Digital PDFs

EK-186AB-MG-2

May 2000

114 pages

Original

6.3MB

view download

OCR Version

4.3MB

view download

Document:	BA23 Enclosure Maintenance
Order Number:	EK-186AB-MG
Revision:	2
Pages:	114
Original Filename:

OCR Text

f9:9:0:0,0:4:0.8.¢:6.4

IBORIDKKK
10,440,900

KHHEHR
HER
X

p.¢.4.4.94
HOHRAK

fe099.9.084

KRADOOOOLK
p8.0.¢.9.0.6.0.6,0.¢0.¢4

0.80.9.0.4.9.0.99.0.¢¢¢

F.9.8.0.9.0.4:4:0:0.6.0.8.8:0.0.4.4
KHNOCOOOOIRAANAKY

D0 40000000480 0¢800030¢4
b 0.9:0.0.0.0.0.00.98 008000004549

J8.0.0.0.0.0.0.000.980.9.0.080080849044

OGOONGON0N0N0OCK
I
OO0

Bepteraber 1980

The information 1n this document 18 subject to change without notice and should not
be construed as a commitment by Digital Equipment Corporation. Digital Equipment
Corporation sssumes no responsibility for any errors that may appear in this document.
The scftware described in this document is furmished under a license and may be used or
copied only in accordance with the terms of such license.

No responsibility is assumed for the use or reliability of software on equipment that is not
supplied by Digital Equipment Corporation or its affiliated companies.

Restricted Rights: Use, duplication, or disclosure by the U. 8. Government is subjest to
restrictions as set forth in subparagraph (c¢) (1) (ii) of the Rights
in Technical Data and
Computer Scftware clause at DFARS 252.227-7013.
Copyright ®

Dhgital Equpment Corporation

1980

FCC NOTICE: The equipmeat deaaribed in this manua)l generates, uses, and may emit
radio frequency energy. The equipment has been type tested and found to comply with
the limits for 2 Class A& computing device pursuant to Subpart J of Part 15 of FCC
Rules, which are designed to provide reagonable protection against such radio frequency
interference when operated in a commervial environment. Operation of this equipment in
s resmidentinl aren may cause interference, in which case the user at his own expense may
be required to take menmsures to correct the interference.
bl

The following are trademarks of Digital Equipment Corporation:

DEC
DEC/CMS
DEC/MMS
DECnet
DECsystem-10
DECSYSTEM-20
DECUS
DECwriter

DIBOL
EduSystem
IAS
MASSBUS
PDP
PDT
RSTS

UNIBUS
VAX
VAXcluster
VMS
VT

RSY

This document was prepared and published by Educations] Services Development and
Publishing, Digital Equipment Corporation.

Contents
Preface

Chapter 1

BA23 Enclosure Description

1.1

Introduction .......... ... ... @it

1-1

1.2

Mass Storage Device Areas ..........................

1-2

CentrolPanel . ...

1-3

Backplane Assembly

.................
... ... .. . ...,

1-8

1.4.1

Signal Distribution Panel . . . . ......................

1-8

14.2

Backplane

1-10

1.5

PowerSupply........

VOPanel . ...

1.7

Fans.

1.8

.... ...

...

.. . .. ..

1-13

... . .. . . . e

1-16

. ....... i e

1-18

Configuration Guidelines . . ..........................

1-19

1.8.1

Module Order and Configuration ....................

1-20

1.8.2

Configuration Worksheet ... .......................

1-20

Chapter 2
21

Installation

PreparingtheSite .........
... .. .. ... .. .. . o,

2-1

2.1.1

Dimensions

..........
... ... ... . .. .
i

2-1

2.1.2

Additional Equipment .. ....... ... ... ... ... ... ...,

2-3

213

Acoustics .. ........ .. e

2-3

2.14

Operating Environment . ..........................

2-3

2.15

StaticElectricity .............
. ... .. .. ...

2-3

216

HeatDissipation ................
... .. .. ... .. ...,

2-4

2.1.7

Temperature and Humidity Ranges . .

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

218

Electrical Requirements . . . ........................

2.2

Unpacking the Shipment .. ........
... ..............

2-5

2.3

Installingthe BA23 Pedestal .........................

2-6

2.3.1

2.3.2
2.3.3
2.34

...
... ........
Air Flow Considerations. . . .. .......
Installing the Console Terminal . . ...................
Connecting the Console Terminal to the System ........

2-7

2-7
2-7

2.3.5

Connecting External Devices ... ... .......
... ... ...
2-9
... . ... 2-10
.....
... ...
Connectingtoa Network .......

2.3.6

Setting ontrols on the System . ....................

2-11

2.3.6.2

2.3.6.3

Setting the Baud Rate (MicroPDP-1D . ... .. ... ......
Seiting Controls on the CPU I/O Insert (MicroVAX) ...

2-12
2-14

23.6.4

Checking the Voltage Setting . .. .. ................

2-15

Checking the Circuit Breaker ......................
...
Completing the Installation . . . ..................
2.3.8
Installing the BA23 Tabletop Version. . . ................
2.4

2-16
2-16

2.5

2-20

2.3.6.1

Boot Select (MicroPDP-11/53 only) . . 2-12

2.3.7

Installing the BA23 Rack Mount Version . ... ............

Chapter 3
31

2-17

FRU Removal and Replacement

FRUS ...
e
e
Modules ....... ...

3-1
3-4

ControlPanel .. ... ... ... ... ... .

3-7

RX-and TK-Series Drives .. ... ....................
RD-Series Fixed-Disk Drives . ... ... ................
Interconnect Cables for Mass Storage Devices . . . . ......

3-9

3-12

3.6

CPUVOINSert. . ... oottt
... oL
.....
... ...
BackplaneAssembly .....

3-16
3-18

PowerSupply......

... . ... ...

3-23

RearFan ...........
. . . .. .
e

3-28

FrontFan.....

3-30

3.10

MicroVAX Battery Backup Unit (BBU) .................

3-32

34 MassStorageDevices. . .............
... .
3-9
3.4.1

3.4.2

3.4.3
35

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

3-14

‘

Appendix A

BA23 System Interconnection Pinouts

Appendix B

Related Documentation

index

Ei_gures
1-1

BAZ23 Enclosure, Pedestal Version (MicroVAX). . ..........

1-2

BA23 Mass Storage Locations .. ......................

1-3

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

1-4

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

1-5

BA23 Signal Distribution Panel . .. .................
...

1-6

BA23 Internal Cabling (Example) . ...... ..............

1-7

BA23 Backplane Grant Continuity

1-8

H9278 Backplane Termination Resistors . ... ............

1-9

BA23 Power Supply . ...... ..

1-10 H7864 Power Supply (Rear View)
1-11

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

BA23 VO Panel ........ ... ...

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

. i

1-12 BA23 I/O Inserts and Adapter Plate ...................

1-13 BA23 Front Fan Baffle and Louvered Frame
1-14

BA23 Configuration Worksheet . ......................

2-1

BA23 Enclosure Dimensions .........................

2-2

Shipping Carton Contents . .......... ................

2-3

Removing the RearCover

2-4

Connecting the Console Terminal (Example) .. ...........

2-5

Connecting External Devices . ... .....................

2-6

Connecting an EthernetCable ........................

2-7

Boot Select Switch (MicroPDP-11/53 only). .. ............

2-8

Setting the Baud Rate (MicroPDP-11). .. ...............

2-9

CPU 1/O Insert Controls (MicroVAX) . ..................

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

2-10 Checking or Changing the Voltage Setting.
2-11

Checking the Circuit Breaker

2-12 Attaching the Power Cord

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

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

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

2-13

Preparing the Tabletop Configuration ..................

2-18

2-14

Removing the Base Screws ..........................

2-19

2-15

Completing the Tabletop Configuration .. ...............

2-20

2-16

BA23 Rack Mount Version . . ... ......................

2-21

2-17

BA23-AR Rack Mount KitContents ...................

2-22

2-18

Preparing the Brackets . ....... ... ... ............
..

2-23

2-19

Mounting the Brackets. . ............................

2-24

2-20

Preparingthe Rack .......................
... ... ...

2-25

2-21

Mountingthe LeftRail

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

2-26

2-22

Attaching the Stop Plate and Brackets . ................

2-27

2-23

Attachingthe StopCable . . . .........................

2-28

2-24

Preparingthe Front Cover...........................

2-29

2-25

Attaching the Front Cover ..........................

2-29

3-1

BA23 Enclosure FRUs . . ....... ... .

... ....

3-3

3-2

RemovingModules . . ... ........ ... . ...

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

3-5

Releasing the Ejector Levers . .. ......................

3-6

3—4

Accessing the Control Panel . ... . .....................

3-8

3-5

Accessing the Diskette or Tape Drive. . . ................

3-11

Removing a Disk Drive (Example) .. ... ................

3-13

RD-Series Jumper Clip (Example) . ....................

3-14

Removingthe Access Door .. ... ......................

3-15

3-9

Removing the CPUI/OlInsert ........................

3-17

3-10

Removing the Retaining Bracket and Covers.

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

3-19

3-11

Accessingthe Backplane ............................

3-21

3-12

Removing the Backplane Screws ......................

3-22

3-13

Removing the Backplane ... .........................

3-23

3-14

Power SupplyCables ...........
... ... ... ..........

3-25

3-15

Removing the Power Supply .........................

3-26

3-16

Fan HoucingConnection ............................

3-27

3-17

Rear Fan Cable Position ............................

3-28

3-18

Removingthe Rear Fan . ... .........................

3-29

3-19

Installingthe Rear Fan .............................

3-30

3-20 Accessingthe FrontFan ............................

3-31

3~-7

...

3-21

RemovingtheFrontFan ................ ............

3-32

3-22 Disconnecting the Battery Backup Unit. ... .............

3-33

3-23 Removing the Battery Backup Unit . . ..................

3-34

A-1

A-2

BA23 System Interconnection Pinouts . . ... .............

Tables
1-1

BA23ControlPanel .... ... ... ...

... .. ..

... .. ... ..

1-5

1-2

BA23 Control Panel PC Board Components . . . ...........

1-7

1-3

BA23 Control Panel PC Board Jumpers.................

1-7

1-4

BAZ23 Signal Distribution Panel Connectors. . ............

1-9

1-5

BA23 Backplane Connectors .........................

1-12

1-6

H7864 Power Supply Specifications . ...................

1-15

1-7

BA23 Power Supply Front Connectors . . .. ..............

1-16

1-8

BA23 Cutout and Insert Sizes ........................

1-17

1-9

Power, Bus load,and /O InsertData ... ...............

1-21

2-1

Temperature Ranges, Humidity Ranges, and Altitude Limits

2-2

240V PowerCords.............00iiiiiiiiiniennenns

2-5

2-3

BA23 Electrical Requirements . .. .....................

2-5

3-1

BA23FRUs ........c. ittt

3-2

vil

PAGE viii

INTENTIONALLY LEFT BLANK

Preface
This guide provides reference, installation, and maintenance information
on the BA23 enclosure. This enclosure is intended for MicroPDP-11 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 a.ca and capacity, backplane, signal distribution, power
distribution, I/O 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.

CAUTION

Provides information to prevent damage to equipment or software.

NOTE

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)

BA23 Enclosure Description

1-1

1.2 Mass 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 instaii 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 1/0 distribution panel. The
number of drives you can use depends on the space available in the [/O
panel and backplane, and the amount of power available to run the drive
controllers.
Figure 1-2:

BA23 Mass Storage Locations

MLO-000 195

1-2

BA23 Enclosure Maintenance

1.3 Control Panel

The BA23 has either a 4- or 6-button control panel as follows:
e

Systems with a 4-button control panel support only full-height mass

Systems with a 6-button control panel suppert either full-height or half-

storage devices (Figure 1-3).
height devices (Figure 1-4).

Figure 1-3:

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

TEST POINTS

SWITCH 2

[}

SWITCH 1

5y +12v
i

|
|

|
)

Fixed Disk 0

Write Protect

Halt

Run

[

Ready

Restart

DC OK l

o
w1 Py

)

o |

|2
l E w2

|
'

]

Micro

[IVAX (I

POWER
ON/OFF

P SWITCH

m—

-d

20-PIN
CONNECTOR
ON PC
BOARD
MLO-000198

BA23 Enclosure Description

1-3

Figure 1-4:

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

TEST POINTS

SWITCH 2

[]

SWITCH 1

5y e12v
i

]

| Fixed Disk 1 Fixed Dk 0
|wme Protect

Write Protect

Halt

~ | = Reay

Lewa

Ready

Restart

|
|

o
wi

|
w2

)

||Micro
ON/OFF

,M’

SWITCH

ORI

|
i

—%

< -J
20-PIN

CONNECTOR
ON PC
BOARD

i-4

BA23 Enclosure Maintenance

MLO-000197

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

On/Off

Description
Rocker switch with orange LED indicator.

1
LED on

System ac power 15 on.

System ac power is off.

LED off

DC OK

Green LED indicator.

All dc voltages are present and within tolerance.

Off

All de voltages not present or within tolerance.

Run

Green LED indicator.
On

The

CPU

1is

run

mode

(normal

operating

condi-

tion).

Off

Halt!

The CPU is in console made.

Pushbutton switch with red LED indicator.
Out
LED off

Puts the CPU in program /O
tion for running user software)

wmode (normal posiPushing the Halt

switch twice (in, then out again) puts the system in console mode, where the system accepts only console commands.

Restart?

Fixed Disk 0
Write Protect

Stops the system. Commands cannot be entered when the

LED on

button is in.

Momentary-contact pushbutton switch.

When you press

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.

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

'You can disable the Halt switch by setting the halt enable switch on the CPU I/O insert to the disable position (dot cutside of circle). In this case, pressing

ange indicator but does not halt the system.

turns on the or-

2You can disable the Restart switch by setting the restart enable switch on the control panel printed circuit board to the disable position.

3 £nclosuie Descrigtion

1-5

Table 1-1 (Cont.):
Control

BA23 Control Panel

Setting

Description

QOut

Allows the system to read from and write to the disk (nor-

Prevents the system from writing to the disk.

LED off

LED on

Ready

mal operating position).

lows the system to read from the disk.

Still al-

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

Out

Puts the disk on-line tnormal operating position). The sys-

LED on

tem can read from and write to the fixed disk.

In
LED off

Takes the disk off-line. The system 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-buttun control panel.

Out
LED off

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 a seec-

ond half-height, fixed-disk drive. Only on the 6-button control panel.

Out
LED on

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

In
LED off

Takes the disk off-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.

i-6

BA23 Enclosure Maintenance

Table 1-2:

BA23 Control Panei PC Board Components

Component

Function

Switch 1

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

Switch 2

Enables the Restart switch on the control panel.

20-pin J1 connector

Connects the backplane assembly cable.

Wi, W2, W3

Table 1-3 hsts the jumpers and pin connections.

Jumpers
+5Vand +12V

Serve as system test points.

test points

Table 1-3:

BA23 Controi Panel PC Board Jumpers

Jumper

Pin Connection

Condition

Top and center
tfactory position)

Enables RD drive 0. Used when RD drive 0 is present.

Bottom and center

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

Top and center

ifactory position)

Enables RD drive 1.

Bottom and center

Disables RD drive 1. Not used.!

Top and center

present or not.
Disables

restart

logic

Used whether RD drive 1 is

BA23-C

thottom

enclo-

sure) in an H9642 cabinet.

Bottom and center

Enables restart logic in BA23-A (top enclosure) in
an H9642 cabinet, and in the standalone BA23 system.

'The W2 bottom and center setting is not used because RD drive 1 has uo Ready light to disable.

BA23 Enclosure Description

1-7

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

Signal distribution panel (for mass storage devices)

Sheet-metal mounting bracket

Backplane (H9278)

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

)
13

NEAED ISR

J"KEUU'SKO

J2FREL OSSR ()

26 HEMUOVABLE DISK 142

AR *L\

)

ST rfl & | “—
J4 CONTROL PANEL

POWER SUPPLY

J2 (NOT LABELED)
MLO-000198

i-8

BAZ23 Enclosure Maintenance

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

Table 1-4:

BAZ3 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 ROM code usually labels the RX50 drives as disk
unit 1 tDUAD) and disk unit 2 (DUA21.

J7 Fixed Disk 0,
J2 Fixed Disk 0

Provide signals to the first fixed-disk drive in port 0 (left side).
The ROM code usually labels this drive as disk unit 0 ({DUAO).

J1 Fixed Disk 1.
J5 Fixed Disk 1

ports this configuration only with half-height drives. The ROM

J4 (Control Panel)

Provides signals to the control panel printed circuit board.

J1,J2, 43, J4

These

the

signal

distribu-

J7.410

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

signal

distribu-

Provide signals to a second fixed-disk drive.

The BA23 sup-

code usually labels this drive as disk unit 1 (DUl

connectors

are

not

part

tion panel. They are on the backplane assembly.

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

DISTRIBUTION
PANEL

DRIVES

LRIVES

FRONT

CONTROL
PANEL
&0-0001'99

1.4.2 Backplane
the backplane (H9278) uses the extended LSI-11 bus. The LSI-11 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 D) run across each slot. Figure i-7 shows the
grant continuity for the backplane.
A dual-height module has connectors that fit into two rows of a backr lane
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. C..e quad-height module occupies one backplane slot.
Figure 1-7:

BA23 Backplane Grant Continuity

The CD rows of slots 1, 2, and 3 are interconnected. This feature is called
the private memory interconnect (PMI). To determine CPU and memory
slots, see the appropriate CPU maintenance documentation.

If you install a duai-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 for'r 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.

cable,

which

car-

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

board.

J3 and J::

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

See Appendix A for the names of signals on these connectors.
The backplar.e supports up to 30 ac loads and 20 dc loads. An ac load is
the amount of capacitance a module presents to a bus signal line. One ac
load equals 9.25 picofarads (pf). A dc load is the amount of dc leakage
a medule presents to a bus signal line. One dc load is approximately 145
microamperes (nA). The backplane presents seven ac loads and no dc loads.
The H9278 backplane also includes termination resistors, on tne 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

H9273 Backplane Termination Resistors

;

T
S bt SR
N

Figure 1-8:

TERMINATION
RESISTORS

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 suj ply, depending on the enclosure model number:
H7864, H76¢4A, or H7864B.

Figure 1-9:

BA23 Power Supply
POWER SUPPLY

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)
t0 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 H and 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 voitages to +12 Vdc by changing
a power supply jumper. However, the KA630 CPU module’s thermal and
acoustical specifications are based on the +16 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 Qutput

Voltage

+5.1 Vde +/-2 5%

Current

4.5 A m:nimum
36.0 A maximum

Overcurrent

37 A mirumum (averaged over 1 msec, must not tnp)
42 A maximum (averaged over 1 msec: must trip)

Ripple and noise
+12 Vdc Output
Voltage

+12.1 Vde +/-2.5%

Current

0 A mimmum
7.0 A maximum

7.2 A minimum (averaged over ! msec; must not tnip)

Normal
overcurrent

8.0 A maximum (averaged over 1 msec; must tnp)

Startup

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 mimmum (must not trip)
13.0 A for 500 usec must trip)

overcurrent

Ripple and noizse

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

JEC (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 Suppiy (Rear View)

VOLTAGE

SELECT
SWITCH

CIRCWIT

BREAKER

]

REMOTE

POWER

CONNECTOR
MLO-000203

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), or J4 (if you do not have an RD50-series fixed disk).

J9
J10

Provides the power for the backplane.

nates at J1 of the backplane.

The backplane power cable termi-

Provides power to the fans.

1.6 /G Panel
You use the I/0 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 I/O
panel. Filtered connectors and inserts are part of the option’s cabinet kit.

i-16

BA23 Enclosure Maintenance

Figure 1-11 shows the IO 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 (/O Panel

€d

°L_®

CPU CUTOUT

M O-000204

Table 1-8:

BA23 Cutout and Insert Sizes

Type

Quantity

Inches

Millimeters

Cutout

06x32

15 x 81

Insert

10x4.0

25 x 102

Cutout

225 x32

57 x 81

Insert

25x33

64 x 84

You can install three more type A inserts by removing the . -acket 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 /O inserts and Adaptler Plate

ADAPTER

TYPE A
INSERT

PLATE

WLO-000205

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
e

A frame without airflow louvers

Figure 1-13: BA23 Front Fan Baffle and Louvered Frame
FAN BAFFLE

AIR FLOW
LOUVERS

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 arcas:

Backplane
/O panel
Power supply
Mass storage devices

BA23 Enclosure Description

1-18

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, I/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:

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

BAZ23 Enclosure Maintenance

Add up the columns. Make sure the totals are within the limiis for the

enclosure.

NOTE: Ch/ck the appropriate CPU documentation to determine which
oplions arc s.pported.

Table 1-5. Power, Bus Load, and /O Insert Data
Current

(Amps)

Power

Bus Loads

Option

Module

+5V

+12V

Watts

Insert!

AAV11-D?
ADV11-D?

A1009
A1008

1.8
32

0.0
0.0

9.0
16.0

10
1.0

1.0
1.0

CXA16-M

M3118-YA

1.6

0.2

10.4

3.0

0.5

CXBl16-M

M3118-YB

2.0

0.0

10.¢

3.0

0.5

CXY08-M

M3119-YA

1.64

0.395

12.94

3.2

DEQNA

M7504

0.5

235

0.5

DELQA

M7516

2.7

19.5

2.2

0.5

DFAO1

M3121-PA

197

0.40

14.7

3.9

1.0

DHVI11

M3104

0.55

29.1

2.9

DLVEI-DP

M8017

1.0

1.5

23.0

1.6

1.0

DLVJ1

M8043

1.0

0.25

1.0

DMV11-M

M8053

218

2.0

i.0

DMV11-AP

M8053-MA

0.38

216

2.0

1.0

DMV1i-BP

M8053-MA

0.38

216

2.0

1.0

DMV11-CP

M8064-MA

335

0.26

199

2.0

1.0

DMVI11-FP

MB8053-MA

3.4

0.38

21.6

2.0

1.0

DMVI11-N

MB064

0.4

21.8

2.0

1.0

DPVI11

MB020

1.2

9.6

1.0

DRV11

M7941

0.9

0.0

2.8

1.0

A2)

DRV1I-BP

M7950

1.9

0.0

1.0

A2)

puvn-pp

M7951

1.2

0.39

10.7

3.0

1.0

A2)

DRV11-J

M8049

1.8

0.0

9.0

2.0

1.0

DZQ11

M3106

1.0

0.36

9.32

1.5

1.0

DZV11

M7957

1.2

0.39

10.7

3.9

1.0

IEQ11

M8634

3.0

0.0

15.0

2.0

1.0

1A=25cmx 100 cm (] in x 4 in).
B=50emx7.5cm(2inx
3 in).

2Usually connected through a universal data input panel (UDIP), using a 13.13-cm (5.25in) mass storage slot.

BA23 Enclosiire Description

1-21

Table 1-9 (Cont.):

Power, Bus Load, and l/O Insert Data
Current

(Amps)

Power

Bus Loads

Option

Module

+5V

+12V

Watts

Insert'

KAG20-AA

M7478

6.2

0.14

32.7

1.0

KAG30-AA

M7606

6.2

0.14

32.7

2.7

1.0

KA650-AA

M7620-A

6.0

0.14

31.7

2.7

1.0

KDA50-Q*

M7164

6.93

0.0

34.65

3.0

0.5

M7165%

6.57

0.03

33.21

KDA50-Q

M71654

4.07

0.03

20.71

KDF11-BE

M8189

0.1

28.7

KDJ11-BC

M&190

0.1

287

2.3

1.1

KDJ11-BF

L4190

0.2

299

1.0

KLES1

M7740

3.0

0.0

15.0

1.0

KMV11

M7500

2.6

0.2

15.4

3.0

1.0

KWvi1-C?

M4002

0.013

112

1.0

LPVI1

M8027

0.8

0.0

KDA50-Q

Cor D rev

E rev

MRV11-D”?

M7942

1.6

0.0

8.0

3.0

0.5

MRV11-D

M7942

0.0

14.0

1.8

1.0

0.0

26.5

0.0

MS630-AA

M9060-YA
M7607

1.0

0.0

5.0

0.0

MS630-BA

M7608

0.0

MS630-BB

M7608

1.8

0.0

MS630-CA

M7609

3.1

15.5

0.0

MS650-AA

M7621-A

2.7

0.0

13.5

0.0

MSV11-JD

M8637-D

3.74

0.0

187

2.7

0.5

MSV11JE

M8637-E

4.1

0.0

205

MSV11-PK

MB067-K

3.45

0.0

17.25

2.0

1.0

MSV1i-PL

M8067-L

3.6

0.0

175

2.0

1.0

MSVI1I-QA

M7551-AA

0.0

12.0

2.0

1.0

1A=25cmx 100
cem
(1inx
4 in).
B=50cmx75cm(2inx
3 in)

2Usually connected through a universal data input panel (UDIP), using a 13.13-em (5.25in) mass storage siot.

SKDA50-Q is a two-module set (M7164/M7165).
ta} for both modules.

AC and DC bus loads listed = to-

4The etch revision letter C, D, or E is part of the module part number near the handle. For example, a part number xxxxx~Ex-xx is a revision E module.

5Unpopulated meodule.

1-22

BA23 Enclosure Maintenance

Table 1-9 (Cont.):

Current
(Amps)

Option

Power, Bus Load, and l/O insert Data

Module

Power

Bus Loads

+5V

+12V

Watts

Insert!

RA70

3.3

51.3

RC25

1.0

2.5

35.0

RD31

0.9

38.8

RD32

0.9

0.6

33.0

RD33

1.0

15.7

RD51

1.0

1.6

242

RD52

1.0

35.0

RD&3

2.5

34.5

RD54

1.3

1.34

23.7

RD54A-EA

1.3

1.34

226

RLV12-AP

Mso61

5.0

0.10

26.2

1.0

RQDXI1

M8639-YA

0.25

35.0

2.0

1.0

RQDX2

M8639-YB

6.4

0.1

33.2

1.0

RQDX3

M7555

2.48

0.66

13.2

1.0

RQDXE

M7513

0.5

0.0

1.0

RX33

0.5

0.3

5.6

RX50

0.85

1.35

1.8

2.4

259

TK50-AA

1.35

34.5

TKS0E-EA

1.35

35.6

TK50
TK70E-EA

TQK25-KA

M7605

33.55

1.5

2.4

36.3

4.0

20.0

1.0

TQKS50

M7546

0.0

14.5

2.8

TSVO05

M7196

6.5

0.0

325

3.0

1.0

vCBO1

M7602

1.5

42.0

3.0

1.0

VCBo02

M7169

5.8

0.75

38.0

3.5

1.0

VCB02

M7168

0.0

170

0.0

1A-25emx 100 em (1in x 4 in).
B=50cmx75cm2inx 3 in).

BA23 Enclosure Description

1-23

Figure 1-14:

BA23 Configuration V/ork heet

ADD THESE COLUMNS
w

N
BACKPLANE
SLOT

MODULE

CURRENT (A)
+5V

+12V

36.0

7.0

N
POWcR

/O INSERTS

2°

1 AB

cD
2 AB
Cco

3 AB
co

4 AB
Cco

5 AB
Cco

6 AB
co
7 AB

CcD
8 AB
cD
MASS

STORAGE
1

COLUMN
TOTALS:
MUST NOT

EXCEED:

230

*IF MORE THAN TWO TYPE A CONNECTORS ARE REQUIRED,
AN ADAPTER TEMPLATE (PN 74-27740-01) MAY BE USED. THIS
ALLOWS THREE ADDITIONAL TYPE A CONNECTORS BUT REDUCES
THE AVAILABLE TYPE B CUTOUTS TO TWO.

i-24 BA23 Enclosure Maintenance

MLO-000207

‘

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 (102 lb). The pedestal weighs 31.7 kg (70 lb); the tabletop weighs 29.5 kg
(65 1lb).

Ins.allation

2-1

Flgure 2-1:

BA23 Enclosure Dimensions

107.31 ¢cm

(42.25 :n)
\\

546 cm

(215 i)

.
;

44.4cm

“

(1756 in)

15.2¢cm

(6 )

~—m

726 cm

(286in)

7126 cm

"""

ng~ (286 1n)
64.2cm
(24.5 1)

TABLETOP

23.5 kg (65 ib)

56.2 cm

22.13 1)

PEDESTAL

31.75k9(701b)

\/ {10 n)
\

TABLETQP

CONVERSION

2-2

BAZ3 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

The BA23 system operating acoustic emission levels are as follows! :
LNPE (8)2 = 6.1
LPA (dB)?® = 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 40%.

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 10-1985 and ISO/DIS 7779. Levels may be
lower, depending on the kind and number of mass storage devices in the system.
LNPE = Noise power emission level (A-weighted sound power level) measured in bels re 1
pWw.

LPA = Sound pressure measured in decibels at 1.0 m from the front edge of the unit and
1.5 m above the tloor.

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,

'{umidity Ranges, ard Alti-

tude Limits
Parameter

Range

Temperature

Operating:!

10°C to 40°C

50°F to 104°F

Neonoperating:

-40°C to 60°C

Temperature rate of change

Operating:

11°C per hour maximum

Relative humidity

Operating:

20% to 80% (noncondensing)

Nonoperating:

10% to 95%

Operating:

2440 m (8000 ft)

Nonoperating:

4900 m (16,600 ft)

Maximum altitude

-40F to 140°F

19.8°F per hour maximum

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

2.1.8 Electrical Requirements
The power scurce should be adequate to handle the original cystem and
allow for sys:2m 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

BAZ23 Enclosure Maintenance

Table 2-2:

240 V Power Cords

Power Cord Number

Countries

BNO02A-2E

United Kingdom and Ireland

BNO3A-2E

Austria, Belgium, Czechoslo sakia, Finland, France,
Germany, Hungary. Netherlands, Norway, Paland, Portugal. Spain, and Sweden

BNO2A-2E

Switzerland

BNOBA-ZE

Australia and New Zealand

BNO6A-2E

Denmark

BNO7A-2E

Italy

Table 2-3:

BA23 Electrical Requirements

Nominal ac Voltage —

100 Vac

120 Vac

220-240 Vac

Valiage range

90-110 Vac

104-128 Vac

191-256 Vac

Power source phase

Single

Nominal frequency

50-60 Hz

Maximum steady state
current at nominal voltage

53 A

44 A

22A

Maximum steady state

55A

27A

Maximum inrush current

100 A

Maximum power consumption

345 W

Frequency range

47-63 Hz

4763 Hz

current at minimum voltage

2.2 Unpacking the Shipment
To unnuck a BA23 enclosure system, follow the steps on the installation
sheet - .ched to the shipping container. Figure 2-2 shows the contents of
the sii.¢,.inyg carton.

installation

2-8

Figure 2-2:

Shipping Carton Contents

33|

svsTem uniT

GRANT CONTINUITY
MODULE
PLUS FILLER STRIP
REQUIRED FOR TABLETOP
INSTALLATION

POWER CABLE
WMLO-000208

The shipment may include some of the following equipment:
Additional terminai(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 mouant version
are in Section 2.5.

2-§

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.
After unpacking the system, use two people to move the unit to the
determined location. The unit weighs 27 kg (60 1b).

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

2 Turn off the console terminal.

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

4. 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 Congole Terminal (Exampie)

/ TO CONSOLE TERMINAL

.0-000211

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 cornnect them to the system.
You can connect up to eight terminals and/or printers for each DHQ11 and
DHV11 module, and up to four for each DZQ11 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

After making connections, thread all cables through the lower cabl. guide
(Figure 2-5).

You connect modem lines to the I/O panels the same way you connect
terminals and printers. The DHQ11, DHV11, and DZQ11 modules have
modem control support.

Cor:nect 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 coanected 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:

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 Ceable

2 Connect the other end of the cable to one of the following devices:
e An H4000 transceiver located on a traditional baseband Ethernet
cable.

ected to a baseband Ethernet
e A DELNI, which can, in tumn, be conneight
systems in a local area
cable or which can connect up to
network (LAN).

e A DESTA converter, if you need to connect to a ThinWire network.
2.3.6 Setiing Controls on the System
Controls on the system are in four locations:

The CPU VO insert on the rear of the system
e The voltage switch on the rear of the system
e The circuit breaker on the rear of the system
e The control panel on the front of the system

Installation

2-11

2.3.6.1 Boot Select (MicroPDP-11/53 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-11/53 only)
| MicroPDP-11/83
MODIFIED
MODULAR
JACK \

LED
DISPLAY
i

B Baud Rate
0- 300
1 -600

2- 1200
32400
F - 4800
5 - 9600
6 -

N4
2

38400
-

BAUD RATE
SELECT SWITCHES

BOOT SELECT
SWITCH
MLO-000214
MA-1011.00

2.3.6.2 Setting the Baud Rate (MicroPDP-11)

The baud rate select switch(es) for the system is on the CPU V/O incert
(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) or
use a pencil to set the switches in the switchpack. The system and the
terminal must he set to the same baud rate.

2-.12

BA23 Enclosure Maintenance

Figure 2-3 Setting the Baud Rate (MicroPDP-11)
LED

DISPLAY

thieroPDP-11/03

CONSOLE \\

SWITCHPACK CONTROL

TEMINAL

CUNNECTOR

COUBOLE

SW1

Dreabrar

OIF!F

Dicabled

ROt MODE

BOOT DEVICE
Devi_e

sw2

SELECT swiTcu
sW4e

Dovieo 2

OFf

Dovice 4

OFF

Dovico 5
Dovieo 6

DIALOG

OFF
OFF

OFF

ON
OFF

OFF

ticroPDP.

11/

1172 l

Devico 3

(eroPDP.

OFF

OFF
ON

NOBRLIN

. BAUD RATE
SELECT SWITCH

BAUD RATE

swW3

;

|9‘3,9f° °‘°l°'

anve

ticroPDP-11/83. MicroPDP-11/73

[13-4
0

CONSOLE
TEMINAL

CONNECTOR
\

;

olfts

sWs

;gg;;:;g ®

Enablec
Dissbied

ON
OFF

8°°°:°

Sit-:
wllse

BAUD RATE

swe

38.400

18,200
2600

4800

2400
1200
800

300

sw?

swe

OFF

OFF
OFF

oM
ON
OFF

ON
OFEF
[« 1)

OFF

z
©

2rom=c®®
=~

D NB WO
-

Rec82as8s
gooooooc

24
(N
mil=.

~ [k, ¥

5]
@

/
BAUD RATE
SELECT SWITCH
144-0873-00.DO

Installation

2-13

2.3.6.2 Setting Controis on the CPU I/O Insert (MicroVAX)
The following controis are located on the CPU /O insert (Figure 2-9}):
CPU I/O insert Controls (MicroVAX)

HALT

POWER-Up

g‘:gE

surdt ———

SWITCH

MODE

ENABLE DISABLE

SWiTCH

SWITCH

opBy

Figure 2-9:

;

LE B .
1

CONSOLE

TERMINAL

CONNECTOR

LED

DiSPLAY

MLO-000216

Halt enable/disable switch. The factory position is halt disable (left),
indicated by the d. 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, roiate the baud rate switch to 9600. The system and the
console terminal must be set to the same baud rate.

2-14

BA23 tnclosure Maintenance

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

1Sy
IN NORTH AMERICA,
THE SWITCH IS SET
TONsvV.

-~ VOLTAGE SWITCH

{

READ AND

REMOVE
CAUTION

280 V/230 V/260 V
IN OTHER COUNTRIES,
THE SWITCH IS SET TO

230 v IF NOT, LOOSEN
SCREWS, AND SLIDE
SWITCH TO 230 v

I SCREWS

MLO-000217

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

CIRCUIT

BREAKER

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:
L.

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
i

outlet.

1ect 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

6. 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.

7. 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

2.4 Instaliing 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

2-18 BA23 Enclosure Maintenance

‘

Figure 2-14:

Removing the Base Screws

JJJJJJ

MLO-000221

Follow the air circulation guidelines for the BA23 pedestal version in
Section 2.3.1. Lift the system from the footstand and place it on a table.
WARNING: Use two people to move the system. The system weighs 29.5
kg (65 Ib).

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

Figure 2-15:

Completing the Tabletop Contiguration
SNAP ON FILLER STRIP HERE

To complete the tabletop installation, use the same procedures as in the
BA23 pedestal version, Secticns 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:
e

45.2 cm (19 in) wide

63.5 cm (25 in) between vertical rails

2-20

BA23 Enclosure Maintenance

BA23 Rack Mount Version

CUSTOMER-

SUPPLIED

(/%

RACK

Figure 2-16:

WARNING: Use two people to install the rack mount system. The system
weighs 29.5 kg (65 1b).

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.

Instaliation

2~21

Figure 2-17:

BA23-AR
Rack Mount Kit Contents

RAILS (RIGHT, LEFT)

(1 EACH)

FRONT COVER

LEFT_ 7428371 02
RIGHT 7428371 01

RIGHT REAR BRACKET
7428372 02

(]

LEFT REAR BRACKET
7428372 01

STOP PLATE

742870

RIGHT FRONT BRACKET
7021543 0!

LEFT FRONT BRACKET

3 )]

7430071

O <yet7\o NvLoNSTOP CABLE (1)
o

PHILLIPS MACHINE SCREWS

WITH LOCK WASHERS
FLAT HEAD PHILLIPS

an O

& PHILLIPS SCREW WITH

LOCK WASHER

@
4

12
.0-000224

2. 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

MLO-000225

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
80TTOM

RIGHT REAR
RAIL

FINGER
()
TIGHTEN

SCREWS

FINGER

fi TIGHTEN
SCREWS

LEF- 2EAR !

BRACKET

LEFT REAR RAIL
MLO-000226

2-24

BA23 Enclosure Maintenance

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

Figure 2-20:

Preparing the Rack
SLIDE U NUTS
INTO PLACE

LEFT REAR RACK

S o O

OO0 0,

g
e
LEFT FRONT RACK

ML0-000227

instaliation

2-2%

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

Flgure 2-21:

Mounting the Left Rail

LEFT REAR
RAIL

ot LEFT FRONT
RACK

LEFT REAR RACK
POSITION PREPARED RAIL

AND TIGHTEN ALL SCREWS

Repeat steps 4 and 5 to mount the right rail.

Tighten all screws.

#.0-000228

Refer to Figure 2-22 for steps 8 through 11.

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 Piate and Brackets

§TOP PLATE

ATTACH STOP PLATE

ATTACH FASTENERS
AND SECURE FRONT

BRACKETS 70 THE
uNIT

RIGHT FRONT
BRACKET

LEFT FRONT BRACKET AND FASTENERS

V1.0-000219

instaliation

2-27

Figure 2-23:

Attaching the Stop Cable

LEFT REAR RACK

NYLON STOP CABLE

SLIDE UNIT IN PLACE AND
SECURE NYLON CABLE AS SHOWN

ML 0000230

2-28

BAZ23 Enclosure Maintenance

13. Mount the
Figure 2-24:

‘If-tap screws on the front cover (Figure 2-24).
Ereparing the Front Cover

NLO-0DD231

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

Attaching the Front Cover

PRESS FIRMLY IN PLACE
MRO-000232

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.

installation

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 a: seen from the front of the enclosure.
CAUTION:
*

Only qualified service personnel should remouve or install FRUs.

DBefore you remove or install FRUs, power down the system and remove

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
Power supply!
H7864
H7864A

H7864B

Part Number
30~-20444-00
30-21749-01

H7364B

AC power switch with cable to power supply

70-20434-01

Adapter plate

74-28684--01

Backplane assembly

70-19986-00

Backplane dc power cable

17-01311-01

Battery pack for CPU IO insert

12-19245-01

Control panel

70-22007-01

Control panel cable

70-20451-1C

CPU /O insert

54-16744-01

DC fan (front or rear)

12-17556-01

DC fan power cable

70-20449-00

Front cover (ficor/table)

74-27559-01

Front cover irackmount)

74~27561-01

Grant card

MS047

VO panel

70~-19979-00

LED cable 120-pin)

17-00712-02

Loopback connectors

12-15336~00

MicroVAX memory interconnect cabie

17-00716-01

Pedestal 'base)

74-27012-0

Pedestal (enclosure)

70-20468-01

@22-bus backplane

H9278-A

RD50-series signal cable (20-wire)

17-00282-00

RDS50-aeries signal cable (34-wire)

17-00286-00

Rackmount kit

70-22025-01

Rear cover

74-27560~-01

RX/RD power cable

17-01356-02

RX50 signal cable

17-00285-02

Signal distribution pansl

54~15833-00

SLU cable (10-pin)

17-0082¢-01

TK50-t0-TQK3S) interconnect cable

70-22313-0i

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

3-2 BAZ3 Enclosure Maintenance

‘

Figure 3-1:

BA23 Enciosure FRUs

NOTES:
1.
CONNECTORS J1 AND J2 ARE LOCATED ON THE
BACKPLANE (H8278-A) ASSEMBLY.

VIEW A-A
2 PLACES

1F DISK DRIVE 1S NOT PRESENT, THE POWER CABLE
CONNECTOR SHOULD BE PLUGGED INTO J3 ON THE
DISTRIBUTION PANEL.
IFDISK DRIVE 1S NOT PRESENT. THE POWER CABLE
CONNECTOR SHOULD BE PLUGGED INTO J4 ON THE
DISTRIBUTION PANEL.
THE REAR FAN CABLE 15 AN INTEGRAL PART OF

THE :47684 POWER SUPPLY.

psoip

THIS CABLE IS AN INTEGRAL PART OF THE
7020095-01 ASSEMBLY.

POWER SUPPLY UNIT SEE NOTE

3020444-00 OR
3021749-01 OR
H7864B

BACKPLANE ASSEMBLTM HB278-A \ "
BACKPLANE

7019886-00

msee |

NOTE3 \

TS5

170282-00

170286-00

sasee

NOTE2

110

)

FRONT FAN

1217556-01

17.01356-02
SEE NOTE 3

)

7020449-00
1700285-02

7020451.1C

SEE NOTE 5

SEE

NOTE 2

3, e

RX OR TK

(RX50 SHOWN)

FRONT CONTROL

PANEL

70220C7-01
#.0-000233

FRU Removal and Replacement

3-3

3.2 Modules
CAUTION:

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

Dual-height modules: Ifyou use dual-height Q22-bus modules in slots
2 or 3 of the BA23 backplane, you inust 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 slotz 2 and 3.

Ifyou install a dual-height module in slots 4 through 8, you must install:
(1) a grant contiisuity card (M9407) in rows A or C of the same slot, or
(2) a second duc;-height module in the same slot.
Use the following procedure to remove modules from the BA23 enclosure

(Figure 3-2):

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 I/O panel in place.
assembly open and remove the ground strap screws.

Swing the

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

3-4

BA23 Enclosure Maintenance

Figure 3-2:

Removing Modules

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

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:

Make sure you correctly set any jumners and switches on a new
moduie. 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 € of the removal procedure.

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

3-6

BAZ23 Enclosure Maintenance

‘

’

3.3 Control Panel

Remeve the contrs! pane! z& 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.

Remove the front retaining bracket.

Push the BA23 frame forward.

FRU Removal and Replacement

3-7

Figure 3-4:

Accessing the Control Panel

llmfl

u
\ u\\
ififlt %

3-8

BA23 Enclosure Maintenance

\\\\ =] M)

2@
o
®

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 foliows:
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

Turn 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.
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

& = @ :S &2 og 2E

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

Static electricity can damage integrated circuits. Use the wrist strap
and entistatic ma: found in the Antistatic Kit when working with mass
storage deuices.

Handle any fived-disk drive with care. Dropping or bumping the drive
can damage the disk surface.
1.

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.

SF‘l!%eLMicmsyflem Options for procedures on removing mass storage device
’s.

=12

BA23 Enclosure Mainienance

Figure 3-6:

Removing a Disk Drive (Example)

MLO-000228

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

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 (Exampie)

FRONT OF DRIVE

0S'

DS2

[ld

|ld

lll
'ps3

DS4

REAR OF DRIVE

MLO-000239

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:

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

’

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

Fizure 3-8:

Removing the Access Door

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 cable(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 Remova! and Replacement

3-15

3.5 CPU /0 Insert
Remove the CPU /O insert as follows (refer to Figure 3-9 for steps 1
through 5).
1.

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

Note the orientation of the red stripe on eacl: internal cable connected
to the CPU /O insert. Disconnect the cables from the CPU I/0 insert.
Remove the screws that hold the CPU /O insert to the 1/0 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 /O Insert

FRU Removal and Replacement

3-17

3.6 Backplane Assembly
Remove the backplane assembly as follow.. (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
3.

Remove the front and rear covers. Disconnect and label all cables.
Remove the rear retaining brackei and slide the BA22 frame completely
out.

Remove both the storage cover and the logic cover.
On oider 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
N

tws tavs.

BA23 Enclosure Maintenance

Figure 3-10:

Removing the Retaining Bracket and Covers

Open the rear I/O 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

3-18

®
N

On some systems, remove the baffle from the front fan.
Remove any mass storage devices. See Section 3.4.

Note the location of all modules, then remove them.

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

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

Accessing the Backpiane

hoh Ve

Figure 3-11:

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:

Removing the Backplane Screws

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

3.7 Pow~r 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):

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.

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

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

fan.

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

Disconnect the front fan's power cable from J10 on the power supply.
Disconnect the control panel's power cable from J7. Both connectors
are keyed and have a locking assembly.
7.

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

3-24

BA23 Enclosure Maintenance

Figure 3-14:

Power Supply Cables

FRU Removal and Replacement

3-25

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

8. 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:

3-26

Removing the Power Supply

BAZ23 Enclosure Maintenance

‘

Instaliation

’

Install the power supply as follows:
1.

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 keved. Make sure the curve of
the connector matches the curve of the fan housing (Figure 3-16).
Figure 3—16:

Fan Housing Connection

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

FRU Removal and Replacement

3-27

Figure 3-17:

Rear Fan Cable Position

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.

3-38 BA23 Enclosure Maintenance

Figure 3-18: Removing the Rear Fen

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. Masake sure
the cross members of the fan guard face the inside of the unit, as shown.
Place the spacers on the screws.

2. 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.

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

FRU Removal and Replacement 3-29

Figure 3-19:

Installing the Rea: Fan

3.9 Front Fan
Remove the front fan as follows:
1.

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.

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.
6.

Disconnect the front fan power cord trom J10 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

OLDER SYSTEMS ONLY

MLO-000252

Figure 3-2i:

Removing the Front Fan

FAN
GUARD

SCREWS (4)
AND

SPACERS (4)

MLO-000253

Installation

Install the front fan as follows:

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 #igure 3-20,
step 5.

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.

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.

332

BA23 Enclosure Maintenance

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

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

Disconnect the BBU cable from the CPU I/O insert (Figure 3-22).

I/0 insert.

Figure 3-22:

Disconnecting the Battery Backup Unit

MLO-000254

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-G00255

3-34

BA23 Enclosure Maintenance

Appendix A

BA23 System Interconnection Pinouts
Figure A-1 shows the system interconnection pinouts for the BA23
enclosure.

BA23 System Interconnection Pinouts

A-1

Figure A-1:

BA23 Svetem Interconnection Pinouts
L

eovcwar
i

-un:;':«:.

WaT

[i 8]

30 M 37 39 4) 48 47 ARD €S ARG
188278
S
GATND
s

.
‘=
Y LA

‘0

Fid

TRACE ooy

WY BT 0L

Wsomon,

WEAD BEL 1 1L

0|
2

Oy 881 3 i)

Offy SEL & 1)

7019538-00

PARE

AT
TV

MR RD DATD ()

=8AD S8 O 1Ly

Ofv
§4 ¢ &CK ()
kY W €D L |

0 [~ a0 Data s

REALY L/

Ry 00w
3
4w aATE
00 T a AT (oA
1L,
»
STRP 1L,
%
oaechon
L,
3
S wOTOR Gl
3
T
Wt i
T
N

it
e
2:
:.

ROON

wes 3P va

[

TUM

‘e

SEAD SIL O5Ly

BTN

DER )

2
20

SA0Y L
STEP 1)

a2
20

o
o

.1 TRY
DRV S84 2 111

i
"

TMS

kD DATGRn |

AR MePYG KON

ROO KOviH)
T %x0 wer i

WEAD SEL 1L

WYY FRLH iy

RO ROViM:

HEAD SEL 2u!

GHEW WAT DT

‘[

waror

SRE NOTE '

AL CNTRDLS ORLY | HAJD OI3K 1§ SUPFORTED W Twrk BAZ3

190 CABLE FOR Tiol REAR RN 1§ AN WITIGASL AT OF Toog

SOWER SUPFLY AR2EMBLY

?
-

SEEECAY LTRSS

)

5 AN

121795800

468078
7

,
)

o :!

FRONY Fan

121185801

»& v
43

SRE NOTE S

ROWER SUPRLY
3021 1900
boa

6k WOTE 2

12 vk

woTE e

00y 8t ACR 1L

+8vOC

8 V0T
T8 vOC

—_

v VI

"2
"

GND

SR
[

Wwwatorim

e WY 0T 1y s
n

mummy

nl_
'2

'8
.

I
2
iy

ORv S

SEL iy

S GATE)
T

10 | HENOTEE

m&)

)

CRONT PRMEL

02000800

AUD WRT PRO

.
.

& BT i)
'3

S Mt
by

val

ettt St

D
P

WBY LED
L

K.
3

BXO WY L ED (.
Ax

3 .

[

xey

)

ATt ADY w4

RD! WAT PRG

‘

+8 vt

RE2 WPT LED
L

REIWPT LED

& DCOR
%)

BA23 Enclosure Maintenance

sacnmang

02764

.
9

]

3 4867800
gv

' 2

SEE MOTE &

I V0L

NOT USED

;
sowtn "TY

’

P—“T "

wEAD 36L 011y
-

20 rml
e
T

Wtandeanivaomdl
I
|

_feADDataw,

[ LTV
BTV

S0Cx 1

$ 32 80

10|

AND S

°
'

]

.
0

LTIV

WOER (L)
DWW

KX WOTOR
(L)

. T
3)

P
2

Lt nave s

\P]

& L)

ooV ShL 2 i

——— - ——

REDUC WRT 1 1

GND

]

. “:IIW:J =
-

‘8

ROC KDY

A~2

DUL TO MBUFKCHENT FONER SUPRY CARCITY AND 10 HROMNT

S4E NOTE §

OWRCTION (L1

ORv SEL 8 L.

B -

‘0

vy]

.[S

M TR

13T 192 2328 17 28 3 AND XIANE

[

s A DATON,

MDD

[rar)

SEER CPLY (1)

)

]

TIRACK B0 o

TR
A0 VAT BRQ (L ;
ORI)

’

MBI 3809

GROUND Pees

Ofv 381 21

R Gwaar]
1 A RD DAY it

WOT GATE 111

e BT
'

SEE NOTE 3

REOUC WAT 1 1y

”
13

MM
D GATO i)

13181719 2120282720 3

WA W 070 |

R8T

MBI A6 8 V12 '8 18 10 AND 70 AAE GROURD
PN

1 ftiavED
Y FUSES
. E——
[y S
-

DET Aiely

46 wOTE 2

]

Oy SOMKi

(!
QERBCTION

$ THECARL S ORIGRLATING O THE POWER SUPOLY AT 28 BRLITS INTO
TWO CARLES. GNE FOR EACH OF Toef TWO FOBGISLE DRVES

B—wwmin

L
2

OV SEL T

eAgY

«§ vOC

HOGCOOOKINNOK

XHIRONOOOKK

JODOOARAAKRAHKIONON
XOON0OGOGGODTCON0E
0000000000000
XICO0OXX
00N
THI0H0N
000
E

X000000000000ONNNNGIXKINK
ROONCN0000000NNNN00N0NNK
'!!-"-"'-zn‘--‘-----..En--l-

--lx

Appendix B

Related Douumentation
The following documents contain information relating to MicroVA®: or
MicrePDP-11 systems.
Document Title

Order Number

Modules

CXA16 Technical Manual

EK-CAB16-TM

CXYO08 Technical Manual

EK-CXY08-TM

DEQNA Ethernet User’s Guide

EK-DEQNA-UG

DHV11 Technical Manual

EK-DHV11-TM

DLV11-J User’s Guide
DMV1i1 Synchronous Controller Technical Manual

EK-DLV1J-UG
EK-DMV11-TM

DMV11 Synchronous Controller User's Guide

EK-DMV11-UG

DPV11 Synchronous Controller Technical Manual

EK-DPV11-TM

DPV11 Synchronous Controller User’s Guide

EK-DPV11-UG

DRV11-J Interface User’s Manual
DRV11-WA General Purpose DMA User’s Guide

EK-DRV1J-UG
EK-DRVWA-UG

DZQ11 Asynchronous Multiplexer Technical Manual

EK-DZ2Q11-TM

DZQ11 Asynchronous Multiplexer User’s Guide

EK-DZQ11-UG

DZV11 Asynchronous Multiplexer Technical Manual

EK-DZV11-TM

DZV11 Asynchronous Multiplexer User's Guide

EK-DZV11-UG

IEU11-A/IEQ11-A User’s Guide

EK-IEUQ1-UG

KA630-AA CPU Module User’s Guide

EK-KA630-UG

KA640-AA CPU Module User’s Guide

EK~KA640-UG

KA650--AA CFU Module User’s Guide
KDA50-Q CPU Module User’s Guide

EK~-KA650-UG
EK-KDA5SQ-UG

KDJ11-B CPU Module Usger’s Guide

EK~-KDJ1B-UG

KDJ11-D/S CPU Module User’s Guide

EK-KDJ1D-UG

KDF11-BA User’s Guide

EK-KDFEB-UG