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EK-188AA-MG-1

October 1988

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Document:	BA123 Enclosure Maintenance
Order Number:	EK-188AA-MG
Revision:	1
Pages:	86
Original Filename:	micropdp11-volume_2_enclosures-EK-188AA-MG-001.pdf

OCR Text

BA 123 Enclosure Maintenance
Order Number EK-188AA-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 b~ Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that may appear
this document.

.
IJ1

The software. if any, described in this document is furnished under a licenf'e and may be used
or copied only in accordance with the terms of such license. ~o responsibility is assumed
for the use or reliability of f'oftware or equipment that is not supplied by Di"rital Equipment
Corporation or it:; affiliated companies.
D Digital Equipment Corporation. 19i1il. All righb reserved.
Printed in U.S.A.
The READERS C01\1.\1E1\TS form on the last page of this document requests the user's
critical evaluation to assist in preparing future documentation.
The following are trademarks of Digital Equipment Corporation:
DEC
DECmate
DECnet
DECeS
DEC writer
DEL"JI
DEQ:\A
DESTA
DlBOL
}lASSBC8
:\1icroPDP-ll

:\1icroVA.•X
l\Iicro V:\IS
PDP

FOS
Professional
Q-blL'
Rainbow
RSTS
..
R ,SX'
RT
Thin Wire

CLTRIX
l':\IBC8
VAX
VAXBI
VAXEU\
VAXcl uster
VAXstat ion
\,:\18
VT
\\'ork P),(lcessor

OmD .

ML-S976
Tbe equipment described in this manual generates, uses. and ma~ emit
radio frequency enerb'Y. The equipment bas been type tested and found to comply with the
limib for a Class A computing device pur,uant to Subpart .J of Part l.~ of FCC Rules, which
are desibrned to provide reasonable protection against sucb radio frequency interference when
operated in a commercial environment. Operation of tbis equipment in a re;.;idential area
may cause interference, in which case tbe user at his own expense may be required to take
measures to correct the interference.

FCC NOTICE:

Contents
Preface
Chapter 1
1.1
1.2
1.3
1.4
1.5
1. 6
1.7
1.8
1.8.1
1.8.2

• •

Vll

BA 123 Enclosure Description

Mass Storage Device Areas .. . . . . . . . . . . . . . . . . . . . . . . . .
Backplane... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Distribution Board ...........................
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
I/O Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Air Circulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Configuration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Module Order and Configuration. . . . . . . . . . . . . . . . . . ..
Configuration Worksheet • • •
• • •
• • • • • • •
• •
• •
•

1-1
1-3
1-5
1-8
1-11
1-14
1-16
1-18
1-18
1-19

2.1
Preparing the Site ................................ .
·
.
2.1.1
D ImenSlons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2
Addi tional Equi pmen t . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3
Acoustics . .................................... .
2.1.4
Operating Environment .......................... .
2.1.5
Static Electricity ............................... .
2.1.6
Heat Dissipation ............................... .
2.1. 7
Environmental Specifications ...................... .
2.1.8
Electrical Requirements .......................... .
2.2
Unpacking the Shipment. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3
Installing the BA123 System ........................ .

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

Chapter 2

•

Installation

•••

III

Chapter 3
3.1
3.2
3.2.1
3.2.2
3.2.3
3.3
3.4
3.5
3.6
3.7
3.7.1
3.7.2
3.8
3.9
3.10
3.11
3.12
3.13

FRU Removal and Replacement

FRUs • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Accessing FRU s .................................. .
Right Side Panel ............................... .
Left Side Panel ................................ .
Top Cover . . . . . . . . . . . . . . . . . . . . . . . . ............. .
Modules... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On/Off Switch ....................................
CPU Console Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Mass Storage Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Fans ............................................
Mass Storage Fan ...............................
Card Cage Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
Door Interlock Switch ..............................
Temperature Sensor Board. . . . . . . . . . . . . . . . . . . . . . . . . ..
Backplane .......................................
CPU I/O Insert. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
MicroVAX Battery Backup Unit (BBU)
• • • • • • • • • • •
• • •
•

•

Appendix A

•

3-1
3-3

3-4
3-6
3-8
3-9
3-11
3-11
3-13
3-13
3-13
3-15
3-17
3-19
3-21
3-21
3-23
3-23

Related Documentation

Index
Figures
1-1
1-2

1-3
1-4
1-5
1-6
1-7
1-8

BA123 Enclosure • • • • • • • • • • • • • • • • • • • •
1-1
• • • • • • • • • • •
BA123 Mass Storage Slots .......................... . 1-2
BA123 Backplane Grant Continuity and Jumpers ........ . 1-3
BA123 Signal Distribution Board (M9058) .............. . 1-5
BA123 Signal Distribution Board Cabling .............. . 1-7
BA123 Power Supply .............................. . 1-8
BA123 Power Supply Controls and Connectors (Rear View) . 1-10
BA123 Control Panel .............................. . 1-11
•

•

IV
~

•

1-9
1-10
1-11
1-12
1-13
2-1
2-2
2-3
2-4

BA123 CPU Console Board ..........................
BA123 VO Panel ..................................
BA123 Adapter Plate and Filtered Connectors .......... "
BA123 Temperature Sensor Board .................... .
BA123 Configuration Worksheet '" .................. .
BA123 Enclosure Dimensions ....................... .
Opening the Rear Door ............................ .
BA123 CPU VO Inserts . . . . . . . . . . . . . . . . . . . . . . ...... .
Connecting the Console Terminal to the CPU VO Insert
(Example) ...................................... "
2-5 Connecting External Devices . . . . . . . . . . . . . . . . . . . . . . . ..
2-6 Checking the Voltage Setting. . . . . . . . . . . . . . . . . . . . . . . ..
2-7 Attaching the Power Cord ......................... "
3-1 BA123 FRUs .....................................
3-2 Removing the Right Side Panel ..................... "
3-3 Removing the Right Inner Panel . . . . . . . . . . . . . . . . . . . . . .
3-4 Removing the Left Side Panel . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Removing the Inner Left Panel .. . . . . . . . . . . ......... "
3-6 Removing Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "
3-7 Removing the On/Off Switch . . . . . . . . . . . . . . . . . . . . . . . ..
3-8 Removing the CPU Console Board. . . . . . . . . . . . . . . . . . . ..
3-9 Removing the Mass Storage Fan . . . . . . . . . . . . . . . . . . . . "
3-10 Removing the Card Cage Fan (Older Systems) ...........
3-11 Removing the Power Supply .........................
3-12 Door Interlock Switch and Temperature Sensor Connection .
3-13 Removing the Backplane .......................... "
3-14 Disconnecting the Battery Backup Unit Cable .......... "
3-15 Removing the Battery Backup Unit .................. "

1-12
1-14
1-15
1-17
1-23
2-2
2-7
2-9
2-10
2-11
2-12
2-13
3-3
3-5
3-6
3-7
3-8
3-10
3-11
3-12
3-14
3-16
3-18
3-20
3-22
3-24
3-25

Tables
1-1
1-2
1-3
1-4
1-5
2-1

BA123 Signal Distribution Board Jumpers • • • • • • • • • • • •
Regulators A and B Power and Current ............... "
CPU Console Board Controls and Indicators ........... "
BA123 Cutout and Insert Panel Size . . . . . . . . . . . . . . . . . ..
Power, Bus Load, and VO Insert Data ................ "
BA123 Environmental Specifications ................. "
•

•

1-6
1-9
1-13
1-15
1-19
2-4

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

240 V Power Cords. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
BA123 Electrical Requirements . . . . . . . . . . . . . . . . . . . . . ..
BA123 Shipment Contents. . . . . . . . . . . . . . . . . . . . . . . . . ..
BA123 FRU s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

2-5
2-5
2-6
3-2

•

Preface
This guide provides reference, installation, and maintenance information
for the BA123 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 guide has three chapters and one appendix.
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
BA123 system.
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 provides a list of related documentation.

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

Provides information to prevent personal injury.

CAUTION

Provides information to prevent damage to equipment or software.

NOTE

Provides general information about the current topic.

••

VII

Chapter 1

SA 123 Enclosure Description
This chapter describes the BA123, which is a caster-mounted office
enclosure (Figure 1-1).
Figure 1-1:

BA123 Enclosure

~·r--~r .
;•

•

MLO-OOOO76

1.1

Storage

ce Areas

The BA123 has five 13.3-cm (5.25-in) mass storage slots (Figure 1-2).
However, power considerations usually limit the enclosure to a total of four
mass storage devices.

SA 123 Enclosure Description

1-1

Here is a typical configuration:
Slots 1, 2
Slot 4
Slot 5

RD50-series fixed-disk drives or other devices
TK50 tape drive
RX50 diskette drive

You can also connect external mass storage devices to the BA123, if their
enclosures meet requirements for electromagnetic interference (EM!). (All
DIGITAL enclosures meet requirements for EM!.)
Figure 1-2:

BA123 Mass Storage Slots

MLO-CXXXJ77

1-2

BA 123 Enclosure Maintenance

1.2 Backplane
-.

The BA123 has a 13-slot backplane that measures 27.9 em x 19.9 em (11 in
x 7.85 in). The backplane implements the extended LSI-11 bus, which uses
22-bit addressing. The common name for the LSI-11 bus is the Q22-bus.
The first 12 slots of the backplane are for dual- or quad-height modules
compatible with the Q22-bus. Each backplane slot has four rows: A, B, C,
and D (Figure 1-3).
Figure 1-3:

BA123 Backplane Grant Continuity and Jumpers
SLOT
•1

SLOT SLOT
12

, I

II I

,
,

I '

- ---

~ ,,

I,
,, ,
,
,

,
,
I

!
,

J3_

c
I '
J2-

,J.

JI
MLO-OOOO78

A dual-height module has connectors that fit into two rows of a backplane
slot. Two dual-height modules can occupy one backplane slot.
A quad-height module has connectors that fit into all four rows of a
backplane slot. One quad-height module occupies one backplane slot.

BA 123 Enclosure Description

1-3

As a rule, if you use dual-height modules in the AB or CD rows of slots
5 through 8, you must install another dual-height module, or an M9047
grant card, in the other two rows of each slot. The exception is the last
dual-height module installed on the grant continuity chain. For example,
if the last dual-height module is in the AB rows of slot 9, you do not need
a grant card in the CD rows. Figure 1-3 shows the grant continuity chain.
The CD rows of slots 1 through 4 are interconnected. This feature is
called the private memory interconnect (PM!). You should only use memory
modules in the CD rows.
The backplane has four 120-ohm resistor packs between slots 12 and 13.
These resistor packs terminate the Q22-bus. You cannot connect another
backplane to the BA123.
Slot 13 of the backplane does not implement the Q22-bus. The CD rows
are for the signal distribution board. The AB rows are for future use. Slot
13 provides +5 Vdc, +12 Vdc ground and the DC OK signal, which indicates
that the dc voltage from the power supply is stable.
The backplane supports a maximum of 38 ac loads and 20 dc loads for
MicroVAX, and 45 ac loads and 20 dc loads for MicroPDP-ll systems. 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 about 105
microamperes ().lA).
Figure 1-3 shows three J connectors on the backplane. J1 and J2 are
18-pin connectors that receive dc power and signals from two independent
regulators in the power supply. The backplane balances the load on each
of the two regulators, A and B.
•

Regulator A connects to Jl, supplying the odd-numbered slots and the
resistor packs.

•

Regulator B connects to J2, supplying the even-numbered slots.

J3 is a 10-pin connector for a cable to the CPU console board.

1-4

SA 123 Enclosure Maintenance

1.3 Signal Distribution
The signal distribution board (Figure 1-4) must be installed in the bottom
two rows (CD) of the last slot (13) of the backplane. If needed, a second
signal distribution board can be installed in the AB rows of slot 13.
Table 1-1 lists the jumper settings for the module.
Figure 1-4:

BA123 Signal Distribution Board (M9058)

J12 MOUNTED
ON BACK

W5 W6

J 11

o
J9

---, i ·

TP3
TP2
• TPI

•

ADO

ROO

@
MLO-OOOO79

SA 123 Enclosure Description

1-5

Table 1-1: BA 123 Signal Distribution Board Jumpers
Jumper

Setting!

Meaning

Wi, W2
Wi, W2

Out
In

Grant continuity not maintained.
Grant continuity maintained.

In
Out

DRV SEL 3 connected to DSI-DS4 of Jl.
DRV SEL 3 connected to DS3 of Jl.

In
Out

DRV SEL 4 connected to DSI-DS4 of J2.
DRV SEL 4 connected to DS4 of J2.

In
Out

DRV SEL 1 connected to DSI-DS4 of J3.
DRV SEL 1 connected to DSI of J3.

In
Out

DRV SEL 2 connected to DSI-DS4 of J4.
DRV SEL 2 connected to DS2 of J4.

TPI to TP2
TPI to TP3

DRV SEL 1 and 2 connected to DSI and DS2 of Jll.
DRV SEL 2 connected to DSI and DS2 of Jll.

! The factory position appears first.

Jumpers W3 through W6 determine the connections between the drive
select lines from a fixed-disk drive controller (DRV SEL 1 through DRV SEL
4) and a fixed-disk drive (DS1 through DS4). As long as these jumpers are
inserted, you can configure the drives to respond to any drive select line.
TP1 and TP2 determine the connections between the drive select lines from
a diskette drive controller (DRV1 through DRV4) and a diskette drive (DS1
through DS4). For an RX50, connect TP1 to TP2 for both drives.
You can connect up to four fixed-disk drives (or an RX50 diskette drive
and two fixed-disk drives) to the signal distribution board. A 50-conductor
ribbon cable connects the board to an RQDX mass storage controller module
in the card cage. Another ribbon cable connects the board to the RD console
boards behind the control panel. Figure 1-5 shows the cabling between the
signal distribution board and the rest of the system.

1-6

BA 123 Enclosure Maintenance

I-

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BA 123 Enclosure Description

1-7

1.4 Power Supply
The power supply (Figure 1-6) is a 460-watt unit with two regulators. Each
regulator supplies power to one-half of the slots in the backplane and to
mass storage devices inside the system.
The power supply provides protection against excess voltage and current.
The power supply regulators maintain proper output voltages against
temporary fluctuations in the ac input to the power supply. Table 1-2 lists
the minimum and maximum currents supplied by each regulator.
Figure 1-6:

BA123 Power Supply
POWER SUPPLY

---

,, ,

MLO-000CI8 ,

1-8

SA 123 Enclosure Maintenance

Table 1-2: Regulators A and B Power and Current
+12 Vdc

+5 Vdc

Power
Regulator

MaxI

Min

Max

Min

Max

230 W

4.5 A

36.0 A

7.0 A

230W

4.5 A

36.0 A

7.0 A

ITotal power used from each regulator must not exceed 230 W. This means the system cannot
draw the maximum current at +5 Vdc and +12 Vdc for both regulators at the same time.

The power supply has two other +12 Vdc outputs that are independent
of the main 460-watt output. These outputs drive the two fans that are
external to the power supply. The outputs also provide power to the
temperature sensors above the card cage.
The power supply also has the following controls and connectors at the rear
(Figure 1-7):
•

Circuit breaker to protect the power cable

•

Connector for remote control of power

•

Voltage select switch
120 V = 88 to 128 Vac
240 V = 176 to 256 Vac

•

International Electrical Commission (lEC)
compatible with international power cables

input connector,

NOTE: A minimum of 90 Vac (88 to 128 Vac setting) should be present at

the outlet for low-line operation, to compensate for line cord voltage drop.

SA 123 Enclosure Description

1-9

Figure 1-7:

BA123 Power Supply Controls and Connectors (Rear View)

CIRCUIT
BREAKER-_

REMOTE
CONTROL
CONNECTOR---r-VOLTAGE
SELECT
SWITCH

AC POWER
CONNECTOR

MLO-OOOO82

1-10

SA 123 Enclosure Maintenance

•

1.5 Control Panel
The control panel has six cutouts to provide space for control circuits
(Figure 1-8):
•

One cutout is for a CPU console board. This cutout contains the Restart
button, the DC OK LED, and the Halt button (Figure 1-8). To see the
CPU console board (Figure 1-9), you must remove the enclosure's left
side panel.

•

The other five cutouts are for mass storage console boards. Unused
cutouts are covered with removable plates.

Figure 1-8:

BA123 Control Panel

r - 'l~
,

o
RESTART
RUN

.. ..

•

DC OK

•

. ,

I,
HALT
I
I

•

WR ITEPROTECT

•

READY

••

MLO-OOOO83

BA123 Enclosure Description

1-11

Figure 1-9:

BA123 CPU Console Board

'RESTARTI
-RUN
_ _-DCOK
_HALT

GND

-+-SWITCH 1 _ - . ,
SWITCH 2 _-..,

SWITCHPACK

5 V TEST POINT FOR
REGULATORS A AND B

000
A

LED
'-- (REGULATOR B)
LED
' - - (REGULATOR AI

MlO-OOOO84

The CPU console board has two regulator LEDs that indicate failures in
the regulator supply to the backplane. If the DC OK indicator turns off,
these two LEDs indicate which regulator supply failed:
Left LED off = regulator A failed
Right LED off = regulator B failed
If a regulator LED is on, that regulator is providing +5 Vdc within tolerance
to the backplane.
NOTE: There should be at least one module in both euen- and odd-numbered

backplane slots to draw enough current to start each regulator.
A ribbon cable connects the CPU console board to the backplane. This cable
provides the connection between the CPU and the CPU console board.
Table 1-3 lists the controls and indicators on the CPU console board.

1-12

SA 123 Enclosure Maintenance

Table 1-3: CPU Console Board Controls and Indicators
ControllIndicator

Setting

Description

Restart

Momentary-contact pushbutton. When you press
IRestart bthe system simulates a power-downJpower-up
sequence to restart CPU operation. You can enable
or disable the Restart switch by using switch 2.

DC OK

Green LED indicator.
On

All de voltages are present and within tolerance.

Off

The Q22-bus BDCOK (dc bus power OK) signal is
negated.

Halt!

Pushbutton switch with red LED indicator.
Out
(LED om

Puts the CPU in program VO mode (normal position
for running user software).

In
(LED on)

Stops normal software operation. Puts the CPU in
console mode, where the system accepts only console
commands.

+5 V and +12 V
test points

Used to test the system.

Switch 1

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

Switch 2

To enable Restart, set switch 2 to on.
Restart, set switch 2 to off.

To disable

IMicroVAX: You can disable the Halt switch by setting the halt enable switch on the CPU VO
insert to the disable position (dot outside of circle). In this case, pressing IHaltl turns on the red
indicator but does not halt the system.

BA123 Enclosure Description

1-13

1.6 I/O Panel
The 110 panel (Figure 1-10) connects external devices to the BA123. 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
110 panel. Filtered connectors and inserts are included with the option's
cabinet kit.
The 110 panel has ten cutouts in two sizes, types A and B. You mount inserts
in the order shown (by letter) in Figure 1-10. Usually, the CPU 110 insert
is in cutout A. Unused cutouts are covered by removable plates. Table 1-4
lists the size of the cutouts and their corresponding inserts.
Figure 1-10:

BA123 I/O Panel

•

TYPE

•

c;j

•

~ l

•

~
--

•

TYPE

•

(;)

Ii>

•

1-1

.....

CUTOUT WITH
PLATE REMOVED

MLO-OOO085

1-14

SA 123 Enclosure Maintenance

Table 1~:
-

BA123 Cutout and Insert Panel Size

Type

Quantity

Description

Inches

Millimeters

Cutout
Insert panel

0.6 x 3.2

15 x 81

1.0 x 4.0

25 x 102

Cutout
Insert panel

2.25 x 3.2
2.5 x 3.3

57 x 81
64 x 84

You can add three more type-A cutouts by removing the bracket post
between the bottom two type-B cutouts and installing an adapter plate
(part no. 74-27720-01). Figure 1-11 shows the adapter plate with typical
type A and B inserts.
Figure 1-11:

BA123 Adapter Plate and Filtered Connectors
TYPE
,..---__ B

1-:"-. _

REMOVABLE
BRACKET
POST

•

TYPE
A
MLO-OOOO86

SA 123 Enclosure Description

1-15

1.7 Air Circulation
Three fans draw air in from the top of the enclosure:
•

One below the module card cage

•

One behind the control panel

•

One inside the power supply

A printed circuit board above the card cage contains two temperature
sensors (Figure 1-12):
•

One regulates the speed of the card cage fan.

•

One shuts down the system at high temperature.

The temperature sensors keep the speed of the card cage fan at the
minimum level required to maintain a constant temperature within the
card cage.
The card cage panel (new systems) or door (older systems) encloses the
area surrounding the modules. When the panel or door is removed, an
interlock switch is triggered that increases the speed of the card cage
fan to maximum. If the proper temperature within the card cage cannot
be maintained, even at maximum fan speed, the over-temperature sensor
causes the system to shut down.

1-16

BA123 Enclosure Maintenance

Figure 1-12:

BA123 Temperature Sensor Board

TEMPERATURE
SENSOR BOARD

TEMPERATURE
SENSORS
DOOR INTERLOCK
SWITCH
VIEW FROM REAR
OF ENCLOSURE

! !

; I
I, .,

MlO-OOOO87

SA 123 Enclosure Description

1-17

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, you must know the capacity of the
system enclosure in these areas:

Backplane
I/O panel
Power supply
Mass storage devices

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.

1-18

SA 123 Enclosure Maintenance

•

1.8.2 Configuration Worksheet
Use the BA123 configuration worksheet (Figure 1-13) to make sure a
configuration does not exceed a system's limits for expansion space, VO
space, power, and bus loads. If you use standard DIGITAL modules, you
will not exceed the limits for bus loads.
Use the 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 1-5.

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

NOTE: Check the CPU documentation to determine which options are

supported for a specific system.

Table 1-5: Power, Bus Load, and 1/0 Insert Data
Current
(Amps)

Power

Bus Loads

Option

Module

+5V

+12V

Watts

AAVll-D2
ADVll-D2

A1009
AlOOS
M311S-YA
M311S-YB
M3119-YA
M7504
M3121-PA
M3104
MS017
MS043
MS053
MS053-MA
MS053-MA

1.S
3.2
1.6
2.0
1.64
3.5
1.97
4.5
1.0
1.0
3.4
3.4
3.4

0.0
0.0
0.2
0.0
0.395
0.5
0.40
0.55
1.5
0.25
0.4
0.3S
0.3S

9.0
16.0
10.4
10.0
12.94
23.5
14.7
29.1
23.0

1.0
1.0
3.0
3.0
3.2
2.S
3.0
2.9
1.6
1.0
2.0
2.0
2.0

1.0
1.0
0.5
0.5
0.5
0.5
1.0
0.5
1.0
1.0
1.0
1.0
1.0

CXA16--M
CXB16--M
CXYOS-M
DEQNA
DFA01
DHVll
DLVEI-DP
DLVJ1
DMVll-M
DMVll-AP
DMVll-BP

s.o
21.S
21.6
21.6

Insert!

A
B (2)
A
B
A
B
A

!A = 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).
2Usually connected through a universal data input panel (UDIP), using a 13.3-cm (5.25-in)
mass storage slot.

BA123 Enclosure Description

1-19

Table 1-5 (Cont.): Power, Bus Load, and 1/0 Insert Data
-

CUizrent

(Amps)

Power

Bus Loads

Option

Module

+5V

+12 V

Watts

Insert!

DMVll-CP
DMVll-FP
DMVll-N
DPVll
DRVll
DRVll-BP
DUVll-DP
DRVll-J
DZQll
DZVll
IEQll
KA620-AA
KA630-AA
KA650-AA
KDA5O-Q3

M8064-MA
M8053-MA
M8064
M8020
M7941
M7950
M7951
M8049
M3106
M7957
M8634
M7478
M7606
M7620-A
M7164
M71654
CorDrev
M71654
E rev
M8189
M8190
M8190
M7740
M7500
M4002
M8027
M7942
M7942

3.35
3.4
3.4
1.2
0.9
1.9
1.2
1.8
1.0
1.2
3.0
6.2
6.2
6.0
6.93
6.57

0.26
0.38
0.4
0.3
0.0
0.0
0.39
0.0
0.36
0.39
0.0
0.14
0.14
0.14
0.0
0.03

19.9
21.6
21.8
9.6
4.5
9.5
10.7
9.0
9.32
10.7
15.0
32.7
32.7
31.7
34.65
33.21

2.0
2.0
2.0
1.0
2.8
3.3
3.0
2.0
1.5
3.9
2.0
2.7
2.7
2.7
3.0

1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.5

B
A (2)

4.07

0.03

20.71

5.5
5.5
5.5
3.0
2.6
2.2
0.8
1.6
2.8

0.1
0.1
0.2
0.0
0.2
0.013
0.0
0.0
0.0

28.7
28.7
29.9
15.0
15.4
11.2
4.0
8.0
14.0

2.3
2.3
2.6
2.3
3.0
1.0
1.4
3.0
1.8

KDA5O-Q
KDA50-Q
KDFll-BE
KDJll-BC
KDJll-BF
KLES1
KMVll
KWV11-C2
LPVll
MRV11-D5
MRV11-D

A
A
A (2)
A (2)
A (2)
A (2)
B
B
B

1.1
1.1

1.0
1.0
1.0
1.0
1.0
0.5
1.0

B
B

A
B

!A = 2.5 cm x 10.0 cm (1 in x 4 in).
B = 5.0 cm x 7.5 cm (2 in x 3 in).
2Usually connected through a universal data input panel (UDIP), using a 13.3-cm (5.25-in)
mass storage slot.
3KDA50-Q is a two-module set (M71641M7165). AC and DC bus loads listed = total for both
modules.
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-x is a revision E module.
5Unpopulated module.

1-20

SA 123 Enclosure Maintenance

Table 1-5 (Cont.):

Power, Bus Load, and I/O Insert Data
Cunent
(Amps)

Option
M9060--YA
MS630--AA
MS630--BA
MS630--BB
MS630--CA
MS650--AA
MSVll-J"D
MSVll-J"E
MSVll-PK
MSVll-PL
MSV11-QA
RA70
RC25
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

Power

Bus Loads

Module

+5V

+12V

Watts

M7607

5.3
1.0

M760B

1.B

M760B

1.B

M7609
M7621-A

3.1
2.7
3.74
4.1
3.45
3.6
2.4
3.3
1.0
1.0
1.0
0.9
1.3
1.3
5.0
6.4
6.4

26.5
5.0
9.0
9.0
15.5
13.5

0.0
0.0
0.0
0.0
0.0
0.0
2.7
2.7
2.0
2.0
2.0

0.0
0.0
0.0
0.0
0.0
0.0
0.5
0.5
1.0
1.0
1.0

0.5
0.5

0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
2.9
2.5
1.6
2.5
2.5
1.34
1.34
0.10
0.25
0.1
0.06
0.0
0.3

0.B5

1.B

1.35
1.35
1.35
1.5
4.0
2.9
6.5

2.4
2.4
2.4
2.4

MB637-D
MB637-E
MB067-K
MB067-L

M7551-AA

MB061
MB639-YA
MB639-YB

M7555
M7513

M7605
M7546
M7196

2.4B

0.0
0.0

1B.7

20.5
17.25
17.5
12.0
51.3
35.0
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

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.B

3.0

1.0
0.5
1.0

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).

SA 123 Enclosure Description

1-21

Table 1-5 (Cont.):

Power, Bus Load, and 1/0 Insert Data
CUl'rent
(Amps)

Power

Bus Loads

Option

Module

+5V

+ 12 V

Watts

Insert l

VCBOI
VCB02
VCB02

M7602
M7169
M7168

4.6
5.8
3.4

1.5
0.75
0.0

42.0
38.0
17.0

3.0
3.5
0.0

1.0

0.0

1 A = 2.5 ern x 10.0 ern (1 in x 4 in).

B = 5.0 ern x 7.5 ern 12 in x 3 in).

1-22

SA 123 Enclosure Maintenance

Figure 1-13:

BA123 Configuration Worksheet
ADD THESE COLUMNS
r~-------------------------------~----------------------------~\

REGULATOR B

REGULATOR A
SLOT

MODULE

CuRRENT
+5 VDC

,AV1PS
+, 2 VDC

POWER
,WATTS,

CURRENT

lAMPS,

+5 VDC

+12 VDC

36 A

10 INSERTS
S

1 AB
CD
AS

f------

CD f-----3 AB

CD
r----AB

..:<.

CD
.P
5 A~

CD
6 '::"B

'CD f..----

-;' '::"3

CJ
,

•. -,

r-----

~
", p

'--'

;\ B

r----r-----

,- ., f-----1:.2 AB
D
I-~

~b
~,

'-'

f-:::5-:G:-:\-~:-:L

=60

DIS~

•

c •

;)

00L""J
',-,
'J" "
TOTA LS
\1I,;5T ~O~
EXCEED

36 A

230 \'i

230 W

'RECO\1MENDED FOuR JRIVES MAXI'V1UM - TWO IN SHEL'/ES 1 A'lJD 2, TWO IN 3, 4 OR 5
"IF MORE THAN FOUR 1 x 4 10 PANELS ARE REOUIRED AN ADAPTER TEMPLATE MAY BE uSED
MlO-OOOO88

SA 123 Enclosure Description

1-23

I
I
I
I
I

I
I
I
•

I
I
I
I

I
I
I
I
I

I
I
I
I

I
I

I
I
I
I

I
I
I
I
I

I
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I
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I
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I
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I

Chapter 2

Installation
This chapter provides site preparation and installation guidelines for the
BA123 enclosure.

2.1 Preparing the Site
Before you unpack the BA123 enclosure shipment, verify the physical,
environmental, and electrical site requirements.

2.1.1 Dimensions
Figure 2-1 shows the dimensions of a BA123 enclosure. The figure also
shows the dimensions of the shipping container.
WARNING: Use two people to handle the shipping container and enclosure.

The shipping container and the enclosure together weigh 100 kg (220 lb);
the enclosure weighs 59 kg (130 lb).

Installation

2-1

Figure 2-1:

BA123 Enclosure Dimensions

52.07 em
''"__ _ _ 92.71 em
(20.50 In)--"I
136.50 in) _ __

1----

83.82 em
(33.00 Inl

6985 em
(275,nl

,
,

WEIGHT: 100 kg (220 Ib)

J.-3302 em
~(130'nl

WEIGHT: 59 kg (130 Ib)
MlO-0Cl0089

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.

2-2

SA 123 Enclosure Maintenance

2.1.3 Acoustics
The BA123 pedestal enclosure is designed for use in offices and other
general working areas. The following are acoustic emission and heat
dissipation levels for the BA123. Levels may be lower, depending on the
kind and number of mass storage devices in the system. Data is measured
in accordance with ANSI S12.10-1985 (American National Standards
Institute) and ISOIDIS 7779 (International Standards Organization).
•

LNPE (B) is the noise power emission level (A-weighted sound power
level) measured in bels re 1 pw (reference 1 picowatt). LNPE for the
BA123 enclosure is 6.0.
.

•

LPA is the sound pressure measured in decibels at 1.0 m (3.3 ft) from
the front edge of the unit and 1.5 m (5.0 ft) above the floor. LPA for the
BA123 enclosure is 46.

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 409t.

•

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.

2.1.6 Heat Dissipation
Heat dissipates in the BA123 enclosure system at the rate of 2355 Btu per
hour.

Installation

2-3

2.1.7 Environmental Specifications
Table 2-1 shows the temperature ranges, humidity ranges, and altitude
limits for systems in the BA123 enclosure.

Table 2-1 : BA 123 Environmental Specifications
P81'8meter

_ _~R~a~n~g~e_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

Operating:!

10 0 e to 40 0 e
50°F to 104°F

Nonoperating:

-40 oe to 60 0 e
-40°F to 140°F

Temperature rate of change

Operating:

11 °e per hour maximum
19.8°F per hour maximum

Relative humidity

Operating:

20% to 80% (noncondensingJ

Nonoperating:

10% to 95%

Operating:

2440 m (8000 ft)

Nonoperating:

4900 m (16,000 ft)

Temperature

Maximum altitude

! For operation above sea level, decrease the operating temperature by l.8°e per 1000 m (or
1°F per 1000 ft).

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 micro 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 BA123 enclosure. Table 2-3 lists electrical requirements for systems in
the BA123 enclosure.

2-4

SA 123 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 New Zealand

BN06A-2E

Denmark

BN07A-2E

Italy

Table 2-3:

BA123 Electrical ReqUirements

Nominal ac Voltage

lOOVac

120Vac

220-240Vac

Voltage range

90--110 Vac

104-128 Vac

191-256 Vac

Power source phase

Single

Nominal frequency

50 60 Hz

50--60 Hz

Frequency range

47-63 Hz

Maximum steady state
current at nominal voltage

10.5 A

8.8 A

4.4 A

Maximum steady state
current at minimum voltage

12 A

1LOA

5.5 A

Maximum inrush current

100 A

Maximum power consumption

690W

2.2 Unpacking the Shipment
Unpack all boxes and check the contents listed in Table 2-4. Instructions
for unpacking the system box are on the shipping carton.

Installation

2-5

Ie 2-4:

BA123 Shipment Contents

Description

Qty.

Part No.

Basic BA123 enclosure

BA123

Signal distribution board
RQDX-to-M9058 cable

M9058
17-01520-01

Cable for M9058 to 5 disk control panels

17-00862-01

RX cable
TK cable

1
1

17-00867-01
17-01047-01

Disk control panel

70-22393-01

Disk data cable
Disk control cable

17-00282-01

Half-height filler panel

17-00286-01
74-31478-01

BA123 accessory kit
Console panel assembly (MicroPDP-ll only)

70-22382-03

Console backplane cable

70-21150-02
17-00624 01

Cable 20-pin console
Function SellSLU console connect (MicroVAX only)

1
1

17-00712-02
54-16744-01

In addition to the above parts, the shipment may include some of the
following equipment:
Additional terminal(s)
Printer(s)
ModemCs)
Cables for connecting additional devices

2.3 Installing the BA 123 System
To install the BA123-based system, perform the following steps:
1.

2-6

After unpacking the system enclosure, move it to where it will be used_
Carefully roll the enclosure into position. Be sure to:
a.

Allow enough space around the unit for air circulation and
servicing. The system requires 5.08 cm (2 in) for ventilation on
each side. You should leave about 61 cm (2 ft) at the rear of the
system to connect cables and access controls behind the rear cover.

Keep food and liquid away from the enclosure.

Place the enclosure away from heaters, photocopiers, and direct
sunlight.

SA 123 Enclosure Maintenance

...

Minimize static by placing the enclosure away from busy office
corridors.

Keep the area free from dust and other abrasive materials.

Unpack the installation and user guides for the console terminal, which
is the first terminal you connect to the system.

Follow the installation guide to unpack and install the console terminal.

Open the rear door of the enclosure. The door is held in place by a pop
fastener (Figure 2-2).

Figure 2-2:

Opening the Rear Door

MLO-OOOO90

- ---

Set the controls on the CPU VO insert found at the rear of the enclosure
to the following positions:

Installation

2-7

MicroVAX (Figure 2-3)
a.

Set the baud rate for the console terminal serial line to 9600 on the
8-position rotary. Also set the baud rate on the console terminal to
9600; the baud rates must match.

Set the mode to the middle position (language inquiry) on the 3position rotary.

Arrow Run (factory position).
If the console terminal
supports the Multinational Character Set (MCS), you are
prompted for language only if the battery backup has failed.
Full start-up diagnostics are run.
Face Language inquiry. If the console terminal supports the
MCS, you are prompted for language on every power-up and
restart. Full start-up diagnostics are run.
T in a circle Test. ROM programs run wraparound serial line
unit (SLU) tests.
c.

Set the halt enable/disable switch to the disable position (down) on
this 2-position rotary.

Dot outside circle Halts are disabled (factory position). On
power-up or restart, the system attempts to load software from
one of the devices at the completion of start-up diagnostics.
Dot inside circle Halts are enabled. On power-up or restart,
the system enters console va mode at the completion of start-up
diagnostics.
MicroPDP-ll (Figure 2-3)
a.

2-8

Set the baud rate for the console terminal serial line to 9600. Also
set the baud rate on the console terminal to 9600; the baud rates
must match.

BA 123 Enclosure Maintenance

----

Figure 2-3:

BA123 CPU 1/0 Inserts

MicroVAX
HALT
ENABLE/DISABLE

_+-

MODE _I-.

r;:::=
300
L,
600

Baud

BAUD _

:200
2400
4800

960C
19200
38400

OR
MicroPDP
DISPLAY OF
ERROR
DETECTION/
DIAGNOSTIC
STATUS
.
CODE

• == 01<-

BAUD
RATE
SELECT
SWITCH

8-. S
B~uJ

38400
. 9200

9600
4800
2400

. ~..J"
.
•

'e"t,;

60-]
30e

,3
5
6
,

•

8
MlO-{)(l()()91

Connect the console terminal cable to the console terminal and the
enclosure (Figure 2-4).

Installation

2-9

Figure 2-4:

Connecting the Console Terminal to the CPU 1/0 Insert
(Example)

TO CONSOLE
TERMINAL

---=

JOO
600
1200

2400
' - 4800

9600
19200
38400

MLO-OOOO92

Install and connect any extemal devices. Refer to Figure 2-5. External
devices may include terminals, printers, modems, and storage devices.
The devices may be connected in any order. Refer to the installation
guide included with each device.

2-10

BA123 Enclosure Maintenance

Figure 2-5:

Connecting External Devices

,-c.c' ,

+--ADDITIONAL
DEVICES

POWER
-SUPPL Y
SETTINGS

CABLE GUIDE

MLO--OOOO93

Check the voltage switch setting on the rear of the power supply
(Figure 2-5). Peel back the label covering the switch to see the voltage
setting. If necessary, change the switch setting to match the voltage
source you are using (Figure 2-6).
CAUTION: Be careful to set the voltage correctly. An incorrect voltage

switch setting can damage your system.

Installation

2-11

Figure 2-6:

Checking the Voltage Setting

READ AND
REMOVE

CAUTION
LABEL

115V
IN NORTH AMERICA THE
SWITCH IS SET TO 115V

-------

o
o
o
, ,

----

220V 1230V 1240V
IN OTHER COUNTRIES THE
SWITCH IS SET TO 230V.
I F NOT, Sli DE SWITCH TO
230V.

0
0
0

ML0-{)()()()94

Set the power switch on the front of the enclosure to 0 (om.

10. Plug the power cord into the power supply and the wall outlet
(Figure 2-7). Thread all the cables through the lower cable guide.

2-12 SA 123 Enclosure Maintenance

Figure 2-7:

Attaching the Power Cord

MLO-OCXXl95

11. The installation of the BA123 enclosure is now complete. Refer to the
CPU maintenance documentation for procedures on running power-up
self-tests and diagnostics.

Installation

2-13

Chapter 3

FRU Removal and Replacement
This chapter describes how to remove and replace the field replaceable units
(FRUs) in the BA123 enclosure.
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.
CAUTION:

•

Only qualified service personnel should remove or install FRUs.

•

Before you remove any FRU, always 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 you work with the
internal parts of a computer system.

3.1 FRUs
Table 3-1 lists the BA123 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 FRU s.

FRU Removal and Replacement

3-1

Table 3-1: BA123 FRUs
FRU

Pal t Number

20-conductor RD drive cable
40-conductor RD drive cable
50-conductor cable, RQDX to signal distribution board
AC power switch and cable from switch to power
supply
Battery backup unit, CPU insert panel (MicroVAX)
Cable, backplane to CPU console board
Cable, MicroVAX memory interconnect
Cable, power supply to card cage fan and temperature
sensor
Cable, power supply to mass storage fan
Cable, regulator A to backplane
Cable, regulator B to backplane
Cable, regulator A to 2 drives via 2 plugs
Cable, regulator B to 3 drives via 3 plugs
Cable, signal distribution board to 4 RD consoles
Cable, signal distribution board to RX50
Cable, TK50-to-M7546 interconnect
Card cage fan, 12.7 ern (5 in)
Door interlock switch and cable from switch to temperature
sensor board
Mass storage fan, 11.4 ern (4.5 in)
Power supply

17-00282-01
17-00286-01
17-01520-01
17-00859-01

Q22-bus quad-height backplane (13 slots)
RD5n console read/write protect panel
Signal distribution board
Shock-isolating caster, fixed (2)
Shock-isolating caster, swivel (2)
Temperature sensor board

3-2

BA 123 Enclosure Maintenance

12-19245-01
17-00860-01
17-00716-01
17-00863-01
17-00864 01
17-01311-02
17-01311-02
17-01356-01
17-00911-01
17-00862-01
17-00867-01
17-01047-01
12-23395-01
17-00942-01
12-22271-01
30-23616 OIl
30-28231-01
54-17507-01
54-16244 02
M9058
12-23985-01
12-23985-02
54-16665-01

(

BA123 FRUs

Figure 3-1:

TO DRIVE 3 OR 4

170131102
TO DRIVE 5

TO DRIVf
lOR 2

POWE R SUPPL Y

1700911 01

17·00859·01

170135601

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RACKPU\Nf

ON/m,

S4 11507 01

1 10086101

SWITCH

HMPERATURE
SENSOR MUDULE

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CPU CONSOI F BOARD
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CAULE TO RACKPI ANl "'"
17·00Hfi{) 01

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16L44·02~

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MASS STORAGE.

FAN
17-777/1-01

!14-16665-0

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170157001
1 I 00287·01

HOOX). TOK!,O AND SICNAl VISTRIAU liON
BOARO SHOWN All OL2-BUS MO[)ULlS ARF
FRUS

1 I-()())Hti 01
MI ()

OOO(l~jh

3.2 Accessing FRUs
Before you can remove most FRU s in the BA123 enclosure, you must remove
one or more side panels. Removing a side panel is the first step in many of
the FRU procedures.

3.2.1 Right Side Panel
Remove the right side panel as follows:
1.

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

Open the rear door.

Refer to Figure 3-2 for steps 3 through 5.
3.

Loosen the captive screw that connects the right side panel to the rear
of the enclosure frame.

4. Two snap fasteners hold the bottom of the panel to the frame. Pull out
the bottom of the panel until you release the fasteners.
5.

Lift the panel slightly to release it from the lip at the top of the frame.
Remove the panel.

3 4

BA 123 Enclosure Maintenance

Figure 3-2:

Removing the Right Side Panel

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~-----

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ML0-000097

Newer systems also have an inner panel. To remove, unscrew the two
quarter-tuIIl fasteners at the base of the panel (Figure 3-3).

FRU Removal and Replacement

3-5

Figure 3-3:

Removing the Right Inner Panel
.

CARD CAGE DOOR

----

,,,

/
QUARTER·TURN
FASTENERS
MLO-OOOO98

3.2.2 Left Side Panel
Remove the left side panel as follows:
1. Tum off the system and unplug the ac power cord from the wall outlet.

2. Open the control panel door.
Refer to Figure 3-4 for steps 3 through 5.
3.

Loosen the screw that holds the left side panel to the front of the
enclosure frame.

Two snap fasteners hold the bottom of the panel to the frame. Pull out
the bottom of the panel until you release the fasteners.

5. Lift the panel slightly to release it from the lip at the top of the frame.
Remove the panel.

3--6 BA 123 Enclosure Maintenance

....

...

Figure 3 4:

Removing the Left Side Panel

Ml0-000099

Newer systems also have an inner panel. To remove, unscrew the two
quarter-turn fasteners at the base of the panel (Figure 3-5).

FRU Removal and Replacement

Figure 3-5:

Removing the Inner Left Panel

--.-

....l-i""---

--.

,
,'

I
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•

QUARTER-TURN
FASTENERS
STORAGE DEVICE DOOR

MlO-OOOl00

3.2.3 Top Cover
Remove the top cover as follows:
1.

Open the rear door.

Remove the screw at the top of the frame, above the I/O panel. This
screw holds a bracket connected to the top cover.

3. Four tabs hold the top cover in place. To release the cover, push it back
as far as it will go (about 2.5 cm; 1 in).
4.

3--a

Lift the top cover off the frame.

SA 123 Enclosure Maintenance

3.3 Modules
Remove modules as follows:
CAUTION:

•

Static electricity can damage integrated circuits. Use the wrist strap
and antistatic mat found in the Antistatic Kit when you work 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.

Remove the outer and inner right side panels (Section 3.2.1).

Older systems have a card cage door instead of an inner panel. Release
the two clasps at the front end of the door and swing the door open.
Remove the door from its hinges. Figure 3-6 shows the removed card
cage door.

Quad-height modules have levers (Figure 3-6) to lock the module in the
backplane. When you remove a quad-height module, use the levers to
slide the module partially out of the backplane. Pull the levers firmly
toward you. Apply pressure evenly to both levers.
Dual-height modules do not have levers; they simply slide in and out
of their slots.

Label and disconnect any cables connected to the module.

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

FRU Removal and Replacement

3-9

Figure 3-6:

Removing Modules

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MlO-OOO10l

Installation Notes

•

Make sure the jumper and switch settings on the new module are the
same as those on the removed module.

•

If you install a dual-height module in slots 1 through 4 of the backplane,
you must install it in the AB rows. If no modules are installed in the
AB rows, you must install a grant continuity card (M9407).

•

You can install dual-height modules in either the AB or CD rows of
slots 5 through 12. The other two rows of the slot must contain either
another dual-height module or a grant continuity card.

3-10

BA123 Enclosure Maintenance

3.4 On/Off Switch
Remove the on/off switch as follows:
1.

Remove the outer and inner left side panels (Section 3.2.2).

Unplug the on/off switch cable from the rear of the power supply (see
Figure 3-1 for cable connection).

Remove the nut that holds the cable's ground lead (Figure 3-7) to the
BA123. Disconnect the ground lead.

Press the top and bottom of the on/off switch, then push out the switch
and its cable from the inside of the front panel (Figure 3-7).

Figure 3-7:

Removing the On/Off Switch

GROUND LEAD

,. ,,
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;

MLO-OOO102

3.5 CPU Console Board
Remove the CPU console board from the control panel as follows:
1.

Remove the outer and inner left side panels (Section 3.2.2).

Refer to Figure 3-8 for steps 2 through 4.
2.

Disconnect the ribbon cable from the CPU console board.

FRU Removal and Replacement 3-11

3.
4.

Remove the two screws that hold the CPU console board assembly to
the control panel.
Remove the board from the plastic brackets.

Figure

Removing the CPU Console Board

MLO-OOO 103

3-12

SA 123 Enclosure Maintenance

3.6 Mass Storage Devices
Remove 13-cm (5.25-in) drives as follows:
CAUTION:

•

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

•

Do not turn off the system, or a TK-series tape drive if you have a
TK cartridge in place. Never put your hands or other objects in the
cartridge opening.

•

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

Remove the outer and inner side panels (Sections 3.2.1 and 3.2.2).

The front panel has four snap fasteners that hold the panel to the
BA123. Remove the front panel by pulling it from the frame until you
release the fasteners.

Disconnect all signal cables and dc power cords from the device.

Push down on the release tab under the front of the drive, then slide
the device out of the shelf.

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

3.7 Fans
You can remove the mass storage fan and the card cage fan. The fan in the
power supply is not an FRU.

3.7.1 Mass Storage Fan
Remove the mass storage fan as follows:
1.

Remove the outer and inner left side panels (Section 3.2.2).

Unplug the dc power cord from the fan (Figure 3-9). The plug is curved
to fit the fan. When you replace the fan, make sure to align the plug
the same way.

Remove the three screws that hold the fan's metal base plate to the
BA123 (Figure 3-9). Note the fan's alignment. Make sure to align the
new fan in the same direction.

FRU Removal and Replacement

3-13

4. On older systems, remove the four screws that hold the fan to the metal
base plate. On newer systems, snap out the fan from the metal base
plate.
Figure ~9:

Removing the Mass Storage Fan

Ml0-000104

~ 14

SA 123 Enclosure Maintenance

3.7.2 Card Cage Fan
Remove the card cage fan as follows:
1.

Remove the outer and inner right side panels (Section 3.2.1).

Older systems have a card cage door instead of an inner panel. Remove
the door by releasing the two clasps at the front end of the door and
swinging the door open.

Refer to Figure 3-10 for steps 3 through 5.
3. Slide the tray below the card cage partially out.
4. Unplug the dc power cord from the fan. The plug is curved to fit the
fan. When you replace the fan, make sure to align the plug the same
way.
5.

On older systems, remove the four screws that hold the fan to the tray.
On newer systems, snap out the fan from the tray.

FRU Removal and Replacement

~ 15

Figure 3-10:

Removing the Card Cage Fan (Older Systems)

MLO----CKXll05

3-16

BA123 Enclosure Maintenance

3.8 Power Supply
Remove the power supply as follows:
1.

Remove the outer and inner left side panels (Section 3.2.2).

Note the location and alignment of all cables connected to the power
supply. Disconnect all cables, including the ac power cord at the rear
of the system.

Unfasten the four quarter-turn fasteners holding the power supply to
the enclosure (Figure 3-11). Remove the power supply.

CAUTION: Before you install a new power supply, make sure the setting

of the voltage select switch at the rear of the power supply is correct. An
incorrect setting can cause damage to the system.

FRU Removal and Replacement

3-17

Figure 3-11:

Removing the Power Supply

-,
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-,.

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MLO-OOO106

3-18

BA123 Enclosure Maintenance

3.9 Door Interlock Switch
Remove the door interlock switch as follows:

-----

Remove the outer and inner right side panels (Section 3.2.1).

Older systems have a card cage door instead of an inner panel. Remove
the door by releasing the two clasps at the front end of the door and
swinging the door open.

Figure 3-12 shows the cable connecting the interlock switch to the
temperature sensor board. Disconnect the cable from the temperature
sensor board.

Remove the two screws that hold the switch to the side of the card cage.

Remove the switch and the cable.

FRU Removal and Replacement

3-19

Figure 3-12:

Door Interlock Switch and Temperature Sensor Connection

TEMPERATURE
SENSOR BOAR

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'{Y :
DOOR INTER LOCK
SWITCH
VIEW FROM REAR
OF ENCLOSURE

I .

MLO-OOO107

3-20

BA 123 Enclosure Maintenance

3.10 Temperature Sensor Board
Remove the temperature sensor board as follows:
1.

Remove the outer and inner right side panels (Section 3.2.1).

Older systems have a card cage door instead of an inner panel. Remove
the door by releasing the two clasps at the front end of the door and
swinging the door open.

Figure 3-12 shows the cable connecting the interlock switch to the
temperature sensor board. Disconnect this cable from the temperature
sensor board.

Find the cable connecting the temperature sensor board to the power
supply. Disconnect this cable from the temperature sensor board.

Remove the temperature sensor board from the four plastic brackets
that hold it to the frame.

3.11 Backplane
Remove the backplane as follows:
1.

Remove the outer and inner side panels (Sections 3.2.1 and 3.2.2).

Slide all modules partially out of the backplane, including the signal
distribution board.

Remove the power supply (Section 3.8).

Find the metal plate between the backplane and the power supply.
Remove the nine screws that hold the plate to the BA123: six on the
front and three on the side (Figure 3-13).

Lift the metal plate and the backplane out of the rear of the card cage.

Remove the screws that hold the metal plate to the backplane.

FRU Removal and Replacement 3-21

Figure 3-13:

Removing the Backplane

BACKPLANE

--+---'I

MLO-OOO108

Installation

Install the screws that hold the metal plate to the backplane.

Place the backplane and the metal plate at the back of the card cage.

Insert the nine screws that hold the metal plate to the card cage, but
do not tighten.

Insert modules in the first and last card guides of the card cage. This
step aligns the backplane with the card cage guides.

Tighten the screws on the metal plate.

Check the alignment of the backplane by inserting all the modules in
their original slots.

Replace the power supply by reversing the steps in Section 3.8.

3-22

SA 123 Enclosure Maintenance

3.12 CPU 1/0 Insert
Remove the CPU

va insert as follows:

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

Open the rear door.

Disconnect the console terminal cable from the CPU

Remove the outer and inner right side panels (Section 3.2.1).

Older systems have a card cage door instead of an inner panel. Release
the two clasps at the front end of the door and swing the door open.
Remove the door by disengaging its hinges.

va insert.

NOTE: Some internal cables connected to the back of I/O inserts may not

be keyed. Note the alignment of internal cables and make sure you reconnect
them the same way.
6.

Label and disconnect cables that connect the CPU VO insert to modules
inside the enclosure.

Remove the screws that hold the CPU VO insert to the I/O panel.
Figure 1-11 shows the orientation of the inserts on the VO panel.

Remove the CPU 110 insert.

3.13 MicroVAX Battery Backup Unit (BBU)
Remove the battery backup unit for the time-of-year clock as follows:

va insert, using the procedure in Section 3.12.
2. Remove the batteries from the CPU va insert:
1.

Remove the CPU

Disconnect the battery backup unit cable from the CPU 110 insert
(Figure 3-14).

FRU Removal and Replacement

3-23

Figure 3-14:

Disconnecting the Battery Backup Unit Cable
-~

MlO-OOO'lO

3-24

Carefully spread the plastic holder and pop out the battery backup
unit (Figure 3-15).

BA 123 Enclosure Maintenance

Figure 3-15:

Removing the Battery Backup Unit

I .' ,

•.. \~

,I,

•

'--..J
-

•

MLO-OOOl 1 1

FRU Removal and Replacement

3-25

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I
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o

I
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Appendix A

Related Documentation
The following documents contain information relating to :\1icroVAX or
:VIicroPDP-ll systems.
Document Title

Order Number

Modules
CXA.16 Technical :'IJanual
CXY08 Technical :'IIanual
DEQ:\A Ethernet Cser's Guide

EK-CAB16-TM

DHVll Technical :'IIanual

EK-DHV11-T:'.r

DLVll-.J User's Guide

EK-DLVIJ-CG

D1\I\'11 Svnchronous
Controller Technical :\lanual
•

EK-DMVll-TM

DMV11 Svnchronous Controller Cser's Guide
DPVll Svnchronous Controller Technical Manual

EK-mJVll-CG

EK-CXY08-nr
EK-DEQ~A-CG

•

EK-DPV11-TM
EK-DPVll-CG

•

DP\'l1 Svnchronous
Controller Cser's Guide
•
DRVll-J Interface L'ser's ]\Ianual

EK-DRVIJ-CG

DRVll-WA General Purpose D;\rA eser's Guide

EK-DRVWA-UG

DZQ11 Asynchronous :\lultiplexer Technical :'IIanual

EK-DZQll-nr

DZQll Asynchronous Multiplexer eser's Guide

EK-DZQll-CG
EK-DZVll-TM

DZVll Asynchronous :'IIultiplexer Technical :\lanual
DZ\'l1 Asynchronous :'II ultiplexer C ser's Guide

EK-DZVll-CG

IEUll-AIEQll-A eser's Guide
K:\6:30-AA cpe Module C,er's Guide

EK-IECQI-CG

K..... 640-A.A. CPU Module eser's Guide

EK-KA640-CG

K..... 650-......'" CPU Module eser's Guide

EK-KA650-UG

KDA50-Q CPC :'IIodule eser's Guide

EK-KDA5Q-UG

KDJll-B CPC :'Ilodule eser's Guide

EK-KDJ lB-CG

KDJll-DS CPU Module eser's Guide
KDFlI-BA CPU Module eser's Guide

EK-KDJID-UG
EK-KDFEB-UG

K.\IVll Programmahle Communications Controller Cser's Guide

EK-KMVII-UG

K.\IVll Programmable Communications Controller Technical
:\lanual

EK-K.\JVll-TM

EK-KA630-CG