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ER-PCW10-SV-1

June 1991

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Document:	DECpc™ 433 Workstation Service Guide
Order Number:	ER-PCW10-SV
Revision:	1
Pages:	138
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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 or its
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 Computer Software 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
DEC/CMS
DEC/MMS

DECnet
DECsystem-IO
DECSYSTEM-20
DEC US

DECstation

DEC pc
DEC writer
DIBOL
EduSystem

MASS BUS
PDP

RSTS
'.RSX
UNIBUS
VAX
VA.Xduster
VMS

.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.

-:. 0)~11,d.. ~ --flt#fR~il <imI•J:tE~1: j:.J l

\'."

f~ffl ~ t1 ~ r,

efflflH~

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~,,1-.

7-L--t

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i

L__

~------------

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

---

---~--···

·-

- - - · - ·~--

... 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 DEC pc 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

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

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

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

SCSI Expansion Box FRU Replacement
Introduction ........................................................................................... 4-1
SCSI Expansion Box FRUs ................................................................... 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

,,..

.,..,,.

rower Lonsumpuon

Introduction ....................................................................................... A- i
Power Requirements .......................................................................... A-1
System Board Current Requirements ................................................. A-2

DEC pc 433 Workstation Service Manual

Contents

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

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

Device Mapping
Introduction .......................................................................................... 0-1

DECpc 433 Workstation Service Manual

Figures
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

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
.............. 4-14
Removing a SCSI Device (3.5-lnch Mounting Tray)..
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

DEC pc 433 Workstation Service Manual

Tables

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

2-7
2-8

2-9
3-1
4-1
A-1
A-2

B-1
8-2
B-3
B-4
8-5
0-1
0 ·2

0-3
0-4

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

DECpc 433 Worksta~io'l Servir.e Manual

•

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 repairing video 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:
Chapter 1

System Description - briefly describes the
workstations major components.

Chapter 2

Troubleshooting - provides troubleshooting
information for the system box and SCSI expans;on
box.

Chapter3

System Box FRU Replacement - describes how to
remove and replace system box FRUs.

Chapter4

SCSI Expansion Box FRU Replacement - describes
how to remove and replace SCSI expansion box

FRUs.

DECpc 433 Worksbtion Service Guide

vii

About This Guide

Appendix A

Power Consumption - provides power
consumptions specifications for the system box and
SCSI expansion box.

Appendu B

Interface Connectors - lists interface infonnation
for all system connectors.

AppendixC

ROM-Based Setup - describes the Setup utility
and system configuration information.

AppendixD

Device Mapping - provides tables listing the
system memory map, 1/0 address map, interrupt
map, LAN memory map, and DMA map.

Index

Index - an index of service guide information.

Notational Conventions
Notational conventions used throughout this guide include:

...

In connector pinout listings, the asterisk ( .. )
indicates an active low signal, for example,

IOCHCK•
H

An H suffix to a numerical value denotes
hexadecimal numbers, for example, OF8H equals
OF8 (hexadecimal).

A Kb suffix to a numerical value indicates size in
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.

viii

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

An MB suffix to a numerical value indicates size in
megabytes, for example, 1 MB. 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.
A gigabyte 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 of a 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

About This Guide

Ordering Parts
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 parts by 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
Guide
DECpc SCSI Expansion Box
Installation Guide
DECpc 433 Workstation Technical
Reference Manual
MS-DOS Supplemental Kit
Installation Guide
0512 Supplemental Kit Installation
Guide

ER-PCWto-UG
ER-PCWXE-IG
PCWIY-AA
PCWXQ-XA
PCWXQ-XB

DECpc 433 Workstation Service 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
Westminster MA 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 Workstation Service Guide

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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 number of 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 chapter briefly describes the FRUs of each DECpc 433
Workstation's major components. Major workstation components include:
•

System box

•

SCSI expansion box

•

Monitor

•

Keyboard

•

Mouse

DECpc 433 Workstation Service Guide

1-1

•

System Description

•
Ot.1-00596

Figure 1-1. DECpc 433 Workstation

1-2

DECpc 433 Workstation Service Guide

•

System Description

System Box
System box FRUs include a system board, a power supply, an intelligent
graphics controller, an optional 3.5-inch floppy disk drive or 3.5-inch IDE
hard drive, and an optional 2.5-inch IDE hard drive.

System Board
System board FRUs include Single In-line Memory Modules (SIMMs) and an
external cache. All other system board components are soldered in place,
making field replacement impractical.

SIMMs
There are three SIMM banks on the system board. Each bank has four SIMM
sockets. Either 1 MB x 9 or 4 MB x 9 SIMMs can be installed in each socket
Both SIMM sizes can be used at the same time; however, SIMM types w:thin a
bank must be identical. The system also requires SIMMs having an access
time of 80 ns or faster.
The base system is shipped with 8 MB (eight 1 MB x 9 SIMMs). The customer
might have installed additional SIMMs. If a system board needs to be
replaced, the original 8 MB of SIMMs should remain with the system board
when returned to the factory. The additional SIMMs should be reinstalled
on the replacement system board.

External Cache
The external cache is an option. When :nstalled it provides either 64 KB or
128 KB of external cache memory.

DECpc 433 Workstation Service Guide

1-3

•

System Description

Power Supply
The power supply is capable of supplying 105 Watts of power. It supplies
power to system box components. The optional 3.5-inch disk drives receive
power directly from the power supply. The optional 2.5-inch IDE hard drive
receives power from the system board.

3.5. . Inch Disk Drives
Two 3.5 ~nch disk drives are optional. Either a 3.5-inch floppy disk drive or a
3.5-inch IDE hard disk drive can be installed.

2.5-lnch IDE Disk Drive
The 2.5-inch IDE hard disk drive is optional.

Intelligent Graphics Controller
The intelligent graphics controller supports both m01.ochrome and color
monitors and has four SIMM sockets that support 1 MB or 4 MB SIMMs.
The base system is shipped with no SIMMs installed on the intelligent
graphics controller. If the intelligent graphics controller needs to be replaced
and if the customer has SIMMs installed, the four SIMMs should be
reinstalled on the replacement intelligent graphics controller.

1-4

DECpc 433 Workstation Service Guide

•

System Description

Battery
The battery provides power for non-volatile memory when power is removed
from the workstation. Non-volatile memory contains system configuration
information. The battery receives charge current when power is applied.

SCSI Expansion Box
The SCSI expansion box is a DECpc 433 Workstation option that provides a
housing and power supply for up to three SCSI devices. It has two 5.25-inch
peripheral device bays that accept 5.2.5-inch peripheral devices and one 3.5inch peripheral bay that accepts 3.5-inch peripheral devices. The internal
supply provides 63 Watts of power.

Monitors
The DECpc 433 Workstation supports the following Digital VR series highresolution fixed-frequency (66fl2 Hz) workstation monitors. Contact your
Digital Sales Representative for a current list of monitors supported (refer to
Table l-1.
Monitor service information in this guide is limited to a typical monitor.
Refer to any service documentation shipped with the supported monitors.

DECpc 433 Workstation Service Guide

1-5

System Description

Table 1-1. Optional Monitors

Model

Size

Type

Resolution

Vert
Freq

VR320-DA
VR319-DA
VR32Q..CA
VR319-CA
VRT19

19 incli

Color

1280 x 1024

72Hz

19inch

Monochrome

1280 x 1024

72Hz

19 inch

Color

1280 x 1024

66Hz

19inch

Monochrome

1280 x 1024

66Hz

19inch

1280 x 1024

66Hz

VRT16

17inch

Color
Color

1280 x 1024

66Hz

Color

1280 x 1024

60Hz

ISMt

·-

t Industry Standard Monitor (ISM) represents most common 1280 x 1024 monitors
(Mitsubishi Model 6905, NEC 50, etc.).

Keyboard
There are no seivice procedures for the keyboard other than replacement.

Mouse
Service procedures for the mouse is limited to cleaning the mouse ball and
tracking mechanism. F.efer to the appropriate documentation supplied with

the mouse.

DECpc 433 Workstation Service Guide

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Troubleshooting
Introduction
This chapter provides troubleshooting instructions for the DECpc 433
Workstation. It is divided into the following sections:
•

Specal tools

•

Power-on Self Test (POS1)

•

lnitia\ troubleshooting

•

System box troubleshooting

•

Disk drives

•

Monitor

•

SCSI expansion box

Special Tools
A standard field service tool kit and the special tools (listed in Table 2-1) are
needed to troubleshoot and repair the DECpc 433 Workstation.

DECpc 433 Workstation Service Guide

2-1

Troublf!shooting

Table 2-1. Special TllOls

Tool

Part Number

Description

Diagsoft QA Plus/FE

TBD

Standalone
diagnostics available
separatdy.
Documentation
included with
software kit

Tri-wrap Loopback
connector

FD-101( 4-00

This triple connector is
1.1.sed to test 25-pin and
9-pin serial ports, and
25-pin parallel ports.

MS-DOS Supplemental
Kit

PCWXQ-XA

This software kit
contains MS-DOS
SCSI device drivers,
base video drivers,
and graphics
application drivers
needed for the DECpc
433 Workstation.

MS OS/2 Supplemenl '
Kit

PCWXQ-XB

·-·

2-2

This software kit
contains replacement
MS OS/2 Ver 1.21
diskettes that support
SCSI hard disk drive
installation, and a
presentation manager
driver needed for the
DECpc433
Workstation.

DECpc 433 Workstation Service Guide

Troubleshooting

POST
Before your DECpc 433 Workstation can be used, all system components must
be initialized and tested, and the operating system loaded into memory. The
basic inpuVoutput system (BIOS) that is stored in ROM controls this sequence
of actions. A portion of the BIOS contains a Power-on Self Test (POST).
POST is responsible for initializing and testing system components each time
power is applied or when the system boots. The remainder of the BIOS loads
the operating system and specific applications.
POST consists of a set of tests used to check the condition of the system
circuitry and report system malfunctions. The organization of POST allows
testing to progress from the lowest level of hardware to the initialization of
external peripherals e.g., disk drives, keyboard, monitor, etc.
There are two types ot POST tests: system board hardware and peripheral
harU.ware.

System Board Hardware Tests
POST checks the system board hardware first. If any of these tests fail, a fatal
error condition exists and further testing and initialization is not possible.
You are notified that an error condition exists by the lighted fault LEDs on
the system board and/or intelligent graphics controller, an error message
displayed on the monitor screen, or beeps from the system speaker. Refer to
the I:sts of POST error messages and beep codes provided at the end of this
chapter. The following identifies the system hardware tests and their order of
execution:
•

Programmable Interrupt Controller (PIC)

•

82340 chip set

• CPU

DECpc 433 Workstation Service Guide

2-3

Tro•Jbleshooting

•

Keyboard controller

•

CMOSRAM

•

ROM BIOS (checksum)

•

Programmable Interrupt Timer (PIT)

•

DMA controller

•

Base 64 KB system RAM

•

Cache conttolier

Peripheral Hardware Tests
The first peripheral hardware test procedure verifies that the system
configuration data stored in CMOS RAM matches the hardwart present.
Then, the procedures continue to test and initialize other peripheral
hardware. A test failure generally results in an error message on the monitor
screen. The following list identifies the peripheral hardware tests and their
order of execution:

• CMOS RAM configuration data
• RAM memory above 64 KB
• Keyboard
• SeriaVparallel interface circuitry

• Floppy disk controller
• Hard disk controller
• Intelligent graphics controller

2-4

DECpc 433 Workstation Service Guide

Troubleshooting

POST Sequence
While POST is running, a numeric countdown (240 to 000) is displayed on the
monitor screen as it sequences through the test procedures.

NOTE
During the POST memory test, the system displays
the amount of memory being tested. The amount of
installed memory determines the memory test
duration. It can take up to 60 seconds to complete.

If POST does not find any error conditions, the system board speaker beeps
once and displays a message. If you do not enter Setup, the system attempts
to boot the operating system in about 10 seconds. When POST completes, a
message similar to the following appears:

Phoenix 80486 ROM BIOS PLUS Version 1.10.31.POF
Copyright (C) 1985-1990 Phoenix Technologies Ltd.
All Rights Reserved
640K Base Memory

07168K Extended Memory
100

To enter Setup press:

If POST finds an error condition, the system board speaker beeps twice and
then POST displays an error message on the monitor screen. For more
infonnation, refer to the POST Error Messages and Beep Codes at the end of
this chapter. The following is an example of a screen display for an error
condition:

DECpc 433 Workstation Service Guide

Troubleshooting

Phoenix 80486 ROM BIOS PLUS Version 1.10.31.POF
Copyright {C) 1985-1990 Phoenix Technologies Ltd.
All Rights Reserved
640K Base Memory
07168K Extended Memory
150 (0017): Time-of-day clock stopped.

POST Error Messages
POST tries to notify you of the error conditions it has found. If the monitor is
initialized, POST displays an error message on the monitor screen and beeps
the system board speaker twice. U an error occurs before the monitor is
initialized, a beep code sounds (refer to Beep Code lists at the end of this
chapter). Table 2-2 lists, by countdown number, the POST error messages. it
also describes each message and, in most cases, a recommended solution.
NOTE
Xs in the message column indicates that this portion
of the message depends on an actual error condition.

DECpc 433 Workstation Service Guide

Troubleshooting

Table 2-2. POST Error Messages

Message

Solution

0007

No timer tick

Replace system board.

200
190
180

0001

Gate A20 failure

Replace system boa:rJ.

0009

Timer 2 failure

Replace system board.

0010

Keyboard stuck
key
Keyboard
controller
Keyboard clock
line
Keyboard data
line Keyboard
failure

Check the keyboard
connection. Look for
stuck key. Replace
keyboard.

170

0041

Pointing device
failure

Check mouse
connecti.:>n. Replace
mouse.

640 KB base
memoryOKB
extended
memory

Repiace system board.

POST
Countdown
No.

Error

240

Message
No.

160

150

0017

Time-of-day
clock stopped

Replace system board.

100

0018

Invalid
configuration
I information

Run Setup.

DECpc 433 Workstation Service Guide

2-7

Troubleshooting

Table 2.-2. POST Error Messages (continued)

POST
Countdown
No.

Error
Message
Message
No.

Solution

090

0011

Floppy disk
drive failure

Check all connections.
Replace floppy disk
drive.

080

0015

Hard disk
controller
failure

Check all connections.
Replace hard disk.

080

0016

Hard diskO
failure

Check all connections.
Replace hard disk.

070

No SCSI BIOS
found at xxxx

Check all SCSI
connections. Replace
system board.

215

Target 0: disk
format not 512
bytes/biock

Non-standard SCSI hard
disk drive installed.
Repiace SCSI drive with
standard SLSI drive.

214

Target 0: disk
drive ready, but
read capacity
failed

SCSI hard disk drive
failure. Replace SCSI
drive.

2-8

DECpc 433 Workstation Service Guide

Troubleshooting

Table 2--2. POST Error Messages (continued)
-·~-·

POST
Countdown
No.
070

Error
Message
Message
No.
213
Target 0: disk
drive connected,
but not ready

060

Solution

SCSI hard disk drive
failure. Replace SCSI
drive.
SCSI ID conflicts. Set
correct SCSI ID number.
Refer to your SCSI
Expansion Box
Installation Guide .

212

Target 0: target
connected, but is
not a disk drive

211

Target 0: target
connected, but
has a fault

SCSI hard disk drive
failure. Replace SCSI
drive.

210

Target 0: target
not connected

200

Host adapter
diagnostic
failure

SCSI expansion box not
connected, loose
connections, or SCSI ID
conflicts. Connect the
SCSI expansion box,
check connections, and
run Setup.
SCSI hardware failure.
Replace SCSI device.

0021

xxxxOh optional
ROM bad
checksum = xx

DECpc 433 Workstation Service Guide

Correct the address
conflict or replace the
ROM chip.

2-9

Troubleshooting

Table 2-2. POST Error Messages (continued)

POST
Countdown
No.

Message
Error
Message
No.

Solution

060

83,82,80

LAN memory
failure

Replace system board.

8A,8B,8C,
89,87,85,
84,81,74,

LAN hardware
failure

Replace system board.

86
88

LAN 1/0 failure

Replace system board.

LAN inte!Tl!pt
failure

Replace system board.

LAN mouse
interrupt failure

Replace system board.

T~me-of.-day not

Run Setup and set the
time and date.

73,71

050

0019

set
040

0020

Keyboard is
locked

030

0022

To continue
press: Esc
To enter Setup
press: Fx

020

EnableNMI

010

Enable cache

000

Boot

2·10

Unlock the keyboard.

DECpc 433 Workstation :iervice Guide

Troubleshooting

Beep Codes
If POST finds an error condition and cannot display a message, the system
board speakd emits a series of beeps to ir.dicate the error condition. It also
writes a value into J/O port SOH for both fatal and not-fatal errors. No value
is written to 1/0 port 80H for intelligent graphics controller error conditions.
Beep codes are either fatal and not-fatal. Fatal errors prevent the system from
booting. Non-fatal errors allow the system to attempt a boot. For example, if
the speaker emits a 2-1-4 beep code (a burst of two beeps, a single beep, and a
burst of four beeps), bit three of the first 64 KB of DRAM failed its test Table
2-3 lists the beep codes for fatal errors and the values written to J/0 port 80H.
Table 2-4 lists the beep codes for non-fatal errors and the values written to 110
port80H.
Beep codes for the intelligent graphics controller are different in that only
long and short beeps are emitted. It is the number of ea1:h that identifies the
error condition. Table 2-5 lists the intelligent graphics controller beep codes.

DECpc 433 Workstation Service Guide

2-11

Troubleshoottng

Table 2-3. Fatal Error Beep Codes

Port

Beep
Code

Error

SOH

1-1-3

RTC write/read failure

1-1-4

ROM BIOS checksum failure

02H
03H

1-2-1

Programmable interval timer failure

04H

1-2-2

DMA initialization failure

OSH

1-2-3

OMA page register write/read failure

1-3-1

DRAM refresh verification failure

1-3-3

1st 64 KB DRAM chip or data line failure

1-3-4

1st 64 KB DRAM odd/even logic failure

1-4-1

1st 64 KB DRAM address line failure

1-4-2

lst 64 KB DRAM parity test in progres~failure

06H
08H
OAH
OBH
OCH
OOH

.......
"'- ~. J

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

2-12

Bit 0 ist 64 KB DRAM failure
Bit I 1st 64 KB DRAM failure
Bit 2 1st 64 KB DRAM failure
Bit 3 1st 64 KB DRAM failure
Bit 4 1st 64 KB DRAM failure
Bit 5 1st 64 KB DRAM failure

lOH

llH
12H
13H
14H
lSH

DECpc 433 Workstation Service Guide

Troubleshooting

Table 2-3. Fatal Error Beep Codes (continued)

Port

Beep
Code

Error

80H

2-2-3

Bit 6 1st 64 KB DRAM failure

16H

2-2-4

Bit 7 1st 64 KB DRAM failure

17H

2-3-1

Bit 8 1st 64 KB DRAM failure

18H

2-3-2

Bit 9 1st 64 KB DRAM failure

19H

2-3-3

Bit A 1st 64 KB DRAM failure

1AH

2-3-4

Bit B 1st 64 KB DRAM failure

lBH

2-4-1

Bit C 1st 64 KB DRAM failure

1CH

2-4-2

Bit D 1st 64 KB DRAM failure

1DH

2-4-3

Bit E 1st 64 KB DFAi\1 failure

1EH

2-4-4

Bit F 1st 64 KB DRAM failure

iFH

3-1-1

Slave DMA register failure

20H

3-1-2

Master DMA register~ ~ilure

21H

3-1-3

Master interrupt mask register failure

22H

3-1-4

Slave interrupt mask register failure

23H

3-2-4

Keyboard/mouse controller test failure

27H

Table 2-4. Non-Fatal Beep Codes

Beep
Code

Port
Error

3-3-4

Screen memory test failure

3-4-1

Screen initialization failure

80H
2BH
2CH

3-4-2

Screen retrace test failure

2DH

DECpc 433 Workstation Service Guide

2-13

Troubleshooting

Table 2-5. Intelligent Graphics Controller Beep Codes

Be~ps

Short
Beeps

Failed.
Test

VGARAMDAC
Monitor
detection

Long

VGA display
memory

Test
Description
R./W to palette registers
Incorrect loading on RGB
lines or BT459 test circuit
failed

R./W test to display memory
failed
No vertical retrace detected

VGA retrace
Other adapter

Xilinx

If CGA or MDA is installed,
POST tests and reports an
error if either fails
Xilinx components failed

programming
Program freq
· synth

SC22318 failed to program;
a R./W test performs

BT459 RAMDAC

GSPPOST
timeout

R/W test to i486 registers and
GSP external configuration
register

Frame grab HW

Test is made on full framegrab hardware; a known set
of data is placed in the VGA
display memory and a frame
is caught on the GSP side and
compared

GSPmemory

R/W test on VRAM and
DRAM on the GSP side

2-14

Intelligent
graphics
controller
disabled

Reserved video switch
selected

DECpc 433 Workstation Service Guide

•

Troubleshooting

Initial Troubleshooting
Follow this general procedure to initially troubleshoot components of your
DECpc 433 Workstation:
1.

Verify that power is applied by checking the power on
indicators (system box, SCSI expansion box, monitor,
and connected peripherals).

Check for loose cables and connections.

Tum the system on. If the system fails to boot, tum it
off, wait 20 seconds, and then tum it back on.

Observe any POST messages. Refer to Chapter 2,
"Power-on Self Test", for a listing of POST messages
and beep codes. Take corrective action.

Seek assistance. Contact your system administrator or
network coordinator for LAN related problems.

Seek assistance. Contact Digital Customer Service for
software and hardware problems.

If you need to return a failed part, pack it in its original
container and return it to Digital for service.

For your convenience, you can place orders by phone, by mail, or in person at
any Digital sales office.
Call 1-800-DIGITAL between 8:30 a.m. and 8:00 p.m. Easter:n time, or write to:
Digital Equipment Corporation

P.O. Box CS2008
Nashua, NH 03061

DECpc 433 Workstation Service Guide

2-15

Troubleshooting

lilllllllllllllSlllllll_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _......,..._........_..................................... . _ .

System Box Troubleshooting
Table 2-6 lists some possible problems, causes, and corrective actions for
troubleshooting the system box.

Table 2-6. System Box Troubleshooting

Problem

Possible Cause

Action

No response when the
system is turned on

System is not plugged
in

Tum off the syste·m,
plug it in, and then
tum it back on again

No power at the wall
outlet

Use another wall outlet

Video select switch is

Check video select
svvitch positions

Power is on, but there
is no monitor disolav
.,

. th
.•.
m
_.e wrong pos1Lmn

I for
tJ:te installed
ml>mtor
~-

Monitor is off

Power is on, your
Ethernet address is
installed on the server,
but the system hangs

2-16

Turn on the monitor

~·fonitor cable is

-Check all monitor

incorrectly installed

connections

The correct software is
not installed on the
server

Contact your system
administrator or
network coordinator

DECpc 433 Workstation Service Guide

Troubleshooting

--------------......----------------·--------------·-------·--Table 2-6. System Box Troubleshooting (con,tinued)

Problem

Possible Cause

Action

Power is on, your
Ethernet address is
installed on the server,
but the system hangs

Network failure

Contact your system
administrator or
network coordinator

Network select switch
is m the wrong
position
Operating software is
not installed on the
IDE hard disk drive

Correctly set the
network select switch

IDE hard disk is not
properly formatted or
the requested partition
does not exist

Format the IDE hard
disk drive or correctly
partition the IDE hard
disk drive using the
operating system

IDE hard disk drive
jumpers incorrectly sel

R1~fer to the supplied
vendor documentation

IDE drive type
incorrect

Run Setup to identify
the correct drive type
Chet·k all cable
connections

System does not boot
from the IDE hard disk
drive

Loose cables
System does not boot
from the floppy disk

Install the operating
system

Drive ID !ncorrectly set

Make sure the drive ID
is set to 1

Floppy disk does not
contain start-uo files

Insert tloppy disk with
start-uo
files
•

Floppy disk is worn or
damaged

Try another floppy
disk
..

Loose cables

Check all cable
connections

DECpc 433 Workstation Service Guide

2-17

Troubleshooting

Table 2--6. System Box Troubleshooting (continued)

Problem

Possible Cause

Action

No response to
keyboMd commands

Keyboard is password
protected

Enter the keyboard
password

Keyboard is not
connected

Connect the keyboard

Keyboard is connected
to the mouse port

ItoConnect
the keyboard
keyboard port

Disk Drives
able 2-7 lists some possible problems, causes, and corrective actions for
troubleshooting the system box disk drives.

·l

Table 2-7. Disk Drive Trr ..ableshooling

Problem

Possible Cause

Action

IDE hard disk drive
cannot read or write
information

Incorrect jumper
settings

Refer to the supplied
vendor documentation

Floppy disk cannoi:
read or write
information

---------- Form.at as required by

IDE hard disk drive is
not properly fonnatted
or partitioned

supplied operating
system

IDE drive type
incorrect

Run Setup to identify
the correct drive type

Floppy disk is not
formatted

Format the floppy disk

Floppy disk is worn or

Try another floppy
disk

damaged

Floppy disk is write~
protected

2-18

Slide the write-protect
switch so the hole is
not visible

OECpc 433 Workstation Service Guide

Troubleshooting

Monitor
Table 2-8 lists some possible problems, causes, and corrective actions for
troubleshooting the monitor.
Table 2-8. Monitor Troubleshooting

Problem

Possible Cause

Action

Monitor power
indicator is not on

Monitor is turned off

Tum on the monitor

Power cord is not
connected

Connect the power
cord to the system box
(or SCSI expansion
box, if applicable)
Contact your local
Digital service
representative

Power indicator is
defective
No monitor display

Screen displays
partially highlighted
characters
Distorted, rolling, or
flickering screen
display, or
wrong/uneven color

Color monitor
displaying
monochrome

Video select is in the
wrong position

Check the video switch
position

Configuration error
Video select switch is
in the wrong position

Run Setup
Check video switch
position

Monitor incorrectly
adjusted

Adjust accordingly

Video select switch is
in the wrong position

Check the video switch
position

Monitor signal cable
incorrectly installed

Straighten any bent
connector pins and
then reseat

System was turned on
before the monitor was
turned on

Tum off the system
box, tum on the
monitor, then tum the
system box back on

DECpc 433 Workstation Service Guide

2-19

Troubleshooting

SCSI Expansion Box
Table 2-9 lists some possible problems, causes, and corrective actions for
troubleshooting the SCSI expansion box.
Table 2-9. SCSI Expansion Box Troubleshooting

Problem
No response when the
system is powered up

Possible Cause

Action

System box is not
plugged in

Tum off the system
box, plug it in, and
then tum it back on
again
Tum off the system
box, plug in the SCSI
expansion box, and
then tum the system
box back on

SCSI expansion box
power cord is not
plugged into the
system box

SCSI expansion box
power-on indicator
does not light

2-20

No power at the wall
outlet

Use another wall outlet

SCSI expansion box is
not plugged in

Tum the system box
off, plug the SCSI
expansion box into the
system box, and then
tum the system box
back on

Power supply faiied

Contact Digital or an
authorized Digital
dealer

DECpc 433 Workstation Service Guide

Troubleshooting

Table :Z..9.

SCSI Expansion Box Troubleshooting (continued)

Problem

Possible Cause

Action

System does not boot
from a SCSI hard disk
drive

Operating system
software is not
installed on the SCSI
hard disk drive

Install the operating
system

Requested partition
does not exist

Partition the SCSI hard
disk drive and then
reload the operating
system
Refer to the device
installation kit
instructions
Refer to the device
installation kit
instructions on setting
SCSIIO's

SCSI hard disk drive
jumpers incorrect
SCSI ID conflicts

Terminating resistors
not removed from the
SCSI hard disk drive

Remove tenninating
resistors. Refer to the
supplied installation
kit instructions

External SCSI
terminator not
installed

Install the supplied
external SCSI
terminator
Run Setup

System not configured
for SCSI hard disk
operation

DECpc 433 Workstation Service Guide

2-21

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3
Sys tent Box FRU

Replacetnent
Introduction
This chapter contains a list of system box FRUs, FRU removal and replacement
instructions, and information regarding electrical shock and electrostatic
discharge (ESD) that should be read before beginning any procedure.

System Box FRUs
Table 3-1 lists the available FRUs for the DECpc 433 Workstation.
Table 3-1. System Box FRUs
r----='"-

FRU

DigitalPN#

Top cover, plastic

74-43364-01
74-43363-01
74-43361-01

Front bezel, plastic
Bottom cover, plastic
3.5" filler panel, plastic
Stand-off, metal
Chassis base, metal
Carrier, 3.5" peripheral device
Bracket, 2.5" drive

EMI shield, top (metal)

74-43362-01
74-43545-01
74-43546-01
74-43547-01
74-43781-01
74-43548-01

Lite pipe 2 (power on/off)

74-43551-01
74-435SO-Ol

Spacer, top shield (spider web), plastic

74-43693-01

Chassis base assembly with VO shield

29-28945-01

Panel, peripheral filler, metal

29-28945-01

Lite pipe I (disk activity)

DECpc 433 Workstation Service Guide

3-1

System Box FRU Replacement

Table 3-1. System Box FRUs (corrtinued)

FRU

DigitalPN#

Mother board/riser/8 MB

29-28952-01

Intelligent Graphics Controller

29-28953-01

Power supply assembly (105 W :ttt)

29-28939-01

SIMfvf, 1 MB x 9

29-2894~01

SIMM, 4 MB x 9

29-28941-01

Battery, 4.5 V de

29-28951-01

Fastener, tuflock

29-28947-01

Knob, video select, plastic

29-289-!P -01

Key, w/keylock (20 variations)

511111-01/-20

Floppy disk drive, 1.44 MB 3.5-inch

RX23-AA

IDE hard disk drive, 52 MB 3.~inch
IDE hard disk drive, 105 MB 3.5-inch
IDE hard disk drive, 40 MB 2.5-inc:h

PCWXR-BA

External cache module, 128 KB

PCWXR-BB
PC\\TXR-CA
PCWXM-M
PCWXM-AB

Ribbon cable, IDE 40-pin to 40-pin

17-03151-01

Fibbon cable, floppy disk drive (molded)

17-03152-01

Cable, IDE 44-pin to 40-pin

17-03173-01

External cache module, 64 KB

~able, !DE 44-pin to 44-pin
____ _,

- 17-03184-01
1-~--------

Cable, video (color)

17-03183-01

Cable, video (monochrome)

17-03172-01

Cord, power, 120 V ac, 15 A, US/Canad~/Japan

17-00083-39

I Cord, power, 240 V ac, 10 A, Europe

17-00199-21

Cord, power, 240 V ac, 10 A, United Kingdom

17-00209-15

Cord, power, 240 V ac, 10 A, Danish

17-00310-08

L Cord, power, 240 V ac, 10 A, Italian

17-00364-18

3-2

DECpc 433 Workstation Service Guide

System Box FRU Replacement

Table 3-1. System Box FRUs (continued)

FRU

DigitalPN#

Cord, power, 240 V ac, 10 A, Israeli

17-00457-16
17-00210-13
17-00456-16
17-00198-14
17-00442-25
17..00365-19

Cord, power, 240 V ac, 10 A, Swiss
Cord, power, 240 V ac, 10 A, India
Cord, power, 240 V ac, 10 A, Austrian
Cord, power, auxiliary, IEC pig-tail, US
Cord, power, auxiliary, IEC pig-tail, Intemation~

Before You Begin
WARNING
Risk of electrical shock. Failure to disconnect the
source of power before opening the covers can result
in personal injury.

CAUTION
Equipment damage. Electrostatic discharge (ESD)
can damage disk drives, other penpherals, integrated
circuits, and circuit boards. It is strongly
recommended that all removal and replacement be
done at an approved ESD workstation. If one is not
available, you can provide minimum ESD protection
by wearing an antistatic wrist strap attached to
rh
~c:cic:
al"f'\1tnrl
'llnrtlin
tT " ' " " i»•o ........ 1 ..... ,. .. ,,..,.
.., .........
._. .. ..,. o•
__ .. ,_ Ul'hi=>n
... ••-•• h... ...._..
..
U.lr.'lJ al\'-"""'l.A\UI OJ L>'\.""J.ll
~s.•l."fi

part.

DECpc 433 Workstation Service Guide

System Box FRU Replacement

Outside Cover
To remove the outside cover, see Figure 3-1 and do the following:

3-4

Tum off power to all devices connected to the system
box.

Tum off power to the system box.

Tag and disconnect all cables connected to external
devices.

Disconnect all system box power cords.

Unlock the system box outside cover.

Locate the two locking tabs below the outside cover
lock. Push in on the tabs to release the outside cover
while lifting.

i'.

Raise the outside cover to disengage the hinges from
the chassis and then remove the outside cover.

DECpc 433 Workstation Service Guide

System Box FRU Replacement

Locking Tab
Locking Tab

Figure 3-1. Removing the System Box Cover

DECpc 433 Workstation Service Guide

3-5

System Box FRU Replacement

To replace the outside cover, see Figure 3-2 and do the following:

3~6

Make sure no tools or loose parts are left inside or
around the chassis.

Position the outside cover over the chassis, then lower
the side opposite the locking tabs to engage the outside
cover hinges with the chassis.

Carefully lower the outside cover {making sure the
safety loop fits between the power supply and the rear
panel),until it engages the locking tabs (see Figure 3·3).

Push down on the outside cover until you hear the
locking tabs snap into place.

Push down on the front of the outside cover (above the
front panel) to seat the two locking detents.

Push down on the outside cover (above the rear panel)
to seat the rear locking detent.

Lock the system box outside cover.

Connect all previously removed external cables and
power cables and then remove identification tags.

DECpc 433 Workstation Service Guide

•

System Box FRU Replacement

OM-00668·3

Figure 3-2. Replacing the System Box Cover

DECpc 4.33 Workstation Service Guide

3.7

•

System Box FRU Replacement

•
OM-00701

Figure 3-3. Power Cord Safety Loop Location

DECpc 433 Workstation Service Guide

•

System Box FRU Replacement

Chassis Inner Cover
To remove the chassis inner cover, see Figure 3-4 and do the following:
1.

Remove the system box cover.

Remove the five screws that secure the chassis inner
cover to the intelligent graphics controller.

Lift the locking tab and then pull the inner cover
toward the power supply to free the locking tabs.

Remove the inner cover from the chassis.

DECpc 433 Workstation Service Guide

3-9

•

System Box FRU Replacement

OM-00669·2

Figure 3-4. Removing the Chassis Inner Cover

3-10

DECpc 433 Workstation Service Guide

System Box FRU Replacement

To replace the chassis inner cover, see Figure 3-5 and do the following:
1.

Place the chassis inner cover over the front and back
locking tab openings and then slide the cover away
from the power supply to :1..1ate locking tabs.

Secure the chassis inner cover to the intelligent
graphics controller using the five previously removed
screws.

Replace the system box cover.

DECpc 433 Workstation Service Guide

3-11

•

System Box FRU Replacement

Locking Tab

•
OM-00669-3

figure 3-5. Replacing the Inner Cover

3-U

DECpc 433 Workstation Service Guide

System Box FRU Replacement

2.5-Inch Hard Disk Drive
To remove the 25-inch hard disk drive, do the following:
1.

Remove the system box outside cover.

Remove the chassis inner cover.

Tag and disconnect the interface cable to the 2.5-inch
hard disk drive. Note pin I locations and the red cabie
stripe location (see Figure 3-6).

Lift the 2.5-inch mounting tray and remove it from the
chassis (see Figure 3-6).

DECpc 433 Workstation Service Guide

3-13

•

System Box FRU Replacement

Mounting
Post

Red
Wire

OM-00721-3

Figure 3-6. Removing the 2.5-Inch Hard Disk Drive

-~-

3.14

DECpc 433 Workstation Service Guide

System Box FRU Replacement

Remove the mounting tray screws, and then remove
the 2.5-inch hard disk drive (Figure 3-7).

011.4-00720

Figure 3-7. Removing the 2.5-Inch Hard Disk Drive
From the Mounting Tray

DECpc 433 Workstation Service Guide

3-15

System Box FRU Replacement

To replace the 2.5-inch hard disk drive, do the following:
1.

Attach the 2.S..inch hard disk drive to its mounting tray.
Make sure the drive connector faces away from the two
mounting hooks (Figure 3-7).

Position the 2.S..inch harri disk in the chassis. Make
sure the mounting post and mounting hooks are
correctly positioned (Figure 3-6).

Press the mounting tray into its seated position.

Connect the interface cable. Make sure pin 1 and the
red cable stripe are in the position noted during
removal.

fl.

Replace chassis inner cover.

Replace the system box outside cover.

Run Setup if the drive type changed.

3.5-Inch Mass Storage Device
To remove a 3.5-inch mass storage device, do the following:

...

Remove the chassis inner cover.

If installed, remove the 2.5-inch hard disk drive.

3-16

DECpc 433 Workstation Service Guide

System Box FRU Replacement

Tag and disconnect all cables to the mass storage
device. Note the pin I location and the red cable stripe
location (Figure 3-8).

Power
Connector - ·

OM-00673·3

Figure 3...S. Fluppy Disk Drive Re.u Connections

DECpc 433 Worksution Service Guide

System Box FRU Replacement

Lift up on the disk drive mounting tray and remove it
from the chassis (Figure 3-9).

Lockins Tabs
OM-0067?-3

Figure 3-9. Removing a 3.5-lnch Mass Storage Device

3-18

DECpc 43? Wo;:·:;.station Service Guide

System Box FRU Replacement

Remove the mounting tray screws, and then remove
the mass storage device (see Figure 3-10).

OM-00671-3

Figure 3-10. Removing a 3.5-lnch Mass Storage Device
From a Mounting Tray

DECpc 433 Workstation Service Guide

3-19

System Box FRU Replacement

_ _ _ _ _ _ _ _ _ _ _ _llllllllllli_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _......,_ _._.._ _ _ _ _ _ _ _ _ _ _ _. . . . . .

To replace a 3.5-inch mass storage device, do the following:
1.

If your are replacing a 3.5-inch floppy disk drive, set the
drive ID switch to 1 (see Figure 3-11).

Ot.1-00636·2

Figure 3-11. SeUing the Floppy Disk ID Select Switch

Attach the mass storage device to the mounting tray
(see Figure 3-10).

Position the mass storage device mounting tray inside
the chassis. Make sur~ the mounting post and
mounting hooks are correctly positioned (Fig1ue 3-9).

Press the mounting tray into its seated position.

3-20

DECpc 43~ Workstation Service Guide

System Box FRU Replacement

...................1111111111111111111111.-.-------------------------------------5.

Connect all cables and remove tags. Make sure pin 1
and the red cable stripe are in the position noted
during removal. See Figure 3-8 to connect a floppy disk
drive and Figure 3-12 to connect a hard disk drive.

Replace the 2.S..inch hard disk drive.

Replace the inner chassis cover.

Replace the system box outside cover.

Run Setup if the installed mass storage device is a
different drive type.

DECpc 433 Workstation Service Guide

3-21

•

System Box FRU Replacement

•
OM-00074·3

Figure 3-12. IDE Hard Drive Rear Connections

3-22

DECpc 433 Workstation Service Guide

System Box FRU Replacement

System Battery
To remove the system battery, see Figure 3-13 and do the following:

OM-00649

Figure 3-13. Removing and Replacing the System Battery

DECpc 433 Workstation Service Guide

3-23

System Box FRU Replacement

Enter Setup and record all system configuration
information settings.

Remove the system box outside cover.

Remove the chassis inner cover.

Remove the 2.5-inch hard disk drive (if applicable).

Disconnect the battery cable from header JS.

Pull the battery from its mounting pad (Velcro fastener)
located inside the chassis front panel.

To replace the system battery do the following:
1.

Place the replacement battery on the mounting pad.

Connect the battery cable to header JS.

Replace the 2.5-inch hard disk drive (if appiicabie).

Replace the chassis inner cover.

Replace the system box outside cover

Run Setup to restore all system configuration
information.

3-24

OECpc 433 Workstation Service Guide

System Box FRU Replacement

Intelligent Graphics Controller
To remove the intelligent graphics controller, see Figure 3-14 and do the
following:

Remove the system box outside cover.

Remove the chassis inner cover.

Lift up on the intelligent graphics controller until it5
connector is free of system board connector. There is
an interconnect board (riser card) located between the
controller and the system board. Make sure you retain
it.

DECpc 433 Workstation Service Guide

System Box FRU Replacement

Ot.4-00723·2

Figure 3·14. Removing the Intelligent Graphics Controller

3-26

DECpc 433 Workstation Service Guide

System Box FRU Replacement

To replace the intelligent graphics controller, see Figure 3-15 and do the
following:
1.

Install the interconnect board (riser card) into the
system ~ard connector.

Position the intelligent graphics controller over
mounting standoffs and interconnect board (riser card).

Gently press down on the intelligent graphics
controller until its connector seats.

Replace the inner chassis cover.

Replace the system box outside cover.

DECpc 433 Workstation Service Guide

3-27

System Box FRU Replacement

I
I
I
I

I
I
I

•
OM-00723-3

Figure 3-15. Installing the Intelligent Graphics Controller

3-28

DECpc 433 Workstation Service Guide

System Box FRU Replacement

External Cache
To remove the external cache, do the following:
1.

Remove the system box outside cover.

Remove the chassis inner cover.

Remove intelligent graphics controller (Figure 3-14).

Carefully remove the external cache module and place
it in a suitable antistatic package (Figure 3-16).

To replace the external cache, do the following:
1.

Remove the external cache from its antistatic package,
being careful not to touch the pins on the chip.

Align the external cache's pins with the socket contacts.
Make sure the external cache's guide pin is at the
position shown in Figure 3-16.

Press down on the external cache until it firmly seats in
the socket

Replace the intelligent graphics controller (Figure 3-14).

Replace the chassis inner cover.

Replace the system box outside cover.

DECpc 433 Workstation Service Guide

3-29

System Box FRU Replacement

•
OM-00648

• _ ....
&Jue
...
11~ -'l-16. ..........
. , rnal Cache
11 a
OVI.1a:.
a. ,, .., ;:nlacinl>
a.uc- .,.,
· ... ,..-nu•'--.r!g--go

3-30

. Guide
DECpc 433 Workstation Service

System Box FRU Replacement

Power Supply
To remove the power supply, see Figure 3-17 and do the following:
1.

Remove the system box outside covel'.

Remove the chassis inner cover.

Remove the intelligent graphics controller.

Tag and disconnect the power supply connectors from
all mass storage devices and the system board.

Loosen the two securing fasteners.

Using a flat-blade screwdriver, pry at the position
shown in Figure 3-17 until the two fasteners are free of
chassis.

Using a flat-blade screwdriver, gently pry directly
beneath each fastener to remove them from the power
supply

Carefully tilt the power supply toward the intelligent
graphics controller's standoffs and then lift it from the
chassis.

DECpc 433 Workstation Servic'~ Guide

3-31

System Box FRU Replacement

OM-0..')728·2

Figure 3-17. Removing the Power Supply
To replace the power supply, see Figure 3-18 and do the folJowing:
1.

3-32

Set the power supply under the tabs at the bottom of
the chassis.

DECpc 433 Workstation Service G1l'ide

System Box FRU Repla~'.ement

Rotate power supply into the two fastener holes line
up. Make sure the positioning tab is between the
power supply chassis and system box chassis. Also,
make sure no cables are being
' - .pinched.

OM-00728·3

Figure 3-18. Replacing the Power Supply

DECpc 433 Workstation Service Guide

3.33

________________________

...............................................................
.._.
System Box FRU Replacement

Press both fasteners into place and then fully tighten
the two screws.

Connect all previously removed power cables to the
mass storage devices and the system board. Remove aU
identification tags.

Replace the intelligent graphics controller.

Replace the chassis inner cover.

Replace the system box outside cover.

SIMMs
Both the ~ystem board and the intelligent graphics controller contain SIMMs.
Removing and replacing the SIMMs on either the system board or the
intelligent graphics controller is the same. It might be necessary to remove
additional SIMMs to get sufficient clearance to pull the SIMM from its socket.
To remove SIMMs, see Figure 3-19 and do the following:

CAUTION
Apply only enough pressure on the retaining dips to
release the SIMM. Too much pressure can break the
retaining dips or damage the socket slot
1.

Remove the system box outside cover.

Remove the chassis inner cover.

Remove the intelligent graphics controller.

Open the retaining dips to free the SIMM.

Lift the SIMM from its socket slot.

3-34

DECpc 433 Worksbtion Service Guide

System Box FRU Repldcement

.....,..... __,....,.. ...\\
\\
\\
\\
\\
\\
II

\\
\\

Retaining
Clip
OM-00724·3

Figure 3-19. Removing a SIMM
To replace a SIMM, see Figure 3-20 and do the following:
1.

Insert the SIMM into the socket slot and press down
firmly while maintaining the proper insertion angle.

When the SIMM seats, hold it at each end and gently
push the top edge toward the retaining clips until it
snaps into place.

If the SIMM does not seat, gently spread the retaining
clips enough to pull the top edge of the SIMM away
from the clips and then reseat.

DECpc 433 Workstation Servke Guide

3-35

•

System Box FRU Replacement

Replace the intelligent graphics controller.

Repiace the chassis inner cover.

Replace the system box outside cover.

Installed
Position

\ Insertion
Angle

OM-006715·3

Figure 3-20. Replacing a SIMM

3-36

DECpc 433 Workstation Service Guide

System Box FRU Replacement

System Board
To remove the system board, see Figure 3-21 and do the following:
1.

Rur. Setup and record the system configuration
settings.

Remove system box outside cover and inner chassis
cover.

Remove the intelligent graphics controller.

Remove the 2.5-inch hard disk and the 3.5-inch mass
storage device (if applicable).

Remove the six standoffs.

Tag and disconnect the power supply cable to the
system board.

Tag and disconnect the system battery connector.

Carefully pry the system board at the three snap
standoffs. Pry at the end snap standoff first, and then
the center snap standoff.

Lift the system board from the chassis and place it in an
anti-static container.

DECpc 433 Workstation Service Guide

System Hox FRU Replacement

I
I
'

/Standoff

t
'

I
I

•
i:>M-00725-2

Figure 3-21. Removing the System Board

3-38

DECpc 433 Workstation Service Guide

System Box FRU Replacement

To replttce the system board, see Figure 3-22 and do the following:
1.

Set the system board in position over the snap standoffs
and then press down on the system board around the
standoffs.

Connect the system battery and power supply
C« ·1nectors. Remove all identification tags.

Repldce the six standoffs.

Replace the 3.5-inch and 2.5-inch mass storage device (if
applicable).

Replace the intelligent graphics controller.

Replace the inner chassis cover and system box outside
cover.

Run Setup to configure the system board. Refer to
Appendix C, "ROM-based Setup" for details on running
Setup.

DECpc 433 Workstation Servic?. Guide

3-39

System Box FRU Replacement

I
'

~Standoff

OM-00725-3

Figure 3-22. Replacing the System Board

3-40

DECpc 433 Workstation Service Guide

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SCSI Expansion Box
FRU Replacetnent
Introduction
This chapter contains a list of SCSI expansion box FRUs, FRU removal and
replacement instructions, and infonnation regarding electrical shock and
electrostatic discharge (ESD) that should be read before beginning any
procedure.

SCSI Expansion Box FRUs
Table 4-1 lists the available FRUs for the SCSI expansion box.
Table 4-1. SCSI Expansion Box FRUs

FRU

Digital PN#

Front bezel, plast . . ·'"

74-43560-01

Top cover, plastic

74-43561-01

Bottom cover, plastic

74-43552-01

5.25-inch filler panel, plastic

74-43565-01

EMI top cover, metal

74-43553-01

3.5-inch drive carrier

74-43556-01

Key, w/keylock (20 variations)

511111-0V-o

Chassis base, metal

74-43558-01

DECpc 433 Workstation Service Guide

4-1

•

SCSI ~<pansion
Box PRU Replacement
_,,

T:tble 4-1. SCSI Expansion Box FRUs (continued)

FRU

DigitalPN#

5.25-inch drive bracket

74-43359-01
74-43562-01
29-29179-01
17-03153-01
17-03149-01

1---

Lite pipe (power on/off)
Power S~£ply assembly 63 W
SCSI cable, exte1nal
SCSI cable, internal
Auxiliary power cord, IEC pig-tail, US

12-35759-01
17..()()442-30

Auxiliary power cord, IEC pig-tail, International

17-00365-22

External SCSI terminator/connector

Before You Begin
WARNING
Risk of electrical shock. Failure to disconnect power
before opening the covers can result in personal
injury.

CAUTION
Equipment damage. Electrostatic discharge (ESD)
can da.'nage disk drives, other peripherals, integrated
circuits, and circuit boards. It is strongly
recommended that all removal and replacement be
done at an approved ESD workstation. If one is not
available, you can provide minimum ESD protection
by wearing an antistatic wrist strap attached to
chassis ground when handling any internal system

part

4-2

DECpc 433 Workstation Sen•ke Guide

SCSI Expansion Box FRU Replacement

Cover
To remove the cover, see Figure4-l and do the following:
1.

Tum off the power to all devices connected to the
system box.

Tum off the power to the system box.

Disconnect the intemal SCSI cable c1.>nnected to the
SCSI expansion box.

Disconnect the SCSI expansion box power cord.

Unlock the cover.

Locate the two locking tabs below the cover lock. Push
in on the tabs to release the cover whiie lifting.

Raise the cover to disengage hinges from the chassis
and then remove the cover.

DECpc 433 Workstation Service Guide

4-3

SCSI Expansion Box FRU Replacement

Locking Tab

OM-00689-2

Figure 4-1. Removing the SCSI Expansion Box Cover

4-4

DECpc 433 Workstation Service Guide

•

SCSI Expansion Box FRU Replacement

To replace the cover, see Figure 4-2 and do the following:
1.

Make sure no tools or loose parts are left around or

inside the chassis.
2.

Position the cover over the chassis, then lower the side
opposite the locking tabs to engage th,? cover hinges
with the chassis.

Carefully lower the cover until it engage~' the locking
tabs.

Push down on the cover until you hear the locking tabs
snap into place.

Push down on the cover (above the front pane?) to seat
the two front locking detents.

Push down on the cover (above the rear panel) to seat
the rear locking detent.

Lock the cover.

Connect all previously removed external cables and
power cables. Remove all identification tags.

DECpc 433 Workstation Service Guide

SCSI Expansion Box FRU Replacement

OM-006811-3

Figure 4-2. Repladng the SCSI Expansion Box Cover

DECpc 433 Workstation Service Guide

SCSI Expansion Box FRU Replacement

~--------------==--------------------------------------

Removing SCSI Devices (5.25-lnch
Mounting Trays)
Both 5.25-inch mounting trays can hold either a 5.25-inch SCSI device or a
3.5-inch SCSI device. The removal and replacement procedures for either is
the same, only the mounting position in the mounting tray is different.
To remove a SCSI device, do the following:

...a.
2.

Remove the cover.
Tag and disconnect the power cable and internal SCSI
cable (see Figure 4-3).

DECpc 433 Workstation Service Guide

4-7

SCSI Expansion Box FRU Replacement

SCSI
Connector

•

Power
Connector
OM-00694-3

Figure 4-3. SCSI Device Rear Connections (5.25-Inch
Mounting Tray)

4-8

DECpc 433 Workstation Service Guide

SCSI Expansion Box FRU Replacement

Remove the mounting tray s1.:rt:ws and then iift L°le
mounting tray from the chassis (see Figure 4-4).

I
I

1......-:::

...____

j~l

Ot.4·00693

Figure 4-4. Removing a SCSI Device (5.25-Inch Mounting
Tray

DECpc 433 Workstation Service Guide

4-9

SCSI Expansion Box FRU Replacement

Remove the SCSI device from the mounting tray (see
Figure 4-5).

•
OM-00691

Figure 4-5. Removing a SCSI Device from a 5.25-Inch
Mounting Tray

DECpc 433 Workstation Service Guide

SCSI Expansion Box FRU Replacement

To replace a SCSI device, do the following:
1.

Attach the SCSI device to the mounting tray (see Figure
4-5 if you are mounting a 5.25-inch SCSI device and
Figure 4-6 if your are mounting a 3.25-inch SCSI devi.ce
in a 5.25-inch tray.

: :l:
I
I

I /I
1/ I
I
I
I
I
I
/i

I
I
I
I
I

.I
I
I

1/ J.
I

\'!!!!'

~
II!!!/

1,1

a
4

a
4
OM-00692

Figure 4-6. Attaching a 3.5-lnch SCSI Device to a 5.25-lnch
Mounting Tray
2.

Position the mounting tray in the chassis and secure it
with the mounting screws previously removed.

OECpc 433 Workstation Service Guide

4-11

SCSI Expansion Box FRU Replacement

Connect the power and internal SCSI connectors and
then remove all identification tags (see Figure 4-3).

R~place the cover.

Removing S CSI Devices (3.5-Inch
Mounting TJray)
1

The following procedures provide instructions for removing and replacing a
3.5-inch SCSI device.
To remove a 3.5-inch SCSI device, do the following:

Remove the cover.

Tag and disconnect the power cable and internal SCSI
cable (see Figu1re 4-7).

4-12

DECpc 433 Workstation Service Guide

SCSI Expansion Box FRU Replacement
llllillll\. . . . . . . . . . . . . . . . . . . . . . . . . . . ._.... . . . . . . . . . . . . . . . . . . . . . . . . .1111111111. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .

S~SI

lntflrnal
Cable
QM.00698-3

Figure 4-7. SCSI Device Rear Connections (3.5-Inch
Mounting Tray)

DECpc 433 Workstation Service Guide

4-13

•

SCSI Expansion Box FRU Replacement

Remove the mounting tray screw and then lift the
mounting tray from the chassis (see Figure 4-8).

OM-00697

Figure 4-8. Removing a SCSI Device (3.5-Inch Mounting

Tray)

4-14

DECpc 433 Wod<station Service Guide

SCSI Expansion Box FRU Replac·ement

Remove the SCSI device from the mounting tray (see
Figure 4-9).

I
I

I
I
I
I
I

I
:

'I
I

1~1

I
I

I
;
I

I
I
I

®l~iI

a
I

4
Ot.1·00696

Figure 4-9. Removing a SCSI Device From a 3.5-lnch
~dounting Tray

DECpc 433 Workstation Service Guide

4-15

SCSI Expansion Box FRU Replacement

To replace a 3.S..inch SCSI device, do the following:

Attach the SCSI device to the mounting tray (see Figure
4-9.

Position the mounting tray in the chassis and secure it
with the mounting screw previously removed (see
Figure4-8.

Connect the power and internal SCSI connectors and
then remove all identification tags (see Figure 4-7).

Replace the cover.

Power Supply
To remove the power supply, do the following:
1.

Remove the cover.

Tag and disconnect the power supply cables to all SCSI
devices.

See figure 4-10 and remove the two power supply
retaining screws.

Carefully lift the power supply from the chassis.

4-16

DECpc 433 Workstation Service Guide

SCSI Expansion Box FRU Replacement

OM-00126

Figure 4-10. SCSI Power Supply Mounting

DECpc 433 Workstation Service Guide

4-17

SCSI Expansion Box FRU Replacement

To replace the power supply, do the following:
1.

Set power supply in the mounting position and replace
both retaining screws (see Figure 4-10).

Cunneci the power cables and data cables to the SCSI
devices and then remove all identification tags.

Replace the cover.

4-18

DECpc 433 Workstation Service Guide

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Power Consulllption
Introduction
This appendix contains power requirement infonnatic:i for the system box
and the SCSI expansion box. Also included are current requirements for the
system board and components that obtain power from the system board.

Power Requirements
Table A-1 lists the power requirements for the system box and the SCSI
expansion box.
Table A-1. Power Requirements

Voltage
Source

Maximum
Range

!nput Current

100-120 V ac

90-132 V ac:

lOA

200-240 V ac

180- 264 V ac

DECpc 433 Workstation Service Guide

Frequency
Limits
47 -63 Hz
47-63 Hz

A-1

Power Consumption

System Board Current Requirements
Table A-2 lists the nominal current requirements for the system board and the
components that obtain power from the system board.

Table A-2. Current Requirements

Assemblies

+5.0 V de

+12.0V de

-12.0 V de

System board with
8 MB of system
memory

5.3A

2.SA

Intelligent
graphics controller

0.14A

1.44 MB floppy
disk drive

O.ISA

0.3A

IDE fixed disk
drive

0.3A

A-2

DECpc 433 Workstation Service Guide

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Interface Connectors
Introduction
This appendix contains interface infonnation for these system connectors:
•

System box

•

Serial ports

•

Parallel port

•

Keyboard/mouse

•

Monitor

•

SCSibox

System Box Connectors
The system box has seven external connectors: two 9-pin D-typ~ serial
connectors 02A, J2B), one 25-pin D-type parallel printer connector 010), one 6pin mini-DIN keyboard connector 07), one 6-pin mini-DIN mouse connector
08), one 15-pin D-type video connector(Pl), and one 50-pin SCSI-2 interface
connector 06). Figure B-1 shows the locations of pin 1 for each of these
connectors.

DECpc 433 Workstation Service Guide

B-1

Interface Connectors

Pin 1

Pin 1 Pin 1
OM-00595-3

figure B-1. External Connector Pin 1 Locations

Serial Ports
Table B-1 lists the pin assignments for the serial ports.

Table 8-1. Serial Port Pinouts 02A, J28)

Pin No.

Function

Signal
DCD
RXD•

TXD

Transmit data

DTR"'

Data terminal ready

GND

Ground

f)C.R
......

Data set ready

RTS*
CTS
RING

- ..,,,_'tw."'°'~'" i.\.I "'c-,..
~ J.lU

8
9

B-2

Data carrier detect
Receive data

»................,..

Clear to send

Ring indicator

DECpc 433 Workstation Service Guide

Interface Connectors

Parallel Port
Table B-2 lists the pin assignments for the parallel port.
Table B-2. Parallel Port Pinouts (JlO)

Pin No.

Signal
STB-R

PRDOR
PRDlR
PRD2R
PRD3R
PRD4R
PRDSR
PRD6R
PRD7R
ACK•
BUSY
PE
SLCT
AFD-R
ERR*
INIT-R

SLIN-R

3
4

5
6
7
8

10
11
12
13

14
15

Iis-25

·-

IGND

DECpc 433 Workstation Service Guide

Function
Strobe
Printer data bit zero
Printer data bit one
Printer data bit two
Printer data bit three
Printer data bit four
Printer data bit five
Printer data bit six
Printer data bit seven
Acknowledge
Busy
Paper end
Select
Auto feed
Error
Initialize printer
. SdE_>c:t innut
Ground r

B-3

Interface Connectors

Kevboard and Mouse
""

Table B-3 lists the pin assignments for the keyboard and mouse connectors.
Table B-3. Keyboard/Mouse Pinouts (J7, JS)

Pin No.
1

Signal
Data
Reserved
Ground

B-4

DECpc 433 Workstation Service Guide

Interface Connt;;>rtors
--RiiCIKIKUiil1llriinJ.l'dftlW"''llll!!EOllOIMollfowolll'MW- - - - - - - - - - - - - - - - - - -

Monitor Connector
Table B-4 lists pin assignments for the monitor connector.
Table B-4. Monitor Connector Pinouts (Pl)

Pin No.

Function

Red video

Green video

Blue video

Monitor ID bit 2

Ground

Red return (ground)

Green return (ground)

Blue return (ground)

9
10

Key position (no pin)

Monitor ID bit 0

Monitor ID bit 1

Horizontal sync

Vertical sync

Not used

Sync return (ground}

DECpc 433 Workstation Service Guide

B-5

lnterfa(e Connectors

SCSI Connector
Table B-5 lists the pin assignments for the SCSI connector.
Table B-5. SCSI Connector Pinouts (J6)

Pin No.

Signal

1-11

Ground

12-14

Not connected

15-25

Ground

26-33

Data bits 0 through 7

34-35

Data bit parity

Ground

Not connected
Termination power

38
39
40
41

Not connected
Ground
Attention

Ground

Busy

- Ack.nowiedge

45
46
47

Reset

ControVdata

Request

Input/output

B-6

Message
Select

OECpc 433 Workstation Service Guide

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ROM-Based Setup
Introduction
This appendix briefly describes the Setup utility and configuration settings it
can change. Setup also displays information about configuration settings that
you can not change.
Setup is a 1lOM-based utility that modifies system configuration settings. The
settings are stored in non-volatile RAM and take effect each time you boot the
system. In addition, the Setup utility contains a system infonnation menu
that displays L.Aal\J and secondary cache infonnation. The configuration
settings include:
•

Time and date

•

Setup screen language

•

Floppy disk and hard disk drive type

•

Amount of base memory and extended memory

•

CPU speed

•

SCSI hard disk enable/disable

•

User definable hard disk drives

•

LAN boot enable/disable

•

LAN timeout

•

Shadow BIOS ROM enable/disable

•

Cache enable/disable

•

Password enable/disable

DECpc 433 Workstation Service Guide

C-1

ROM-Based Setup

Running Setup
The Setup utility is permanently stored in ROM and can be run with or
without the operating system and is entered during POST. To run the setup
utility:
1.

Remove power.

Apply power.

At POST numeric sequen~e 100, you are prompted to
enter Setup. Press the appropriate function key.

'1
-..

TL.

f tw C' •
.
r•
,,.. .. •
..
•
,
1.11e &.:
uiSL 0 l . "0 .:iei:up SCtt:ehS, rtgurt: \..- J, IS utsp1ayeu
L

in the language stored in non-volatile RAM (you can
change the language using Setup).
5.

C-2

To display the second Setup screen (Figure C-2), press
the Page Down key. To redisplay the first setup screen,
press the Page Up key.

DECpc 433 Workstation Service Guide

ROM-Based Setup

.--·----··-·--------·---------- ---------·------...--..----·--·---- Time:
Date:

15:23:33
14 January

language: English
Diskette: Not Installed
JOE Disk: Not Ins ta 11 ed
0!1se Memory: 640 KB
Lr.tended Memory: 7168 KB
CPU Speed: Fast

___..

Page

_______________ -- ---

l of 2

19::11
r

Disk Subsystem----------i
Cylinders: 949
Heads:
9
Precompensation: -1
Land Zone: 950
Sectors: 34
Size: 141

L_ _ _ _ _ _ _ _ _ - - - - - - - - - .. - - - - ..· - - - - · - - - - - - '

OM-00600

Figure C-1. Setup Screen One

DECpc 433 Worksbtion Service Guide

•

ROM-Based Setup

---··-----·-

·-----

Page

2 of 2

SCSI Hard Disk: Disabled
User Definable Drivers: 48 and 49
LAN Boot: Enabled
LAN Timeout: 30 Seconds
Shadow: Enabled
Cache: Enabled
Password: Not installed

[

]

Esc

]

Sys Info

11-p;u;;~
I~[+/Field_
Va.lue _J
g:___
L__~a

OM-00599

Figure C-2. Setup Screen Two

C-4

DECpc 433 Workstation Service Guide

ROM-Based Setup

Changing Configuration Settings
Fours keys change configuration settings: up arrow, down arrow, + and -.
The up and down arrow keys select the configuration settings to change, the
+ and - keys select the configuration settings options. There are some
configuration settings that you can not change; therefore, they are not
selectable. To change configuration settings:
1.

Press the Page Up and Page Down keys to display the
Setup screen that contains the configuration settings
you want to change.

Press the up and down arrow keys to select the
configuration settings you want to change.

Press the + and - keys to select the configuration
setting option. Each key press moves to the next
option. You can hold down either key to change values
continuously.
or

Press the + and - keys to select the configuration
setting option and enter the new configuration setting
ortion.

DECpc 433 Workstation Service Guide

C-5

ROM-Based Setup

Configuration Setting Descriptions

•

The following paragraphs briefly describe the configuration settings set by
the Setup utility.

Time
This configuration setting specifies the current system time. It contains three
changeable fields: hours, minutes, and seconds.

Date
This configuration setting specifies the current system date. It contains three
fields: date of the month, month, and year.

Language
This configuration setting specifies the language in which the setup screens
appear. Options are English, French, German, Italiar,, and Spanish

Diskette
This configuration setting specifies the floppy disk drive type installed as
drive A. There are two options: Not Installed and 3.5", 1.44 MB.

C-6

DECpc 433 Workstation Service Guide

•

ROM-Based Setup

IDE Disk
This configuration setting specifies the IDE hard disk type. Once selected, the
parameters for that drive type appear on the screen under Disk Subsystem.
Refer to the hard disk drive manufacturer's documentation for drive type
information.

CAUTION
The system BIOS cannot determine the type of IDE
hard disk installed. If this configuration is not
correct, the system BIOS can not recognize the
installed IDE hard disk drive.

Base Memory
This configuration setting is always 640 KB unless an error is detected. If an
error is detected, Setup determines the amount of actual base memory found
and inserts this value.

Extended Memory
This configuration setting specifies the amount of extended memory on the
system board. The amount is automatically determined and you cannot
modify its size.

CPU Speed
This configuration setting selects CPU operating speed. There are two
options: fast and slow. Fast is 33 MHz and slow is 8 MHz. You must also
disable the cache prior to selecting slow mode. The cache is enabled/disabled
with the Setup utility.

DECpc 433 Workstation Service Guide

C-7

•

ROM-Based Setup

SCSI Hard Drive
This configuration setting enables or disables the SCSI BIOS. Enable the SCSI
BIOS if a SCSI hard disk drive is installed.

User Definable Drivers
This configuration setting allows the user to define IDE hard disk parameters.
There are two options: 48 and 49, and 2 and 3. Select 48 and 49, unless there
is a conflict with your network. If you select 2 and 3, make sure to enable
shadow. After selecting a type, return to setup screen 1 and enter the Disk
Subsystem options.

LAN Boot
This configuration setting enables or disables the LAN boot process. There
are two options: enabled and disabled.
NOTE

Uniess your system is equipped with a floppy disk
drive or a hard disk drive (IDE or SCSI), you will
need to enable this option.

LAN Timeout
This configuration setting specifies LAN timeout values in seconds. There are
two options: 150 and 30. Choose the 150 second timeout value if more than
eight systems are on the network. Otherwise, choose the 30 second timeout
value.

C-8

DECpc 433 Workstation Service Guide

•

ROM-Based Setup

Shadow
This configuration setting enables or di~ables shadow memory. Shadow
memory is a write-protected portion of DRAM that, when enabled, contains a
copy of tl,e system and SCSI BIOS, or the video BIOS. Shadow memory has
the same addresses as the BIOS ROM locations. Shadow increases system
perfonnance because the BIOS instructions are in fast DRAM instead of ROM.

NOTE
You must enable shadowing before selecting user
definable driver option 2 and 3.

Cache
This configuration setting enables or disables the i486 microprocessor internal
cache and the optional external cache. Enabling the caches significantly
improves system performance by reducing the average number of wait states
seen by the i486 microprocessor.

Password
This configuration setting allows you to set a system password.

System Information Menu
Pr·~ssing the F2 function key displays the system information menu.

This
menu contains the LAN address, the type selected LAN media, and whether
or not the system found a secondary c:ache. These configuration settings are
not changeable.

Exiting Setup
After all configuration setting changes are entered, exit Setup by selecting one
of the exit options displayed on the ..,.. Exiting Setup ..,.. menu (see
Figure C-3). Press the Esc key to display the menu.
DECpc 433 Workstation Service Guide

C-9

ROM-Based Setup

NOTE
Aft~r the system boots, make sure POST completed
with no error4i (000 will be displayed on the screen).
If POST failed to complete, take the appropriate
action to correct any errors.

[

----------

·-----------------------

-------~-------------

~----------------------

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

** Exiting SETUP **
Lan
Dis
IDE
Base t1
Extended p.tj
CPU

Continue with SETUP.
Save values, exit SETUP, and reboot.
Load default values for all pages.
Abort SETUP without saving values.

i--------~~~~-~~~~~~~~~~~~~~---~~~~~~~--l

I Co;';'°"· Jl~~ - l [--E-] :~:~:lt• J[=:;;~:n]

0~-00601

Figure C-3. Exiting Setup Menu

C-10

DECpc 433 Workstation Service Guide

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Device Mapping
Introduction
Tables D-1 through D-4 contain information about the memory map, 1/0
address map, interrupt map, and LAN memory map, respectively.
Table D-1. System Memory Map

Address
Range (in hex)
0010 0000 to
02FFFFFF
OOOFOOOO to
OOOF FFFF
OOOEOOOOto
OOOEFFFF

WPt

Cache
Yest

64KB

Yest

Yes

64KB

Yest

Yes

LAN

32KB

BIOS/RAM
LAN RAM

32KB

Video

32KB

Video BIOS

32KB

Yest

Video RAM

128KB

Base
memory

640KB

Yest

Function

Size

Shadow

Extended
memory
System
BiOSiSCSI
BIOS
System

47MB

BIOS
Setup/EMS

OOOD 8000 to
OOODFFFF
OOOD 0000 to
OOOD7FFF
OOOC 8000 to
OOOCFFFF
OOOCOOOO to
OOOC7FFF
OOOAOOOO to
OOOBFFFF
OOOOOOOOto
0009 FFFF

buffer

t Can also be disabled

t Write protected (not cached in the i486)

DECpc 433 Workstation Service Guide

0-1

Device Mapping

Table D-2. 1/0 Address Map

Range
(in hex)

Function

OOO:OOF
020:03F

OMA controller one

040:043

Programmable interval timer

060:06F

Keyboard (61 port B)

070:07F

Real-time Clock (RTC), NMI

080:09F
OAO:OBF
OCO:ODF

DMA page register

DEC

82340 configuration index register

OED

82340 configuration data register

DEE

FastA20

OEF

Fast reset

OFO

Clear numeric coprocessor busy

OFl

Reset numeric coprocessor

GF8
OF9
OFA
I OFB

Numeric coprocessor

D-2

Interrupt controller one

Interrupt controUer two
DMA controller two

82340 configuration disable
Numeric coprocessor

I 82340 configuration enable

DECpc 433 Workstation Service Guide

Device Mapping

Table D-2. 1/0 Address Map (continued)

Range
(in hex)

Function

OFC:OFF

Reserved for numeric coprocessor

170:171
1F0:1F8
200:20C

Secondary RTC (not used)

2B0:2BF

TIGA graphics video

2F8:2FF

COM2

340:35C

SCSI registers

278:37F

LPTt

3B0:3DF

Video (EGA, VGA, etc.)

3C0:3CF

P...:gisters

3F0:3F7

Floppy disk controller

3F8:3FF

Corona configuration port 1 (COMl)

800

Corona configuration port A (write/read)

804

Corona configuration port B (read only)

808

c~-~·-~ma configuration port

soc

Corona configuration port D (write/read)

46E8

VGA

i-----

IDE controller

LAN registers

DECpc 433 Workstation Service Guidl'!

c (write/read)

D-3

Device Mapping

Table D-3. System Interrupt Levels

Priority

Interrupt
Controller

Interrupt
Number

Interrupt
Source

IRQO

Timer tick

IRQt

Keyboard controller

IRQ2

Cascade interrupt

IRQ8

Real-time Clock (RTC)

IRQ9

Reserved

IRQlO

TIGAvideo

2
2
-~J~
2
2

IRQll

SCSI interrupt

IRQ12

Mouse interrupt

IRQ13

Numeric coprocessor

IRQ14

Hard disk drive

IRQ15

Reserved

IRQ3

COM2

IRQ4

COM!

IRQS

LAN interrupt

IRQ6

Floppy disk drive

IRQ7

LPTl

3
l

d
4

D-4

DECpc 433 Workstation Service Guide

Device Mapping

Table D-4. LAN Memory Map

(Mnemonic
BUF
BUF
ROM

I Function
Dual-port RAM
in64KBmode
Dual-port RAM
in32I<Bmode
Diagnostic~

remote boot

Rj\\rt

nnm
D/

R/W

B/W

Address
DOOOO:DBFFF

R/W

BtvV

D8000:DBFFF

BJW

DCOOO:DFFFF

t Read/write

t Byte/word

DECpc 433 Workstation Service Guide

D-5

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:iooocxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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xxxxxxxxxxxxxxxxxxxxxxxxxxxx~xxxx

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xxxxxxxxxxxxxxxxxxxxxxxxx
xxxxXXX>";xxxxxxxxxxxxxxx
X..'ICXXKY.XXXXXXXXXXXXXXX

xxxxxxxxxxxxxxxxxxx
XXXXXXXXXXXXKXXXX

xxxxxxxxxxxxxxx
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xxxxxxxxx
xxxxxxx
xxxxx
xxx
x

x
Y.XX

xxxxx
xxxxxxx
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Index
2
2. 5-inch drive
removal. 3-13
replacement. 3-16

replacement. 3-6
current requirements
system board, A-2

device mapping, 0-1
disk drive, troubleshooting. 2-18

3. 5-inch drive
removal. 3-16

replacement. 3-20

A
address map

1/0. D-1

error messages, POST, 2-6
external cache
removal, 3-29
replacement, 3-29

LAN memory. 0- 1
memory, 0-1

FRt~s

2 5-inch hard disk drive. 1-3
3 5-inch disk drive, 1-3
battery, 1-5
intelligent graphics controller, 1-3
keyboard, 1-6
monitor, 1-5
mouse, 1-6
power supply, 1-4
SCSI expansion box. 1-5
SIMMs, graphics controller, 1-4
system board, 1-3
sy~tem box. 1-3
workstation. 1-1

battery
removal, 3-23
replacement. 1-24
beep codes
graphics controller. 2-11
system, 2-11

central hardware. POST. 2-3
configuration, system. changing, C-5
connectors
keyboard, 8-4
monitor, 8-5
mouse, B-4
parallel port, B-3
SCSI, 8-6
serial ports, 8-2
system box, B-1
cover
SCSI box
removal. 4-3
replacement. 4-5
system box
removal. 3-4

DECpc 433 Workstation Service Manual

G
graphics controller
removal. 3-25
replacement, 3-27

I
inner cover
removal. 3-9
replacement, 3-11
interrupt levels. 0-4

IN-1

Index

K
keyboard. connector, B-4
keyboard, service procedures. 1-6

system box
removal. 3-31
replacement. 3-32

•

M
SCSI box
mapping. device. D-1
monitor
troubleshooting, 2- 19
monitor. connector. 8-5
monitor. service procedures. 1-5
mouse, service procedures. 1-6
mouse connector. B-4

0
options. setup configuration, C-1

p
parallel port. connector. B-3
password, C-9
peripheral device

SCSI
removal. 4-7. 4-12
replacemert, 4-11. 4- 16
peripheral hardware. POST. 2-4

POST
central hardware. 2-3
countdown numbers. 2-5
description, 2-3
graphic controller, beep code, 2-11
message
error detected, 2-5

errors, 2-6
test complete. 2-5
peripheral hardware. 2-4
system, beep code, 2- ii
test length, 2-5
power supply
SCSI box
removal, 4-1 C
replacement. 4-18

IN-2

cover
removal, 4-3
replacement. 4-5
peripheral device
removal, 4-7, 4-12
replacement, 4-11, 4-16
power requirement, A-1
power supply
removal, 4-16
replacement. 4-18
troubleshooting, 2-20
SCSI. connector, 8-6
serial port, connectors. B-2
setup
changing configurations, C-5
configuration settings, C-1
descriptions, configuration, C-6
running, C-2
system information menu, C-9
setup options
base memory, C-7
cache enable/disable. C-9

•

fast mode, C-7
flnnnv
rii"'lt rlri"'" "',,...."" r- ~
··--r-rr1 - · - · .. - · · ... - .. ,...,...... ...__. .. u

hard disk drive type. C-7
IDE disk. C-7
LAN bont. C-8
I ll.1\1 t:~--·
·• r o
lU I itJ\JUl, ~-(.J

. _ , 111"'

l::inn11;:inp~

._,

.,_,.

r- .F>-

SCS: h<:.id diive. C-8
setting CPU speed. C-7
shadowing, C-9
slow mode, C-7
system date, C-6
system password. C-9
system time. C-6

Dt.Cpc 433 Workstation Service Manual

•

Index

user definable drives. C-8

SIMM
system board, replacement. 3-35
system board.removal. 3-34
system board
current requirements, A-2
external cache. 1-3

replacement, 3-39
troubleshooting, 2-16
system box. FRUs, 1-3
system configurations
changing. C-5
system information menu, C-9

FRUs, 1-3
removal. 3-37
replacement, 3-39

SIMM
removal, 3-34
replacement. 3-35
SIMMs, 1-3
system box
2 5-inch drive
removal, 3-13
replacement. 3- 16
3.5-inch drive
removal. 3-16
replacement. 3-20
battery
removal. 3-23

troubleshooting
disk drives, 2-18
monitor, 2-19
SCSI box. 2-20
system box, 2-16

rep!acementl 3-24
connectors, B-1
cover
removal, 3-4
replacement. 3-6
external cache
removal, 3-29
replacement. 3-29
graphics controller
removal. 3-25
replacement, 3-27
inner cover
removal, 3-9
replacement. 3-11
power requirement. A-1
power supply
removal, 3-31
replacement, 3-32
system board
removal, 3-37

DECpc 433 Workstation Service Manual

IN-3