply <Rear View) ..................... 1-16
BA23 I/O Panel .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-17
BA23 110 Inserts and Adapter Plate ................... 1-18
BA23 Front Fan Baffle and Louvered Frame. . . . . . . . . . . .. 1-19
BA23 Configuration Worksheet ... . . . . . . . . . . . . . . . . . . .. 1-24
BA23 Enclosure Dimensions .........................
2-2
Shipping Carton Contents . . . . . . . . . . . . . . . . . . . . . . . . . ..
2-6
Removing the Rear Cover ...........................
2-8
Connecting the Console Terminal (Example) . . . . . . . . . . . ..
2-9
Connecting External Devices . . . . . . . . . . . . . . . . . . . . . . . .. 2-10
Connecting an Ethernet Cable . . . . . . . . . . . . . . . . . . . . . . .. 2-11
Boot Select Switch (MicroPDP-11/53 only). . . . . . . . . . . . . .. 2-12
Setting the Baud Rate (MicroPDP-11) . . . . . . . . . . . . . . . . .. 2-13
CPU I/O Insert Controls (Micro VAX) . . . . . . . . . . . . . . . . . .. 2-14
Checking or Changing the Voltage Setting. . . . . . . . . . . . . .. 2-15
Checking the Circuit Breaker ........................ 2-16
Attaching the Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-17

2-13
2-14
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
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

•

Preparing the Tabletop Configuration ................ "
Removing the Base Screws ..........................
Completing the Tabletop Configuration ............... "
BA23 Rack Mount Version ......................... "
BA23-AR Rack Mount Kit Contents ...................
Preparing the Brackets ........................... "
:v1ounting the Brackets ............................ "
Preparing the Rack .............................. "
:v1ounting the Left Rail .............................
Attaching the Stop Plate and Brackets .................
Attaching the Stop Cable .......................... "
Preparing the Front Cover ......................... "
Attaching the Front Cover ......................... "
BA23 Enclosure FRU s ............................ "
Removing :\1odules ............................... "
Releasing the Ejector Levers ....................... "
Accessing the Control Panel ........................ "
Accessing the Diskette or Tape Drive ................. "
Removing a Disk Drive (Example) ................... "
RD-Series Jumper Clip (Example) . . . . . . . . . . . . . . . . . . . ..
Removing the Access Door ......................... "
Removing the CPU 1/0 Insert ...................... "
Removing the Retaining Bracket and Covers ........... "
Accessing the Backplane .......................... "
Removing the Backplane Screws .................... "
Removing the BackpJane .......................... "
Power Supply Cables ............................. "
Removing the Power Supply .........................
Fan Housing Connection . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Rear Fan Cable Position ............................
Removing the Rear Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Installing the Rear Fan ........................... "
Accessing the Front Fan ............................

2-18
2-19
2-20
2-21
2-22
2-23
2-24
2-25
2-26
2-27
2-28
2-29
2-29
3-3
3-5
3-6
3-8
3-11
3-13
3-14
3-15
3-17
3-19
3-21
3-22
3-23
3-25
3-26
3-27
3-28
3-29
3-30
3-31

•
3-21
3-22
3-23
A-I

Removing the Front Fan
3-32
•
• • • • • • • •
•
Disconnecting the Battery Backup Unit ................ . 3-33
Removing the Battery Backup Unit. . . . . . . . . . . . . . . . . . .. 3-34
BA23 System Interconnection Pinouts. . . . . . . . . . . . . . . . .. A-2
•

•

Tables
1-1
1-2
1-3
1-4

1-5
1-6
1-7
1-8

1-9
2-1
2-2
2-3
3-1

BA23 Control Panel
•
• • • • • • • • •
BA23 Control Panel PC Board Components ............. .
BA23 Control Panel PC Board Jumpers ................ .
BA23 Signal Distribution Panel Connectors ............. .
BA23 Backplane Connectors ........................ .
H7864 Power Supply Specifications ................... .
BA23 Power Supply Front Connectors ................. .
BA23 Cutout and Insert Sizes ....................... .
Power, Bus Load, and 110 Insert Data ................. .
Temperature Ranges, Humidity Ranges, and Altitude Limits
240 V Power Cords. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
BA23 Electrical Requirements ....................... .
BA23 FRU s ..................................... .
•

•

1-5
1-7
1-7

1-9
1-12
1-15
1-16
1-17
1-21
2-4

2-5
2-5
3-2

••

VII

•

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Preface
This guide provides reference, installation, and maintenance information
on the BA23 enclosure. This enclosure is intended for MicroPDP-ll and
MicroVAX systems.

Intended Audience
This document is intended only for DIGITAL Field Service personnel and
qualified self-maintenance customers.

Organization
This document has three chapters and two appendixes.
Chapter 1 provides an overview of the system enclosure, describing controls,
mass storage area and capacity, backplane, signal distribution, power
distribution, VO connections, and configuration guidelines.
Chapter 2 lists site preparation considerations, and shows how to install
the pedestal, tabletop, and rack mount versions.
--

Chapter 3 describes how to remove and replace field replaceable units
(FRUs). The beginning of the chapter contains a list of these FRUs.
Appendix A shows the system interconnection pinouts.
Appendix B contains a list of related documentation.

Warnings, Cautions, and Notes
Warnings, cautions, and notes appear throughout this guide. They have
the following meanings:
WARNING

Provides information to prevent personal injury.

CACTION

Provides information to prevent damage to equipment or software.

KOTE

Provides general information about the current topic.

•

....

•

Chapter 1

BA23 Enclosure Description
1.1 Introduction
This chapter describes the BA23 enclosure, which is used in pedestal,
tabletop, and rack mount installations.
Figure 1-1 shows the pedestal version.
Figure 1-1:

BA23 Enclosure, Pedestal Version (MicroVAX)

MLO--OOO 194

BA23 Enclosure Description

1-1

1.2

Storage Device Areas

The BA23 can hold full-height and half-height 13.3-cm (5.25-in) mass
storage devices, depending on the system.

Figure 1-2 shows the two locations, A and B, that the enclosure has for
these devices.
You can install one RD50-series fixed-disk drive and one removable-media
drive an RX50 diskette drive or a TK50 tape drive. You cannot install two
full-height, fixed-disk drives due to power limitations.
Some systems support half-height devices. In these systems, you can install
one or two RD30-series fixed-disk drives and one or two RX33 diskette
drives.
You can connect external drives to the system's I/O distribution panel. The
number of drives you can use depends on the space available in the I/O
panel and backplane, and the amount of power available to run the drive
controllers.
Figure 1-2:

BA23 Mass Storage Locations

B
A

MlO-OOO 195

1-2

BA23 Enclosure Maintenance

•
1.3 Control Panel
The BA23 has either a 4- or 6-button control panel as follows:
•

Systems with a 4-button control panel support only full-height mass
storage devices (Figure 1-3),

•

Systems with a 6-button control panel support either full-height or halfheight devices (Figure 1-4),

Figure 1-3:

BA23 4-Button Control Panel and PC Board (Example)

TEST POINTS

o W3
o

~SWITCHl

SWITCH 2--,

o
+5V +12V

I
I

Fixed Disk 0

Write Protect

Halt

I
I

I 0
o W2
I 0

Ready

Restart

Run

Micro
VAX II

I
DC OK I
Wl

I
I
I

POWER
ON/OFF
SWITCH

I
I

L __ _

--20·PIN
CONNECTOR
ON PC
BOARD
MLO-OOO196

BA23 Enclosure Description

1-3

Figure 1-4:

BA23 6-Button Control Panel and PC Board (Example)

TEST POINTS

o
o W3
o

SWITCH 2

-5 V

I
I

Fixed Disk 1
Write Protect

Fixed Disk a
Write Protect

Halt

Run

I
I

W2 ___

SWITCH 1

Micro

PDP-11/XX

Ready

Restart

DC OK

o
o
o
Wl

POWER
ON/OFF
SWITCH

I
I

L __ _
20-PIN
CONNECTOR
ON PC
BOARD

1-4

BA23 Enclosure Maintenance

MLQ-OOO'97

- ...

Table 1-1 describes the functions of the controls and indicators on both the
4- and 6-button control panels.

Table 1-1:
Control

BA23 Control Panel
Setting

Description
Rocker switch with orange LED indicator.

On/Off
1

System ac power is on.

LED on

System ac power is off.

LED off
Green LED indicator.

DC OK
On

All dc voltages are present and within tolerance.

Off

All dc voltages not present or within tolerance.
Green LED indicator.

Run

•

III

The CPU
tionl.

run

mode

Off

The CPU is in console mode.

normal operating condi-

Pushbutton switch with red LED indicator.

Out
LED off

Puts the CPU in program I/O mode (normal position for running user software I.
Pushing the Halt
switch tlrice lin, then out again I puts the system in console mode, where the system accepts only console commands.

In
LED on

Stops the system. Commands cannot be entered when the
button is in.
~lomentary-contact

Restart-

pushbutton switch. When you press
IRestart I. the system simulates a power-down/power-up sequence in order to restart CPU operation. You can enable or disable the Restart switch, using a switch on the control panel printed circuit board.

Fixed Disk 0
Wri te Protect

Pushbutton switch with •vellow LED indicator for the fullheight. fixed-disk drive. or the first half-height. fixeddisk drive.

1 You

can disable the Halt switch by setting the halt enable switch on the CPt.: I/O insert to the disable position I dot outside of circle i. In this case, pressing IHaltl turns on the orange indicator but does not halt the system.
2you can disable the Restart switch by setting the restart enable switch on the control panel printed circuit board to the disable position.

BA23 Enclosure Description

1-5

Table 1-1 (Cont.):
Control

BA23 Control Panel

Setting

Description

Out
LED ofT

Allows the system to read from and write to the disk (normal operating position).

In
LED on

Prevents the system from writing to the disk.
lows the system to read from the disk.

Ready•

Still al-

Pushbutton switch with green LED indicator for the fullheight, fixed-disk drive, or the first half-height, fixeddisk drive.
Out
LED on

Puts the disk on-line (normal operating position I. The system can read from and write to the fixed disk.

In
LED ofT

Takes the disk ofT-line. The svstem
cannot read from and
•
write to the fixed disk.

Fixed Disk 1
Write Protect

Pushbutton switch with yellow LED indicator for a second half-height, fixed-disk drive. Only on the 6-button control panel.
Out
LED ofT

Allows the system to read from and write to the disk (normal operating position I.

In
LED on

Prevents the system from writing to the disk.
lows the system to read from the disk.

Ready

Still al-

Pushbutton switch with green LED indicator for a second half-height, fixed-disk drive. Only on the 6-button control panel.
Out
LED on

Puts the disk on-line (normal operating position I. The system can read from and write to the fixed disk.

In
LED ofT

Takes the disk ofT-line. The system
cannot read from and
•
write to the fixed disk.

The controls and indicators for the 4- and 6-button control panel are on a
printed circuit board, shown in Figures 1-3 and 1-4. Table 1-2 describes
functions of the printed circuit board components. Table 1-3 describes the
jumper settings.

1-6

BA23 Enclosure Maintenance

•
Table 1-2: BA23 Control Panel PC Board Components
Component

Function

Switch 1

Enables the Q22-bus BEVENT timing signal and allows the line time clock to operate under software control.

Switch 2

Enables the Restart switch on the control panel.

20-pin J 1 connector

Connects the backplane assembly cable.

WI, W2, W3
.
Jumpers

Table 1-3 lists the jumpers and pin connections.

+5 V and +12 V
test points

Serve as system test points.

Table 1-3: BA23 Control Panel PC Board Jumpers
Jumper

Pin Connection

Condition

Top and center
(factory position 1

Enables RD drive O. t;sed when RD drive 0 is present.

Bottom and center

Disables RD drive O. Used to prevent Ready light
from turning on when RD 0 is not present.

Top and center
(factory position 1

Enables RD drive 1.
present or not.

Bottom and center

Disables RD drive 1. Not used. l

Top and center

Disables restart logic in BA23-C (bottom enclosure.1 in an H9642 cabinet.

Bottom and center

Enables restart logic in BA23-A I top enclosure 1 in
an H9642 cabinet.. and in the standalone BA23 svstern.

Used whether RD drive 1 is

lThe W2 bottom and center setting is not used because RD drive 1 has no Ready light to disable.

BA23 Enclosure Description

1-7

1.4 Backplane Assembly
The backplane assembly for the BA23 has three major parts:
•

Signal distribution panel (for mass storage devices)

•

Sheet-metal mounting bracket

•

Backplane (H927S)

1.4.1 Signal Distribution Panel
The signal distribution panel carries signals from an RQDX2 or RQDX3
controller module in the Q22-bus backplane to the mass storage devices.
This panel (Figure 1-5) is the front side of the backplane assembly.
Figure 1-5:

BA23 Signal Distribution Panel

. . . . . . . . . . . ..

•
•
•

J';:iXEJJIS><"

j2=IX::DD s-<..c

J6;"E\"C'.'ABL:'DSK1+:;:

II dddddddli
. . . .. . .
......... ..

~5FIX::C::J-SK'

Iddddl
. . . . . .. . .. . .. .

•
•
•
••
•
•
•
•
•
•
•
•
•
•
•
•

....... "'

r---------------:

•
•
•
•
•

••
••
n

,•

L _ J'

~-------------.

'~ _ J

•

J4CONTROLPANEL
POWER SUPPLY
J2 (NOT LASE LED)
MLO-OOO 198

1-8

BA23 Enclosure Maintenance

•

•
Table 1-4 lists the six connectors on the signal distribution panel and their
functions.

Table 1-4:

BA23 Signal Distribution Panel Connectors

Connector

Function

J6 Removable Disk 1. 2

Provides signals to an RX50 diskette drive. An RX50 contains two disk units.
If the system also has a fixeddisk drive. the RO:'v1 code usually
• labels the RX50 drives as disk
unit 1 IDCAl! and disk unit 2 (DCA2.!.
•

J7 Fixed Disk O.
J2 Fixed Disk 0

Provide signals to the first fixed-disk drive in port 0 lIeft side I.
The ROM code usuallv
labels this drive as disk unit 0 (DCAO!.
•

Jl Fixed Disk 1.
J5 Fixed Disk 1

Provide signals to a second fixed-disk drive. The BA23 supports this configuration only with half-height drives. The RO~1
code usually labels this drive as disk unit 1 IDU1 i.

J4 I Control Panel!

Provides signals to the control panel printed circuit board.

Jl.J2. J3. J4

These connectors are not part of the signal
tion panel. They are on the backplane assembly.

distribu-

J7.JlO

These connectors are not part of the
tion panel. They are on the power supply.

distribu-

signal

See Appendix A for the names of signals used by the signal distribution
panel. Figure 1-6 shows an example of the connections between the signal
distribution panel and the other components in a BA23.
TK50 tape drives do not connect to the signal distribution panel. A TK50
connects to its own controller via a TK50-to-M7546 interconnect cable, part
of a TQK50 controller kit.

BA23 Enclosure Description

1-9

Figure 1-6:

BA23 Internal Cabling (Example)

POWER
SUPPLY

FANS
BACKPLANE
SIGNAL
DISTR I BUTION
PANEL

RD
DRIVES

RX
DR IVES

FRONT
CONTROL
PANEL
MlO-OOO199

1.4.2 Backplane
The backplane (H9278) uses the extended LSI-ll bus. The LSI-ll bus is
usually called the Q22-bus, because it uses 22-bit addressing. For more
information on the Q22-bus, see the CPU maintenance documentation.
The backplane has eight slots for modules compatible with the Q22-bus.
Four rows (A, B, C, and DJ run across each slot. Figure 1-7 shows the
grant continuity for the backplane.
A dual-height module has connectors that fit into two rows of a backplane
slot. Two dual-height modules can occupy one backplane slot.

1-10

BA23 Enclosure Maintenance

A quad-height module has connectors that fit into all four rows of a
backplane slot. One quad-height module occupies one backplane slot.
Figure 1-7:

BA23 Backplane Grant Continuity

MlO-QOO200

The CD rows of slots 1, 2, and 3 are interconnected. This feature is called
the private memory interconnect (PM!). To determine CPU and memory
slots, see the appropriate CPU maintenance documentation.
If you install a dual-height module in the AB or CD rows of slots 4 through

8, you usually have to install another dual-height module or an M9047
grant card in the other two rows of the slot. The exception is the last
dual-height module installed on the grant continuity chain. For example, a
dual-height module installed in the AB rows of slot 6 does not need a grant
card in the CD rows, if it is the last module in the system.
Table 1-5 lists the four connectors on the front (signal distribution panel)
side of the backplane and their functions.

BA23 Enclosure Description

1-11

•
Table 1-5: BA23 Backplane Connectors
Connector

Function

Used to connect the power supply backplane
ries the dc power and signals from the power supply.

Provides signals from an installed CPU module to the control panel PC
board.

J3 and J4

Provide the termination point for the mass storage power cable if the system does not use mass storage devices.

cable.

which

car-

See Appendix A for the names of signals on these connectors.
The backplane supports up to 30 ac loads and 20 dc loads. An ae load is
the amount of capacitance a module presents to a bus signal line. One ac
load equals 9.35 picofarads (pD. A de load is the amount of dc leakage
a module presents to a bus signal line. One dc load is approximately 105
microamperes (JIA). The backplane presents seven ac loads and no dc loads.
The H9278 backplane also includes termination resistors, on the bottom of
the unit (Figure 1-8). You may have to remove these resistors if you connect
the H9278 to another backplane without using the M9404 and M9405-4B
backplane interconnect modules.

1-12

BA23 Enclosure Maintenance

Figure 1-8:

H9278 Backplane Termination Resistors

TOP

BOTIOM

TERMINATION
RESISTORS

MlO-OOO201

BA23 Enclosure Description

1-13

•
1.5 Power Supply
Figure 1-9 shows the power supply for the BA23 enclosure. There are three
variations of the power supply, depending on the enclosure model number:
H7864, H7864A, or H7864B.
Figure 1-9:

BA23 Power Supply
POWER SUPPLY

MU}-{IOO202

The power supply regulators maintain proper output voltages against
temporary fluctuations in the ac input to the power supply.
The power supply is a 230-watt (W) unit. It supplies +5 Vdc at 4.5 amps (A)
to 36.0 A, and +12 Vdc at 0.0 A to 7.0 A to the following system components:
Backplane
Fixed-disk drive
Diskette drive or tape drive
The power supply also sends three system control signals to the backplane,
asserting two of these signals (BDCOK Hand BPOK H) when the system
power is stable. The third signal (BEVENT L) is an external line clock
interrupt request to the CPU. The LTC switch on the control panel PC
board enables the BEVENT L signal.
The power supply also has two +10 Vdc at 0.45 A fan outputs for the front
and rear dc fans. You can increase the fan voltages to +12 Vdc by changing
a power supply jumper. However, the KA630 CPU module's thermal and
acoustical specifications are based on the +10 volt setting. The required fan
power does not affect the 230 W output. Table 1-6 lists the power supply
specifications.

1-14

BA23 Enclosure Maintenance

•
Table 1-6: H7864 Power Supply Specifications
Parameter

Specification

+5 Vdc Output
Voltage
Current

4.5 A minimum
36.0 A maximum

Overcurrent

37 A minimum (averaged over 1 msec; must not trip)
42 A maximum (averaged over 1 msec; must trip)

Ripple and noise
+12 Vdc Output
Voltage

+12.1 Vdc +/-2.5%

Current

o A minimum
7.0 A maximum

Normal
overcurrent

7.2 A minimum (averaged over 1 msec; must not trip)
8.0 A maximum (averaged over 1 msec; must trip)

Startup
overcurrent

9.0 A for 10 sec minimum (must not trip)
10.0 A for 5 sec minimum (must not trip)
11.5 A for 1 sec minimum (must not trip)
13.0 A for 500 Ilsec (must trip)

Ripple and noise

75 mV peak-to-peak maximum

The following controls and connectors are on the rear of the power supply
(Figure 1-10):
•

Remote power control connector

•

lEC (International Electrical Commission)
compatible with international power cables

•

Circuit breaker to protect the input power line

•

Voltage select (VOLT SEL) switch with two settings

input connector,

120 V = 88 to 128 Vac
240 V = 176 to 256 Vac

BA23 Enclosure Description

1-15

Figure 1-10:

H7864 Power Supply (Rear View)

CIRCUIT
BREAKER

VOLTAGE
SELECT
SWITCH
AC
INPUT

o
I I I

o
REMOTE
POWER
CONNECTOR
IVIlO--OOO203

The power cable for the rear fan is part of the H7864 power supply.
The front of the power supply has four connectors that provide the functions
listed in Table 1-7.

Table 1-7: BA23 Power Supply Front Connectors
Connector

Function

Provides the power for the front control panel.

Provides the signals for the mass storage power cable. This cable has two termination points on the backplane: J3 (if you do not have a removable media drive I.. or J4 (if -vou do not have an RD50-series fixed disk I.

Provides the power for the backplane.
nates at J 1 of the backplane.

JlO

Provides power to the fans.

The backplane power cable termi-

1.6 I/O Panel
You use the I/O panel to connect external devices to the system. Each device
connects to a module in the system through a filtered connector. You mount
the connector on an insert, then install the insert in a cutout on the 1/0
panel. Filtered connectors and inserts are part of the option's cabinet kit.

1-16

BA23 Enclosure Maintenance

•
Figure 1-11 shows the I/O panel. Usually, the CPU insert is installed in the
top (or left) cutout. The I/O panel has six cutouts in two sizes, types A and
B. Table 1-8 lists the size of the cutouts and the corresponding inserts.
----

Figure 1-11:

BA23 I/O Panel

CPU CUTOUT

MLO--OOO204

Table 1-8: BA23 Cutout and Insert Sizes
Type

Quantity

Inches

Millimeters

Cutout

0.6 x 3.2

15 x 81

Insert

1.0 x 4.0

25 x 102

Cutout

2.25 x 3.2

57 x 81

Insert

2.5 x 3.3

64 x 84

You can install three more type A inserts by removing the bracket between
the third and fourth cutouts and installing an adapter plate. Figure 1-12
shows the adapter plate with typical type A and B inserts.

BA23 Enclosure Description

1-17

Figure 1-12:

BA23 1/0 Inserts and Adapter Plate
--

TYPE B
INSERT

--ADAPTER
PLATE

TYPE A
INSERT

MlO--OOO205

1.7 Fans
The BA23 enclosure contains two fans:
•

A front fan, behind the control panel

•

A rear fan, above the power supply

These fans draw air from the base of the BA23 enclosure and out through
the top of the enclosure.

1-18

BA23 Enclosure Maintenance

The BA23 enclosure models illustrated in this document contain a fan baffle
over the front fan, and airflow louvers on the bottom and top of the frame
(Figure 1-13). Other models do not contain the fan baffle or airflow louvers.
The optimum configuration for the BA23 enclosure is:
•

A front fan assembly that does not contain a fan baffle

•

A frame without airflow louvers

Figure 1-13:

BA23 Front Fan Baffle and Louvered Frame
FAN BAFFLE

-B
A

AIRFLOW
LOUVERS
MLO-OOO206

1.8 Configuration Guidelines
Before you change a system's configuration, consider the following factors:
Module order in the backplane
Module configuration
Mass storage device configuration

•

If you are adding a device to a system, confirm the capacity of the system

enclosure in these areas:
Backplane
I/O panel
Power supply
Mass storage devices

BA23 Enclosure Description

1-19

•

1.8.1 Module Order and Configuration
The order of modules in the backplane depends on four factors:
•

•

Relative use of devices in the system

•

Expected performance of each device relative to other devices

•

Ability of a device to tolerate delays between bus requests and bus
grants (delay tolerance)

•

Tendency of a device to prevent devices farther from the CPU from
accessing the bus

The relative use and performance of devices depends on the application.
This means the order of modules also depends on the application. Most
applications try to balance the use of devices. For balanced applications, use
the recommended module order listed in the appropriate CPU maintenance
documentation. Make sure you read the rules and guidelines discussed in
the CPU documentation; they affect the recommended order.
When devices do not perform as expected, you can change the recommended
order of modules to meet the needs of the application. Performance
problems often involve a device that is heavily used or has a low delay
tolerance. Usually, there are other heavily used devices between the
problem device and the CPU. In this case, move the problem device closer
to the CPU.
NOTE: If the option has Q / CD jumpers, check the options documentation
for the correct Q / CD jumper configurations.
An incorrect jumper
configuration can cause damage.
For information on how to configure modules, refer to Microsystems Options.

•

1.8.2 Configuration Worksheet
Use the configuration worksheet (Figure 1-14) to make sure a configuration
does not exceed a system's limits for expansion space, 1/0 space, power, and
bus loads. If you use standard DIGITAL modules, you will not exceed the
limits for bus loads. Use the configuration worksheet as follows:
1.

On the worksheet, list all the devices already installed in the system.

List all the devices you plan to install in the system.

Fill in the information for each device, using the data listed in
Table 1-9.

1-20

BA23 Enclosure Maintenance

•
4.

Add up the columns. Make sure the totals are within the limits for the
enclosure.

NOTE: Check the appropriate CPU documentation to determine which
options are supported.

Table 1-9:

Power, Bus Load, and liD Insert Data
Current
(Amps)

Power

Bus Loads

Option

Module

+5 V

+12 V

Watts

AAV11-D2

A1009

1.S

0.0

9.0

1.0

ADV11-D2

A100S

3.2

CXA16-~I

~i311S-YA

16.0
10.4

1.0
3.0

1.0
0.5

CXBl6-:\1

:\1311S-YB

1.6
2.0

0.0
0.2
0.0

:\13119-YA

1.64

3.0
3.2

0.5

CXYOS-~I

10.0
12.94

DEQKA

:\17504

23.5

2.S

DELQA
DFA01

~17516

3.5
2.7

0.5
0.5

19.5
14.7

2.2
3.0

0.5
1.0

DHV11
DLVEI-DP

~13121-PA

0.395
0.5
0.5

Insert l

:\13104

1.97
4.5

0.40
0.55

29.1

2.9

0.5

B 12 I

:\IS0 17

1.0

1.5

23.0

1.6

1.0

0.25

21.6
21.6

2.0
2.0

1.0
1.0
1.0

B
A
B

I\1S053-:\IA

0.4
0.3S
0.3S

1.0
2.0

D~IV11-BP

3.4
3.4
3.4

S.O
21.S

D:\IVll-AP

:\IS043
:\IS053
I\1S053-1\1A

1.0

D:\IV11-CP

1\1S064-:\IA

3.35

0.26

19.9

2.0

1.0

D~IVll-FP

1\1S053-~1A

3.4

0.3S

21.6

2.0

1.0

B
A 121

D:\IVll-K
DPV11

I\1S064

3.4

I\1S020
1\17941

1.2
0.9

0.4
0.3

21.S
9.6

2.0
1.0

1.0
1.0

:\17950

0.0
0.0

4.5
9.5
10.7

2.S
3.3
3.0

1.0
1.0

9.0

2.0

1.0
1.0

1.5

1.0

3.9

1.0

2.0

1.0

DLVJ1
D~IVll-1\1

DRV11
DRVll-BP
DCV11-DP

~17951

1.9
1.2

DRVll-J

~IS049

1.S

DZQll
DZVll

:vI3106
:\17957

1.0
1.2

0.36
0.39

9.32
10.7

IEQll

:\IS634

3.0

0.0

15.0

0.39
0.0

A
A
A (21
A (21
A (21
A (21

lA = 2.5 em x 10.0 cm (1 in x 4 inl.
B = 5.0 em x 7.5 em 12 in x 3 in I.
2Usually connected through a universal data input panel (CDIP I. using a 13.l3-cm 15.25in 1 mass storage slot.

BA23 Enclosure Description

1-21

•
Table 1-9 (Cont.): Power, Bus Load, and 1/0 Insert Data
CUl'rent
(Amps)

Power

Bus Loads

Option

Module

+5 V

+12 V

Watts

KA620-AA
KA630-AA
KA650-AA
KDA50-Q3
KDA50-Q

M7478
M7606
M7620-A
M7164
M7165 4
Cor D rev

6.2
6.2
6.0
6.93
6.57

0.14
0.14
0.14
0.0
0.03

32.7
32.7
31.7
34.65
33.21

2.7
2.7
2.7
3.0

1.0
1.0
1.0
0.5

KDA50-Q

~171654

4.07

0.03

20.71

5.5
5.5
5.5
3.0
2.6
2.2
0.8
1.6
2.8
5.3
1.0
1.8
1.8
3.1
2.7
3.74
4.1
3.45
3.6
2.4

0.1
0.1
0.2
0.0

28.7
28.7
29.9
15.0
15.4
11.2
4.0
8.0
14.0
26.5
5.0
9.0
9.0
15.5
13.5
18.7
20.5
17.25
17.5
12.0

2.3
2.3
2.6
2.3
3.0
1.0
1.4
3.0
1.8
0.0
0.0
0.0
0.0
0.0
0.0
2.7
2.7
2.0
2.0
2.0

1.1

KDF11-BE
KDJ11-BC
KDJ11-BF
KLES1
KMV11
KWV11-C 2

E rev
M8189
M8190
M8190
M7740
M7500
M4002

LPV11
MRV11-D5

M8027

MRV11-D
M9060-YA
MS630-AA

M7942

MS630-BA

MS630-BB
MS630-CA
:\IS650-AA
MSVll-JD
MSV11-JE
MSVll-PK
MSV11-PL
MSVll-QA

~17942

M7607
M7608
M7608
:\17609
M7621-A
M8637-D
M8637-E

M8067-K
M8067-L
M7551-AA

0.2
0.013
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

1.1

1.0
1.0
1.0
1.0
1.0
0.5
1.0
0.0
0.0
0.0
0.0
0.0
0.0
0.5
0.5
1.0
1.0
1.0

Insert l

B
B
A
B
A

1 A = 2.5 em x 10.0 em il in x 4 in.l.

B = 5.0 em x 7.5 em (2 in x 3 in).
2Usually connected through a universal data input panel (UDIP), using a 13.13-em (5.25in) mass storage slot.
3KDA50-Q is a two-module set IM7164/M7165).
AC and DC bus loads listed = total for both modules.
4The etch revision letter C, D, or E is part ofthe module part number near the handle. For example, a part number xxxxx-Ex-xx is a revision E module.
5Unpopulated module.

1-22

BA23 Enclosure Maintenance

•
Table 1-9 (Cont.):

Power, Bus Load, and I/O Insert Data
CUl'rent
(Amps)

Option

RA70
RC25
RD31
RD32
RD33
RD51
RD52
RD53
RD54
RD54A-EA
RLV12-AP
RQDX1
RQDX2
RQDX3
RQDXE
RX33
RX50
TK50
TK50-AA
TK50E-EA
TK70E-EA
TQK25-KA
TQK50
TSV05
VCB01
VCB02
VCB02

Module

M8061
M8639-YA
M8639-YB
M7555
M7513

M7605
M7546
M7196
M7602
M7169
M7168

Power

Bus Loads
AC

+5V

+12V

Watts

3.3
1.0
0.9
0.9
0.9
1.0
1.0
0.9
1.3
1.3
5.0
6.4
6.4
2.48
0.5
0.5
0.85
1.35
1.35
1.35
1.5
4.0
2.9
6.5
4.6
5.8
3.4

2.9
2.5
0.9
0.6
1.0
1.6
2.5
2.5
1.34
1.34
0.10
0.25
0.1
0.06
0.0
0.3
1.8
2.4
2.4
2.4
2.4

51.3

0.0
0.0
1.5
0.75
0.0

35.0
38.8
33.0
15.7
24.2
35.0
34.5
23.7
22.6
26.2
35.0
33.2
13.2
2.5
5.6
25.9
33.55
34.5
35.6
36.3
20.0
14.5
32.5
42.0
38.0
17.0

Insert l

2.7
2.0
2.0
1.0
1.0

1.0
1.0
1.0
1.0
0.0

2.0
2.8
3.0
3.0
3.5
0.0

1.0
0.5
1.0
1.0
1.0
0.0

A
A
B
B

lA = 2.5 em x 10.0 em (1 in x 4 in).
B = 5.0 em x 7.5 em (2 in x 3 in).

BA23 Enclosure Description

1-23

Figure 1-14:

BA23 Configuration Worksheet
ADD THESE COLUMNS

BACKPLANE
SLOT

MODULE

•

(

CURRENT (AI
+5

+12 V

I/O I NSE RTS

POWER
(WI

230

1 AB
CD
2 AB
CD
3 AB
CD
4 AB
CD
5 AB
CD
6 AB
CD
7 AB
CD
8 AB
CD
MASS
STORAGE
1
2

COLUMN
TOTALS:
MUST NOT
EXCEED:

36.0

7.0

'IF MORE THAN TWO TYPE A CONNECTORS ARE REQUIRED,
AN ADAPTER TEMPLATE (PN 74·27740-011 MAY BE USED. THIS
ALLOWS THREE ADDITIONAL TYPE A CONNECTORS BUT REDUCES
THE AVAI LABLE TYPE B CUTOUTS TO TWO.
MLO-OOO207

1-24

BA23 Enclosure Maintenance

Chapter 2

Installation
This chapter provides site preparation guidelines and installation
procedures for the BA23 enclosure, including the pedestal, tabletop, and
rack mount versions.

2.1 Preparing the Site
Before you unpack the BA23 enclosure shipment, verify the physical,
environmental, and electrical requirements in this section.

2.1.1 Dimensions
Figure 2-1 shows the dimensions of the BA23 enclosure. The figure also
shows the dimensions of the shipping container.
WARNING: Use two people to handle the shipping container and the

enclosure. The shipping container and enclosure together weigh about 46.5
kg (J02 lb). The pedestal weighs 31. 7 kg (70 lb); the tabletop weighs 29.5 kg
(65 lb).

Installation

2-1

•
Figure 2-1:

BA23 Enclosure Dimensions

71.2 em ____
_ _ (28 in)

107.31 em
(42.25 in)

54.6 em
(21.5 in)

44.4 em
(17.5 in)

15.2 em
(6 in I

46.5 kg (102 Ib)

72.6 em
(28.6 in )

72.6 em
(28.6 in)

17.7 em
(7 in)

TABLETOP
•
29.5 kg 165 Ib)

64.2 em
124.5 in)

56.2 em
122.13 in)

PEDESTAL
31.75 kg (70 Ib)

25.4 em
110in)

TABLETOP
CONVERSION
....0-000208

2-2

BA23 Enclosure Maintenance

•
2.1.2 Additional Equipment
Make sure there is sufficient space for terminals and other peripheral
equipment. The temperature and humidity at which mass storage media
are kept should be the same as that of the computer area.
When you plan the cable routing for multiple-terminal systems, consider
factors such as safety, convenience, future expansion, and cost. You should
have cabling in place and labeled before you install the system.

2.1.3 Acoustics
1
The BA23 system operating acoustic emission levels are as follows :

LNPE (B)2 = 6.1
LPA (dB)3 = 48

2.1.4 Operating Environment
Computer systems located in office areas are subject to discharge of static
electricity, temperature changes, and humidity.
You should install the system in a well-ventilated area where the
temperature and humidity ranges listed in Section 2.1. 7 are maintained
throughout the year. Rapid temperature changes may affect system
performance. Therefore, systems should not be operated near heating or
cooling devices, large windows, or doors that open to the outside. Air should
contain a minimum of dust and other abrasive contaminants.

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

Maintain relative humidity of at least 407c.

•

Place the system away from busy office corridors.

•

Avoid using carpeting in the computer area, if possible. If carpeting
is to be installed, antistatic carpeting is recommended. If carpeting is
already in place, place an antistatic mat under the system.

Data measured in accordance with ANSI S12.1O-1985 and ISOIDIS 7779. Levels may be
lower, depending on the kind and number of mass storage devices in the system.
2 LNPE = Noise power emission level (A-weighted sound power level) measured in bels re 1
pw.
3 LPA = Sound pressure measured in decibels at 1.0 m from the front edge of the unit and
1.5 m above the floor.
1

Installation

2-3

2.1.6 Heat Dissipation
Heat dissipates in the BA23 enclosure system at the rate of 1177.4 Btu per
hour.

2.1.7 Temperature and Humidity Ranges
Table 2-1 shows the temperature ranges, humidity ranges, and altitude
limits for systems in the BA23 enclosure.

Table 2-1: Temperature Ranges, Humidity Ranges, and Altitude Limits
Parameter

Range

Temperature

Operating: 1

lO'C to 4WC
5WF to 104'F

~ onoperating:

-40'C to 60'C
-40'F to 140'F

Temperature rate of change

Operating:

11 'C per hour maximum
19.8'F per hour maximum

Relative humidity
•

Operating:

20 C'c to 80'1 (noncondensing I

Nonoperating:

10'1 to 95'1

Operating:

2440 m (8000 ft I

~onoperating:

4900 m 116,000 ft )

Maximum altitude

1 For operation above sea level, decrease the operating temperature by 1.8'C per 1000 m

lor

1'F per 1000 ftl.

2.1.8 Electrical Requirements
The power source should be adequate to handle the original system and
allow for system expansion. DIGITAL recommends a dedicated circuit from
the power source to each system. Additional power equipment may be
required to avoid power disturbances.
Table 2-2 lists power cord information for 240 V operation of systems in
the BA23 enclosure. Table 2-3 lists electrical requirements for systems in
the BA23 enclosure.

2-4

BA23 Enclosure Maintenance

•
Table 2-2:

240 V Power Cords

Power Cord Number

Countries

BN02A-2E

United Kingdom and Ireland

BN03A-2E

Austria, Belgium, Czechoslovakia, Finland, France,
Germany, Hungary, Netherlands, Norway, Poland, Portugal, Spain, and Sweden

BN04A-2E

Switzerland

BN05A-2E

Australia and ~ew Zealand

BN06A-2E

Denmark

BN07A-2E

Italv
,

Table 2-3:

BA23 Electrical Requirements

Nominal ac Voltage

100 Vac

120 Vac

220-240 Vac

Voltage range

90-110 Vac

104-128 Vac

191-256 Vac

Power source phase

Single

Nominal frequency

50-60 Hz

Frequency range

47-63 Hz

Maximum steady state
current at nominal voltage

5.3 A

4.4 A

2.2 A

:Vlaximum steady state
current at minimum voltage

5.5 A

2.7 A

:'I1aximum inrush current

100 A

:Vlaximum power consumption

345 W

2.2 Unpacking the Shipment
To unpack a BA23 enclosure system, follow the steps on the installation
sheet attached to the shipping container. Figure 2-2 shows the contents of
the shipping carton.

Installation

2-5

Figure 2-2:

Shipping Carton Contents
-.

TERMINAL CABLE

2 SCREWDRIVERS
SYSTEM UNIT
LABEL SHEETS

GRANT CONTINUITY
MODULE
PLUS FI LLER STRIP
REQUIRED FOR TABLETOP
INSTALLATION

POWER CABLE

MlD-000209

The shipment may include some of the following equipment:
Additional terminal(s)
Printer(s)
Modem(s)
Cables for connecting additional devices

2.3 Installing the BA23 Pedestal
Use the guidelines and procedures in the following sections to install the
BA23 enclosure pedestal version. Procedures for installing the tabletop
version are in Section 2.4. Procedures for installing the rack mount version
are in Section 2.5.

2-6

BA23 Enclosure Maintenance

2.3.1 Air Flow Considerations

The system requires 5 cm (2 in) of clearance for ventilation on each side.
Leave about 60 cm (2 ft) at the rear of the system to connect any cables,
and to access the controls behind the rear cover.
Mter unpacking the system, use two people to move the unit to the
determined location. The unit weighs 27 kg (60 lb).

2.3.2 Installing the Console Terminal
Unpack the terminal and documentation. The console terminal is packed
in several boxes containing the following:
Video monitor
Keyboard
Documentation, including an installation guide and owner's manual
System box (graphics terminals only)
Use the instructions in the terminal installation guide to connect the
components and perform the setup procedures.

2.3.3 Connecting the Console Terminal to the System
Connect the console terminal to the system as follows:
1.

Pull off the rear cover (Figure 2-3).

Installation

2-7

Figure 2-3:

Removing the Rear Cover

,
,I,

MLO--DOO21Q

Turn off the console terminal.

Connect the terminal cable to the Comm Port on the rear of the
terminal, according to the instructions in your terminal installation
guide.

Connect the other end of the cable to the CPU panel on the rear of the
system (Figure 2-4).

2-8

BA23 Enclosure Maintenance

•
Figure 2-4:

Connecting the Console Terminal (Example)

TO CONSOLE TERMINAL

.
f
/

- ,
,

•• .I-

•

\.
,

, "c -< < c• c -- - I

-- - - --

..-

- --

MlO-C0)211

2.3.4 Connecting External Devices
Before you connect devices to the system, test them according to the
documentation provided with the device, if possible.
WARNING: Turn off the devices before you connect them to the system.

You can connect up to eight terminals and/or printers for each DHQll and
DHVll module, and up to four for each DZQll module installed in the
system.

Installation

2-9

•

Connect the additional terminals and printers as shown in Figure 2-5.
Figure 2-5:

Connecting External Devices

ADDITIONAL
DEVICES
CABLE
GUIDE

MlO--OOO2 12

After making connections, thread all cables through the lower cable guide
(Figure 2-5).
You connect modem lines to the I/O panels the same way you connect
terminals and printers. The DHQll, DHVll, and DZQll modules have
modem control support.
Connect the other end of the cable to the modem, as described in the modem
installation guide. Make sure the modem is plugged into a power source
and connected to an active phone jack.

2.3.5 Connecting to a Network
You can connect the system to a network if the system contains a DELQA
or DEQNA option, and if the Ethernet cabling is in place. Use the following
procedure to connect to a network:
1.

Using the Ethernet cable shipped with the system, connect the male
end of the cable to an Ethernet connector on one of the type A inserts
(Figure 2-6). Slide up the locking device on the female connector to
secure the connection.

2-10

BA23 Enclosure Maintenance

Figure 2--6:

Connecting an Ethernet Cable

SLIDING
LOCK

MLO--OOO213

Connect the other end of the cable to one of the following devices:
•

An H4000 transceiver located on a traditional baseband Ethernet
cable.

•

A DELNI, which can, in turn, be connected to a baseband Ethernet
cable or which can connect up to eight systems in a local area
network (LAN).

•

A DESTA converter, if you need to connect to a ThinWire network.

2.3.6 Setting Controls on the System
Controls on the system are in four locations:
•

The CPU VO insert on the rear of the system

•

The voltage switch on the rear of the system

•

The circuit breaker on the rear of the system

•

The control panel on the front of the system

Installation

2-11

2.3.6.1 Boot Select (MicroPDP-11153 only)
The boot select switch is on the CPU I/O insert (Figure 2-7). This 16position rotary switch controls power-on and the language used by the
system. The system is factory-positioned to autoboot from disks and tapes
and to use English text. If you need to change the factory position, refer
to the CPU maintenance documentation for a description of the switch
settings.
Figure 2-7:

Boot Select Switch (MicroPDP-11153 only)

MicroPDP· 11/53

Baud Rale
0-300
1 - 600
2 - 1200
3·2400
4 - 4800
5·9600
6 - 19200
7·38400

W
AO
(3

@
(3

BOOT SELECT
SWITCH

MLO--DOO214

2.3.6.2 Setting the Baud Rate (MicroPDP-11)
The baud rate select switch(es) for the system is on the CPU I/O insert
(Figure 2-8).

The factory position is 9600; confirm this setting. To change the baud rate
setting, use a screwdriver to rotate the baud rate select switch(es). The
system and the terminal must be set to the same baud rate.

2-12

BA23 Enclosure Maintenance

Figure 2-8:

Setting the Baud Rate (MicroPDP-11)

MicroPDP-ll/53
MODIFIED
MODULAR
JACK

MicroPDP- 11/83, MicroPDP- 11 n3
LED
DISPLAY

LED
DISPLAY

-w

Baud Rate

-'r\,J~CDI.O(()

WOl~.$:>oCOC'l(l),b.

0-300
, -600
2 - '200
3 - 2400
4 - 4800
5 - 9600
6 - '9200
7 - 38400

BAUD RATE
SELECT SWITCHES

CONSOLE
TE RMINAL
CONNECTOR

00000000
00000000
, ,

,
I

BOOT SELECT
SWITCH

RATE
SELECT SWITCH

M,croPDP-ll/23
BAUD RATE
SE LECT SWITCH

CONSOLE
TERMINAL
CONNECTOR

MLO-OOO215

Installation

2-13

2.3.6.3 Setting Controls on the CPU 1/0 Insert (MicroVAX)
The following controls are located on the CPU I/O insert (Figure 2-9):
Figure 2-9:

CPU 1/0 Insert Controls (MicroVAX)

HALT
ENABLEDISABLE
SWITCH

POWER-UP
MODE
SWITCH

BAUD
RATE
SWITCH

I
,

00
,

EJ""'~
I

CONSOLE
TERMINAL
CONNECTOR

LED
DISPLAY

MlO-OOO216

•

Halt enable/disable switch. The factory position is halt disable (left),
indicated by the dot outside the circle. Leave the switch set to disable
while you start the system for the first time and run diagnostic software
to test the system. Before you install system software, move the switch
to halt enable (right).

•

Power-up mode switch. This 3-position rotary switch determines how
the system powers up. The factory position is run mode, indicated by
an arrow. Before you power up your system the first time, move the
switch to the language inquiry mode, indicated by a human profile.

•

Baud rate. The factory position is 9600; confirm this setting. If
necessary, rotate the baud rate switch to 9600. The system and the
console terminal must be set to the same baud rate.

2-14

BA23 Enclosure Maintenance

•
2.3.6.4 Checking the Voltage Setting
CAUTION: Be careful to set the voltage correctly. An incorrect voltage setting

can damage the system.
Peel back the label covering the switch to see the voltage setting
(Figure 2-10). If necessary, change the switch setting to match the voltage
source.
Figure 2-10:

Checking or Changing the Voltage Setting

115 V
IN NORTH AMERICA,
THE SWITCH IS SET
TOl15V.
VOLTAGE SWITCH

READ AND
REMOVE
CAUTlO\
LABEL

-------------------------220 V 1230 V 1240 V
IN OTHER COUNTRIES.
THE SWITCH IS SET TO
230 V IF NOT, LOOSEN
SCREWS, AND SLIDE
SWITCH TO 230 V.
SCREWS

MlO--OOO21 7

Installation

2-15

2.3.7 Checking the Circuit Breaker
Because the circuit breaker sometimes trips during shipment, confirm the
position of the circuit breaker (Figure 2-11).
Figure 2-11:

Checking the Circuit Breaker

CI RCU IT
BREAKER

MlO--OOO21 B

Press in on the circuit breaker to make sure it is in the proper position.
When the circuit breaker has tripped, it sticks out and can be pushed back
into position.

2.3.8 Completing the Installation
Complete the installation as follows:
1.

Make sure the system on/off switch is set to off (0), and that all devices
connected to the system are turned off.

Find the power cable packed inside the system shipping carton.

Make sure the pronged end of the power cable plug matches the wall
outlet.

Connect the opposite end of the power cable to the system (Figure 2-12).

Plug the pronged end of the power cable into a wall outlet.

2-16

BA23 Enclosure Maintenance

Attach the BA23 rear cover, making sure all cables are threaded
through the guide at the bottom of the enclosure. Push the rear cover
into place.

The installation of the BA23 enclosure is now complete. Refer to the
CPU maintenance documentation for procedures on running power-up
self-tests.

Figure 2-12:

Attaching the Power Cord

I
I,
,

MLO-OOO219

2.4 Installing the BA23 Tabletop Version
Use the following procedure to convert the BA23 pedestal to the tabletop
verSIOn:
•

Remove the front and rear covers (Figure 2-13).

Install four rubber feet on the right side of the system (Figure 2-13).

Remove the four screws at the base of the system (Figure 2-14).

Installation

2-17

Figure 2-13:

Preparing the Tabletop Configuration

MLO-OOO220

2-18

BA23 Enclosure Maintenance
,

...

Figure 2-14:

Removing the Base Screws

,I
I

MLO-OOO221

Follow the air circulation guidelines for the BA23 pedestal version in
Section 2.3.1. Lift the system from the foot stand and place it on a table.
WARNING: Use two people to move the system. The system weighs 29.5

kg (65 lb).
5.

Snap the filler strip (part no. 74-285010-01) onto the frame at the rear
of the enclosure. The filler strip covers the space between the enclosure
frame and the back cover (Figure 2-15).

Replace the front and rear covers (Figure 2-15).

Installation

2-19

I
Figure 2-15:

Completing the Tabletop Configuration
SNAP ON FILLER STR IP HERE

MLO-OOO222

To complete the tabletop installation, use the same procedures as in the
BA23 pedestal version, Sections 2.3.2 through 2.3.8.

2.5 Installing the BA23 Rack Mount Version
Use the procedures in this section to install a BA23 rack mount version
(Figure 2-16) into a standard cabinet/rack with the following dimensions:
•

48.2 cm (19 in) wide

•

63.5 cm (25 in) between vertical rails

2-20

BA23 Enclosure Maintenance

•
Figure 2-16:

BA23 Rack Mount Version

CUSTOMERSUPPLIED
RACK

MlO--DOO223

WARNING: Use two people to install the rack mount system. The system

weighs 29.5 kg (65Ib).
1.

Check the contents of the rack mounting kit against the parts shown
in Figure 2-17. If any item is missing or damaged, call the sales
representative.

Installation

2-21

Figure 2-17:

BA23-AR Rack Mount Kit Contents

.
0'

RAILS IRIGHT, LEFTI
LEFT - 7428371 - 02
RIGHT - 7428371 - 01

11 EACH)

FRONT COVER

III

~
::"!--

•

•
•

•

I
<:;,

•

RIGHT REAR BRACKET
7428372 - 02

11 I

LEFT REAR BRACKET
7428372 - 01

III

STOP PLATE
7428710 - 01

III

RIGHT FRONT BRACKET
7021543- 01

III

LEFT FRONT BRACKET
7430071 - 01

11 I

•

o •

•

o
o
o

NYLON STOP CABLE 11)

--- PHILLIPS MACHINE SCREWS

PHILLIPS SCREW WITH
LOCK WASHER

(13)

(8)

o @j WASHERS

(21

PHILLIPS SELF-TAP SCREWS (21

141

LOCKING HEX NUT

""" WITH LOCK WASHERS
FLAT HEAD PHILLIPS
MACHINE SCREWS

111

FASTENERS

~U NUTS

(ll

( 12)
MlO 000224

2-22

BA23 Enclosure Maintenance

...

Slide the U nuts into place on the right and left rear brackets
(Figure 2-18).

Figure 2-18:

Preparing the Brackets
SLIDE U NUTS
INTO PLACE

I I

,,
I

MLO-OOO225

Mount the left and right rear brackets onto the rails (Figure 2-19). Use
four Phillips machine screws with lock washers.

Installation

2-23

•
Figure 2-19:

Mounting the Brackets
RIGHT REAR
BRACKET

NOTE
POSITION
LARGER HOLE
TOWARD THE
BOTTOM
RIGHT REAR
RAIL

FINGER
TIGHTEN
SCREWS

;., FINGER
TIGHTEN
SCREWS

LEFT REAR
BRACKET

LEFT REAR RAIL
MlO-OOO226

2-24

BA23 Enclosure Maintenance

•
4.

Slide the U nuts into place on the rack (Figure 2-20).

Figure 2-20:

Preparing the Rack
SLIDE U NUTS

o
o

()
LEFT REAR RACK

LEFT FRONT RACK
MLO-OOO227

•

Installation

2-25

Mount the left rail (Figure 2-21). Use eight Phillips machine screws
with lock washers.

Figure 2-21:

Mounting the Left Rail

'! i

j' !

LEFT REAR
RAIL

I)
I)

,
,

LEFT FRONT
",--r- RACK

LEFT REAR RACK

POSITION PREPARED RAI L
AND TIGHTEN ALL SCREWS

Repeat steps 4 and 5 to mount the right rail.

Tighten all screws.

MlO--OOO228

Refer to Figure 2-22 for steps S through 11.
S.

Mount the fasteners on the left and right front brackets.
flathead Phillips machine screw for each bracket.

Use one

Attach the stop plate. Use two flathead Phillips machine screws.

10. Secure the left and right front brackets to the unit. Use two flathead
Phillips machine screws for each bracket.
11. Slide the system into the rack.
12. Attach the nylon stop cable (Figure 2-23).

2-26

BA23 Enclosure Maintenance

.....

•
Figure 2-22:

Attaching the Stop Plate and Brackets

STOP PLATE

ATTACH STOP PLATE

ATTACH FASTENERS
AND SECURE FRONT
BRACKETS TO THE

~_ _...::UNIT

· I
•
•

RIGHT FRONT
BRACKET

LEFT FRONT BRACKET AND FASTENERS

MLO-OOO229

Installation

2-27

Figure 2-23:

Attaching the Stop Cable
LEFT REAR RACK

NYLON STOP CABLE

SLIDE UNIT IN PLACE AND
SECU RE NYLON CABLE AS SHOWN

is;

MLO--OOO230

2-28

BA23 Enclosure Maintenance

13. Mount the self-tap screws on the front cover (Figure 2-24).
Figure 2-24:

Preparing the Front Cover

SELF-TAP SCREW(S)

MLO-OOO23,

14. Attach the front cover to the system (Figure 2-25 L
Figure 2-25:

Attaching the Front Cover

~--

----- ...,
_:r: ....

---

PRESS FIRMLY IN PLACE
MLO--OOO232

15. To complete the rack mount installation, use the same procedures as in
the BA23 pedestal version, Sections 2.3.2 through 2.3.8.

I nstaliation

2-29

....

Chapter 3

FRU Removal and Replacement
This chapter describes how to remove and replace the field replaceable units
(FRUs) in the BA23 enclosure. The procedures begin with units at the front
of the enclosure and proceed to those at the rear.
Each section describes the removal procedure for that FRU. Unless
otherwise specified, you can install an FRU by reversing the steps in the
removal procedure.

3.1 FRUs
Table 3-1 lists the BA23 FRUs and their part numbers.
Refer to
the applicable CPU documentation for CPU-specific part numbers and
supported options. All options are also FRUs. Refer to Microsystems
Options for option kit numbers.
Figure 3-1 shows the major FRUs as seen from the front of the enclosure.
CAUTION:

•

Only qualified service personnel should remove or install FRUs.

•

Before you remove or install FRUs, power down the system and remove
the ac power cord.

•

Static electricity can damage integrated circuits. Use the wrist strap
and antistatic mat found in the Antistatic Kit when working with the
internal parts of a computer system.

FRU Removal and Replacement

3-1

Table 3-1:

BA23 FRUs

FRU

Part Number

Power supplyl
H7864
H7864A
H7864B
AC power switch with cable to power supply

30-20444-00
30-21749-01
H7864B
70-20434-01

Adapter plate

74-28684-01

Backplane assembly
Backplane dc power cable

70-19986-00
17-01311-01

Battery pack for CPC I/O insert

12-19245-01

Control panel

70-22007-01
70-20451-1C
54-16744-01

Control panel cable
CPC I/O insert
DC fan I front or rear I
DC fan power cable
Front cover I floor/table I
Front cover Irackmount I
Grant card

12-17556-01
70-20449-00
74-27559-01
74-27561-01
:\19047

I/O panel
LED cable I 20-pin I

70-19979-00

Loopback connectors
MicroVAX memory
.' interconnect cable

12-15336-00
17-00716-01
74-27012-0

Pedestal I base I
Pedestal I enclosure!

17-00712-02

70-20469-01

Q22-bus backplane
RD50-series signal cable 120-wire I

H9278-A

RD50-series signal cable I 34-wire I

17-00286-00
70-22025-01

Rackmount kit
Rear coyer
RXIRD power cable
RX50 signal cable
Signal distribution panel
SLC cable I lO-pin)
TK50-to-TQK50 interconnect cable

17-00282-00

74-27560-01
17-01356-02
17-00285-02
54-15633-00
17 -00624-01
70-22313-01

lWhen you replace a power supply, make sure the new unit has the same part number as the old unit.

3-2

BA23 Enclosure Maintenance

•
Figure 3-1:

BA23 Enclosure FRUs

NOTES:
1.
CONNECTORS J1 AND J2 ARE LOCATED ON THE
BACKPLANE (H9278-A) ASSEMBLY.
2.
IF DISK DRIVE IS NOT PRESENT, THE POWER CABLE
CONNECTOR SHOULD BE PLUGGED INTO J3 ON THE
DISTR IBUTION PAN EL.
3.
IF DISK DRIVE IS NOT PRESENT, THE POWER CABLE
CONNECTOR SHOULD BE PLUGGED INTO J4 ON THE
DISTR IBUTION PANEL.
4.
THE REAR FAN CABLE IS AN INTEGRAL PART OF
THE H7864 POWER SUPPLY.
5.
THIS CABLE IS AN INTEGRAL PART OF THE
702069501 ASSEMBLY.

VIEW A-A
2 PLACES

REAR FAN
1217

POWER SUPPLY UN IT _S_E_E_N_n_T
3020444-00 0 R
3021749-01 OR
H7864B
BACKPLANE
BACKPLANE ASSEMBLY H9278-A
7019986-00
J4 SEE
NOTE 3

/17-01311-01

J3 SEE
NOTE 2

FRONT FAN
-1217556-01
170282-00
170286-00_

SEE

7020449-00

17-01356-02
SEE NOTE 3

--1700285-02

:---7020451-1 C
E NOTE 5

NOTE 2

RX OR TK
(RX50 SHOWN)

FRONT CONTROL
PANEL
7022007-01
MLO-QOO233

FRU Removal and Replacement

3-3

•
3.2 Modules
CAUTION:

•

Static electricity can damage integrated circuits. Use the wrist strap and
antistatic mat found in the Antistatic Kit when working with modules.

•

Remove and install modules carefully, to avoid damaging the modules
or changing switch settings.

•

New modules come wrapped in special antistatic packaging material,
with a silica gel packet to prevent damage from moisture. Use both
materials to protect any modules you store, transport, or return.

•

Dual-height modules: If you use dual-height Q22-bus modules in slots
2 or 3 of the BA23 backplane, you must install them in the AB rows. If
you do not install modules in these AB rows, you must install a grant
continuity card in row A. You can install dual-height memory modules
only in the CD rows of slots 2 and 3.

•

If you install a dual-height module in slots 4 through 8, you must install:
(J) a grant continuity card (M9407) in rows A or C of the same slot, or
(2) a second dual-height module in the same slot.

Use the following procedure to remove modules from the BA23 enclosure
(Figure 3-2):
1.

Turn off the system and unplug the ac power cord from the wall outlet.

Remove the rear cover. Label and disconnect all cables.

Loosen the two screws that hold the 110 panel in place. Swing the
assembly open and remove the ground strap screws.

Note the orientation of the red stripe on each cable on the I/O panel.
Label and disconnect the cables from the VO panel.

3-4 BA23 Enclosure Maintenance

•
Figure 3-2:

Removing Modules

3
4

, i
I .

"4.;

" "

I,
·· .. ,

...s'

·• •
.

MlO-OOO234

FRU Removal and Replacement

3-5

Unlock the module release levers by simultaneously pulling out the
right and left levers (Figure 3-3).

Figure 3-3:

Releasing the Ejector Levers

---...(

--MLO-(x)()235

Slide the module partially out of the backplane. Note the orientation
of the red stripe on any cable connected to the module. Label and
disconnect any cables from the module.

Note the module's location in the backplane, then remove the module.

Use the following procedure to install modules:
1.

Make sure you correctly set any jumpers and switches on a new
module. Compare the settings to the old module or refer to the user's
or installation guide supplied with the new module.

Reverse steps 1 through 6 of the removal procedure.

Retest the system to confirm that the system is working correctly.

3 6 BA23 Enclosure Maintenance

3.3 Control Panel
Remove the control panel as follows:
1.

Turn off the system and unplug the ac power cord from the wall outlet.

Remove the front plastic cover by holding each end and pulling the
cover away from the system.

Refer to Figure 3-4 for steps 3 through 8.
3.

Remove the front retaining bracket.

Push the BA23 frame forward.

FRU Removal and Replacement

3-7

I
Figure 3 4:

Accessing the Control Panel

....

00
00

MlQ.--OO()236

BA23 Enclosure Maintenance
-

•
5.

Remove the storage cover.

Remove the four screws on the control panel assembly.

Disconnect the Berg connector from the control panel.

Disconnect the power supply connector from J7 on the power supply.

Installation Note
After installing a control panel, make sure the LTC switch and the restart
enable switch on the control panel's printed circuit board are in the out
position.

3.4 Mass Storage Devices
Use the procedures in Sections 3.4.1 through 3.4.3 to remove drives and
interconnect cables.

3.4.1 RX- and TK-Series Drives
Remove an RX-series diskette drive or TK-series tape drive as follows:
CAUTION:

•

Static electricity can damage integrated circuits. Use the wrist strap
and antistatic mat found in the Antistatic Kit when working with mass
storage devices.

•

RX- and TK-series drives are single FRUs. Do not try to take them
apart or remove their printed circuit boards. You must use special test
equipment to make any drive adjustments.

•

Do not turn off the system with a TK-series cartridge in place. Never
put your hands or other objects in the cartridge opening.

FRU Removal and Replacement

3-9

'IUrn off the system and unplug the ac power cord from the wall outlet.
Remove the front and rear covers.

Refer to Figure 3-5 for steps 2 through 6. The figure shows an RX50 drive.
2.

Remove the front retaining bracket.

Push the BA23 frame forward.

Remove the storage cover.

Disconnect the signal cable and dc power cable from the drive by pulling
straight up on the connectors.

Push down on the release tab, slide the drive forward, and remove.

RX-Series Installation Note
Remove the cardboard shipping insert from a newly installed RX50 drive.
Before returning a defective drive, install the shipping insert.

TK-Series Installation Note
If the BA23 did not have a TK-series drive before, make sure you install
the new access door shipped with the drive. Do not use the access door that
came with the enclosure.

3-10

BA23 Enclosure Maintenance

•
Figure 3--5:

Accessing the Diskette or Tape Drive

3
~

-----:~

------- -- 1.

Ml0-000237

FRU Removal and Replacement

3--11

3.4.2 RD-Series Fixed-Disk Drives
Remove an RD-series fixed-disk drive as follows:
CAUTION:

•

Static electricity can damage integrated circuits. Use the wrist strap
and antistatic mat found in the Antistatic Kit when working with mass
storage devices.

•

Handle any fixed-disk drive with care. Dropping or bumping the drive
can damage the disk surface.

Remove both covers. Unplug the ac power cord from the wall outlet.

Refer to Figure 3-6 for steps 2 through 6. The figure shows an RD51 drive.
2.

Remove the front retaining bracket.

Push the BA23 frame forward.

Remove the storage cover.

CAUTION: Do not touch the exposed head positioner flag on the front right

side of the RD51 fixed-disk drive. Doing so can cause the head positioner
flag to rotate, resulting in damage to the drive.
5.

Remove the power plug and two ribbon cables from the RD-series drive.

Push down on the release tab, then slide the drive forward and remove.

If you are returning a drive, pack the drive in the replacement disk
drive's shipping carton. If you do not have the shipping carton, you can
order one from DIGITAL.

See Microsystems Options for procedures on removing mass storage device
FRUs.

3-12

BA23 Enclosure Maintenance

Figure 3-6:

Removing a Disk Drive (Example)

DO NOT
TOUCH

--.

MlO-OOO23B

Installation Notes
You must format a newly installed RD-series drive before you test the
system and use the drive. You have to format a fixed-disk drive only when
you replace a complete drive assembly.
Before you format a drive, write-protect any other RD-series drives in
the system. Remember to write-enable these drives when formatting is
complete.

FRU Removal and Replacement

3-13

I
To configure an RD-series drive as DUO or DUAO, make sure the jumper
clip is set at DS3. Figure 3-7 shows the jumper clip on an RD52 drive.
Figure 3-7:

RD-Series Jumper Clip (Example)

FRONT OF DRIVE

OSl

OS3
OS2

OS4

REAR OF DRIVE

MlO-OOO239

3.4.3 Interconnect Cables for Mass Storage Devices
The TK-series tape drive has an interconnect cable that runs to the TQK
controller module. RD- and RX-series disk drives have an interconnect
cable that runs to the RQDX controller module.
These interconnect cables are routed through the access door area on the
signal distribution panel, and under the modules in the card cage.
After you remove the drive(s) from the BA23 enclosure, remove the
interconnect cable(s) as follows:
1.

Release the TQK interconnect cable from the wire tie that holds the
cable to the access door on the signal distribution panel.

3-14

BA23 Enclosure Maintenance

•
2.

Remove the two screws that hold the access door to the signal
distribution panel. Remove the access door (Figure 3-8).

Figure 3-8:

Removing the Access Door

leo
.-:

e: e

J iPw3

ft"

,jJ

J JJ

G
•
,
,'
,\
,'

.\\

,, ,'

,, ,

'\,

\,,

MLO--DOO24Q

Disconnect the RQDX interconnect cable behind the access door
opening. Move the cable to the side, to provide working room.

Remove the module (if any) in slot 8 of the backplane.

Pull the interconnect cabler s) from the rear of the enclosure through
the access door opening, backplane, and card cage.

Installation Notes
Push the cable through from the front of the enclosure to the rear.
The TQK interconnect cable has a "THIS SIDE UP" marking on one side.
Make sure the striped side of the cable is nearest the front fan in the
enclosure.

FRU Removal and Replacement

3-15

•
3.5 CPU I/O Insert
Remove the CPU I/O insert as follows (refer to Figure 3-9 for steps 1
through 5):
1.

Tum off the system and unplug the ac power cord from the wall outlet.

Remove the rear cover. Label and disconnect all external cables
connected to the CPU I/O insert.

Loosen the two screws that hold the I/O panel in place. Swing the 1/0
panel open and remove the ground strap screws.

Note the orientation of the red stripe on each internal cable connected
to the CPU I/O insert. Disconnect the cables from the CPU I/O insert.

Remove the screws that hold the CPU I/O insert to the I/O panel.
Remove the CPU I/O insert, using the example of a type-B insert
removal shown in Figure 3-9.

3-16

BA23 Enclosure Maintenance

Figure 3-9:

Removing the CPU 1/0 Insert

·/V1
,-

- "",,i')

,
'c
o .

._.
,

, ,
, '

MLO-OOO241

FRU Removal and Replacement

3-17

3.6 Backplane Assembly
Remove the backplane assembly as follows (Figures 3-10 through 3-13):
1.

Turn off the system and unplug the ac power cord from the wall outlet.

Refer to Figure 3-10 for steps 2 through 4.
2.

Remove the front and rear covers. Disconnect and label all cables.

Remove the rear retaining bracket and slide the BA23 frame completely
out.

Remove both the storage cover and the logic cover.
On older systems (Figure 3-10), the logic cover has eight screws and
does not extend to the frame at the rear.
On newer systems, the logic cover has four screws and extends to the
frame at the rear. The logic cover slides onto the frame by means of
two tabs.

3-18

BA23 Enclosure Maintenance

.... -

I
Figure 3-10:

Removing the Retaining Bracket and Covers

MLO-OOO242

Open the rear 110 panel by loosening the two captive screws. Refer to
Figure 3-9, step 3. Note the orientation of the red stripe on any cables
connected to the panel. Label and disconnect the cables.

FRU Removal and Replacement

3-19

Refer to Figure 3-11 for steps 6 through 10.
6.

Note the location of all modules, then remove them.

On some systems, remove the baffle from the front fan.

Remove any mass storage devices. See Section 3.4.

Remove the RX- and RD-series signal cables from J6, J2, and J7 on the
signal distribution panel.

10. Remove all power supply connectors and front control panel connectors
from J1, J4, and J2 on the signal distribution panel, and from J9 on
the power supply.

3-20

BA23 Enclosure Maintenance

Figure 3-11:

Accessing the Backplane

MLO--OOO243

FRU Removal and Replacement

3-21

Refer to Figure 3-12 for steps 11 and 12.
11. Loosen the two screws on the access door. Remove the access door and
disconnect the cable(s) from the backplane.
12. Remove the four screws that hold the backplane in place.
Figure 3-12:

/
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a
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•

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•

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Removing the Backplane Screws

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MLO-OOO244

13. Pivot the left side (CD rows) of the backplane assembly 45 degrees
toward the rear, then lift the backplane straight up (Figure 3-13).

3-22

BA23 Enclosure Maintenance

•
Figure 3-13:

Removing the Backplane

====::::]]

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MlO-OOO245

3.7 Power Supply
The power supply does not have any replaceable printed circuit boards. You
cannot adjust the power supply. The +5 Vdc and +12 Vdc regulators are
fixed.
When you replace the power supply, make sure the new unit has the same
part number as the old unit (Table 3-1).
Remove the power supply as follows (refer to Figure 3-14 for cable
locations):
1.

Turn off the system and unplug the ac power cord from the wall outlet.

Remove the front and rear covers, the retaining bracket, and the mass
storage cover using the procedure in Section 3.6, steps 2 through 4.

FRU Removal and Replacement

3-23

Refer to Figure 3-14 for steps 3 through 7.
3.

On some systems, remove the fan baffle and baffle holder from the front
fan.

Disconnect the backplane's power cable from J9 on the power supply
and J1 on the signal distribution panel.

Disconnect the mass storage power cable from J8 on the power supply.

Disconnect the front fan's power cable from JI0 on the power supply.
Disconnect the control panel's power cable from J7. Both connectors
are keyed and have a locking assembly.

Remove the five screws holding the power supply to the BA23.

3-24

BA23 Enclosure Maintenance

•
Figure 3-14:

Power Supply Cables

J10

MlO-OOO246

FRU Removal and Replacement

3-25

Refer to Figure 3-15 for steps 8 and 9.
8.
9.

Lift the power supply assembly out of the BA23 and place it on top of
the card cage.
-

Disconnect the power connector from the rear fan.

Figure 3-15:

Removing the Power Supply

,
I

'--",

,'
I
I

MLO-DOO247

3-26

BA23 Enclosure Maintenance
-...

...

Installation
Install the power supply as follows:
-

Place the new power supply on top of the card cage. Connect the rear
fan's power cable.

CAUTION: The rear fan's power cable is not keyed. Make sure the curve of

the connector matches the curve of the fan housing (Figure 3-16).
Figure 3-16:

Fan Housing Connection

MLO-OOO248

Place the power supply in position. Make sure you route the rear fan
cable over the top of the rear fan (Figure 3-17).

To complete the installation, reverse steps 1 through 8 of the removal
procedure.

FRU Removal and Replacement

3-27

Figure 3-17:

Rear Fan Cable Position

MLO-OOO249

3.8 Rear Fan
Remove the rear fan as follows:
1.

Turn off the system and unplug the ac power cord from the wall outlet.

Refer to Figure 3-10, steps 2 and 3. Remove the front and rear covers.
Label and disconnect all cables. Remove the rear retaining bracket and
slide the BA23 frame out of the rear of the enclosure.

Refer to Figure 3-18 for steps 3 and 4.
3.

Remove the power supply and disconnect the rear fan power connector
(Section 3.7).

Remove the four screws and spacers that hold the fan to the BA23.
Remove the fan.

3-28

BA23 Enclosure Maintenance

•
Figure 3-18:

Removing the Rear Fan

MLO-OOO250

Installation
Install the rear fan as follows (refer to Figure 3-19 for steps 1 and 2):
1.

Align the fan guard to the screw holes. Insert the screws. Make sure
the cross members of the fan guard face the inside of the unit, as shown.
Place the spacers on the screws.

Align the fan by placing the screw holes over the spacers. Tighten the
screws. Make sure the fan is oriented as shown. The fan must draw
air away from the power supply.

To complete the installation, reverse steps 1 through 3 of the removal
procedure.

FRU Removal and Replacement

3-29

Figure 3-19:

Installing the Rear Fan

MLO~OOO251

3.9 Front Fan
Remove the front fan as follows:
l.

Turn off the system and unplug the ac power cord from the wall outlet.

Remove the front cover.

Refer to Figure 3-20 for steps 3 through 7.
3.

Remove the front retaining bracket and push the BA23 frame forward.

Remove the storage cover.

On some systems, remove the fan baffle and the baffle mounting from
the front fan.

Disconnect the front fan power cord from JI0 on the power supply and
from the fan.

Remove the four screws (with spacers) that hold the fan and fan guard
in place.

Remove the fan (Figure 3-21).

3-30 BA23 Enclosure Maintenance

•
Figure 3-20:

'",,

Accessing the Front Fan

,,'I
OLDER SYSTEMS ONLY

I
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>--,..c po , '
J, "

)

-r -

7
J 0

MlO-OOO252

FRU Removal and Replacement

3-31

•
Figure 3-21 : Removing the Front Fan

SCREWS (4)

INTAKE
FAN
GUARD

SPACERS
( 4)
SCREWS (4)
AND
SPACE RS (4)

MlQ--{)()()253

Installation
Install the front fan as follows:
1.

Remove the power cable and intake fan guard from the old fan for use
on the new fan.

CAUTION: The front fan's power cable is not keyed. Make sure the curve of

the connector matches the curve of the fan housing, as shown in Figure 3-20,
step 5.
2.

Assemble the components in the order shown in Figure 3-21, from left
to right: the four screws, four spacers, the intake fan guard you removed
from the old fan, four spacers, the inside fan guard, then four screws.

3. Attach the complete fan assembly to the BA23 frame, using the order
and orientation shown in Figure 3-21. The fan must draw air away
from the mass storage area.

3-32

BA23 Enclosure Maintenance

3.10 MicroVAX Battery Backup Unit (BBU)
Remove the battery backup unit (BBU) for the time-of-year clock in
MicroVAX systems as follows:
1.

Perform steps 1 through 4 in Section 3.5 to access the rear of the CPU
110 insert.

Disconnect the BBU cable from the CPU 1/0 insert (Figure 3-22).

Figure 3-22:

Disconnecting the Battery Backup Unit

.- . I

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'..,, I

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•

MLO-OOO254

FRU Removal and Replacement 3-33

Carefully spread the plastic BBU holder and pop out the battery backup
unit (Figure 3-23).
---

Figure 3-23:

Removing the Battery Backup Unit

MLO-OOO255

3-34

BA23 Enclosure Maintenance

Appendix A

BA23 System Interconnection Pinouts
Figure A-I shows the system interconnection pinouts for the BA23
enclosure.

BA23 System Interconnection Pinouts

A-1

Figure A-l:

BA23 System Interconnection Pinouts

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PlHSJ,S 9 21 2S 33 3S 37 39.!"5 ,p .o.HC49.-JtE
GFIOI./f'j D PINS

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PlNSI,J.S,7.9,11 lJ 15 11 19.21 23 25 27 29.31,AH(3)
ARf Gf\()UIoIO PlHS

-.'"

Pl1'fS2" I; 8.11 1215, 16. '9,,","D20MEG~HOPI"'S

PINS " ).5. 7 9 '1 13,17 19 2' 23.25 27 29.31 ot.H033.u:tE
GROU",p F'WS-

Tt<E CASU OfIlGj"'"n"'G ON THE POWEll SlJPf"\.Y AT JI SPUTS ,,.10

r....a C,.t.8lES OfIIE FOA EACH Of Tt<£ 1'WO POSSIBLE ORIVtS

Dl.JE TO INSU~FtClENT POWER SUPf'l¥ <:.A.JW:!TV MD t.o F~T

""'-Nh COHtIIOl.S OHl'r 1 HARD 0ISIt IS SU+iQA lED IN Tt<E ...... 3

THE CABlE fOfI THE RiAA fAAllS oO.H INTEGR4I. I'IUIT Of 'mE
POWEFI SU"","-V ·SSEMllY

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ML0-000266

A-2

BA23 Enclosure Maintenance

Appendix B

Related Documentation
The following documents contain information relating to MicroVAX or
MicroPDP-ll systems,
Order Number

Document Title
Modules

EK-CABl6-TM
EK-CXY08-TM
EK-DEQNA-UG
EK-DHVll-TM
EK-DLVIJ-UG
EK-DMVll-TM
EK-DMVll-UG
EK-DPVll-TM
EK-DPVll-UG
EK-DRVIJ-UG
EK-DRVWA-UG
EK-DZQll-TM
EK-DZQll-UG
EK-DZVll-TM
EK-DZVll-UG
EK-IEUQI-UG
EK-KA630-UG
EK-KA640-UG
EK-KA650-UG
EK-KDA5Q-UG
EK-KDJIB-UG

CXA16 Technical Manual
CXY08 Technical ~anual
DEQNA Ethernet User's Guide
DHVll Technical Manual
DLVll-J User's Guide
DMVll Synchronous Controller Technical Manual
DMVll Synchronous Controller User's Guide
DPVll Synchronous Controller Technical Manual
DPVll Synchronous
Controller User's Guide
•
DRVll-J Interface User's Manual
DRVll-WA General Purpose D~A User's Guide
DZQll Asynchronous ~ultiplexer Technical :'v1anual
DZQll Asynchronous :Vlultiplexer User's Guide
DZVll Asynchronous :Vlultiplexer Technical Manual
DZVll Asynchronous :Vlultiplexer User's Guide
IEUll-A/IEQll-A User's Guide
KA630-AA CPU :\lodule User's Guide
KA640-AA CPU :Vlodule User's Guide
KA650-AA CPU :Vlodule User's Guide
KDA50-Q CPU :'v1odule User's Guide
KDJll-B CPU Module User's Guide
KDJll-D/S CPU Module User's Guide
KDFll-BA CPU Module User's Guide
K.\lVll Programmable Communications Controller User's Gui.de
K.\lVll Programmable Communications Controller Technical
Manual

EK-KDJID-UG
EK-KDFEB-UG
EK-K,,\1Vll-UG
EK-K.\1Vll-TM