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November 1981

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Document:	MicroVAX 3100 Platform BA42-A Enclosure Maintenance
Order Number:	EK-A0510-MG
Revision:	001
Pages:	115
Original Filename:

OCR Text

MicroVAX 3100 Platform
BA42-A Enclosure Maintenance
Order Number: EK-AG510-MG.001

November 1981

This manual provides reference, installation, and maintenance information
for the BA42-A enclosure. The MicroVAX 3100 Mode] 30 system uses this
enclosure.

Revision information:

Dightal Equipment Corporation
{laynard, fassachusstte

This is 2 new manual.

November 1081

The information in this document is subject to change without notice and should not be
consirued as » commitment by Digital Equipment Corporation. Digital Equipment Corporation
assumes no responsibility for any errors that may appear in this document.

No responsibility is assurned for the uge or reliability of eoftware on equipment that is not
supplied by Digital Equipment Corporation or its effiliated companies.
Restricted Rights: Use, duplication,
cr disclosure by the U.S. Government
is subject to
vestrictions as set forth in subparagraph (c)(1)(ii) of the Righta in Technical Data and Computer
Softweare clanse at DFARS 282.227-7013.
© Digital Equipment Corporation 1991.
All Rights Reserved.

The poetpaid Reader's Comments forms at the end of this document request your critical
evaloation to assist in preparing future dscumentation.

mwmvunocum.w?mmfimmmm. -

‘the following
are trademarks of Digital

ment Corporation:

AX,

DEC, Digital, MicroV.

This document was prepared using VAX DOCUMENT, Version 2.0.

Contents
ix

Enclosure Des
1

1.2
1.3
14

15
1.5.1
1.8.2
1.5.3

Mass Storage Device Areas ..............
.. .. iiiiiiann
Controls, Indicstors, Ports, and Connectors . . ... ............
Power and Signal Distribution . . . .........
... .. ... ...
AirCireulation
..............
it
e
Configuration Guidelines . . . ............
... .. ...
..
Memory . ...ttt
i i
et
e
Communications Options . . ..................ciiernn.
Mass Storage Devices. . .. ..........
vt

1-3
-3
-8
1-12
1-12
1-12
-13
i1-16

2 Installation
2.1
211
2.1.2
2.1.3

214
215
2.16

2.1.7
2.2
2.3

23.1
23.2
2.3.3
23.4

2.3.5
236

Preparing the Site . ......... ... .. . . i
.
DIMENSIONS . .......c.c.0v
ittt i
e
e
Additional Equipment .................c0itirutrnnn
Operating Environment ... .............. e e
Electrostatic Discharge .............................
Heat Dissipation ................
...
iiiininnn..
Temperature, Humidity, and Altitude Ranges ............
Electrical Requirements . . . ... ..................
...
UnpackingtheSystem .. ...........
... ... ...,
Installing the BA42-ASystem ...................c.c.....
Placing the BA42-AEnclosure ........................
Identifying the Ports and Connectors on the System Unit . . .
Connecting the Console Terminal to the System Unit ... ...
Connecting the ThinWire Terminator or Loopback
L0 7cTY
/
C@mem% the System Unit Power Cord . ...............
ingOntheSystem ........................... .

2-1
2-1
2-2
2-3
2-3
2-3
2-3
-4
2-5
-7
2-7
2-7
e-7
2-10
2-12
2-14

i‘i

lacing FRUs
3.1
3.2
3.3
3.3.1

Removing the Emlosu?e COVer ... i e

fi@fiiwmg an MS4

Removing an RZJBL Mfii or RZ25 Digk Drive .............

Separating the Support Plate from an RZ23L or an RZ24

o\ 2 - N

3~11

3+ L7

3-12
3-14
3-16

3.3.2
333
3.4

3.4.1
3.4.2
3.4.3

MS44L Memory Module . . . ...........

Separating the Mounting Bracket from an RZ25 Disk

Setting the SCSI D on the Replacement Digk Drive.......
Removing the RX26 Diskette Drive Assembly .. ........
. ....
Remowng the RX26 FDI/SCSiBoard................ e

3-18

parating the RX26 Diskette Drive from the Mounting

Bret
BOATA .

-----------------------------------------

eeve

3-20

Removing aTZ30 Tape Drive . . . ... ... .. ... .. ittt
Separating the TZ30 Tape Drive from the Mounting
Bracket
35.2
Setting the SCSI ID on the Replacement TZ30 Tape
Drive
3.6
Removing a TZK10 Tape Drive
3.6.1
Separating the TZK10 Tape Drive from the Mounting
Bracket and Bezel Dress
3.6.2
Setting the SCSI ID of the Replacement TZK10 Tape
Drive
3.7
Removing the Drive-Mounting Shelf ......................
38
Removing the SCSICable ................
... ... ... ..
39
fiemmg the DSW41 Synchronous Communications Option . ..
3.9.1
Removing the DSW41 LogicBoard ....................
3.9.2
R@mowng the DSW41 Input/Output Cable . .............
393
Removing the DSW41 Input/Output Module . ............
3.1¢
Removing the DHW41 Asynchronous Communications
L T+ O
N
3.10.1
Removing the DHW41 Logic Board
3.10.2
Removing the DHWA41 Input/Output Cable

322

3.10.3

342

3.5
35.1

-----------------------------------------

-------------------------------------------

--------------------------

----------------------------

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

3.12
3.13

Removing the DHW41 Input/Output Modufle;

Removing the CPU Module
Replacing the CPU Module
Removing the Power Supply Unit

. .

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

3-24

3-25
326
3-28
3-30
331
3-36
3-36
3-37

3-41

347
3-49

EnclosureBA4Z-A =

..D..iMos.d.ut.l.er..Ci..PbU...uK..CAto.4.n.5i..etco.hte..n.r.oTsn.earC.nmoodin.ntPaeolcrt.Cosor,n.ssInoED.dilxsepct.artncih.obseruist.Coi,enonCnM.oneeSPtcmirotgowinlrenasyrgl, 2-1~-35342

L...M..U.o.....n..dtouU.....i.nlC...ioDe....ttni..s..SL.ke.oyDc.cRrsot..aiZcDot.v.are2ri..etoim5..LnivDs..ooteti.nh.hsDse.p.eW.PkiCbi.Wtosf.aPr.t.ikwrBcehrUToekAe..R.emJr4t.ZfEuJC2Bh.2mtmuo-eriho.5pmaAr.nem..oCcepEodarnkPrretUMvelcCrnRoatIetli.ZdrDInMoet2TSuDEsoS4hlStnuS,CiaSechrny.nSCplRestMdWIoSZSiaeiroIt2yDnsrmuh3rgdDt.reoLMirert,ovtiihnehydtvmaeehueFDnReTlC.StiDuoRehsiU.mnrpekesgMsoanmS.keRrvioyMacDmZRinvsttr2oZnigtjiii3r2gnOeonvL45yagegnrmg 3-33321---~9635074572861
..0..t..EBntAc4l2o.-sAu.rCtoh.nBeAe.i4n2t.sC-oA.mTbt.ihenya.iAtnci.Ooepn.st.oDB.ren.Avs.i4aC.c2ne.o-d.mAS.mUDt.unoiirmBtaaecgcnSaelsytoMisisaotousnenrsmse 112-=-671
.....

=11

Removing an RX26 Digkette Drive.

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

3-18

3-12

Removing the RX26 FDU/SCSIBoard...................

3-19

3-13

Separating the Mounting Bracket from the R¥X26 Diskette
)

3-14

3-20

Location of the SCSI ID Switches on the szfi FDI/SCSI
Board . . . ...

3-21

How to Reach the SCSI ID Switches on the RX26 FDI/SCSI
Board .. ...
i
e et e
e

3-22

3-16

Removinga TZ30Tape Drive. ... .....................

3-23

3-17

Separating the Mounting Bracket from the TZ30 Tape

315

DFIVE ...

et e

3-18
3-19

3~25

3-26
3-27

3-20

3-29

3-21

Location of the SCSI ID Jumper Wires on the TZK10 Tepe
Drive ...

e e

3-22

Remeoving the Drive-Mounting Shelf ...................

3-23
3-24

Disconnecting the SCSICable ........................
Releasing the SCSICableClamp . .....................

325

Removing the DSW41 LogicBoard

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

337

3-26
3-27

Removing the DSW41 Input/Output Cable ..............
Removing the DSW41 Input/Qutput Module ... ..........

3-38

3-28

Removing the DHW41 LogicBoard ..... ..............

3-39
341

329

Removing the DHW41 Input/Output Cable . .............

3-42

3-30
3-31
3-32
3-33
3-34

Removing the DHW41 Input/Ouiput todule .. .. ......
...
Disconnecting the Cables from the CPU Module ..........
Removing the CPU Module ..... et
Location and Orientation of the Ethernet IDROM ........
Removing the Power Supply Unit .....................

3-43
3-44
3-46
3-48
3-50

Pin Specifications for the Ports on the BA42-A System . . ...

Functions of the Controls, Indicators, Ports, and
O

Y= e 7 - A

Power Supply Unitde Qutputs ....................
...
Memory Configurations for the Model 30 System ...

.....

BA42-A Communications Options . ....................
DEW41-AA Communications Interface Support .. .........
BA42-A Mass Storage Devices . .......................
Temperature, Humidity, and Altitude Remges ............
BA42-A Electrical Requirements ................
.....

Asynchronous Port A Pin Specifications for the Eight-Data
Line Option ........ ...ttt ittty

Asynchronous Port A Pin Specifications for the Four-Modem
Comtrol Line Option . . ... ... ... ... ... ..
v,

Pin Specifications for Synchronous Port 0 ............
...

A-5

Pin Specifications for the External SCSI Connector........

A-B

Recommended Spare Parts. . .................c.vn...

B-1

vii

Page viii

a blank page
%

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

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

ucture of This Manual
This manual is divided into three chapters, two appendixss, a glossary, and an
index:
e

Chapter 1 provides an overview of the system enclosure and describes
the controls, mass storage areas and capacity, signal distribution, power
distribution, input and output connections, and configuration guidelines.
Chapter 2 provides site preparation information and describes how to
install the systems that use the enclosure.

Chapter 2 provides instructions on removing and -eplacing FRUs.

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

Appendix B gives a list of the recommended spare parts.
ocu

The following documents contain additional maintenance information for
BA42-A enclosure systems:

QGuide to MicroVAXTM 3100 Platforva Maintenance Information Kit,
EK-A0512-MG

KA4S5 CPU Systemn Maintennnce, EK-A0513-MG

(CPU Refersnce Information, EK-A0574-HR

Options, EK-A0519-MG

suments
The following documents contain more information about MicroVAX 3100
platform systems:
®

MicroVAX 3100 Model 30 Cover Letter, EK-A0515-CL

MicroVAX 3100 Model 30 Installation Information, EK-A0520-IN

MicroVAX 3100 Mcdel 30 Operator Information, EK-A0521-UG

MicroVAX 3100 Model 30 Customer Technical Information, EK-A0522-TD

MicroVAX 3100 Model 30 Troubleshooting and Diagnostic Information,
EK-A0516-TM

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

nventions
The following conventions are used in this manual:
Conventich

Deweription

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

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

italic type

Italic type emphasizes important information, indicates variebles,
end indicates the complete titles of manuals.

boldface type

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

RE RRAR.BRR RN

n.nn

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

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

Note

A note contains information of special importance to the reader.

Caution

4 caution contsins information to prevent damage o the equipment.

HANHK

SOONEONNNOCNON0N00NIKKIKY

nclosure

Descrip

This chapter describes the BA42-A enclosure. It gives information on the
following:
o

Mass storage device areas

(Controls, indicators, ports, and connectors

Power and signal distribution

Air circulation

Configuration guidelines

The BA42-A enclosure houses the system unit of the MicroVAX 3100 Model 30
system. It is a desktop style enclosure (see Figure 1-1).

Enclosure Description

1-1

closu

Figure -1 BA42-A Enclosure

RE_EN0G257A_D1

42 Enclosure Description

Enclosure Description

s Storage

Device Areas

The BA42-A enclosure can contain 3.5 inch (13.5 c¢m) and 5.25 inch (20.25 c¢m)
half-height mass storage devices. These mass storage devices are mounted
on a drive-mounting shelf. The drive-mounting shelf can contain one, two,
or three devices. The orientation of the devices depends on the number of
drives you install. See Section 1.5.3 for information about mass storage device
combinations and orientation.

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

2k Ports {0,1.3)

Asynchronous fodem
Conwol Port (2)

Power OK Indicator (POIK)

O
RE_ENOE258A

-4 Enclosure D

Enclosure Deseripticn

e i-1

Functions of the Controls, indicators, Ports, and Conneciors
Dageription

On/Off switch

System ac power socket

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

QOn (|)-—Applies the ac power to the system unit

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

A sorket for the ac power input.
4 port that allows you %0 . onnect external SCSI devices.

Synchronous commun-

A port that provides for the connection of a device with

Asynchronous commun-

A port that provides one of the following two asynchronous

ications port 02

ications port A®

synchronous communications support.
communications expansion options:

[Eight DEC423 compatible asynchronous ports

Four EIA-232 compatible modem ports

MPMJ® port 0

DEC423 compatible agynchronous port. This port is the
primary console port.

MMJ port 1

DEC423 compatible asynchronous port.

MMJ port 3

DEC423 compatible asynchronous port. This port functions

as an alternate console port when the breal/enable switch
is set in the up position when you turn on the gystem unit.

Asynchronous modem
control port (2)

EIA-232 compatible agynchronous port with modem control.

Halt push button

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

'Small computer system interfece (SCSD).

2Optional ports that depend on the system configuration.
*Modified modular jack (MMJ).
(continued on nert page)

Enclosure Description

1-8

metions of the Controls, indicators, Poris, and Connactors
8 V de indicator

A green LED indicator that indicates the status of the 9 V
de power circuit as follows:
®

On—indicates 9 V dc power circuit is operational

]

Off—indicates 9 V dc power circuit is not operational
This indicator is mounted in the power supply. It can
be viiewed throught the grill in the chassis of the power
supply.

Enclosure Description,

1=7

i Distribution
The power supply unit (H7083) provides power to all the units in the enclogure,
¢t accepts aliernating current (ac) input voltage in the ranges 100 V ac to 120

YV ac (88 V rms! to 132 V rms) and 220 V ac to 240 V ac (176 V rms to 264 V
TIRS).

regulators in the power supply unit maintain the correct direct current

(de) mmt voltages, which are independent of the fluctuationsin the ac

input power. The power supply unit can provide a continuous power output
of 122 watts (W). The power supply unit has two internal, variable speed,
asutomatically adjusting fans that cool the unut while it operates. Table 1-2
gives the current specification= of the de circuits.
r Supply Unit de Ouwlputs
Output Current Range (de)

iinimum

iBeximum

(R)

(&)

+5.1

3.0

14.5

+12.1

0.0

5.0

-12.0

0.0

0.5

8.0

0.0

! Arnperes (A).
The power supply unit (E7083) has the following output connectors:
°

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

A flying lead connector that provides the dc power to the mass storage
devices in the BA42-A enclosure.
]

Figure 1-3 shows the power cabl

es in the BA42-A enclosure.

0 Hamess

(17-03017-01)

- [ive ffount

Shel

System with Two Drives

Not Used

CPU ¥

de Harness
Cable
(17-08017-01)

Additona:

Connecior
for AX26

- {rive Mount

Shetf

Systam with Three Drives
Noto.

BZ2 denotes RZ23L, RZ24, or RZ25 disk drivas.

Enclosure Description

1-9

Appendix A provides information on the pin specifications for the connectors.
The CPUJ module is the main source for signal distribution in & BA42-A
enclogure system. The SCSI cable is connected to the CPU module. Each
of the other connectors on the SCSI cable has a pull-tab. Use the pull-tab
to disconnect the cable from a SCSI device. Each pull-tab has a number
that identifies the drive to which the SCSI cable connector is connected (see

1-1@

Enclosure Descrigtio

Figure 1-4 Signal Distribution

Intemal STS| =

Extomnal
8Csi

Synchronous
Bn Oum

2~01)

A&ynchmmus
!

—01)

Power

Supply

- SCSI Cable

(17-03015-01)

TZK10
ar
RX26

Rzz

nggfi Mounting

System with Two Drives “————— Not Used
Intemal SCSI

CPU Module .._,_‘_._\

Paw«@r

Supply

Scsi

Synchronous

In Oumm

Asyndwmm

\ (17-02844-01) (17-02842-01) (17-02842-01)
f

i___k E

e’ B tstmeiinuis|

Sl LS

e SCS1 Cable

(17-0302
01)

Rzz

Rzz°
e Drive Wount

Shalf

System with Three Drives
Now:

RZZ° denptes RZ23L, RZ24, or RZ25 disk drives.

RE_ENOGES 04_9%

Enclosure Description

-1

Circulation
The power supply unit (H7083) contains two fans. Thes: fans provide the air
cirenlation for the enclosure. The fans adjust thei. speed automatically as the
temperature of the system unit changes. The air intake is on the right side
of the BA42-A enclosure (when viewed from the front), and the air exhaust is
on the left side. A typical value of airflow is 0.0104 cubic meters per second
{m¥sec) (22 cubic feet per minute {ft%min]).
figuration Guidelines

The combination of memory, communications optione, and interna. masc
storage devices determines the configuration of a system. See the KA45 CPU
System Maintenance manual for a list of the external mass storage devices that
a MicroVAX 3100 platform system supports.

1.5.1
The basic system memory is 8M bytes. This memory is permanently fixed to
the CPU module. You can expand the system memory in 8M-byte increments
by adding MS44-BA or MS44L-BA memory options. Eacl: MS44-BA memory
option consgists of two MS44-AA (4M-byte) memory modules. Each MS44LBA memory option consists of two MS441-AA (4M-byte) memory modules.
Table 1-3 lists the memory configurations. Figure i-5 shows the lucation of
the memory expansion connectors on the CPU module.
Table 1-3

WMemory Configurations for the Model 30 System

Total

incroment 1

Incrament 2

94?

incremaont 3

MS44-AA

Miag-AA

16M

MS44-AA%

MBads-AA

240

BAS44-AA

MS44-A4

BiS44-AL

MB44-AA

2h4

MSas-44

MS44-AA

MS24-AA

MS44-.AA

Y18, 1L, 2H, 2L, 3H, 3L ere connector identifiers (sec Figure 1-5).
2The MS44-AA memory module is a 4M-byte memory module. Each M544-BA neomory option

consists of two MS44-AA memory modules. You can use MS44L-AA memory modules in place of
RMiS44-AA mermory modules.

1-12

Enclosure Description

he KA45 CPU

Figure 1-5
3L\\
'

1.5.2 Commun

tions Options

Table 14 lisis the commmunications options that a BA42-A enclosure system
€an contain.

Taisle 1-4

BA42-A Communications Options

stion [ame

Description

Asynchronous Optiens

DHW41.A4

Provides eight DEC423 asynchronous lines

DHW4¢1-BA

Provides four E1A.232 asynchronous lines

Synchronous Options

DSW41-a4"

Provides one E1A-232/V.24 synchronous line

{This option is supplied with an external cable that supports the EIA-232/V.24 interface.

Enclosure Deseription

1-12

scription

‘The [38W41-AA option also supports the communications interfaces listed in
Teble 1-5, but you must order the external cable separately.
Table -5 DEW41-AA Communications interface Suppon
Communiestions Intarface

External Cable

ElA-423/V10

BC18E-02

Ela-422/V.11

BC198B-02

All the communications options fit into the BA42-A enclosure in the same
manner (see Figure 1-6). Each option contains three FRUs that are installed
in the enclosure as follows:
°

A ogic board

The logic board connects directly to the CPU module.

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

An input/output module

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

1=14

Enclosure Desoristion

DEW41 input/Output Module

DSW41 input/Output Cable
DSW41 Logic Board

DHW41 Input/Output Module

DHWA41 input/Output Cable
DHW41 Logic Board
RE_ENDS262A_O1

Endlosure Description

1-15

Table 1-6 lists the mass storage devices that a BA42-A enclosure system can
contain.

Capaclty

RZ23L

Disk drive

120M tytes

RZ24

Disk drive

200M bytes

RZ25

Diek drive

400M bytes

TZ30?

Tape drive

525

95-Mbyte cartridge

TZK10?

Tape drive

5.25

Range of cartridges®

RX26°

Digkette drive

Range of diskettes*

!Size of half-height device.

2Removable media devies.
SSupports 320-Mbyte and 525-Mbyte cartridges.
“Supports 1.4-Mbyte and 2.8-Mbyte digkettes.
The BA42-A enclosure has a drive-mounting shelf for mass storage devices.
The drive-mounting shelf provides two compartments for mass storage devices.
The right compartment (when viewed from the front) can contain one device.
The left compartment can contain one or two devices depending on the type of

the device in the right compartment. The crientation of the devices depends
on the number of devices that the system includes. Figure 1-7 shows the
combinations of mass storage devices in a2 BA42-A enclosure.

Enclosure Desc riptien

Drive-Mounting Shelf

Note:

RZ2" denotss RZ23L, RZ24, or RZ25 disk drives.
RE_EM0B2638_81

Enclosure Description

1-17

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

Preparing the site

Unpacking the system

[Installing a BA42-A system

paring the Site
Before you unpack the BA42-A systemn:, verify the physical, environmental, and
electrical requirements described in this section.

2.1.1

Dimensions
Figure 2-1 shows the dimensions of the BA42-A enclosure.
Caution

The container and er.closure together typically weigh 16.5 kilograms
(kg) (36 pounds [Ib]). Two people are required to handle the container.

Instailation

2-1

45.38 em
{(18.26 in)

RE_EN0S264A_D1

The dimeneions of the container ave as follows:
e

Height = 30.6 cm (12.0 inches)

Width = 61.1 cm (24.0 inches)

Depth = 51.0 em (20.0 inches)

2.1.2 Additional Equipment

When you are installing additional equipment, follow these guidelines:
Make sure that there is sufficient spece for the terminals and other
peripheral equipment.

Make sure that you keep the mass storage devices in an area that has the

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

same temperature and humidity as the computer area (see Table 2-1).
install the cables before you install the system.

2-2

Inztaliztion

instaliation

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

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

Do not place 2 system near heating or cooling devices, large windows, or
doors that open to the outside. Rapid changes of temperature can affect
the performance of the system.

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

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

Maintain a relative humidity level of at least 40%.

Place the system away from busy corridors.

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

A BA42-A enclosure system typically dissipates heat at the rate of 340 British
thermal units/hour (Btu/h).

sre, Humidity, eand Altitude Ranges
Table 2-1 gives the sperating, nonoperating, and storage ranges for the
temperature, humidity, and altitude for BA42-A enclosure systems.

installation

2-3

re, Humww, and Altitude Ranges
Temperature

10°C to 40°C

40°C w0 66°C

5°C to 60°C

(50°F ¢o 104°F)

(-40°F to 151°F)

(41°F to 122°F)

Relative
humidity?

10% to 90%

10% to 95%°

i0% to 95%

Altituds

2400 m maximum

4900 in meaximum

(8000 ft maximum)

(16 000 ft maximum)

Rate of change
of tamperature

11°C per hour
mazimum

(20°F per hour

marimum)

YFor operation above eea level, decrease the operaiing temperatare by 1.6°C per 1000 m (or 1°F

ser 1000 ).

2At o temperature of 85°C.

2.1.7 Electrical Reguirements
The power source to which the system connects must be capsble of providing

power o the system unit and any other additional equipment, such as local
terminals and expansion boxes. DigitalTM recommends that each system:
operates in a dedicated power circuit. Additional power equipment may
be required to avoid power interruptions. Table 2-2 lists the electrical
requirements of systems in BA42-A enclosures. The power supply unit in

the system is autosensing. You do not have to select the input voltage.

incaiistion

instaliation

110 V ac or 220 V ac

100 V ac 0 120 V ac (88 V rms! to0 132 V rms) and

220 V ar to 240 V ac (176 V rms to 264 V rms)
Power cource phase

Single

Nominal frequencies

50 Hz? or 60 He

Fregueney ranes

47 Hz to 63 Hz

Meadmum running current

1.0
A for 110
V ac systems and 0.5 A for 280 V ac
gystems

Steady state current

0.8 A for 110 V ac systems and 0.4 A for 220 V ze
gystems

Meximum inrush current

Maximum power consumption

100 W

YRoot mean square (ruws).

®Hertz (Hz).

2.2 Unpacking the System
Open the container. Remove the box and the accessory tray. The box contains

the system unit. The accessory tray contains the following:
o

Customer Hardware Information Kit

VMS Factory Installed Software User Guide

Software licenses

Power cord

Other accessories

Expansion box:s are supplied in separate containers.

installation

2-5

?I:;.

lal T

rnWes
T-Loimedioi

HS232 to
DEC423 Adapter

and Two Tenminators

Power Cord

Decumentation and
RE_ENDS265A
&1

Depending on the system configuration, the contents of the container may
differ from the items shown in Figure 2-2. When unpacking the system, do the
following:
1.

Check the contents of the container against the packing slip.

Store the unused parts for future uge. Depending on how you set up the
system, you may not use all the components supplied with the system.

Always repack the system umit in its eriginal packing material when moving or

relocating the systemn. This precaution protects the system from damage.

2-§

Ingtailation

insiaiiation

Install ihe BA42-A encicsure according to the instructions in the following
subsgections.

2.3.1

Plecing the BA42-A En
After you unpack the system, move the BA42-A enclosure to the location from
which it will operate. Place the enclosure so that it satisfies the following space
requirernents:

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

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

Allow 20 em (8 inches approximately) of clearance on the front of the

enclosure so that you can reach the rumovable media devices, depending on
the system configuration.

fying the Ports and Connectors on the System Unit
Figure 1-2 shows the ports and connectors in a BA42-A enclosure system.

Section 1.2 describes the functions of the controls, indicetors, ports, and
connectors in 28 BA42-A enclosurs system.

2.3.3 Connecting the Console Terminal to the System Unit
To connect a console terminal to a BA42-A enclosure system, follow these steps:

DMake sure that the on/off switch on the terminalis in the off position.

Set the communication parameters of the terminal (see Table 2-3).

Festure

Setiing

Terminal mode

VTrnn-7bit

Trenemit speed

2600 baud

Receive speed

receive = transmit

Character format

8 bits, no parity

Stop bits

Coamm] port

DEC-423 (data-leads-only !

instaliation

2=7

See the terminal documentation if you want mere information on setting
up the terminal.
Note

If you connect the terminal cable to oue of the MMJ ports on the back
af a VI3xs terminal, you must set the port so that it can operate as a
EC42) port. See the terminal documentation for more informstion.

C@fimect the terminal cable supplied with the system (see Figure 2-2) to
MM.J port 3 on the back of the system unit (see Figure 2-3). Connect the
other end -f the terminal ecable to a DEC423 port on the terminal.

4. [If the terminal has EIA-232 ports only, connect the EIA-232 to DEC423
adapter to the EIA-232 port on the terminal; then connect the terminal
cable to the EIA-232 to DEC423 adapter.
Note

Some terminal cables have an earth drain wire. You must connect this
earth drain wire to the grounding pillar above MMJ port 1, using the
screw provided with the cable.

insialistion

instaliation

Grounding Piliar
Terminal Cable

81
RE_ENDBZEGA

insteliation 2-9

234 Con

ng the ThinWire Terminator or Loopback Connecior

You can connect a BA42-A enclosure system (o either a ThinWire Ethernet
netwerk or a standard Ethernet network. To test the Ethernet circuitry in
the system unit before you connect £o a network, install either the ThinWire
terminator or the standard Ethernet lcopback connector.
The ThinWire terminator and the standard Ethernet loopback connector are
supplied with BA42-A systems (see Figure 2-2). The ThinWire terminator
congists of a2 T-connector and two terminators. The standard Ethernet loopback
connector is a single unit.
ous ehoose the network type using the Ethernet switch on the back of the
¢+ - temn unit (seeFigure 1-2). The switch settings for the network typee are as
v

Lefl position—standard Ethernet

Right position—-ThinWire Ethernet

When yon want to use & ThinWire Ethernet network, follow these steps:
i.

Set the Ethernet switch to the right position.

To form a ThinWire terminator, connect the two terminators (see
Figure 2-4) to the T-connector.

Connect the ThinWire terminator to the ThinWire Ethernet port on the
back of the system unit turning the barrel connector clockwise until it locks
(see Figure 2-4).

Terminaiorns

T-Connacior

2-11

Ethernet network, follow these steps:

Set the Ethernet switch to the left position.

Connect the standard Ethernet loopback connector to the standard
Ethernet port on the back of the system unit (see Figure 2-5).

TM
82_ENDE2ERA_

£.3.8 Connecting the System Unit Power Cord
A DAAZ A encluzure evstem cocents 200 V ac to120 V ac at 50 Hz or 6C Koz, or
220 V ac to 24¢ V ac at 50 Hz or 42 - The power suprly unit 15 s<if-senging.
Yoo %3 9t e=ve o gewct (ke irsat voltage.
. ceprect the systen. unit power
cord, follow thes. uiv s

@=9%

Inrvtatdion

fnstaliation

1. St the on/off switch on the back of the system unit to the off (O) position.
e 2-2), to the
2 Connect the power cor ], cupnlied with the system (see Figur
e 2-6).
ac power socket on the back of the gystem unit (see Figur
3. Connect the other end of the power cord to a grounded power outlet.
Figure 2-6 Connecting the System Unit Power Cord

Power Cord

RE_ENOE27T0A_9Y

Installation 2-13

236 Turning On the System
b turT on the system, follow these steps:

ition.

1. Set the on/off switch on the terminal to the on pos

ition (see

9. Set the on/off switch on the system unit to the on ( 1) pos
Figure 2-7).

Figure 2-7 Tuming On the System Unit
On/Off Switch

AE_ENGS271A_B1

Maintenance manual for information about the
See the KA45 CPU Sysntem
you turn on the system.
self-tests that run whe

2-14 Ingtallation

ig and Replacing FRUs
This chapter deseribes how to remove and replace the FRUs in the BA42-A
enclosure. It gives information on the following:
¢

Removing the enclosure cover

Removing an MS44 or MS44L memory module

Removing an RZ23L, RZ24, or RZ25 disk drive from the drive-mounting
shelf

Removing an RX26 diskette drive assembly

Removing a TZ30 tape drive

Removing a TZK10 tape drive

Removing the drive-mounting shelf

Removing the SCSI cable ciamp

Removing a DSW41 synchronous communicstions option

Removing a DHW41 asynchronous communications option

Removing the CPU module

Replacing the CPU module

Removing the power supply unit
Note

Unless otherwise specified, you can replace an FRU by reversing the
steps described in the remnoval procedure.

Removing and Replacing FRUs 3-1

Table 51 lists the major FRUsin the BA42-A enclosure. It also gives the

" .order mumbers for the FRUs and a reference to a section in this chapter that

gives information on how to replace the FRU. See the Options manual for more
information about options. Appendix B gives a complete list of the spare parts
for the BA42-A enclosure. Figure 3-1 shows the locations of the major FRUs
in the BA42-A enclosure.

Only qualified personnel should remove or install the FRUs.

Before you remove or install the FRUs, turn off the system unit
and disconnect the power cord.

Static elecmfity can damage integrated circuits. Wear a wrist
strapand place an antistatic mat under the gystem unit when
working wmh the mnternal parts of the system unit.

You must have thefollowing tools to repiace the FRUs in a MicroVAX 3i0.
Model 30 system:
e

A number 1, Philips screwdriver

A flat serewdriver

Removing and Replacing FRUSs

t FRUs In the BAqZ2-A Enclogure

FRY

Order Numbers

Section

Memory medule

MS44-AA MS44L-AA

Diek drive

RZ28L-5

4.3

Digk drive

RZ24-E

3.3

Disk drive

RZ25-E

3.3

Digkette drive

RX26-AA

8.4

Tape drive

TZ30-AX

8.5

Tape drive

TZK10-AA

3.6

Synchronous communications option

DSW41-AA

3.9

Asynchronous communications option

DHW41-AA, -BA

3.10

KA45 CPU module

64-20654-01

.11

Power supply unit

H7088-AA

3.13

Removing and Replacing FRUs 3-3

RZz" D

isk Dri

ves ~

Drive

Mount

ing Sh

ell

t
2

)

DSWA41

E@W&

’w

- 04

544

DHW41 In

DHVY1
DHW

putOutput

InputOu

41 L

agic

tput

Board

Module

—

sving and Replacing FRUs

3.1

To remove the enclosure cover, follow these steps:

1. Set the on/off switch on the system unit to the off (O) position.
are
9. Disconnect the cables, loopback connectors, and terminators that
connected to the system unit.

3. Loosen the two).captive screws (12-30538-05) on the back of the system unit
(see Figure 3-2

4. Slhide the cover forward and lift it up from the system unit.
Flgure 3-2

oving the Enclogure Cover

Enclozure Cover

[ P

om0

. gwEmaB_

M @

i @
To remove an b
1.

L Memory

Module

44 or MS44L memervy module, follow thuse steps:

Remove the enclosure cover (see Section 3.1).

lon

)

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

Locate the faulty memory module. Figure 3-3 shows the location of the
memory medule connectors on the CPU module.

Removing and Rep!

Remaving and Repiscing FRUs

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

You may have to remove one or two memory modules to reach

the faulty memory module. Note carefully the position of each
memory moedule you remove.

Removing and Replacing FRUs 3-7

Push the metal board clips on the memory module connector away from the

cemter. Tilt the memory module towards the back of the enclosure, and Lift
the memory module out of its connector (see Figure 3-4).

When instailing en MS44L memory module, note that the connectors

on the CPU module are keyed so that you cannot install the MS44L
memory module with an incorrect orientation. Do not try to force a
module into a connector with an ineorrect orientation.

FRUs

FE_ENDZ2DIA_91

Disk Drive
en the system configuration, the drive-mounting shelfin the

BAAZ-A @nclaswe can contain RZ23L, RZ24, or RZ25 disk drivesin the left

and right compartments, when viewed from the front. The orientation of the
dizk drives in the left compartment depends on the type of device in the right
artment (see Section 1.5). You can remove a disk drive from the enclosure
without removing the drive-mounting shelf. To remove an RZ23L, an RZ24, or
an RZ25 digk drive from the BA42-A enclosure, follow these steps:
1.

Remove the enclosure cover (see Section 3.1).
Note

Y@u can disconnect the cables from a digk drive move easily

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

after you remove the disk drive from the drive-mounting shelf.

Press and hold the spring clip that lecks the disk drive in position.

Push the disk drive towards the spring clip until the rubber grommets
under the digk drive release from the cutouts in the drive-mounting shelf
Figure 3-5). Lift the disk drive up from the drive-mounting shelf and
release the spring clip.

2724 Disk Drive

RE_EMNOB274A_

Disconnect the SCSI cable from the back of the digk drive by pulling the
pull-tab.
re 1-4 shows the signal cables in the BA42-A enclosure.

Disconnect the power cable from the back of the disk drive. Figure 1-3
shows the power cgbles in the BA42-A enclosure.

3.3.1

support plate {(17-€41364-01) and the rubber grommets (12-31734-01), which are
attached to the faunity disk drive (RZ23L-E or RZ24-E), and install these items
on the replecement drive. The following precedure describes how to remove the
gupport plate and rubber grommets from an RZ23L disk drive. The procedure
for removing the support plate and rubber grommets from an RZ24 digk drive
is the same. To remove the support plate and rubber grommets from an RZZ3L
digk drive, follow these steps:

Pogition the digk drive eo

drive faces up.

2. E@m@w the fi‘@m gerews end the attached grommets (see Figure $-8).

RE_ENDBLS1A_B

Remove the support plate from the disk drive.

Keepthe four screws with the atteched grommets and the support platein

a afife place. You must install them on the replacement disk drive.

rating &

unting Bracist from an RZ25 Disk Drive

When you are replacing an RZ25 disk drive, you must remove the mounting
bracket (74-44226-01) and the rubber grommets (12-31734-01), which are
attached to the faulty disk drive (RZ25-E), end install these items on the
replacement drive. To remove the mounting bracket and rubber grommets
from an RZ25 disk drive, follow these steps:

=12

Position the disk drive so that the bettom of the disk drive faces up.

Removing and Replacing FRUs

Remove the four 2crews and the attachel promm

ets (see Figure 3-7).

These serews secuve the mourting bracket 2o the disk drive.
3 3-7

Crommsts (4)

Mounting

Bracket

w X

RZ25 Disk Drive

RE_ENDB4STC_01

Remove the mounting bracket from the disk drive.

Keep the four screws with the attached grommets and
the mounting
bracket in a safe place. You must install them on the replac
ement disk
drive.

Removing and Replacing FRUs

3-13

epiacing FRUs

SCSI ID on the Replacement Disk Drive

To set &he SPSE ID on a replacement disk drive, follow these steps:

Note the SCSI ID switch settings on the disk drive you removed. The
locations of the SCSI ID jumper wires on the various types of disk drive
are shown in the following figures:

RZ23L—see Figure 3-8

RZ24—see Figure 3-9

RZ25—see Figure 3-10

Set the SCSI ID switches on the replacement disk drive to the same
settings as the SCSI ID switches of the disk drive you removed.

Figure 3-8 R

RE_EN0B357A_B1

2-14

Removing and Replacing FRUs

4 Disk Drive SCSI 1D Jumpsr Wire Locatlons

SC8I € :nnecior

ECSI 1D Jumper
Wises

Power Connactior

Removing and Replac,

FRUs

3-15

nig FRUS

Flgure 3-10 &

Brive SCSI 1D Jumper Wire Locat

RE_ENGS385C_91

we the Options manual for more information about setting the SCSI ID of the
RZ23L, RZ24, and RZ25 disk drives.

OvVingG
2y

6 Diskette Drive Asgsembly

The RX26 diskette drive assembly (when installed)is on the right side of the
drive-mounting shelf when viewed from the front. The RX26 diskette drive
assembly contains three FRU: as follows:
RX26-AA diskette drive

RX%6 FDI/SCSI board (54-20764-02)
R¥X26 ribbon cable (17-00285-00)

plecing FRUS

To remove the RX26 diskette drive assembly from the BA42-A enclosure, follow
these steps:
1.

Remove the enclosure cover (see Section 3.1).
Kote

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

Disconnect the power cable from the back of the RX26 disketts drive.
Figure 1-3 shows the power cables in the BA42-A enclosure.

Disconnect the power cable from the floppy diskette interface/small
computer system interface (FDI/SCSI) board.

Disconnect the SCSI cable from the back of the FDI/SCSI board by pulling

the pull-tab. Figure 1-4 shows the signal cables in the BA42-A enclosure.
5.

Loosen the captive screw that secures the mounting bracket to the
drive-mounting shelf (see Figure 3-11).

Flgure 3-11

RE_ENDE27SA_N

Lift the left side of the RX26 diskette drive assembly and pull the diskette
drive assembly to the left until the tabs on the right side of the mounting
bracket are clear of the cutouts in the drive-mounting shelf.
q.

Lift the RX26 diskette drive assembly out of the BA42-A enclosure.

7o remove the FDI/SCSI board from the RX26 mounting bracket, follow these
steps:
’
1.

ibbon cable that connects the R¥26 diskette drive to the
scozmeet the rif

Turn the RX26 diskette drive assembly over so that the base of the

mounting bracket faces up.

318 Removing and &

Bemavinz and Replacing FRUs

3. Press firmly on the front edge of the FDI/SCEI board with your finger.

When the two holes on the front edge of the FDI/SCSI board are clear of
the tebs in the RX26 mounting bracket, slide the RX26 FDI/SCSI board out
of the RX26 mounting bracket (see Figure 3-12).

Flgure 3-12 ¢

RX26 FDUSCS! B

/Hole in RX26 FDI Board (2)
ting the

3.4.2

RE_ENOS238A_01

RX26 Diskette Drive from the Mounting Bracket

When you are installing a replacement RX26 diskette drive, vou must use the
mounting bracket (70-29669-01) that is attached to the faulty RX26 diskette
drive (RX26-AA). To separate the RX26 diskette drive from its mounting
bracket, follow these steps:
1.
2.

Remove the four screws (90-10961-03) that secure the RX26 mounting
bracket to the RX26 diskette drive.
Separate the mounting bracket from the RX26 diskette drive (see
Figure 3-13).

Hemoving and Replacing FRUs 3-18

Y28 Mmm%m Crmnlat

R¥X28 Diskstte Drive

FE_Eosesna
o1

34.3 Setting the SCSI ID on the Replace
When replacing the FDISCSI board, you must set the SCSI ID of the
replacement Loard to the SCSI ID of the board you removed. To set the
SCSI ID en a replacement RX26 FDI/SCSI board, follow these steps:
1.

Note the SCSI ID switch settings on the RX26 FDI/SCSI board you

removed. Figure 314 shows the location of the SCSI ID switches on the
FDI/BCSI board.

Set the SCSI ID switches on the replacement RX26 FDUSCSI board to the
same settings as the SCSI ID switches of the RX26 FDI/SCSI board you

removed,

Removing and Replacing FRUs

X25 FOVSC

Note: The SCSI 1D shown is 4 (S1 is on, S2 is off, and §3 is off).
RE_ENOSATIA_B1

3.5 Removing a T£30 Tape Drive
The TZ30 tape drive (when installed) is on the right side of the drive-mounting
ghelf, when viewed from the front. To remove a TZ30 tape drive from the
BA42-A enclosure, follow these steps:
1.

Remove the enclosure cover (see Section 3.1).

Removing and Replacing FRUs

Naote

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

When disconnecting the cables, you must note which cables

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

Looszen the captive screw that secures the mousiting bracket to the
drive-mounting shelf (see Figure 3-16).

Flgure 3-16

Removing a T230 Tape Drive

TZ30 Tape Drive
Cagptive Screw

RE_ENDE278A_91

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

Disconnect the power cable from the flying lead connector of the TZ30 tape
drive. Figure 1-3 shows the power cables in the BA42-A enclosure.

Disconnect the SCSI cable from the TZ30 tape drive by pulling the puli-tab.
Figure 1-4 shows the signal cables in the BA42-A enclosure.

Lift the TZ30 tape drive, which has its mounting bracket attached, out of
the system unit.

ating the TZ30 Tape Drive from the Mounting Bracket

3.5.1

Whaen you are instailing a replacement TZ30 tape drive, you must use the
mounting bracket (74-42115-01) that is attached to the faulty TZ30 tape drive
(TZ30-AA). To separate the mounting bracket from the faulty TZ30 tape drive,
follow these steps:
1.

Remove the two screws (90-09984-07) from the right side of the mounting
bracket (see Figure 3-17).

Remove one screw (80-09984-07) from the left side of the mounting bracket

Remove one screw (90-10961-03) from the bottom of the drive-mounting

Separate the mounting bracket from the TZ30 tape drive.

(see Figure 3-17).

B
RE_ENGRAZA

Keep the mounting bracket and the four screws in a safe place because you
install the replecement TZ30 tape drive.

To set fihe SCSI ID on the rep!amwt '1’230 tape dm, follow these stepu:
1.

Note the SCSI ID switch settings on the TZ30 tape drive you removad.

3-18 ghows the Becmwn of the SCSI ID switches end the
ded SCS! ID for tape drives.

5@?. the SCSI ID switches on the replacement TZ30 tape drive to the same

gettings as the SCSI ID switches on the TZ30 tape drive you removed.

g: 1. 81 is not used (ehvays on).

2 The SCBIIDchownis
5 (S2ison, S iz 0%, end S4 is on).
RE_ENgn2son
o

See the Optwm manual for more information about setting the SCSI ID of the

TZK10 tape drive (when installed)is on the right side of the drive-

mmm shelf, when viewed from the front. To remove a TZK10 tape drive

from the BA42-A enclosure, follow these steps:
1.

Remove the enclosure cover (see Section 3.1).

ing FRUs

Naote

You can disconnect the cables from the drive more easily after

you remove the drive from the drive-mounting shelf.
°

When you disconneci the cables, note which cables connect

to which drives. On the SCSI cable, note the number on the
connector pull-tab.

Loosen the captive screw that secures the mounting bracket to the

drive-mounting shelf (see Figure 3-19).
Figure 3-19

oving @ TZK10 Te

pe Drive

TZK10 Tape Drive
Captive Screw

AE_ENO08277A_81

Lift the left side of the TZK10 tape drive. Slide the TZK10 tape drive
to
the ieft until the tabs on the right side of the mounting bracket are clear
of
the cutouts in the drive-mounting shelf

Removing and Replacing FRUs

3-27

Disconnect the power cable from the back of the TZK10 tape drive.
Figure 1-3 shows the power cables in the BA42-A enclosure.

Disconnect the SCSI cable from the back of the TZK10 tape drive by pulling
the pull-tab. Figure 14 shows the signal cables in the BA42-A enclosure.

Lift the TZK10 tape drive, with its bracket attached, out of the system
unit.

rating the TZK10 Tape Drive from the Mounting Bracket and
el Dress

3.6.1

When you install a replacement TZK10 tape drive, you must use the mounting
bracket (74-42449-01) and bezel dress (74-42531-01) that are attached to the
faulty TZK10 tape drive (TZK10-AA). To separate the mounting bracket and
bezel dress from the faulty TZK10 tape drive, follow these steps:

3-28

Remove the four screws (90-10961-03) that secure the mounting bracket to
the TZK10 tape drive (see Figure 3-20).

Separate the mounting bracket from the TZK10 tape drive.

Removing and Replacing FRUs

racket from the TZK10 Tap

e Drive

w"‘

Philips Screws (4) -/

TZK10 Mounting Bracket

TZK10 Tape Drive

TZK10 Beze! Dress
{Madsl 30 only)
RE_ENGS4E5A_91

Unelip the bezel dresc (74-42631-01) from the TZK10 tape drive (see
Figure 3~20).

Keep the mounting bracket, the bezel dress, and the four screws in a safe
place because you must use them to install the replacement TZK10 tape
drive.
Note

When you attach the mounting bracket to the replacement TZK10 tape
drive, align the holes on the mounting bracket that are marked by a @
with the screw holes on the sides of the TZK .0 tape drive.
P

Removing and Replacing FRUs 3-29

SCSI ID of the Replacement TZK

To set the SCSI ID of the replacement TZK10 tape drive, follow these steps:
1.

Note the positions of the SCSI ID jumper wires on the back of the TZK10
tape drive you removed. Figure 3-21 shows the location of the SCSI ID
jumper wires and the recommended SCSI ID for tape drives.

Set the SCSI ID jumper wires on the replacement TZK10 tape drive to the
game positions as the SCSI ID jumper wires on the TZK10 tape drive you
Tennovea.

3-8

Removing and Replacing FRUs

ation of the

SCSI ID Jumper Wires on the TZK10 Tape Drive

| Note: The SCS! ID shown is 5.

O
RE_ENOE2408

See the Options manual for more information about setting the SCSI ID of the

TZEK10 tape drives.

3.7

woving the Drive-Mounting Shelf
The drive-mounting shelf provides the means of mounting the various

internal mass storage devices in the BA42-A enclosure. You must remove the
drive-mounting shelf to reach some FRUs.

Removing and HRepiacing FRUs 3-81

g FRUs

To remove the drive-mounting shelf, follow these steps:
1

Remove the enclosure cover (see Section 3.1).
Neote

You can remove the drive-mounting shelf with all the mass storage
devices attached, and without disconnecting the power cgble and SCSI
cable from the mags storage devices.

Disconnect the power cable from the flying lead connector of the power
supply unit. Figure 1-3 shows the power cables in the BA42-A enclosure.

s® .

AR. .

o i, s

i40sen wie three capiive

& s
2

screws (see Figure 3-22).

Drive Mounting Sheif

Philips Screws (2)
RE_ENDBZ78A_B1

Looszer the two screws (90-02284 £7; on the right of the enclosure (see

Slide the shelf forward as far as it goes (see Figure 3-23).

o1
RE_ENEIRTeA

6. Disconnect the SCSI cable from the CPU module (see Figure 3-23).
7. Lift the drive-mounting ehelf up from the enclosure and set it aside.
3.8

To remove the SCSI cable from the BA42.B enclosure, follow these steps:
1. Remove the drive mounting shelf (see Section 3.7).

9. Disconnect the SCSI cable from the mass storage devices on the drivemounting shelf.

3. Push the tab on the cable clamp (80-11237-01) (see Figure 3-24), and tilt
the cable clamp towards the back of the lower drive-mounting shelf.

384

Reomoving and Replacing

outschaehlfe.3td-rh2ie4v)e.l-iFmdioegaurntedin(9gs0e°thsteherilnofucdgurhtiocvuleta-imtopsufcnratboilmnegctlhaemepincdaslbcolatebtlhetRherlToeuagsmhe54.
3-3§FRUsReplacingandRemoving SheliMountingDrive

Communications
The D8W4l synchronous cominunications option contains three components
that you must remove from the system enclosure as follows:
e

A legic boar

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

An input/output module (70-28540-01)

To remove the DSW41 synchronous communications option from the BA42-A
enclosure, follow these steps:

3.9.1

Remove the enclosure cover (see Section 3.1).

Remove the drive-mounting shelf (see Section 3.7).

Remove the logic board, the input/output cable, and the input/output
medule according to the procedures in the following subsections.

moving the DEW41 Logic Board

Caution

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

Press the latch on one of the standoff pillars (see Figure 3-25) and push
up the corner of the DEW41 logic board until the DSWA41 logic board is
released.

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

ng and Replacing FRUs

Standofi Pillars (2)

01
RE_EN0S2224,

Press the latch on the other standoff pillar and push up the corner of the
DEW41 logic board until the DSW41 logic beard is released.

Pu@h up th@ DSW41 logic board until the connectors on the DSW41 logic
ngage from the connectors on the CPU module (see Figure 3-25).
Remove the DSW41 logic board from the enclosure.

3.9.2
‘Eb remove the DSW41 anput/output cahle, follow these steps:
1

flfigmnmct the DSW41 input/output cablefrom the CPU module (gsee

Dngmzmm the DSW41 input/output cable from the DSW41 input/output
module on the back of the enclosure (see Figure 3-26).

Removing and R

2.
€&

Remove the DSW41 input/output cable from the enclosure.

Flguse 3-&

DEWa %fimfif@m@ufi Module

3.9.3
To remove the DEW41 mp&a&/@u@mfi& m@m follow these steps:

nnect the external cable thatis connected to synchronous port 0 on
k of the system unit (if not already disconnected).
2.

Disconnect the DSW41 mm;wuw cabiz from the DSW41 input/output
le (if not already disconnected).

Press the spring clip on the DEW41 input/output module. Pull the DSW41
input/cutput module towards the front of the enclosure until it is released
from the back of the enclosure (zee Figure 3-27).

componentsthrecontainsoptioncommunicationsasynchronousDHW41e
(70-2fo8(l5740o1-w-2s0:815a)4s0m-ee0nd2cmu)lolomdesueuldirenues(pl:1use7ty-/is0ont2upe9tum4pt2u/t(-to5h0u4el1t-i)pf2nur0ect6oac6wmblo2linr-ent0eegri1modn)loapvbtumeosto-a/mdocrunudelstmypltou48gtyiocuA==n ¢°A

BA42-AthefromoptioncomunicationsasynchronousDHW41theve

puwsihtahnwdor3k-i2n8g)Fwihgeunreun(isteespyisltaermstshteanudnodfferthmeaotfaonnteisotantilcatacnhptlhaecPeraensd1.
steps:thesefollowe,

cpouimTsctarpholi-nwhbevtundetorsitf:ns lutcoDbiHnrpghWatesfir4ec1dl

tinherneal

nLoBWvteg4iahnr1cdg (ote3cSn.ecsvhlc1etsr)ieuor.n

DHW41 Logic Board

RE_ENOS285A_91

2. Press the latsh on the other standoff pillar and push up the corner of the
DHW41 logic board unti) the DHW41 logic board is released.

3. Push up the DHW41 logic board until the connectors on the DHW41 logic
board disengage from the connectors on the CPU module (see Figure 3-28).
4.

Remove the DHW41 legic board from ths enclosure.

Removing the DHW4E1 Input/Output Cable
To remove the DHWA41 input/output cable, follow these steps:

1. Disconnect the DHW41 input/output cable from the CPU module (see

Figure 3-29).

Disconnect the DHWA41 input/output cable from the DHW41 input/output
module on the back of the enclosure (see Figure 3-29).

Removing and Replacing FRUs 3-41

Flgure 3-29 Remaoving the DHW4Y input/C
DHW41 lnput/Quiput Module

DiHW41 InputQutput Cable

CPU Module

RE_ENOG286A_01

3.10.3 Removing the DHW41 Input/Cutput Module

To remove the DHW41 input/output module, follow these steps:

Disconnect the external cable that is connected to asynchronous port A on
the back of the system unit (if not already disconnected).
2. Disconnect the DHW41 input/output cable from the DHWA41 input/output
1.

module (if not already disconnected).

3. Press the spring clip on the DHW41 input/output medule. Pull the DHWA41

input/output medule towards the front of the enclosure until it is released
from the back of the enclosure (see Figure 3-30).

2-42 Removing and Replacing FRUs

Removing and Replacing FRUs

Lift up and remove the DHW 41 input/ortput module from the enclosure.

Floure 3-30

noving the DHWAT Input/Outpu

lule

Spring Clip
W41 Input/Output Module

99
RE_Eros207a_

3.11

oving the CPU

Module

To remove the CPU module from the BA42-A enclosure, follow these steps:
1.

Disconnect the external cables, loopback connectors, and terminators from
the back of the system unit.
Remove the enclosure cover (see Section 3.1).

Remove the drive-mounting shelf (see Section 3.7).
If installed, remove the DSW41 logic board (see Section 3.9.1) and
disronnect the DSW41 inpuvoutput cable from the CPU module (see
Section 3.2.2).

Removing and Replacing FRUs

3-43

3(saen-3d1m)3o..d1Fu0i.l1ge)urCoePn(USseetc.hme(osfderuolmbeocCarPbdlUeloitgini.pecufDtr/HooWumt4cpa1ubtlteDhepHoWrwe4em1rovttheheeiDndisitssaccloonned,eeccIttf68..
Dies3-31Figure

FRUsReplocingandRemoving3-84

Removing and Replacing FRUg

Disconnect the SCSI ribbon cable (17-02544-01) from the CPU module (see
Figure 3-31).

Caution

Engure that you do not damage any of the CPU module eomponents by
exerting too much force on the components.

Press the two spring clips (indicated by arrows in Figure 3-32) that secure
the CPU module in position. The CPU module moves forward under the
tension of the connector gaskets. If necessary, slide the CPU module back
until it disengages from the ten keyhole cutouts {see Figure 3-32).

Removing and Replacing FRUs 3-45

CPU Module

Keyhole Cutouts (10)

Ethernet ID ROM

Soring Clips

Samicircular Cutout

RE_ENOBZIOA_S1

Use your finger,in the semicircular cutout on the front edgeof the CPU
module, to lift up the front edge of the CPU medule (see E"‘afgum 3-32).

Removing and Replacing FRUs

10. While supporting the front of the CPU module with one hand, guide the
connectors on the back of the CPU module out of the corresponding cutouts
on the back of the enclosure.
. Remove the CPU module from the enclosure.

12. Carefully remcve the Ethernet ID ROM from the CPU module. You must
ingtall this ROM in the ranlasement CDIT mady:ls
AR

ISR

e wREBRT

3.12 Replacing the CPU Module
‘To install a replacement CPU module in a BA42-A enclosure, follow these
ateps:

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

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

Install the Ethernet ID ROM that you removed from the fauity CPU
module on the replacement CPU module. Figure 3-33 shows the location

and orientation of the Ethernet ID ROM.

Remaoving and Replacing FRUs 3-47

CPU Mogule

Pin‘l-[
\| Etheret iD ROM

Place the CPU module in the enelosure so that the connectors on the CPU
meodule align with the corresponding cutouts in the back of the enclosure.
Jse the ThinWire Ethernet port a: an anchor point to adjust the position
of the CPU module correctly.

Align the keyhole cutouts in the CPU module with the corresponding
standoff pillars on the base of the enclosure.

Ensure that you de not damage any of the CPU module components by

exerting pressure on the components.

Press the CPU mcdule at the two positions marked push. The spring clips
push the standoff pillars into the keyhole cutouts that secure the CPU
module in position.

Connect the SCSI ribbon cable (17-02944-01) to the CPU medule (see
Pigure 3-31 for the location of the SCSI ribbon cable).

Connect the power cable to the CPU module (see Figure 3-31 for the
location of the power cable).

Replacing FRUS

Remaving snd Banlasine FRUS

W4l logic board, and connect the DSW41 input/output cable
Follow the steps in Section 3.8.1 and Section 3.9.2 in reverse order
1 the logic board and cable.
8.

Install the DETW41 logic board, and connect the DHW41 input/output cable,
if fitted. Follow the steps in Section 3.10.1 and Section 3.10.2 in reverse
order to install the logic board and cable.

Install the drive-mounting panel. Follow the steps in Section 8.7 in reverse
order.

10. Install the enclosure cover. Follow the steps in Section 3.1 in reverse order
to install the cover.

he Power Supply Unit
Note

In MicroVAX 3100 platform systems, the power supply unit (H7033-AA)
is a single FRU. The power supply unit does not have any replaceable
components.

To rernove the power supply unit from the BAdZ-A enciosure, follow these
gteps:

Remove the enclosure cover (see Section 3.1).

Remove the drive-mounting shelf (see Section 3.7).

Disconnect the power cable from the CPU module (see Figure 3-31).

Loosen the two captive screws (see Figure 3—-34).

RE_ENDE2B0A_B1

Loosen the two Philips screws (80
unit to the left side of the enc!osm‘e(see Figare 3-34).

Ensure that vou ds naot damage any of the MS44 or MS44L memory
modules when you lift the power supply unit out of the enclosure.

Lift the front of the power supply unit (gsee Figure 3--34).
7.

Remove the power supply unit from the enclosure.

Removing and Replecin

he Ports on the

BA42-A System
Figure A-1 shows the pin specifications for the ports on the BA42-A system.

Pin Specifications for the Poris on the BA42-A System

A-1

on the BA42-A System

Figure &-1

1MV

tions for the Ports on the BA42-A System

;

8
8

EHvesniibves

aoNzart i

47
s

an
'

]
p1:

eru

i@
13

Bdathin

bad

Pawer

Sy
84544 Mamary bisgde
C imacars

IRE

ol
Vo urs tom
Licog=)

2CH Doviess

Vo end b
Extgms!
SO Devipan
{Zam Teio Axd)

]

——

waEvEEus Qplon VO
(Boa Volio f ¢ v 3 2ot Gity
oo Tarde A2 iy S-svasgiom
cordral

A=2

ins for the Perts on the BA42-A System

|—

Bynervenma OFisR KO
iBew Ty fed)

Pin Specliic atlons for the Ports on the BA42-A Systemn

ications for the Elgin-Data Line

Contact

Signal Name

Contact

Signal Name *

LINE ¢ TRANSMIT H

LINE 0 TRANSMIT L

LINE 0 RECEIVE H

LINE 0 RECEIVE L

LINE 1 TRANSMIT H

LINE 1 TRANSMIT L

LINE 1 RECEIVE H

LINE
1 RECEIVE L

LINE 2 TRANSMIT H

LINE 2 TRANSMIT L

LINE 2 RECEIVE H

LINE 2 RECEIVE L

LINE 3 TRANSMIT H

LINE 3 TRANSMIT L

LINE 8 RECEIVE H

LINE 3 RECEIVE L

)

LINE ¢ TRANSMIT H

LINE ¢ TRANSMIT L

LINE 4 RECEIVE H

LINE 4 RECEIVE L

LINE 5 TRANSMIT H

LOVE 5 RECEIVE B

LINE & RECEIVE L

LINE 6 TRANSMIT H

LINE 6 TRANSMIT
L

LINE 6 RECEIVE H

LINE 6 RECEIVE L

LINE 7 TRANSMIT H

LINE 7 TRANSMIT L,

LINE 7 RECEIVE H

LINE

150 OHMS TO GROUND

130 CIIME TO GROUND

150 OHMS TO GROUND

LINE 5 TRANSMIT L

7RECEIVE L

"The signal names ending with L are ative low; the signal names :nding with H are active high.

Pin Specifications lor the Poris on the BA42-A System

A<3

LINE RTS CONN<0> H

LINE 0 CTS CONN H

LINE ¢ DSR CONN H

LINE 0 SGND CONN L

LINE 0 CD CONN H

LINE 0 SPDMI CONN H

LINE DTR CONN<0> H

bbb

LINE 1 TX CONN L

fud

LINE RTS CONN<i>H

LINE 1 CTS CONN H

LINE 1 DSR CONN H

LINE 1 SGND CONN L

LINE 1 CD CONN H

LINE 1 SPDMI CONN H

LINE DTR CONN<i> H

LINE 1 RI CONN H

LINE RTS CONN<2> H

LINE 2 CTS CONN H
LINE 2 DSR CONN H
LINE 2 SGND CONN L
81

LINE
2 CD CONN H
LINE 2 SPDMI
CONN H

LINE DSRS CONN<i> H

N
o

LINE DSRS CONN<0> H

FYEREEZE®

LINE 0 RI CONN H

LINE
2 RX CONN L

SE55 5628862888888k
88

=
W

LINE ¢ R COMNN L

LINE 0 TX CONN L

LINE2 TKCCNN L

§0

LINE DTR CONN<2>
H
LINE
2 RI CONN H
LINE DSRS CONN«<2> H

LINE3STXCONN L
LINE 3 RX CONN L
LINE RTS CONN<S> H

LINE 8 CTS CONN H
LINE 3 DSR CONN H
LINE2SGNDCONN L
LINE 3 CDCONN H
LINE 3 SPDMI CONN H

LINE DTR CONN<S> H
LINE 8 RICONN H

LINE DSRS CONN<3> H

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

cations for the Porte or: the BA42-A System

lcationa for the Ports on the BA42-A System

CODEGND
1L
CODEO 1L

VISREAIPL

CODE:
1L

VeE BY B 3 DI

CODE21L

VasTXA1PL

CODE3 1L

V3sTXB1PH

TEDATAB)1PL

V6TXB1PH

TEDATAA) 1PH

V5RXCLKB1PH

TEDATA1PL

DIR1IPH

RI&CA1IPL

DSRA1PH

RT&/CB1PL

DSRB1PL

REDATAALIPL

RIS1PH

EXDATAB1PL

DCDIALIPH

LOCAL LOOP1PH

DCDIBIPL

TEST41PL

CITsA1PH

TEST111PH

Ci8SB1PL

REMILOOP1PH

DCEGND1PL

Ri1PH

TEST11PH

RECLOCKA1IPL

TEST21PL

RXCLOCKB1PH

DTEGND1PL

TECLOCK A1PL

DIRAL1IPH

“CIOCEB1PH

DIRBIPL

Tiow

ame

CLOCK1PL

CLOCKAIPL

V35 THCLKALIPL

CIOCKB1PH

Vs TACLKB1PH

TEST31PH

VeSS CLKA1PL

SPEEDSEL1PH

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

Pin 8 pecifications for the Poris on the BA42-A System

A-8

lcations for the E
ame°

GROUND

8 8 8

RESERVED
GROUND

DB@L

GROUND

DB %)L

LEELES

ATNL

GROUND

ACKL

GROUND

iy
BARTF &I LY

RSTL
GROUND

GROUND

RESERVED

REQL

RESERVED

GROUND

OPEN

VoL

DBOL
GROUND

DB(L

GROUND
DB@GL
GROUND

DB@L

DB(ML
GROUND

DB® L
GROUND
GROUND

RESERVE

SR &K E

GROUND

GROUND
GROUND

BSYL
GROUND

MSG L

GROUND
SEL L

GROUND
CDL

“The signal nawmes eading with L are active low; the signal names ending with H are active high.

tions for the Ports on the BA42

are Parts List

Table B~1 gives a list of the recommended spare parts for the MicroVAX 3100
Model 30 system that uses the BA42-A enclosure.
Table B-1

Recommended Spare Pants

eription °

Part Number

Quantity

54-20654-01

Cable assembly, SCSI A internal loop

17-03016-01

Cable assembly, SCSI A/B, CPU to VO

17-02844-01

3CSI cable clamp

80-11237.01

Terminator, 50-way SCSI (H8574-A)

12-30552-01

Loopback connector, standard Ethernet

12-22196-01

T-connector, ThinWire Ethernet (H8228)

12-25869-01

Terminator, ThinWire Ethernet, 50-chm (H8225)

12-26318-01

Loopback connector, modem port, 25-way

29-24785-00

Adaptey, 26-way E1A-232 to 6-way MMJ

H8575-A

Memory module, MS44-AA (4M bytes)

54-19103-AA

Memory module, MS44L-AA (4M bytes)

MS44L-AA

Power supply unit

H7083-AA

17-08017-01

RX26-AA

Cable aszembly, RX26 to SCSUFDI board

17-00285-00

RX26 SCSUFDI board

54-20764-02

CPU module, KA45-AA (SOC)

Ceable aszembly, de harness, lower shelf

RX2¢6 digkette drive

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

instructions - . how to replece these FRUs.

(continuad on next page)

Recommended Spare Parts List

B8-1

ription °

Part Number

Quantity

RZ23L disk drive

RZ23L-E

RZ24 disk drive

RZ24-E

RZ25 disk drive

RZ25-E

TZ30 tape drive

TZ220-A¥

74-34273-01

TZK10 tape drive

TZV.10-AA

Asynchronous option, DHW41 logic board

54-20662-01

Asynchronous option, DHW41 input/output cable

17-02842-01

Asynchronous option, DHW41 input/output module
(8-date only lines)

70-28540-02

Cable assembly, 2aynchronous, 36-way Champ to

17-01174-01

System loopback connector (8-dats only lines)

H3101-00

Cable loopbeck connector (8-data only lines)

H3101-060

Harmonica, 8-line distribution

H3104-00

Loopback connector, MMJ (H3103)

12-25083-01

70-28541-01

Cable assembly, asynchronous, 50-way uChamp to
four 25-way D-sub (BC29J-06)

17-02941.01

System loopbeck connector (4-modem control lines,
$4081-A)

12-34212-01

Synchronous option, DEW41 logic board

54-20640-01

Synchronous option, DSW41 input/output cable

17-02942-01

Synchronous option, input/output mode:le (single line)

70-28840.01

System lospback connector (H3188-00)

12-25862-01

Cable assembly, EIA-232/V.24 (BC19D-02)

17-061110-91

Cable assembly, E1A-423/V.10 (BC18E-02)

17-01111-01

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

17-01108.01

TZ30 take-up leander

harmonica

Asynchronous option, DHW41 input/output module
{4-modsm control lines)

1The major FRUs are the entries in this column thet are not indented. This manual gives

instructions on how to replace these FRUs.

(continued on next page

yamended Spare Pasts List

Recommended Spare Parts List

led Spare Paits
Part Number

Quantity

ELA-232/V.24 cable loopback connector

H3248.00

T1A-423/V.10 cable loopback connector (H3198-00)

12-26258-01

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

12-26259-01

System power cord (USA)

17-00606-02

Terminal cable (BC16E-25)

17-00811-.03

Antistatic kit

29-26246-00

"The major FRUs ere the entriss in this column that are not indented. This manual gives

instructions on how to replace these FRUs.

mended Spare Parts List

8-3

lossary

The glossary defines some of the important terms used in this manual.
]

alternating current.

Compact disc read-only memory.
CPU

Central processing unit. The main unit of a computer containing the circuits
that control the interpretation and execution of instructions. The CPU holds
the main storage, arithmetic unit, and special registers.
dc

direct current.

ESD
Electrostatic discharge.

A type of local ares network (lLAN) based on carrier sense multiple access with
collision detection (CSMA/DC).
FDY
Floppy diskette interface.
FRU

Field replaceable unit.
grousd

A voltage reference in a system that has a zerc voltage potential.

A short Irgth of wire used to ¢.mplete a circuit temporarily or to bypass a
civery’’

LED

Light emitting diode.

Modified modular jack.
lule

A unit that conteins electrical components and electrically conductive pathways
between components.

A physical connector.
fins

root mean square. The root mean square value of an alternating voltage is
the square root of the mean value of the square of the voltage values during a
complete cycle.

Read-only memory.
SCSI

Small computer system interface. An interface designed for connecting disks
and other peripheral devices to computer systems. SCSI is defined by an
Armerican National Standards Institute (ANSI) standard.
FSNTUETT EneTnet

An IEEE 802.3 compliant Ethernet network composed of standard Ethernet
cable as opposed to thin Ethernet cable.

A combination of system hardware, software, and peripheral devices that
performs specific processing operations.
ThinWire

A trademark used to describe Digital's IEEE 802.3 compliant products used for
local distribution of data communication.

Cables

disconnecting
from CPU, 3-44

Air

Communications options
list, 1-13
ports for, 1-8
Configuration

gt, 1-12

Air flow
typical value, 1-12
Air intake, 1-12
Aldtude
nonoperating,

communications options,

mass storage devices,

2-4

operating, 2—4

Asynchronous communications options
list of, 1-13
removing, 3-38

installing,

pin epecifications,

Basic system memory,
Break/enable LED
function of, 1-5
location of, 1-3
Break/enable switch
function of, 1-5
location of, 1-3

A-1

1-12

memory,

1-12

gystem,

i-1Z

Connectors
system unit, 1-3
Console terminal
communication parameters,
connecting, 2-7
Controls
gystem unit, 1-3
Cover
removing, 3-5
CPU module
removing, 3-43
replacing, 347

2-7

D
DHW41
removing,

3-39

DHW41 input/output cable
removing,

1-13

1-16

$-41

DHW41 input/output module
removing,

Cable clamp
releaging,

3-34

Cable icopback connectors, B-1

342

DHWA41 logic board
removing,

3-40

Dimengions

B~42-A enclosure, 2-1

inder=%

Dimengions (cont’d)
shipping container, 2-2
Diek dwive
removing,

=
FDI/SCSI board
removing, 3-18

3-10

Diskette drive
removing, 316
Drive-mounting shelf
fanction of, 1-16
power distribution, 3-11
removing, 3-31

Field replaceable unit

See FRU
Flying lead connector, 3-24

FRU
defined, 3-1
list, 3-3
locations, 3-3
gection references, 3-3

H
Heat dissipation
typical value, 2-3
Humidity
nonoperating, 2-4

operating, 2—4
storage,

2-4

i
dezcription of,

1-1

removing cover,

protection,

3-5

2-3

Ethernet 1D ROM
Ioeation of, 347
orientetion of, &-47
standard Ethernet, 2-12
Ethernst switeh
function of,

1-5

location of, 1-3
Ethernet terminators
connecting,

2-10

ID ROM
removing, 3-47
Indicators
power OK, 1-3
system unit, 1-3
Input/output module

DHW4
., romoving, 342
D8W4), removing, 3-38
Interconnectio:. diagram, A-1

J
Jumper wires

RZZ3L, 3-i4
RZ24, 3-15
RZ25, 3-16
TZK10, 3-30

é{ms CPU medule

Nonoperating conditions, 2-4

remmoving, 3-438

L
mD mflw i-6

B%Wm mmmn@, 3-36
dwd Bthorpet, 2-12

On/Off switch
function of, 1-§
location of, 1-3
Operating conditions, 2-4

P
Pin specifications, A-1
Ports
agynchronous, 1-3
function of, 1-8

storage devices
combinagtions, 1-16
liat, 1-i6
crientation,

Memay

1-16

idendiying,

1-3

location of, 1-3

MMJ, 1-3
SC]l, 1-8
synchronous, 1-3
Power cord
connecting, 2-12
Power distribution, 1-8 to 1-9

Power OK indicator, 1-3
Power requirements, 2-4
Fower supply unit
dc current outputs, 1-8
flying lesd connector, 3-24
output power,

removing,

1-8
3-49

specifications, 1-8
Fowergn indicator, -3

R
Recommended spare parts
list of, B-1
RX26 digkette drive
mounting bracket, 3-19
removing,

3~16

RX26 FDI/SCSI board
removing,

318

System unit (cont’d)
connectors, 1-3, 2-7
contyols, 1-8
dimeneions, 2-1
indicators, 1-3
ports, 1-8, 2-7
gpare parts for, B-1
turning on, 2-14

@GSI 1)) @@%fin@, 8-14

R”% digk drive
removing,

$-10

8C8I ID setting, $-14¢

T
Tepe drive
1230, removing, 3-22
TZK10, removing, 3-26
Temperature
nonopsrating,

switch leeztons, 3-20
%1, somaper wive lotations, 3-14
jumper wive locations, 2-18
b jumper wire locations, 3--16

TZ30 switch locations, 3-25
TZK10 jumper wire locations. 830
g
digtribution, 1-10 ¢to 1-11
ments, 2-7

&Mfi@ Q§Wffiw

Sez BSD, 2-3
Stovege conditions,

2-4

&apwfl @i&m
ting,3-11
Synchronous mmumcatiom options

1-18

am' mwk@,

Terminator
ThinWire Ethernet, 2-10
TZ30 tape drive
mounting bracket, 3-24
removing, 3-22
SCSI ID eatting, 3-25
TZK10 tape drive
mounting bracket, 3-28
removing, 2-26
SCSI ID getting,
3-30
B
o3

lizt of, @-«1

list @fi

2-4

operating, 2-4
storage, 2-4

1-12