Digital Equipment DECstation 212LP User manual

DECstation
212LP/316SX/320SX
ServiceGuide
Order Number EK-PC44A-SV-002
Digital Equipment Corporation

Second Edition, October 1990
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 may appear
in this document.
The software 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 on equipment
that is not supplied by Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U. S. Government 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.
Copyright © Digital Equipment Corporation 1990
All Rights Reserved.
Printed in U.S.A.
FCC NOTICE: The equipment described in this manual has been certified to
comply with the limits for a Class B computing device, pursuant to Subpart
J of Part 15 of FCC Rules. Only peripherals (computer input/output devices,
terminals, printers, etcetera) certified to comply with the Class B limits may be
attached to this computer. Operation with noncertified peripherals may result
in interference to radio and television reception. This equipment generates and
uses radio frequency energy and if not installed and used properly, that is, in
strict accordance with the manufacturer’s instructions, may cause interference to
radio and television reception. It has been type tested and found to comply with
the limits for a Class B computing device in accordance with the specifications
in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable
protection against such interference in a residential installation. However, there
is no guarantee that interference will not occur in a particular installation. If
this equipment does cause interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
– Reorient the receiving antenna.
– Move the computer away from the receiver.
– Plug the computer into a different outlet so that computer and receiver are
on different branch circuits.
If necessary, the user should consult the dealer or an experienced radio/television
technician for additional suggestions. The user may find the following booklet
prepared by the Federal Communications Commission helpful: How to Identify
and Resolve Radio-TV Interference Problems. This booklet is available from the
US Government Printing Office, Washington, DC 20402, Stock No. 004–000–
00398–5

The following are trademarks of Digital Equipment Corporation:
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DEC/CMS EduSystem VAX
DEC/MMS IAS VAXcluster
DECnet MASSBUS VMS
DECsystem–10 PDP VT
DECSYSTEM–20 PDT
DECUS RSTS
DECwriter RSX
dt
MS-DOS is a registered trademark of Microsoft Corporation.
Velcro is a trademark of VELCRO USA Inc.
IBM and IBM-PC/AT are registered trademarks of International Business
Machines Corporation.
Intel is a trademark of Intel Corporation.
This document was prepared and published by Educational Services Development
and Publishing, Digital Equipment Corporation.

Contents
About This Guide vii
1 Overview
1.1 Introduction ...................................... 1–1
1.2 DECstation Base System ............................ 1–2
1.3 DECstation Options ................................ 1–3
1.3.1 System Unit Layout .............................. 1–4
1.4 DECstation System Configurations .................... 1–4
1.4.1 DECstation 212LP Main Logic Board . . ............... 1–6
1.4.2 DECstation 316SX Main Logic Board . . ............... 1–6
1.4.3 DECstation 320SX Main Logic Board . . ............... 1–6
1.4.4 Power Supply . . . ................................ 1–7
1.4.5 Monitors....................................... 1–7
1.4.6 Enhanced Keyboards ............................. 1–9
1.4.6.1 101-Key Enhanced Keyboard ..................... 1–9
1.4.6.2 LK250 Keyboard .............................. 1–9
1.4.7 Math Coprocessor................................ 1–10
2 Troubleshooting
2.1 Special Tools ..................................... 2–1
2.2 Diagnostics....................................... 2–2
2.3 Normal Power Up . ................................ 2–3
2.4 Troubleshooting Procedures . . ........................ 2–3
2.4.1 Getting Started . ................................ 2–4
2.4.2 No Power ...................................... 2–5
2.4.3 System Does Not Boot ............................ 2–6
2.4.4 System Boots . . . ................................ 2–6
iii

iv Contents
2.5 Error Codes and Messages . . . ........................ 2–7
2.5.1 Power Up Beep Codes ............................ 2–7
2.5.2 Test Messages . . ................................ 2–11
2.6 Troubleshooting by Symptom . ........................ 2–13
2.6.1 System Unit Problems ............................ 2–13
2.6.2 Disk Related Problems ............................ 2–16
2.6.3 Monitor Problems................................ 2–17
2.7 Troubleshooting Problems Occurring During System
Operation ........................................ 2–20
2.8 Using the System Utilities Diskette .................... 2–21
2.8.1 Running the Setup Program ....................... 2–21
3 FRU Replacement
3.1 Introduction ...................................... 3–1
3.1.1 Before Replacing FRUs . . . ........................ 3–5
3.2 Replacing FRUs . . . ................................ 3–5
3.2.1 Keyboard Replacement............................ 3–8
3.2.2 Monitor Replacement............................. 3–8
3.2.3 Mouse Replacement .............................. 3–8
3.2.4 System Cover Removal............................ 3–9
3.2.5 Opening the System Unit. . ........................ 3–10
3.2.6 Option Board Replacement ........................ 3–12
3.2.7 Option Slot Printed Circuit Board Replacement . ....... 3–13
3.2.8 Speaker Replacement ............................. 3–15
3.2.9 Battery Replacement ............................. 3–15
3.2.10 Reset Button Removal ............................ 3–17
3.2.11 Single-In-Line Memory Module Replacement ........... 3–19
3.2.12 Math Coprocessor Replacement ..................... 3–22
3.2.13 Main Logic Board Replacement ..................... 3–26
3.2.14 Floppy Drive Replacement . ........................ 3–30
3.2.15 Replacing An Optional Floppy Drive . . ............... 3–30
3.2.16 Replacing an Optional Hard Disk or Tape Drive . ....... 3–30
3.2.17 DECstation Power Supply Removal . . . ............... 3–32
3.3 Main Logic Board Jumpers . . ........................ 3–34
3.3.1 212LP Main Logic Board Jumpers ................... 3–34
3.3.2 316SX Main Logic Board Jumpers ................... 3–36

Contents v
3.3.3 DECstation 316SX Main Logic Board Switch Settings .... 3–38
3.3.4 320SX Main Logic Board Jumpers ................... 3–40
3.3.5 DECstation 320SX Main Logic Board Switch Settings .... 3–42
A Power Consumption
B Peripheral Interface
Index
Figures
1–1 DECstation Personal Computer ....................... 1–1
1–2 System Unit Layout ................................ 1–4
3–1 Exploded View of DECstation Chassis . . . ............... 3–6
3–2 Exploded View of DECstation Main Logic Board and Options 3–7
3–3 Removing the DECstation System Cover . ............... 3–9
3–4 Opening the DECstation System Unit . . . ............... 3–11
3–5 Removing the Bus Adapter Board ..................... 3–14
3–6 Removing the DECstation 212LP Battery ............... 3–16
3–7 Removing the DECstation 316SX/ 320SX Battery . . ....... 3–17
3–8 Removing the Reset Button . . ........................ 3–18
3–9 Removing and Replacing the 212LP SIMM .............. 3–20
3–10 Removing and Replacing the 316SX/320SX SIMM . . ....... 3–21
3–11 Replacing the 212LP Math Coprocessor . ............... 3–23
3–12 Replacing the 316SX Math Coprocessor . . ............... 3–24
3–13 320SX Math Coprocessor Replacement . . . ............... 3–25
3–14 Removing the 212LP Main Logic Board . . ............... 3–27
3–15 Removing the 316SX Main Logic Board . . ............... 3–28
3–16 Removing the 320SX Main Logic Board . . ............... 3–29
3–17 Replacing the Floppy Disk Drive ...................... 3–31
3–18 Removing the DECstation Power Supply . ............... 3–33
3–19 212LP Main Logic Board Jumper Locations .............. 3–34
3–20 316SX Main Logic Board Jumper Locations .............. 3–36
3–21 DECstation 316SX Main Logic Board Switch Location ...... 3–38

vi Contents
3–22 320SX Main Logic Board Jumper Locations .............. 3–40
3–23 DECstation 320SX Main Logic Board Switch Location ...... 3–42
Tables
1–1 Base System Configurations. . ........................ 1–5
1–2 Monitors. ........................................ 1–7
1–3 Math Coprocessors . ................................ 1–10
2–1 Troubleshooting Tools ............................... 2–2
2–2 Primary Beep Codes................................ 2–8
2–3 Secondary Beep Codes .............................. 2–9
2–4 BIOS Error Messages............................... 2–11
2–5 System Unit Troubleshooting Procedures . ............... 2–13
2–6 Hard Disk and Diskette Drive Troubleshooting Procedures . . 2–16
2–7 Monitor Troubleshooting Procedures ................... 2–17
3–1 DECstation Standard Field Replaceable Units ........... 3–1
3–2 DECstation Optional Field Replaceable Units ............ 3–2
3–3 212LP Main Logic Board Jumper Settings ............... 3–35
3–4 316SX Main Logic Board Jumper Settings ............... 3–37
3–5 DECstation 316SX Main Logic Board Switch Settings ...... 3–39
3–6 320SX Main Logic Board Jumper Settings ............... 3–41
3–7 DECstation 320SX Main Logic Board Switch Settings ...... 3–43
A–1 DECstation Base System Power Consumption ............ A–1
B–1 Parallel I/O Port Connector . . ........................ B–1
B–2 RS-232C Serial Port Connector ....................... B–2
B–3 Keyboard and Mouse Connectors ...................... B–2
B–4 Video Port Connector ............................... B–3

AboutThisGuide
This service guide is designed to help you diagnose and repair
the DECstation 212LP, DECstation 316SX and DECstation
320SX personal computers. This guide contains information on
servicing the base system only. Specific information on installing,
replacing, and configuring options is covered in the individual
option installation guides supplied with those products and is
available to Customer Service personnel in a kit.
Guide Organization
The guide is organized as follows:
• Chapter 1 provides an overview of the DECstation systems.
• Chapter 2 details troubleshooting instructions.
• Chapter 3 contains procedures for removing and replacing
field replaceable units.
For information about network troubleshooting, refer to the PCSA
Network Troubleshooting Guide. For additional information about
PC architecture and the Digital Ethernet Personal Computer Bus
Adapter (DEPCA) and DEC EtherWORKS option boards, refer to
the appropriate Service Guides.
Intended Audience
The procedures in this guide are for service technicians trained
only by Digital Equipment Corporation.
vii

viii About This Guide
Conventions
This document uses the following conventions:
Convention Meaning
Warning Provides information to prevent
personal injury
Caution Provides information to prevent
damage to equipment
Note Provides general information you
should be aware of
Ctrl Alt Del Press and hold Ctrl while you
press both Alt and Del. Control
key sequences have special
functions.
Strike the F1 key What the screen displays as a
prompt or an instruction is shown
in monospaced type.
Throughout this guide, DECstation refers to the DECstation
212LP, DECstation 316SX, and the DECstation 320SX. When
information applies to a specific DECstation, the full title is used.
The computer industry recognizes two open architectures as
industry standards: the IBM-PC/AT bus structure and the
Microsoft disk operating system, MS-DOS. The term industry-
standard refers to compatibility with these architectures. Support
for MS-DOS requires a defined set of ROM-BIOS (read-only
memory basic I/O system services) which the DECstation offers.
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 1-800-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.

About This Guide ix
Related Documentation
The following related documents are available as supplements to
the information provided in this guide.
Document Part Number
DECstation 212LP User’s Guide ER-PC441-UG
DECstation 316SX User’s Guide ER-PC442-UG
DECstation 320SX User’s Guide ER-PC443-UG
DECstation 212LP Technical Reference
Manual ER-PC44Y-AA
DECstation 316SX Technical Reference
Manual ER-PC44Y-BB
DECstation 320SX Technical Reference
Manual ER-PC44Y-CC
DECstation Option Installation Guides
Service Kit ER-4XOPS-SV
PCSA Network Troubleshooting Guide AA-JU54A-TH
DEC EtherWORKS Service Guide EK-DE21A-SV
DECconnect System Stand-alone
ThinWire Networks Planning and
Installation Guide
EK-DECSY-TG
DECconnect System Planning and
Configuration Guide EK-DECSY-CG
DECconnect System Installation and
Verification Guide EK-DECSY-VG
Digital personnel may order 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 (NRO2-2) Order
Processing Section
On-line orders can be sent ALL-IN-1 mail to Order @NRO or VMS
mail to NEST::ORDER.