DEC DECpc 433 User manual

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DECpc™ 433 Workstation
Service Guide
Order Number ER-PCW10-SV·001
digital equipment corporation
maynard, massachusetts

June 1991
The information in this document is subject to change without notice and
should not be construed as a commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that
might appear in this document.
The software,
if any, described in this document is furnished under a license
and may be used or copied only in accordance with the terms of such license.
No responsibility is assumed for the use or reliability of software or
equipment that is not supplied by Digital Equipment Corporation orits
affiliated companies.
Restricted Rights: Use, duplication,
or disclosure by the U.S. Govemml~nt is
subject to restrictions as set forth in subparagraph
(c) (1) (ii) of the Rights in
Technical Data and ComputerSoftware clause at
DFARS 252.227-7013.
DECpc 433 Workstation Service GuiJe
Copyright'!> Digital Equipment Corporation.
AH Rights Reserved.
Printed in U.S.A.
IBM, PC/XT/AT, and Personal System/2 are registered trademarks of
International Business Machines Cotporation.
Intel is a registered trademark
of The Intel Corporation.
Microsoft, MS-DOS,
MS 05/2, and XENIX are registered trademarks of
Microsoft Corporation.
SIMM is a registered trademark of Wang Laboratories.
Texas Instruments is a registered trademark
of Texas Instruments
Incorporated.
NEC is a registered trademark of NEC Corporation.
Mitsubishi is a registered trademark of Mitsubishi Corporation.
Diagsoft is a registered trademark of Diagsoft.

The following are trademarks of Digital Equipment Corporation:
DEC
DECstation
RSTS
DEC/CMS
DEC pc
'.RSX
DEC/MMS
DEC writer UNIBUS
DECnet
DIBOL
VAX
DECsystem-IO
EduSystem VA.Xduster
DECSYSTEM-20
MASS BUS
VMS
DEC US
PDP
VT
.nmnnma™
The FCC wants you to know ...
This equipment has been tested and found to comply with the limits for a
Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment This equipment
generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmful interference
in which case the user
will be required to correct the interference at his own expense.

This equipment is in the 1st Class category (infonnation equipment to be used
in commercial and/or industrial areas) and conforms to the standards set by
the Voluntary Control Council For Interference by Data Processing
Equipment and Electronic Office Machines aimed at preventing radio
interference
in commercial and/or industrial areas.
Consequently, when used in a residential area or
•nan adjacent area thereto,
radio interference may
be caused to radios and TV receivers, etc.
Read the instructions for correct handling.
I
I
i
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~lT~I·~-T~m~~~M~~§~~L~m~M~~~~~~~~§
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{:f...,T. tt~~~~t:Li.fO)~fiLt.:itl!~T{fffi"t~2:. ~,,1-. 7-L--t
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~------------ ------------ ------- --- ---~--··· ·- ---·- ·~-- - ... 1

This equipment has been tested for radio frequency emissions and has been
verified to meet VDE 0871 Ciass B.
Declaration of the Manufacturer to Importer.
We hereby certify that th> DECpc 433 Workstation is in compliance
with vfg
1046 and is RF1 suppressed.
The marketing
and sale of the equipment was reportPd to the German Postal
Service.
The right to retest this
equipment to verify compliance with the regulation
was given to the German Postal Servin>.
Digital Equipment Corporation

Bescheinigung des Hers tellers/Importeurs
Hiermit wird bescheinigt, daiS der DECpc 433 Workstation in
Ubereinstimmung mit den Bestimmungen der vfg 1046 funk-entstOrt ist.
Der Deutschen Bundespost wurde das im·erkehrbringen diesPs Gerates
angezeigt und die Berechtigung zur Uherpriifung der Serie auf Ein.haltung
der ~2stimmungen eingeraumt.
Digital Equipment Corporation

Contents
1 System Description
Introduction....................................................... . .. ....... ....................... 1-1
System Box ....................................................................................1 -3
System Board..........................................................................1-3
SIMMs ...............................................................................1-3
External Cache .................................................................1-3
Power Supply .......................................................................... 1-4
3.5-lnch Disk Drives ................................................................1-4
2.5-lnch
IDE Disk Drive ............................................................ 1-4
Intelligent Graphics Controller ................................................. 1-4
Battery .....................................................................................1-5
SCSI Expansion Box ......................................................................1-5
Monitors .........................................................................................1-5
Keyboard.....................................................................................1-6
Muuse ............................................................................................ 1-6
2 Troubleshooting
Introduction .......................................................................................... 2-1
Special Tools........................................................................................ 2-1
POST ....................................................................................................2-3
System Board Hardware Tests ..................................................... 2-3
Peripheral Hardware Tests............................................................2-4
POST Sequence ...................................................................................2-5
POST Error Messages.... . .....................................................2-6
Beep Codes........................................................................................ 2-11
Initial Troubleshooting ........................................................................2-15
System Box Troubleshooting .............................................................2-16
Disk Drives ..........................................................................................2-18
Monitor...............................................................................................2-19
SCSI Expansion Box ........................................................................... 2-20
DH.:;c 433 Workstation Service Manual

Contents
3 System Box FRU Replacement
Introduction........................................................................................... 3-1
System Box FR Us................................................................................. 3-1
Before You Begin..................................................................................3-3
Outside Cover.......................................................................................3-4
Chasnis Inner Cover.............................................................................3-9
2.5-lnc:h Hard Disk Drive ....................................................................3-13
3.5-lnch Mass Storage Device ............................................................3-16
System Battery....................................................................................3-23
Intelligent Graphics Controller.............................................................3-25
External Cache.................................... .. .. .... .. .. .. .. .. .. .. .. . .. .. .. . .. .. ....... 3-29
Power Supply . .......... ...... ..... ... ..... . .. ....... .. ....... .... ... .. .. .. . .... 3-31
SIMMS ...................................................................................3-34
System Board .................................................................................3-37
4 SCSI Expansion Box FRU Replacement
Introduction ........................................................................................... 4-1
SCSI Expansion Box F RUs ................................................................... 4-1
Before You Begin..................................................................................4-2
Cover ....................................................................................................4-3
Removing SCSI Devices (5.25-lnch Mounting
Trays) ..........................4-7
Removing SCSI Devices (3.5-lnch Mounting Tray) .........................4-12
Power Supply..................................................................................... 4- 16
A
,,.. .,..,,. ..
rower Lonsumpuon
Introduction ....................................................................................... A- i
Power Requirements .......................................................................... A-1
System Board Current Requirements................................................. A-2
ii
DECpc 433 Workstation Service Manual

Contents
B Interface Connectors
Introduction .......................................................................................... B-1
System Box Connectors ................................................................... B-1
Serial Ports ........................................................................................... B-2
Parallel Port ..........................................................................................B-3
Keyboard and Mouse ..........................................................................8-4
Monitor Connector ...............................................................................B-5
SCSI Connector ...................................................................................B-6
C ROM-Based Setup
Introduction ........................................................................................ C-1
Running Setup .................................................................................. C-2
Changing Configuration Settings .........................................................C-5
Configwation Setting Descriptions.................. .. ...............................C-6
Time .............................................................................................C-6
Date...............................................................................................C-6
Language......................................................................................C-6
Diskette .........................................................................................C-6
IDE Disk......................................................................................... C- 7
Base Memory ............................................................................... C- 7
Extenried Memory ......................................................................... C- 7
CPU Speed ...................................................................................C-7
SCSI Hard Drive ........................................................................... C-8
User Definable Drivers ..................................................................C-8
DECpc 433 Workstation Service Manual
!ii

Contents
LAN Boot. ......................................................................................C-8
LAN Timeout ................................................................................C-8
Shadow......................................................................................... C-9
Cache............................................................................................ C-9
Password ...................................................................................... C-9
System Information Menu................................................................... C-9
Exiting Setup ........................................................................................ C-9
D Device Mapping
Introduction.......................................................................................... 0- 1
iv DECpc
433 Workstation Service Manual

1-1
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
3-10
3-11
3-12
3-13
3-14
3-15
3-·16
3-17
3-18
3-19
3-20
3-21
3-22
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-d
4-9
4-10
B-1
C-1
C-2
C-3
Figures
DEC pc 433 Workstation....................................................................... 1-2
Removing the System Box Cover ........................................................3-5
Replacing the System Box Cover ......................................................... 3- 7
Power Cord Safety Loop Location .......................................................3-8
RP moving the Chassis Inner Cover . .. .. .. . .. .. .. .. .................................. 3- 1O
Replacing the Inner Cover ..................................................................3-12
Removing the 2.5-lnch Hard Disk Drive .............................................3-14
Removing the 2.5-lnch Hard Disk Drive From the Mounting Tray ......3-15
Floppy Disk Drive Rear Connections..................... ....................3-17
Removing a 3.5-lnch Mass Storage Device.... ....... . . ....................3-18
Removing a 3.5-lnch M8ss Storage Device From a Mcunting Tray ... 3-19
Setting the Floppy Disk ID Select Switch...........................................3-20
IDE Hard Drive Rear Connections .. .. .. .. .. . .. .. .. .. ...... . . .....................3-22
Removing and Replacing the System Battery ....................................3-23
Removing the Intelligent Graphics Controller ...................................3-26
Installing th.= Intelligent Graphics Controller................ .. .. .. ...............3-28
Removing and Repiacing the External Cache ...................................3-30
Removing the Power Supply... ... ...... . .. ......................................3-32
Replacing the Power Supply. .. .. ... . .. ..... .. .. . . .... .. .. .. . .. .. .. . .. .... 3-33
Removing a SIMM .............................................................................3-35
Replacing a SIMM ...............................................................................3-36
Removing the System Board ......................................................3-38
Replacing the System Board ................................................... 3-40
Removing the SCSI Expansior. Box Cover ..........................................4-4
Replacing
the SCSI Expans:on Box Cover .........................................4-6
SCSI Device Rear Ccnnect.ions (5.25-inch Mounting Tray) ................. 4-8
Removing a SCSI Device (5.25-lnch Mounting Tray .............................4-9
Removing a
SCSI Device from a 5.25-lnch Mounting Tray ................ 4-10
Attaching a 3.5-lnch SCSI Device to a 5.25-lnch Mounting Tray ........4-11
SCSI Device Rear Connections (3.5-lnch Mounting Tray) ..................4-13
Removing a
SCSI Device (3.5-lnch Mounting Tray).. .............. 4-14
Removing a SCSI Device From a 3.5-lnch Mounting Tray ................. 4-15
SCSI Power Supply Mounting............................................................4-17
External Connector
Pin 1 Locations..................................................... B-2
Setup Screen
One ................................................................................ C-3
Setup Screen Two ........................................................................... C-4
Exiting Setup Menu ........................................................................... C-1 O
DECpc 433 Workstation Service Manual
v

Tables •
1-1 Optional Monitors .................................................................................1-6
2-1 Special Tools ........................................................................................2-2
2-2 POST Error Messages..........................................................................2-7
2-3 Fatal Error Beep Codes ......................................................................2-12
2-4
Non-Fatal Beep Codes .......................................................................2-13
2-5 Intelligent Graphics Controller Beep Codes .......................................2-14
2-6 System Box Troubleshooting...............................,..............................2-16
2-7
Disk Drive Troubleshooting.................................................................2-18
2-8 Monitor Troubleshooting.....................................................................2-19
2-9 SCSI Expansion Box Troubleshooting ................................................2-20
3-1 System Box FR Us ................................................................................. 3-1
4-1 SCSI Expansion Box FR Us ................................................................... 4-1
A-1 Power Reqt..irements ........................................................................ A-1
A-2 Current Requirements .......................................................................... A-2
B-1 Serial Port Pinouts (J2A, J28) .............................................................. 8-2
8-2 Parallel Port Pinouts (J 1 O) .................................................................... B-3
B-3 Keyboard/mouse Pinouts .................................................................... B-4
B-4 Monitor Connector p ... .;uts (P1) ....................................................... 8-5
8-5 SCSi Connector Pinouts (J6) .............................................................. 8-6
0-1 System Memory Map.......................................................................... D-1
0 ·2 1/0 Address Map ................................................................................D-2
0-3 System Interrupt Levels .......................................................................D-4
0-4 LAN Memory Map................................................................................D-5
DECpc 433 Worksta~io'l Servir.e Manual
vi

About This Guide
Purpose
This service guide is designed to help you diagnose faulty components and
repair the DECpc 433 Workstation and the optional SCSI Expansion Box. This
guide only contains information servicing the base system
and expansion box.
Specific information on configuring and installing mass storage
options is
covered in
the individual option installation guides supplied with those
products. Information on troubleshooting and repairingvideo monitor
opticms is also covered in separate service documentation.
Audience
Th:s guide is written specifically for an authorized repair technician. It also
assumes a familiarity with the general terminology associated with personal
computers.
Organization
This service guide is organized as follows:
Chapter1
Chapter2
Chapter3
Chapter4
System Description -briefly describes the
workstations major components.
Troubleshooting-provides troubleshooting
information for the system box
and SCSI expans;on
box.
System Box FRU Replacement -describes how to
remove and replace system box FRUs.
SCSI Expansion Box FRU Replacement -describes
how to remove and replace SCSI expansion box
FR Us.
DECpc 433 Worksbtion Service Guide
vii

About This Guide
Appendix A
Appendu B
AppendixC
AppendixD
Index
Power Consumption - provides power
consumptions specifications for the system box and
SCSI expansion box.
Interface Connectors-lists interface
infonnation
for all system connectors.
ROM-Based Setup-describes the Setup utility
and system configuration information.
Device Mapping-providestables listing the
system memory map, 1/0 address map, interrupt
map, LAN memory map, and DMA map.
Index - an index of service guide information.
Notational Conventions
Notational conventions used throughout this guide include:
...
H
Kb
KB
Mb
viii
In connector pinout listings, the asterisk( .. )
indicates an active low signal, for example,
IOCHCK•
An H suffix to a numerical value denotes
hexadecimal numbers, for example, OF8H equals
OF8 (hexadecimal).
A Kb suffix to a numerical value indicates sizein
kilobits, for example, 512 Kb. A kilobit equals 1024
bits.
A KB suffix to a numerical value indicates size in
kilobytes, for example, 640 KB. A kilobyte equals
1024 bytes.
An Mb suffix to a numerical value indicates size in
megabits, for example, 4 Mb. A megabit equals
1,048,576 bits.
DECpc 433 Workstation Service Guide
•

About This Guide
MB
GB
An MB suffix to a numerical value indicates size in
megabytes, for example, 1MB. A megabyte equals
1,048,576 bytes.
A GB suffix to a numerical value is used to indicate
size in gigabytes, for example, 1 GB, 256 GB, etc.
Agigabyte equals 1,073,741,824 bytes.
An italicized word or phrase is used to represent a variable or to lend
emphasis in textual descriptions. File names,
p.:;th names, and directories are
also italicized.
Three kinds of special notices are used
throughout this guide to emphasize
specific
inform~tion:
WARNING
WARNING indicates the presence ofa hazard that
can cause personal injury if the hazard is not
avoided.
CAUTION
CAUTION indicates the presence of a hazard that
might cause damage to hardware or corrupt
software.
NOTE
Notes are used to provide important or explanatory
information.
DECpc 433 Workstation Service Guide
ix

About This Guide
OrderingParts
Customers who maintain their own equipment can order spare parts by either
phone or mail, or through any Digital sales office.
To order parts by phone, call 1-80CJ..DIGITAL from 8:30 am to 8:00 pm (Eastern
Standard Time).
To order partsby mail, send a purchase order to:
Digital Equipment Corporation
P.O. Box CS2008
Nashua NH 03061
Related Documentation
The following documents are available as supplements to the infonnation
provided in this service guide.
Document Part Number
DECpc 433 Workstation User's
ER-PCWto-UG
Guide
DECpc SCSI Expansion Box
ER-PCWXE-IG
Installation Guide
DECpc 433 Workstation Technical
PCWIY-AA
Reference Manual
MS-DOS Supplemental Kit
PCWXQ-XA
Installation Guide
0512 Supplemental Kit Installation
PCWXQ-XB
Guide
x DECpc
433 WorkstationService Guide
•

About This Guide
Digital personnel can 1Jrder documents with part numbers beginning with
either ER or EK from:
Digital
Equipment Corporation
444 Whitney Street
Northboro, MA 01532
Attn: Publishing and Circulation Services Ordering Processing Section.
Digital personnel can
order documents with part numbers beginning with AA
from:
Digital
Equipment Corporation
Digital Drive
WestminsterMA
01473-0471
Attn: Order Administration
Digital self-maintenance customers can order documents with part numbers
beginning with EK, ER, or AA by mail from:
Digital
Equipment Corporation
Peripherals
and Supplies Group
P.O. Box CS2008
Nashua, NH 03061
Or, by calling 1-800-DIGITAL between the hours of 8:30 am to 8:00 pm
(Eastern Standard Time)
DECpc 433 WorkstationService Guide
xi

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1
Systein Description
Introduction
The DECpc 433 Workstation (see Figure 1-1) is a highly-integrated i486 ni
based desktop computer. Its high integration increases reliability and reduces
the numberof service actions that can be done in the fkld. In general, service
actions are removing
and replacing field replaceable units (FRUs).
The remainder of this chapterbriefly describes the FRUs of each DECpc 433
Workstation's major components. Majorworkstation components include:
• System box
• SCSI expansion box
• Monitor
• Keyboard
• Mouse
DECpc 433 Workstation Service Guide
1-1