DEC DECstation 316SX, DECstation 212LP Service Guide

Page 1
DECstation
LP/316SX/320SX
212 ServiceGuide
Order Number EK-PC44A-SV-002
Digital Equipment Corporation
Page 2
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
Page 3
The following are trademarks of Digital Equipment Corporation: DEC DIBOL UNIBUS
DEC/CMS EduSystem VAX DEC/MMS IAS VAXcluster DECnet MASSBUS VMS DECsystem–10 PDP VT DECSYSTEM–20 PDT DECUS RSTS DECwriter RSX
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.
dt
Page 4
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
Page 5
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
Page 6
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
Page 7
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
Page 8
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
Page 9
viii About This Guide
Conventions
This document uses the following conventions:
Convention Meaning
Warning Provides information to prevent Caution Provides information to prevent Note Provides general information you
Ctrl Alt Del
Strike the F1 key What the screen displays as a
personal injury damage to equipment should be aware of
Alt
Ctrl
and
while you
Del
. Control
Press and hold press both
key sequences have special functions.
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 industry­standard 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.
Page 10
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 316 DECstation 320 DECstation 212
Manual DECstation 316
Manual DECstation 320
Manual DECstation Option Installation Guides
Service Kit PCSA Network Troubleshooting Guide AA-JU54A-TH DEC EtherWORKS Service Guide EK-DE21A-SV DECconnect System Stand-alone
ThinWire Networks Planning and Installation Guide
DECconnect System Planning and Configuration Guide
DECconnect System Installation and Verification Guide
SX User’s Guide ER-PC442-UG SX User’s Guide ER-PC443-UG LP Technical Reference
SX Technical Reference SX Technical Reference
ER-PC44Y-AA ER-PC44Y-BB ER-PC44Y-CC ER-4XOPS-SV
EK-DECSY-TG
EK-DECSY-CG 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.
Page 11
x About This Guide
Digital personnel may order documents with part numbers beginning with AA from:
Digital Equipment Corporation Digital Drive
Westminster MA 01473-0471 Attn: Attention: Order Administration Digital self-maintenance customers may order documents with
part numbers beginning with either EK, ER, or AA by mail or phone from:
Digital Equipment Corporation
Peripherals and Supplies Group
P.O. Box CS2008
Nashua, NH 03061 Or, by phone, between 8:30am and 8:00pm Eastern Standard
Time, call:
1-800-DIGITAL
Page 12
1
Overview
1.1 Introduction
The DECstation (Figure 1–1) is a desktop computer. It can be used as a standalone personal computer or as a node on a network to a VAX computer or another DECstation with network server software. The DECstation runs Digital and other industry­standard applications.
LJ-1713
Figure 1–1 DECstation Personal Computer
1–1
Page 13
1–2 Overview
As a node on a Personal Computing System Architecture (PCSA) network, the DECstation is the user’s interface with the applications and services that the PCSA family of products provides. As part of a network, the DECstation communicates with other computers on the network and shares the various resources and services offered by Digital computers and servers.
1.2 DECstation Base System
The DECstation base system unit consists of the following:
Main logic board containing:
— 12 MHz Intel 80286 processor (DECstation 212LP only) — 16 MHz Intel 80386SX processor (DECstation 316SX only) — 20 MHz Intel 80386SX processor (DECstation 320SX only) — Socket for optional Intel 80287 (DECstation 212LP only) or
Intel 80387SX (DECstation 316SX only) math coprocessor — Socket for optional 386SX math coprocessor — 1 (minimum) to 4 (maximum) Mbytes of SIMM RAM
memory — Serial and parallel ports — PS/2 compatible mouse port — Intelligent Drive Electronics (IDE) drive connector — 16-bit VGA (Video Graphics Array) controller on the main
logic board. — Three 16-bit (also usable as 8-bit) expansion slots for
industry standard options
100 watt power supply with auxiliary power output (IEC) connector
3.5 inch 1.44 Mbyte diskette drive
Page 14
Overview 1–3
1.3 DECstation Options
The following are options available for the DECstation base system:
Color or monochrome VGA analog monitor
40, 80, 170, or 320 Mbyte SCSI hard disk drive
150 Mbyte SCSI Tape cartridge system
20, 40, 120, or 105 Mbyte IDE hard disk drive
60 Mbyte streaming tape drive (QIC-40)
8514/A-Compatible Graphics Adapter
3.5 inch 1.44 Mbyte diskette drive
5.25 inch 1.2 Mbyte diskette drive
5.25 inch 360 Kbyte diskette drive
101-key enhanced keyboard (country-specific)
PS/2 compatible mouse
Power cord (country-specific)
16-bit SCSI host adapter
Serial/parallel adapter
1200/300 internal baud modem
2400 internal baud modem
10 MHz Intel 80287 math coprocessor (DECstation 212LP)
16 MHz Intel 80387SX math coprocessor (DECstation 316SX)
20 MHz Intel 80387SX math coprocessor (DECstation 320SX)
DEC EtherWORKS bus adapter
NOTE
Options listed were available at the time of printing. Additional options may be available at this time.
Page 15
1–4 Overview
1.3.1 System Unit Layout
Figure 1–2 shows the location of both standard and optional equipment within the system unit. Standard equipment (the equipment that is included in the base system) is represented by solid lines. Optional equipment is represented by dotted lines.
LJ-1712
Figure 1–2 System Unit Layout
1.4 DECstation System Configurations
The DECstation personal computers are each available in two base system configurations (115 or 230 Vac). These systems are available for customers who elect to purchase DECstation supported options separately and configure their own systems.
Page 16
Overview 1–5
Additionally, customers can order one of several packaged systems which offer optional system memory configurations, mass storage devices and video adapters installed at the factory. The base system configurations are listed in Table 1–1. The packaged systems are listed in Table 1–2.
Table 1–1 Base System Configurations
Model Number Description
PC441-AA DECstation 212LP; 80286/12 MHz base system box, 1
PC441-A2 Same as PC441-AA, but with no power cord and
PC441-A3 Same as PC441-A2, but with no power cord and
PC442-A2 DECstation 316
PC442-A3 Same as PC442-A2, but with the power supply factory
PC443-A2 DECstation 320
Mbyte (minimum) SIMM RAM, 3.5 inch 1.44 Mbyte floppy diskette drive, on-board IDE device interface, serial/parallel port, mouse and keyboard port, on-board VGA, 3 PC/AT expansion slots (full size), 2 additional front panel storage bays (3.5 and 5.25 inch), with the power supply factory set at 120 Vac, 60 Hz.
keyboard.
keyboard, and is factory set at 240 Vac, 50 Hz.
SX; 80386/16 MHz base system box, 1
Mbyte (minimum) SIMM RAM, 3.5 inch 1.44 Mbyte floppy diskette drive, on-board IDE device interface, serial/parallel port, mouse and keyboard port, 3 PC/AT expansion slots (full size), 2 additional front panel storage bays (3.5 and 5.25 inch), with the power supply factory set at 120 Vac, 60 Hz. No power cord or keyboard.
set at 240 Vac, 50 Hz.
SX; 80386/16 MHz base system box, 1
Mbyte (minimum) SIMM RAM, 3.5 inch 1.44 Mbyte floppy diskette drive, on-board IDE device interface, serial/parallel port, mouse and keyboard port, on-board SVGA, 3 PC/AT expansion slots (full size), 2 additional front panel storage bays (3.5 and 5.25 inch), with the power supply factory set at 120 Vac, 60 Hz. No power cord or keyboard.
Page 17
1–6 Overview
Table 1–1 (Cont.) Base System Configurations
Model Number Description
PC443-A3 Same as PC443-A2, but with the power supply factory
set at 240 Vac, 50 Hz.
1.4.1 DECstation 212LP Main Logic Board
The DECstation 212LP main logic board contains a 12 MHz Intel 80286 CPU microprocessor, a socket for an optional Intel 80287 math coprocessor, floppy disk drive controller, serial and parallel ports, PS/2 compatible mouse port, IDE drive connector, 16-bit VGA controller (800 x 600), four SIMM memory expansion slots, and one bus expansion adapter connector. The bus expansion adapter plugs into the main logic board and contains three 16-bit (also usable as 8-bit) expansion slots.
1.4.2 DECstation 316SX Main Logic Board
The DECstation 316SX main logic board contains a 16 MHz Intel 80386 CPU microprocessor, a socket for an optional Intel 80387SX math coprocessor, floppy disk drives controller, serial and parallel ports, PS/2 compatible mouse port, IDE drive connector, 16-bit VGA controller (800 x 600), four SIMM memory expansion slots, and one bus expansion adapter connector. The bus expansion adapter plugs into the main logic board and contains three 16-bit (also usable as 8-bit) expansion slots.
1.4.3 DECstation 320SX Main Logic Board
The DECstation 320SX main logic board contains a 20 MHz Intel 80386 CPU microprocessor, a socket for an optional Intel 80387SX math coprocessor, floppy disk drives controller, serial and parallel ports, PS/2 compatible mouse port, IDE drive connector, Super VGA controller (1024 x 768) with 512 Kbytes, 1 Mbyte system RAM (fixed) with four SIMM video memory expansion slots, and one bus expansion adapter connector. The bus expansion adapter plugs into the main logic board and contains three 16-bit (also usable as 8-bit) expansion slots.
Page 18
Overview 1–7
1.4.4 Power Supply
The DECstation is supplied with a 100 watt power supply that includes an auxiliary ac power output (IEC) connector. The power supply is switch selectable between either 115 Vac, 60 Hz or 230 Vac, 50/60 Hz power input.
1.4.5 Monitors
The DECstation supports both color and monochrome VGA analog monitors. The monitors are available in different voltage input variations and video alignments to meet international requirements. See Table 2–7.
Table 1–2 Monitors
Model Number Part Number Description
PC4XV-AA 30-32317-01 VGA monochromatic 14" for all
PC4XV-A2 30-32317-01 VGA monochromatic 14"
PC4XV-A3 30-32319-01 VGA monochromatic 14"
PC4XV-A4 30-32320-01 VGA monochromatic 14"
versions of DECstation personal computers. Requires PC4XG-AA or -AB VGA adapter, except on the PC44- models. Displays 64 shades of grey, 640 x 480 resolution. 120 Vac 60 Hz (US and Canada)
international version, 120 Vac 60 Hz, with 640 x 480 resolution, North Hemisphere (IEC plug)
international version, 240 Vac 50 Hz, with 640 x 480 resolution, North Hemisphere (IEC plug)
international version, 240 Vac 50 Hz, with 640 x 480 resolution, South Hemisphere (IEC plug)
Page 19
1–8 Overview
Table 1–2 (Cont.) Monitors
Model Number Part Number Description
PC4XV-A5 30-32318-01 VGA monochromatic 14"
PC4XV-A6 30-33966-01 VGA monochromatic RGB 14"
PC4XV-A7 30-33967-01 VGA monochromatic RGB 14"
PC4XV-BA 30-30901-01 VGA color RGB 14" for all versions
PC4XV-B2 30-32313-01 VGA color RGB 14" international
PC4XV-B3 30-32315-01 VGA color RGB 14" international
PC4XV-B4 30-32316-01 VGA color RGB 14" international
PC4XV-B5 30-32314-01 VGA color RGB 14" international
international version, 120 Vac 60 Hz, with 640 x 480 resolution, South Hemisphere (IEC plug)
international version, 240 Vac 50 Hz, with 640 x 480 resolution, North Hemisphere (IEC plug)
international version, 240 Vac 50 Hz, with 640 x 480 resolution, South Hemisphere (IEC plug)
of DECstation personal computers. Requires PC4XG-AA or -AB VGA adapter, except on the PC44­models. Displays at 640 x 480 colors. 120 Vac 60 Hz (US and Canada)
version, 120 Vac 60 Hz, with 1024 x 768 resolution, North Hemisphere (IEC plug)
version, 240 Vac 50 Hz, with 640 x 480 resolution, North Hemisphere (IEC plug)
version, 240 Vac 50 Hz, with 640 x 480 resolution, South Hemisphere (IEC plug)
version, 120 Vac 60 Hz, with 1024 x 768 resolution, South Hemisphere (IEC plug)
Page 20
Table 1–2 (Cont.) Monitors
Model Number Part Number Description
Overview 1–9
PC4XV-B6 30-33968-01 SVGA color RGB 14" international
PC4XV-B7 30-33969-01 SVGA color RGB 14" international
version, 240 Vac 50 Hz, with 1024 x 768 resolution, North Hemisphere (IEC plug)
version, 240 Vac 50 Hz, with 1024 x 768 resolution, South Hemisphere (IEC plug)
1.4.6 Enhanced Keyboards
There are two different keyboards available as options on the DECstation: The 101-key enhanced keyboard and the LK250 keyboard.
NOTE
Keyboards used with the DECstation 212LP, DECstation 316SX, and DECstation 320SX must be equipped with a 6-pin miniature PS/2 compatible connector.
1.4.6.1 101-Key Enhanced Keyboard
The 101-key enhanced keyboard provides the industry-standard IBM-PC/AT-style key arrangement on a smaller, desktop keyboard.
1.4.6.2 LK250 Keyboard
The LK250 keyboard provides the standard Digital key arrangement available in several country-specific language variations.
Page 21
1–10 Overview
1.4.7 Math Coprocessor
The math coprocessors listed in Table 1–3 plug into the main logic board and allow each DECstation to process numeric data faster.
Table 1–3 Math Coprocessors
Model Number Description
PC44P-AA 10 MHz optional Intel 80287 coprocessor for the
DECstation 212
LP
PC46P-BB 16 MHz optional Intel 80387 coprocessor for the
DECstation 316
SX
PC44P-CC 16 MHz optional Intel 80387sx coprocessor for the
DECstation 320
SX
Page 22
Troubleshooting
This chapter provides troubleshooting instructions for the DECstation systems. It is divided into the following sections:
Special tools
Diagnostics
Normal power up
Troubleshooting procedures
Error codes and how to use them
Troubleshooting by symptom
Troubleshooting during system operation
Using the System Utilities diskette
For information about jumper settings, troubleshooting, and servicing of the DEC EtherWORKS option board and related network connections refer to the DEC EtherWORKS Service Guide.
2
2.1 Special Tools
The special tools needed to troubleshoot the DECstation system are given in Table 2–1.
2–1
Page 23
2–2 Troubleshooting
Table 2–1 Troubleshooting Tools
Tool Part Number Definition
Diagnose
Diagnostics
Tri-wrap Loopback Connector
DECstation
LP Utilities
212 Diskette
DECstation
SX Utilities
316 Diskette
DECstation
SX Utilities
320 Diskette
29-27462-01 These standalone diagnostics
are available separately. For information about using these diagnostics, refer to the accompanying manual.
FD-10164-00 This triple connector consists
of a male 25-pin parallel loopback connector, a female 25-pin serial loopback connector, and a female 9­pin serial loopback connector bundled together and housed in a streamlined package.
29-28243-01 Use to reconfigure the CPU
when options are installed.
29-28111-01 Use to reconfigure the CPU
when options are installed.
29-28854-01 Use to reconfigure the CPU
when options are installed.
2.2 Diagnostics
The DECstation has internal ROM-based diagnostics to aid in troubleshooting. These diagnostics are run at system power-up and verify the operation of the machine. Error messages are given in two formats: beep codes and message displays on the screen. These error messages are explained in Section 2.5.
Page 24
Troubleshooting 2–3
2.3 Normal Power Up
In a normal system power up the following takes place.
1. Power to the monitor and system unit is turned on. Both power indicators are on.
2. The system executes its power-up tests, displays the BIOS ROM version, assorted copyright information, and the memory size. Depending on the option(s) installed in the system additional information may be displayed.
If there is an error during any of the power-up tests the system either generates a beep error code or displays an error message.
3. The system generates a single beep, displays information about the operating system, and gives the date prompt. Note that the actual information displayed at this time depends on the system software.
2.4 Troubleshooting Procedures
This section describes three troubleshooting procedures that can be used depending on the state of the system. Each procedure will get the system to a state where it can run the Diagnose diagnostic package. Perform the steps in Section 2.4.1 and then go to the recommended procedure.
CAUTION
Before troubleshooting the DECstation, it must be disconnected from any network.
Page 25
2–4 Troubleshooting
2.4.1 Getting Started
The following steps prepare you for troubleshooting a DECstation.
1. Ask the customer to describe the problem. You need to find out:
— When the problem started — If any new hardware options were added to the system
around the time the problem started and if the options are Digital certified or third party
— If any new software was added to the system
2. Have the customer supply you with a copy of the operating system diskette(s) that came with the system.
3. Have the customer provide you with the system configuration.
— Type of monitor — Type of keyboard — Type and number of disk drives — Type and amount of memory — Type of network adapter — Type of mouse — Type of disk adapter (if on-board disk adapter is disabled) — Type of video graphics adapter (if on-board VGA is
disabled)
— Any other options installed in the system
4. Observe the problem. Based on what you observe refer to one of the following procedures:
— If the system does not power up see Section 2.4.2, No
Power.
— If the system powers up but will not boot see Section 2.4.3,
System Does Not Boot.
Page 26
Troubleshooting 2–5
— If the system powers up and boots see Section 2.4.4,
System Boots.
2.4.2 No Power
This procedure is to help determine the cause of the problem when the DECstation does not power up. Before starting this procedure be sure you have done the steps in Section 2.4.1.
1. Check the system for loose cables and connections.
2. Check the 115/230 Vac switch on the back of the system unit.
3. Plug the system unit and monitor power cord into a working ac outlet.
4. Turn on power to the monitor and system unit. Check for system power. The following are indications that the system and monitor have powered up:
— Power indicators on the system unit and monitor are on. — You can hear the fan running. — You can hear the hard disk spinning.
5. If the system does not power up: a. Turn off power to the system unit and monitor. b. Unplug the system and monitor from the ac outlet. c. Disconnect power to all the hard disk drives and remove
all options. d. Plug the monitor and system into a working ac outlet. e. Turn the monitor and system power on. If the system
powers up there was either a faulty device, too many
options installed, or another power related problem. f. Try booting the system from the operating system startup
diskette. g. Replace the Digital certified options one at a time and see
if the system powers up each time an option is replaced or
a disk drive is reconnected.
Page 27
2–6 Troubleshooting
6. If the system powers up and does not boot refer to Section 2.4.3.
7. If the system powers up and boots refer to Section 2.4.4.
2.4.3 System Does Not Boot
This procedure is to help determine why the DECstation does not boot. Before starting this procedure be sure you have done the steps in Section 2.4.1.
1. Remove any third party options and try to reboot the system. If the system generates any beep codes refer to Section 2.5.1, Power Up Beep Codes.
2. Try booting from the operating system startup diskette. a. If the system does not boot verify that all jumpers are set
correctly. Reboot the system after verifying the jumper settings.
b. Lack of beep codes and video indicate a possible bad main
logic board.
c. If the system still does not boot remove all options and try
to boot the system.
d. Replace the Digital certified options one at a time and see
if the system powers up and boots each time an option is replaced or a disk drive is reconnected.
3. When the system boots refer to Section 2.4.4.
2.4.4 System Boots
The DECstation can have a problem but still boot on power­up. This procedure is to help determine the problem with a DECstation that boots but still emits error beep codes or displays an error message. Before starting this procedure be sure you have done the steps in Section 2.4.1.
CAUTION
The system must be disconnected from any network before running the Diagnose diagnostics.
Page 28
Troubleshooting 2–7
1. Determine what the failure is. Refer to Section 2.5 for a list of possible error messages. If there are no error messages refer to Section 2.6 for a list of symptoms and possible causes.
2. Run the Diagnose diagnostics.
3. Replace the necessary FRU.
2.5 Error Codes and Messages
During the power-up sequence, the DECstation executes built-in diagnostic and bootstrap routines. During the first portion of power up testing, the system generates beep codes on the speaker if the test program detects a fatal error. The system uses the beep codes to report test results only until screen initialization and screen retrace verification have occurred. After screen initialization and verification the built-in diagnostic sends non­fatal error messages to video memory and the system displays the messages on the monitor.
CAUTION
Do not connect or disconnect the video cable from the monitor or system when the monitor and/or system is on. This can cause damage to the system. Always turn the monitor and system off, then wait 20 seconds and disconnect the power cord before you remove the system unit cover. Observe anti-static precautions.
2.5.1 Power Up Beep Codes
During the power up self test, the system generates two levels of beep codes. The primary level consists of a combination of long and short beeps which indicate possible system malfunction conditions. The secondary level utilizes bursts of beeps in a numeric beep code pattern to indicate specific malfunction locations on the main logic board.
Table 2–2 lists the primary beep codes. The primary beep codes indicate a main logic board failure, memory failure, memory configuration error, or a video error. If a memory failure is indicated, check and reseat the single-in-line memory modules (SIMMs) on the 0K Memory Adapter. If you suspect a bad SIMM, first replace one SIMM and then the other.
Page 29
2–8 Troubleshooting
Table 2–2 Primary Beep Codes
Possible
Beep Code
Problem Corrective Action
Two short beeps
Long-short­long-short beep
Several bursts of
1
beeps
Keyboard failure
Hard disk failure
Be sure the keyboard cable is firmly connected.
Be sure the drive cables are firmly connected and all drive and adapter jumpers are set correctly.
Diskette drive failure
Be sure drive cables are firmly connected and the drive switch is set correctly.
Tape drive failure
Be sure the drive cables are firmly connected and all drive and host adapter jumpers are set correctly.
Invalid configuration
Configuration record bad
Check the information entered with the Setup utility.
Check the information entered with the Setup utility. See the hard disk installation guide for configuration information. Check the CMOS battery connection.
Clock chip lost power
Turn the computer off, wait 20 seconds and then turn it on again. Check the CMOS battery connection.
Video failure Be sure the VGA jumper setting is
enabled on the main logic board.
BIOS ROM, CMOS, DMA, RAM, interrupt, or
Check cable connections and jumper and switch settings. If the problem persists, there might be a problem
on the main logic board. read/write errors
1
If the system generates bursts of beeps, refer to Table 2–3 for a list of specific
failure locations corresponding to the particular numeric beep code pattern.
Page 30
Troubleshooting 2–9
When several bursts of beeps are generated, listen carefully and remember the numeric beep code pattern. This pattern establishes the secondary level of beep codes. Table 2–3 lists the secondary beep codes and the test in-progress or test failure that corresponds to the numeric beep code pattern. For example, "2-1-4" (a burst of two beeps, a single beep, and a burst of four beeps) indicates that a failure of bit 3 in the first 64K of RAM has been detected.
Table 2–3 Secondary Beep Codes
Beep Code Description of Test or Failure
1-1-3 CMOS write/read test in-progress or failure 1-1-4 BIOS ROM checksum test in-progress or failure 1-2-1 Programmable Interval Timer test in-progress or
1-2-2 DMA initialization test in-progress or failure 1-2-3 DMA page register write/read test failure 1-3-1 RAM refresh verification test in-progress or failure 1-3-3 1st 64K RAM chip of data line failure - multi-bit
failure
1
1-3-4 1st 64K RAM odd/even logic failure 1-4-1 1st 64K RAM address line failure 1-4-2 1st 64K parity test in-progress or failure 2-1-1 1st 64K RAM chip or data line failure - bit 0 2-1-2 1st 64K RAM chip or data line failure - bit 1 2-1-3 1st 64K RAM chip or data line failure - bit 2 2-1-4 1st 64K RAM chip or data line failure - bit 4 2-2-1 1st 64K RAM chip or data line failure - bit 4 2-2-2 1st 64K RAM chip or data line failure - bit 5 2-2-3 1st 64K RAM chip or data line failure - bit 6
1
Any of the RAM failures can be caused by a SIMM not being properly seated in
its socket.
Page 31
2–10 Troubleshooting
Table 2–3 (Cont.) Secondary Beep Codes
Beep Code Description of Test or Failure
2-2-4 1st 64K RAM chip or data line failure - bit 7 2-3-1 1st 64K RAM chip or data line failure - bit 8 2-3-2 1st 64K RAM chip or data line failure - bit 9 2-3-3 1st 64K RAM chip or data line failure - bit A 2-3-4 1st 64K RAM chip or data line failure - bit B
2-4-1 1st 64K RAM chip or data line failure - bit C 2-4-2 1st 64K RAM chip or data line failure - bit D 2-4-3 1st 64K RAM chip or data line failure - bit E 2-4-4 1st 64K RAM chip or data line failure - bit F 3-1-1 Slave DMA register test in-progress or failure 3-1-2 Master DMA register test in-progress or failure
3-1-3 Master interrupt mask register test in-progress or
failure
3-1-4 Slave interrupt mask register test in-progress or failure 3-2-4 Keyboard controller test in-progress or failure 3-3-4 Screen memory test in-progress or failure
2
3-4-1 Screen initialization test in-progress or failure 3-4-2 Screen retraces tests in-progress or failure
2
Test failures from this point on can usually be attributed to the VGA adapter or
the slot connector. Try moving the adapter to a different slot.
Page 32
Troubleshooting 2–11
2.5.2 Test Messages
After screen initialization and verification, the built-in diagnostics send non-fatal error messages to video memory and the system displays the messages on the monitor. Table 2–4 lists the BIOS error numbers and the corresponding error messages that displays on the screen.
Table 2–4 BIOS Error Messages
Error Number Error Message
01 Gate A20 failure 02 Unexpected interrupt in protected mode 03 Unexpected SW interrupt at xxxx:xxxx
04 Memory tests terminated by keystroke 05 Memory yyyyy failure at xxxx read xxxx expecting xxxx 06 Display adapter failed; using alternate 07 No timer tick interrupt 08 Shutdown failure 09 Timer chip counter 2 failed 10 Keyboard xxxxx failure 11 Diskette subsystem reset failed 12 Diskette drive 0 seek failure 13 Diskette drive 1 seek failure 14 Hard disk configuration error 15 Hard disk controller failure 16 Hard disk failure 17 Time-of-day clock stopped 18 Invalid configuration information - please run SETUP
Type (S)hut off NMI, (R)eboot, other keys to continue
program
Page 33
2–12 Troubleshooting
Table 2–4 (Cont.) BIOS Error Messages
Error Number Error Message
19 Time-of-day not set - please run SETUP program 20 Keyboard is locked - please unlock 21 Optional ROM bad checksum = xx 22 Strike the F1 key to continue 23 Diskette read failure ­24 Not a boot diskette ­25 No boot device available ­26 Hard disk read failure ­27 No boot sector on hard disk ­28 Insert system diskette and Strike the F1 key to retry
29 I/O card parity interrupt at xxxx:xxxx Type (S)hut off
30 Memory parity interrupt at xxxx:xxxx Type (S)hut off
31 Unexpected type 02 interrupt at xxxx Type (S)hut off
32 Enter Password: 33 Password is incorrect 34 Password OK 35 Password has been removed 36 New password has been installed 37 System halted! Must power down.
boot
NMI, (R)eboot, other keys to continue
NMI, (R)eboot, other keys to continue
NMI, (R)eboot, other keys to continue
Page 34
Troubleshooting 2–13
2.6 Troubleshooting by Symptom
This section describes causes and corrective actions for minor system problems that you can fix. The troubleshooting procedures are separated into system unit, hard disk and diskette drives, monitor, and pointing device problems.
2.6.1 System Unit Problems
Table 2–5 lists some common problems with the system unit, possible causes, and suggested corrective actions. If the corrective action does not work and it is possible to run the Diagnose diagnostics, use them to further isolate the problem and then replace the failing FRU.
Table 2–5 System Unit Troubleshooting Procedures
Problem Possible Cause Corrective Action
No response when the system is turned on.
Power is on, but there is no monitor display.
System is not plugged in.
No power at wall outlet.
Voltage select switch incorrectly set.
Brightness and contrast controls are not set properly.
Monitor is off. Turn on the monitor. Monitor cable
incorrectly installed.
Turn the system off. Plug in the system, then turn the system on again.
Use a working wall outlet.
Make sure the 115/230 Vac voltage select switch is set correctly.
Adjust brightness and contrast controls.
Make sure the monitor cable is installed properly.
Page 35
2–14 Troubleshooting
Table 2–5 (Cont.) System Unit Troubleshooting Procedures
Problem Possible Cause Corrective Action
An Ethernet network adapter is installed but the node does not boot when you try to reboot after using the utilities diskette.
System does not boot from the hard disk.
Tape does not work in the tape drive.
Main logic board failure.
Using a diskette generated reset is not compatible with the Ethernet board.
There is no software on the partition.
System software is not on the hard disk.
Requested partition does not exist or is not formatted.
Primary and secondary drives are set incorrectly.
Hard disk is not installed properly.
Tape is not fully inserted into the tape drive.
Tape is worn or damaged.
Make sure the VGA jumper is enabled on the main logic board. If so, replace the main logic board.
Ctrl Alt Del
Press the same time (a soft reset) to properly reset the hardware, then turn system power off and then on.
Install software on the partition.
Load the system software on the hard disk.
Check the partition. Format the partition; re-partition if necessary.
Make sure the drive jumpers are correctly set.
Check hard disk installation.
Make sure the tape is fully inserted and the cartridge release handle is locked down.
Try another tape.
at
Page 36
Troubleshooting 2–15
Table 2–5 (Cont.) System Unit Troubleshooting Procedures
Problem Possible Cause Corrective Action
System does not boot from the diskette drive.
System does not reboot when the power is turned off and on.
Diskette is not in the diskette drive.
Drive switch is set incorrectly.
Diskette is not bootable.
Diskette is worn or damaged.
Hardware conflict (remote boot).
Power was not off long enough.
Insert a diskette containing bootable system software.
Make sure the drive switch is set correctly.
Use a diskette containing bootable system software.
Try another diskette.
Make sure system is not set for remote boot.
Turn the power off for at least 20 seconds before rebooting.
Page 37
2–16 Troubleshooting
2.6.2 Disk Related Problems
Table 2–6 lists some common disk related problems, possible causes, and suggested corrective actions. If the corrective action does not work, run the Diagnose diagnostics to further isolate the problem and then replace the failing FRU.
Table 2–6 Hard Disk and Diskette Drive Troubleshooting
Procedures
Problem Possible Cause Corrective Action
Hard disk cannot read or write information.
Intermittent hard disk read/write problems.
Hard disk works but produces extra characters or garbled text.
System won’t start from the diskette drive or displays the message Abort, Retry, Ignore.
Diskette drive cannot read or write information.
Problem exists with the drive or drive adapter.
Possible corrupted files.
Hard disk is affected by static electricity.
The diskette has been demagnetized.
Improperly formatted diskette.
The diskette drive is empty.
Diskette is not formatted.
Make sure all jumpers are set correctly.
Restore disk from back-up files.
Move system away from any motors, magnetic devices, or photocopiers.
Increase the humidity in the room and use anti­static mats around the system.
Make sure the disk drive cable is correctly installed. Replace the diskette.
Reformat the diskette.
Insert a diskette into the diskette drive.
Use a preformatted diskette.
Page 38
Troubleshooting 2–17
Table 2–6 (Cont.) Hard Disk and Diskette Drive Troubleshooting
Procedures
Problem Possible Cause Corrective Action
Diskette is worn or damaged.
Try another diskette.
2.6.3 Monitor Problems
Table 2–7 lists some common monitor problems, possible causes, and suggested corrective actions. If the corrective action does not work and it is possible to run the Diagnose diagnostics, use them to further isolate the problem and then replace the failing FRU.
Table 2–7 Monitor Troubleshooting Procedures
Problem Possible Cause Corrective Action
Monitor green LED is not on.
There is no light at the F1 key when you start the system.
Screen is blank and monitor LED is on.
Monitor is not turned on.
Power cord is not connected.
No power at wall outlet.
Setup utility was not run.
Contrast and brightness controls set to minimum.
Turn on the monitor and then the system.
Make sure the power cord is connected to the wall outlet.
Use another outlet.
Run the Setup utility. Use your monitor and adapter board manuals and utilities diskette(s).
Adjust the contrast and brightness controls.
Page 39
2–18 Troubleshooting
Table 2–7 (Cont.) Monitor Troubleshooting Procedures
Problem Possible Cause Corrective Action
Screen goes blank after successful power up; monitor LED is off.
Monitor LED is off, but display is OK.
Monitor is on, but no cursor or text displays.
Main logic board failure.
Power or monitor failure.
Faulty LED. Replace the monitor.
System is not on. Turn on the system.
Contrast control is set to minimum.
Main logic board failure.
Replace the monitor. If that doesn’t fix the problem make sure the VGA jumper is enabled on the main logic board. If it is enabled, replace the main logic board.
Turn the monitor and system off. Disconnect the monitor from the system and wall. Plug the monitor into an working wall outlet. If the monitor LED does not turn on, there is a problem with the monitor or monitor LED.
Turn up the contrast control.
Replace the monitor. If that doesn’t fix the problem make sure the VGA jumper is enabled on the main logic board. If it is enabled, replace the main logic board.
Page 40
Troubleshooting 2–19
Table 2–7 (Cont.) Monitor Troubleshooting Procedures
Problem Possible Cause Corrective Action
Screen display distorted, rolling, flickering, or wrong or uneven color.
Screen displays distorted images or goes blank when you run the software.
Screen displays partially highlighted characters.
You have a color monitor and the display is monochrome.
Monitor cable connector pins bent or broken.
Electromagnetic interference exists.
Software is not configured for, or is incompatible with, the current settings of the VGA board.
Main logic board VGA board jumpers incorrectly set.
System was turned on before turning on the monitor.
Straighten pins or replace the monitor.
Move any electromechanical device away from the monitor or move the monitor.
Reconfigure the software for VGA or set the VGA jumper on the main logic board to a standard supported by your software. See Section 3.3.1 and Section 3.3.2 of this manual or the software manual.
Make sure the VGA jumper is enabled on the main logic board. If so, replace the main logic board. If that doesn’t fix the problem replace the monitor.
Turn off the monitor and system. Wait at least 20 seconds. Turn on the monitor, then the system unit.
Page 41
2–20 Troubleshooting
2.7 Troubleshooting Problems Occurring During System Operation
Sometimes problems occur during system operation. Use the following list to help isolate a problem to a specific subsystem by determining how or when the problem occurs.
The problem occurs during diskette drive access.
Check the diskette drive and the jumper setting.
Look for slightly loose cables.
Check the main logic board jumper settings.
If possible, run the diagnostics. The problem may be with the
main logic board decoding, resistor pack, or faulty loading on the data bus.
See also Section 2.6.
The problem occurs during hard disk drive access.
Check the hard disk drive, including jumper and switch
settings.
Check for loose drive cables.
Check the SCSI board. Make sure it is seated properly and its
jumpers are set correctly.
The problem seems to be video related.
Check the main logic board VGA jumper setting.
The problem seems to be keyboard related.
Keyboard lock may be partially engaged.
Check the keyboard connection.
Run the Diagnose diagnostics. The problem may be the
keyboard interface on the main logic board.
The problem is reproducible or intermittent.
Expansion options may be competing for interrupt request
lines, I/O address range, or memory address range.
Page 42
Troubleshooting 2–21
The problem seems to be heat related.
Make sure there is sufficient air flow around the system.
The system unit may be clogged with dust.
2.8 Using the System Utilities Diskette
The menu driven System Utilities diskette (shipped with the system and required as a Customer Service tool) must be used when options are added to the system. A language option menu displays first when the System Utilities diskette is booted. After a language is selected, an option menu displays. Selecting Setup from the option menu displays the Setup utility menu. The Setup utility must be run anytime the following occur:
The amount of memory in the system is changed.
Diskette drives are added or removed.
A different video display board is installed in the system.
The battery-backed-up date and time are changed.
The CMOS battery is disconnected or changed.
NOTE
MS-DOS and OS/2 users should use the format command present in their operating system. Do not use the format command provided on the System Utilities diskette.
2.8.1 Running the Setup Program
NOTE
If you have installed a new SCSI hard disk drive, format the drive before you run the Setup utility. See your SCSI hard disk installation guide.
You need the following information when you run the Setup utility:
The type of diskette drive for drive A and optional drive B.
System base memory size (displayed on the screen at power-
up).
Page 43
2–22 Troubleshooting
Expansion memory size (displayed on the screen at power-up).
Primary video adapter type (VGA).
CPU and BUS clock speeds.
CPU speed is the CPU processing speed, and BUS speed is the I/O expansion bus transmission speed.
The Setup utility is run as follows:
1. Turn power to the monitor on.
2. Insert the Utilities diskette in the drive and turn power to the
system on.
3. The power-up tests run, then the monitor displays a language
selection menu. Select a language, then press
Enter
.
4. The monitor displays an option menu. Select option 4
(SETUP), then press
Enter
.
5. The monitor displays the Setup utility menu. Follow the
instructions on the bottom of the screen and select the correct system configuration, then pressF2to save and exit the menu.
NOTE
Use the keyboard arrow keys to select a configuration in the Setup utility menu; do not use the keypad arrow keys.
6. Reboot the system using one of the following methods.
Press the
Ctrl Alt Del
keys simultaneously (preferred
method).
Press the Reset button on the front of the system unit. When the system displays the copyright page the setup procedure is complete.
NOTE
If the hard disk is not formatted, a hard disk failure message might display on the copyright screen.
Page 44
3
FRUReplacement
3.1 Introduction
This chapter contains procedures for removing and replacing each DECstation field replaceable unit (FRU). To install many of the FRUs, perform the reverse of the procedure when so noted. Only qualified service technicians should remove and replace FRUs. Use only Digital supplied spares.
Table 3–1 lists standard FRUs and their part numbers for the DECstation systems. Table 3–2 lists optional FRUs and their part numbers.
Table 3–1 DECstation Standard Field Replaceable Units
Digital Part
FRU
Number
DECstation 212LP main logic board with 1 Mbyte memory
DECstation 316 memory
DECstation 320SX main logic board with 1 Mbyte memory (fixed)
100W power supply with fan and IEC assembly 29-28113-01 Rear bezel with IEC 29-28114-01 Card guide 29-28115-01 Speaker with cable assembly 29-28138-01
SX main logic board with 0 Kbyte
29-28137-01
29-28112-01
29-28679-01
3–1
Page 45
3–2 FRU Replacement
Table 3–1 (Cont.) DECstation Standard Field Replaceable Units
Digital Part
FRU
Actuator with LED assembly 29-28116-01 Reset button assembly 29-28117-01 DECstation 212 DECstation 316
LP battery and real time clock 29-28242-01 SX/320SX battery 29-27439-01
Floppy drive ribbon cable assembly 29-28108-01 Floppy drive, 3.5 inch, 1.44 Mbyte 30-30942-01 Option slot PCB assembly 29-28109-01 Keyboard adapter plug 29-28100-01 Top/front cover assembly (without nameplate) 29-28110-01 Bezel, 212 Bezel, 316 DECstation 212 DECstation 316 DECstation 320
LP nameplate not available SX nameplate 29-28117-01
LP utilities diskette 29-28243-01 SX utilities diskette 29-28111-01 SX utilities diskette 29-28854-01
DECstation VGA Graphics Utilities and User Guides (set of two diskettes)
DECstation VGA 1024 Graphics Utilities and User Guides (set of two diskettes)
Number
n/a
n/a
Table 3–2 DECstation Optional Field Replaceable Units
Digital Part
FRU
14" VGM100 Monochrome monitor (US) 30-30902-01 14" VGM300 Color monitor (US) 30-30901-01 14" Color monitor 120V North Hemisphere 30-32313-01
Number
Page 46
FRU Replacement 3–3
Table 3–2 (Cont.) DECstation Optional Field Replaceable Units
Digital Part
FRU
14" Color monitor 120V South Hemisphere 30-32314-01 14" Color monitor 240V North Hemisphere 30-32315-01 14" Color monitor 240V South Hemisphere 30-32316-01 14" Color monitor 120V North Hemisphere 30-32317-01 14" Color monitor 120V South Hemisphere 30-32318-01 14" Color monitor 240V North Hemisphere 30-32319-01 14" Color monitor 240V South Hemisphere 30-32320-01 512 Kbyte 80 ns SIMM Memory Kit (320 512 Kbyte 100 ns SIMM Memory Kit (212lp/316 2 Mbyte 80 ns SIMM Memory Kit (320 2 Mbyte 100 ns SIMM Memory Kit (212lp/316
SX) 19-32974-02
SX) 19-32974-01
SX) 19-32975-02
SX) 19-32975-01
1.2 Mbyte diskette drive, 5.25" 30-31071-01 360 Kbyte diskette drive, 5.25" 30-33156-01 16-bit SCSI adapter board (AHA-1540/A) 20-30945-01 16-bit SCSI adapter board (AHA-1540/B) 20-33154-01 SCSI drive ribbon cable assembly 29-27441-01 SCSI hard disk drive, 40 Mbyte, 3.5" 30-30903-01 SCSI hard disk drive, 80 Mbyte, 3.25" 30-30904-01 SCSI hard disk drive, 170 Mbyte, 5.25" 30-30905-01 SCSI hard disk drive, 320 Mbyte, 5.25" 30-33157-01 Tape drive, 60 Mbyte, (QIC-40) 30-34181-01 Mini-Tape cartridge, 1/4" (QIC-40) 30-?????-01 IDE hard disk drive, 20 Mbyte, 3.5" 30-32375-01 IDE hard disk drive, 40 Mbyte, 3.5" 30-32345-01
Number
Page 47
3–4 FRU Replacement
Table 3–2 (Cont.) DECstation Optional Field Replaceable Units
Digital Part
FRU
IDE hard disk drive, 105 Mbyte, 3.5" 30-34429-01 IDE hard disk drive, 120 Mbyte, 3.5" 30-32344-01 IDE dual drive ribbon cable assembly 29-27912-01 2400 BPS integral modem 30-31072-01 1200 BPS integral modem 30-31073-01 10 MHz Intel 80287 math coprocessor 19-30951-01 16 MHz Intel 80387 20 MHz Intel 80387
SX math coprocessor 19-30973-01 SX math coprocessor 19-?????-01
8514/A-Compatible graphics adapter 20-34173-01 8514/A-Compatible graphics adapter utilities diskette 29-28680-01 8514/A-Compatible VGS ribbon cable 29-28680-01-01 Keyboard, 101-key enhanced MD 29-32503-01 Two-Button mouse, PS/2-Type, Microsoft compatible 30-25322-01 DEPCA adapter 70-24252-01 DEPCA Turbo 70-22837-01 or
115 Vac system box power cord 17-02607-01
Number
-02
Page 48
FRU Replacement 3–5
3.1.1 Before Replacing FRUs
The following criteria apply when removing or installing DECstation FRUs.
CAUTION
After you turn power to the system off, do not disconnect the power cord from the system unit or wall outlet for at least 20 seconds.
Always turn power to the system and monitor off and disconnect all external cables before removing any FRU.
NOTE
Before disconnecting the DECstation from a network, inform the system administrator that you are going to disconnect the ThinWire T-connector from the computer. Do not disconnect any cable or terminator from the T-connector. Doing so disrupts network operation.
CAUTION
Always use a grounded wrist strap and grounded work surface to earth ground when opening the system unit or handling any external component and its replacement. Static electricity can damage printed circuit boards and mass storage devices.
After replacing a FRU, verify that it and the system function properly.
3.2 Replacing FRUs
This section describes how to remove and replace the various FRUs in the DECstation. Figure 3–1 shows an exploded view of the DECstation chassis. Figure 3–2 shows an exploded view of the DECstation main logic board and options.
Page 49
3–6 FRU Replacement
New Illustration LJ-1711
Figure 3–1 Exploded View of DECstation Chassis
Page 50
New Illustration LJ-1710
FRU Replacement 3–7
Figure 3–2 Exploded View of DECstation Main Logic Board and Options
Page 51
3–8 FRU Replacement
3.2.1 Keyboard Replacement
Replace the keyboard as follows:
1. Turn power to the system unit and monitor off.
2. Disconnect the keyboard cable from the system unit.
3. Connect the cable from the new keyboard to the system unit.
4. Turn the power on again.
3.2.2 Monitor Replacement
Replace the monitor as follows:
1. Turn power to the system unit and monitor off.
2. Unplug the power cord to the system unit from the auxilliary outlet of the DECstation.
3. Disconnect the monitor cable from the system unit.
4. Connect the cable from the new monitor to the system unit.
5. Plug the power cord from the system unit into the auxilliary outlet of the DECstation.
6. Turn the power on again.
3.2.3 Mouse Replacement
Replace the mouse as follows:
1. Turn power to the system unit and monitor off.
CAUTION
All power must be off when connecting or disconnecting the mouse or damage to the mouse and/ or main logic board will result.
2. Disconnect the mouse cable from the system unit.
3. Connect the cable from the new mouse to the system unit.
4. Turn the power on again.
Page 52
FRU Replacement 3–9
3.2.4 System Cover Removal
Remove the system cover as follows:
1. Turn power to the system unit and monitor off.
CAUTION
To avoid damage to the hard disk, do not move or perform the following procedure for at least 20 seconds after you turn power to the system off.
2. Disconnect all cables from the back of the system unit.
3. Remove the two countersunk screws that secure the cover to the chassis of the system unit (Figure 3–3).
4. Slide the cover forward about three inches to clear the locating pins on the inside of the front bezel and remove the cover (Figure 3–3).
New Illustration LJ-1709
Figure 3–3 Removing the DECstation System Cover
Page 53
3–10 FRU Replacement
3.2.5 Opening the System Unit
Open the system unit as follows (Figure 3–4):
1. Using the key, unlock the system box.
2. Remove the two shake-proof fittings that secure the system unit option cover and carriage (metal fold-outs).
3. Lift the option cover (left side) counter-clockwise and remove.
4. Lift the carriage (right side) clockwise.
Page 54
New Illustration LJ-1708
FRU Replacement 3–11
Figure 3–4 Opening the DECstation System Unit
Page 55
3–12 FRU Replacement
3.2.6 Option Board Replacement
The procedure for replacing an option board in the DECstation is similar for the different options in the system.
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Note the position of all cables (if any) connected to the option board and disconnect them.
NOTE
When removing an option board note it’s location and the location and routing of all cables (if any) attached to the option board.
3. Remove the mounting screw that secures the option board to the chassis.
4. Remove the board by sliding it to the left and out of the expansion slot connector.
5. Configure the jumpers and switches on the new board to match those on the old board.
6. Install the new board in the slot from which the old board was removed. Make sure the board is firmly seated in the connector(s) on the bus adapter board.
7. Secure the board to the chassis with the mounting screw.
8. Reconnect any cables you removed.
Page 56
FRU Replacement 3–13
3.2.7 Option Slot Printed Circuit Board Replacement
Remove the option slot printed circuit board (PCB) as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove the two screws that secure the chassis support to the system unit, one in the front of the system unit and one in the rear of the chassis support (Figure 3–5).
3. Lift the chassis support and option slot PCB upward and out of the system unit (Figure 3–5).
4. Remove the two screws securing the option slot PCB to the chassis support (Figure 3–5).
5. Secure the new option slot PCB to the chassis support (Figure 3–5).
6. Re-install the chassis support and option slot PCB by reversing these steps.
CAUTION
There is a mylar insulator in back of the option slot PCB. Make sure it is installed and in position when replacing the option slot PCB.
NOTE
When replacing the chassis support make sure the slotted tab at the rear connects to the rear panel.
Page 57
3–14 FRU Replacement
New Illustration LJ-1707
Figure 3–5 Removing the Bus Adapter Board
Page 58
FRU Replacement 3–15
3.2.8 Speaker Replacement
Replace the speaker as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Disconnect the speaker cable from the main logic board (Figure 3–1).
3. Remove two 5/16-inch nuts and lock washers securing the speaker to the bottom of the chassis (Figure 3–1).
4. Remove the speaker. Replace the speaker and connect the cable to the main logic
board.
3.2.9 Battery Replacement
Replace the battery as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove the battery as follows:
On the DECstation 212LP, remove the battery by lifting it
out of the socket on the main logic board (Figure 3–6).
On the DECstation 316SX and DECstation 320SX, remove
the cable from J3 on the main logic board (Figure 3–7). Remove the battery from the system unit by pulling it off the Velcro mounting strip.
WARNING
Do not dispose of the battery at the customer site. Do not burn the battery or take it apart.
3. Replace the battery by reversing the steps.
Page 59
3–16 FRU Replacement
New Illustration LJ-1706
Figure 3–6 Removing the DECstation 212LP Battery
Page 60
New Illustration LJ-1705
FRU Replacement 3–17
Figure 3–7 Removing the DECstation 316SX/ 320SX Battery
3.2.10 Reset Button Removal
Remove the reset button as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove all option boards from the system unit (if any) (Section 3.2.6).
Page 61
3–18 FRU Replacement
3. Disconnect the reset button cable from the main logic board (Figure 3–8).
4. Depress the option board card guide clip (Figure 3–8).
5. Slide the card guide to the left and remove it from the system unit (Figure 3–8).
6. From the back of the card guide, push the reset button (and cable) forward through the card guide (Figure 3–8).
Replace the reset button by reversing these steps.
New Illustration LJ-1704
Figure 3–8 Removing the Reset Button
Page 62
FRU Replacement 3–19
3.2.11 Single-In-Line Memory Module Replacement
Replace the Single-In-Line Memory Modules (SIMMs) as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove any option boards that might obstruct the removal and installation of SIMMs.
3. Use both hands and spread the retaining clips that hold the SIMM in place (Figure 3–9 and Figure 3–10).
4. Move the SIMM forward to the vertical position (Figure 3–9 and Figure 3–10).
5. Use your index fingers to pull the SIMM away from the retaining brackets (Figure 3–9 and Figure 3–10) and remove the SIMM.
6. Grasp the SIMM at both ends and insert it into the socket (Figure 3–9 and Figure 3–10) and replace the SIMM. Make sure the SIMM is fully seated in the connector.
7. Press backward and down on the SIMM to lock it into place.
NOTE
The number of chips on the SIMM modules may vary based on the vendor.
Page 63
3–20 FRU Replacement
Insert version LJ-1703
Figure 3–9 Removing and Replacing the 212LP SIMM
Page 64
Insert version LJ-1784
FRU Replacement 3–21
Figure 3–10 Removing and Replacing the 316SX/320SX SIMM
Page 65
3–22 FRU Replacement
3.2.12 Math Coprocessor Replacement
Replace the math coprocessor as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Locate the math coprocessor on the main logic board (Figure 3–11 and Figure 3–12).
3. Remove the math coprocessor as follows:
DECstation 212LP: Use a small, flat-blade screwdriver and
alternately lift each end of the coprocessor. (Figure 3–11).
DECstation 316SX and DECstation 320SX: Use a special
tool to simultaneously lift each corner of the coprocessor. (Figure 3–12).
NOTE
While lifting the coprocessor out of the socket be careful not to damage it or the socket, or bend any pins.
4. Before installing the new math coprocessor, straighten any pins (if necessary) so they align with the holes in the socket.
5. Make sure pin 1 of the math coprocessor is aligned with pin 1 of the socket.
NOTE
Facing the front of the DECstation 212LP, the pin 1 location is indicated by a dot near the lower left corner of the socket (Figure 3–11).
Facing the front of the DECstation 316SX and DECstation 320SX, the pin 1 location is indicated by a numeral 1 near the lower right corner of the socket (Figure 3–12).
6. Install the new math coprocessor in the socket by alternately pressing each end into the socket. Do this until it is firmly seated in the socket (Figure 3–11 and Figure 3–12).
Page 66
Insert version LJ-1701
FRU Replacement 3–23
Figure 3–11 Replacing the 212LP Math Coprocessor
Page 67
3–24 FRU Replacement
New Illustration LJ-1700
Figure 3–12 Replacing the 316SX Math Coprocessor
Page 68
New Illustration LJ-1785
FRU Replacement 3–25
Figure 3–13 320SX Math Coprocessor Replacement
Page 69
3–26 FRU Replacement
3.2.13 Main Logic Board Replacement
Replace the main logic board as follows:
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove all option boards and their cables, if any, (Section 3.2.6).
3. Remove the system unit chassis support and bus adapter board (Section 3.2.7).
4. Remove all the SIMMs installed on the main logic board (Section 3.2.11).
5. Remove the math coprocessor if one is installed (Section 3.2.12).
6. Remove the power supply, power on LED, floppy/ hard/ tape drive interface, and IDE interface cables attached to the main logic board (Figure 3–14 and Figure 3–15).
NOTE
When removing the cables note their location and routing.
7. Remove six 3/16-inch hex standoffs that secure the serial, parallel, and monitor connectors to the system unit (Figure 3–14 and Figure 3–15).
NOTE
The connectors are soldered to the main logic board. Each connector (and main logic board) is secured to the system unit by the six standoffs.
8. Remove the six screws securing the main logic board to the system unit (Figure 3–14 and Figure 3–15).
9. Remove the main logic board (Figure 3–14 and Figure 3–15).
10. Set all switches and jumpers on the new main logic board to the same positions as those set on the old main logic board.
11. Install all options (if any) that were removed from the old main logic board onto the new main logic board.
Page 70
FRU Replacement 3–27
12. Replace the main logic board by reversing the steps used to remove the board.
NOTE
There is a mylar insulator under the main logic board. Make sure it is installed and in position when replacing the main logic board (Figure 3–14 and Figure 3–15).
New Illustration LJ-1699
Figure 3–14 Removing the 212LP Main Logic Board
Page 71
3–28 FRU Replacement
New Illustration LJ-1698
Figure 3–15 Removing the 316SX Main Logic Board
Page 72
New Illustration LJ-1786
FRU Replacement 3–29
Figure 3–16 Removing the 320SX Main Logic Board
Page 73
3–30 FRU Replacement
3.2.14 Floppy Drive Replacement
Replace the floppy drive as follows (Figure 3–17):
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove the ribbon cable from the back of the drive.
3. Remove the three mounting screws that hold the drive in place. One screw is located underneath the left side and two are on the right side of the floppy.
4. Remove the floppy disk drive.
5. Set the switch on the new drive to match that of the old drive.
6. Install the new drive and re-install the three mounting screws
7. Reconnect the ribbon cable to the floppy drive.
8. After replacing the drive reconnect all system cables.
9. Verify the operation of the new drive.
10. Reinstall the system cover.
3.2.15 Replacing An Optional Floppy Drive
To remove or replace an optional floppy disk drive, refer to the appropriate option installation guide.
3.2.16 Replacing an Optional Hard Disk or Tape Drive
To remove or replace an optional hard disk or tape drive, refer to the appropriate option installation guide.
Page 74
New Illustration LJ-1697
FRU Replacement 3–31
Figure 3–17 Replacing the Floppy Disk Drive
Page 75
3–32 FRU Replacement
3.2.17 DECstation Power Supply Removal
Remove the DECstation power supply as follows (Figure 3–18):
1. Remove the cover (Section 3.2.4) and open the system unit (Section 3.2.5).
2. Remove the ribbon cable from the back of the drive.
3. Disconnect the power supply and power on LED cables from the main logic board.
4. Remove the LED actuator arm from the power supply by sliding the tie wrap toward the front of the system unit and lifting the arm up and off the power supply switch.
5. Facing the front of the system unit, remove the three mounting screws on the right side of the power supply.
6. Tilt the carriage up 90° and remove the two screws on top of the carriage holding the power supply.
7. Separate the power supply unit from the system unit by sliding it away from the front of the system unit.
NOTE
Check the power supply fuse before installing a new power supply. The fuse is rated at 4 AMPS/ 250 Vac and is approx. 3/4 inch in length.
To replace the power supply unit perform the previous steps in reverse order.
Page 76
New Illustration LJ-1696
FRU Replacement 3–33
Figure 3–18 Removing the DECstation Power Supply
Page 77
3–34 FRU Replacement
3.3 Main Logic Board Jumpers
3.3.1 212LP Main Logic Board Jumpers
Figure 3–19 shows the location of the jumpers on the main logic board. Table 3–3 describes the jumper configurations and provides a recommended default setting for the jumpers.
New Illustration LJ-1695
Figure 3–19 212LP Main Logic Board Jumper Locations
Page 78
FRU Replacement 3–35
Table 3–3 212LP Main Logic Board Jumper Settings
Feature Description Jumper Setting
Video interrupt Standard
IRQ9 E12 and E13, installed
On-board video Enabled
Disabled E14 and E15, installed
BIOS ROM type 4 Mbyte or 8 Mbyte
ROM Two 32 Kbyte
EEPROMs (U17 and U18)
Expansion bus speed
Same as system clock speed
One-half system clock speed
Memory parity
Enabled
check
Disabled E6 and E7, installed
1
E12 and E13, No connection
1
1
E15 and E16, installed
E10 and E11, installed
E9 and E10, installed
1
E2 and E4, installed
E4 and E8, installed
1
E5 and E6, installed
1
Default Setting
Page 79
3–36 FRU Replacement
3.3.2 316SX Main Logic Board Jumpers
Figure 3–20 shows the location of the jumpers on the main logic board. Table 3–4 describes the jumper configurations and provides a recommended default setting for the jumpers.
New Illustration LJ-1694
Figure 3–20 316SX Main Logic Board Jumper Locations
Page 80
FRU Replacement 3–37
Table 3–4 316SX Main Logic Board Jumper Settings
Feature Description Jumper Setting
Math coprocessor
80387SX installed 80387SX not installed
1
BIOS ROM type 128 Kbyte (16 KB) E2 and E3, installed
256 Kbyte (32 KB)
512 Kbyte (64 KB) E1 and E2, installed
Printer port interrupt
Serial port interrupt
Video mode Color monitor
IRQ5 select IRQ7 select
IRQ3 select IRQ4 select
1
1
1
Monochrome monitor
Video port interrupt
Disable IRQ9 Enabled IRQ9
On-board video VGA enabled
1
1
VGA disabled
E30 and E31, installed E31 and E32, not installed
E5 and E6, installed
1
E1 and E2, installed E5 and E6, installed
E4 and E5, installed E19 and E20, installed
E20 and E21, installed E16 and E18, installed
E14 and E16, installed E7 and E8, installed
E8 and E9, installed E25 and E26, No
connection E26 and E27, installed
E33 and E34, installed E34 and E35, installed
1
Default Setting
Page 81
3–38 FRU Replacement
3.3.3 DECstation 316SX Main Logic Board Switch
Settings
Figure 3–21 shows the location of the switch on the main logic board. Table 3–5 describes the switch configurations and provides a recommended default setting for each switch.
New Illustration LJ-1693
Figure 3–21 DECstation 316SX Main Logic Board Switch Location
Page 82
FRU Replacement 3–39
Table 3–5 DECstation 316SX Main Logic Board Switch Settings
Switch
Feature Description
Parallel Port Enable (SW1)
Parallel Port Address(SW2)
Serial Port Enable (SW3)
Serial Port Address (SW4)
Parallel Port Mode (SW5)
Diskette Drive Address (SW6)
IDE Drive Enable (SW7)
IDE Drive Address (SW8)
Enabled Disabled
LPT1= 378-37F HEX LPT2= 278-27F HEX
Enabled Disabled
COMM1= 3F8-3FF HEX COMM2= 2F8-2FF HEX
Enabled unidirectional Enabled bi-directional
Primary= 3F0-3F7 HEX Secondary= 370-377 HEX
Enable IDE connector Disable IDE connector
Primary= 1F0-1F7 HEX for CS0
1
1
376-377 HEX for CS1
Secondary= 170-177 HEX for CS0
1
1
1
1
1
1
376-377 HEX for CS1
Setting
SW1, on SW1, off
SW2, on SW2, off
SW3, on SW3, off
SW4, on SW4, off
SW5, on SW5, off
SW6, on SW6, off
SW7, on SW7, off
1
SW8, on
SW8, off
1
Default Setting
Page 83
3–40 FRU Replacement
3.3.4 320SX Main Logic Board Jumpers
Figure 3–22 shows the location of the jumpers on the main logic board. Table 3–6 describes the jumper configurations and provides a recommended default setting for the jumpers.
New Illustration LJ-1787
Figure 3–22 320SX Main Logic Board Jumper Locations
Page 84
FRU Replacement 3–41
Table 3–6 320SX Main Logic Board Jumper Settings
Feature Description Jumper Setting
BIOS ROM Type 256 Kbyte
(32 KBx8)
Reserved for future use
Parallel port interrupt
Serial port interrupt
Video mode Color
Reserved for future use
IRQ5
1
IRQ7 IRQ3
1
IRQ4
1
Monochrome monitor
Video interrupt Disable
1
Enabled IRQ9
On-Board video enable
1
Default Setting
Enabled VGA disabled
1
1
E5 and E6, installed E1 and E2, installed
Reserved for future use
E13 and E14, installed E14 and E15, installed
E17 and E18, installed E16 and E17, installed
E8 and E9, installed E7 and E8, installed
E22, E23, and E24 fixed
E19 and E20, installed E20 and E21, installed
Page 85
3–42 FRU Replacement
3.3.5 DECstation 320SX Main Logic Board Switch
Settings
Figure 3–23 shows the location of the switch on the main logic board. Table 3–7 describes the switch configurations and provides a recommended default setting for each switch.
New Illustration LJ-1788
Figure 3–23 DECstation 320SX Main Logic Board Switch Location
Page 86
FRU Replacement 3–43
Table 3–7 DECstation 320SX Main Logic Board Switch Settings
Switch
Feature Description
Parallel port Enabled
1
Disabled
Parallel port address
LPT1= 378-37F HEX LPT2= 278-27F HEX
Serial port Enabled
1
1
Disabled
Serial port address
COMM1= 3F8-3FF HEX COMM2= 2F8-2FF HEX
Parallel port mode Enabled unidirectional
1
1
Enabled bi-directional
Diskette drive address
Primary= 3F0-3F7 HEX Secondary= 370-377 HEX
IDE drive Enable IDE connector
1
1
Disable IDE connector
IDE drive address Primary= 1F0-1F7 HEX for CS0
376-377 HEX for CS1
Secondary= 170-177 HEX for CS0
376-377 HEX for CS1
1
Setting
SW1, on SW1, off
SW2, on SW2, off
SW3, on SW3, off
SW4, on SW4, off
SW5, on SW5, off
SW6, on SW6, off
SW7, on SW7, off
1
SW8, on
SW8, off
1
Default Setting
Page 87
A
PowerConsumption
The following table lists the power consumption for the DECstation base systems.
NOTE
The reserve current row indicates the amount of current available for options and may be distributed between the other slots as needed.
Table A–1 DECstation Base System Power Consumption
Current
+5 Volts Amps
-12 Volts Amps
+12 Volts Amps
+12 Peak Amps
DC Power (VA)
Available current
Current required
Reserve current
Power consumed
Power available
12.80 0.300 2.700 5.00
2.70 0.024 0.030
10.10 0.280 2.670 5.00
13.50 0.120 0.150 13.77
———— 86.23
A–1
Page 88
B
PeripheralInterface
The following tables list the pin assignments and function of each peripheral interface connector on the rear panel of the DECstation systems.
Table B–1 Parallel I/O Port Connector
Pin Number Function
1 Strobe 2 Data bit 0 3 Data bit 1 4 Data bit 2 5 Data bit 3 6 Data bit 4 7 Data bit 5 8 Data bit 6 9 Data bit 7 10 Acknowledge 11 Busy 12 Paper end 13 Select 14 Auto feed 15 Error 16 Initialize
B–1
Page 89
B–2 Peripheral Interface
Table B–1 (Cont.) Parallel I/O Port Connector
Pin Number Function
17 Select in 18 to 25 Ground
Table B–2 RS-232C Serial Port Connector
Pin Number Function
1 Carrier detect 2 Receive data 3 Transmit data 4 Data terminal ready 5 Signal ground 6 Data set ready 7 Request to send 8 Clear to send 9 Ring indicator
Table B–3 Keyboard and Mouse Connectors
Pin Number Function
1 Data 2 Reserved 3 Ground 4 +5 Vdc 5 Clock 6 Reserved
Page 90
Table B–4 Video Port Connector
Pin Number Function
1 Red video 2 Green video 3 Blue video 4 Monitor ID bit 2 (not used) 5 Ground 6 Red return (ground) 7 Green return (ground) 8 Blue return (ground) 9 Key (no pin) 10 Sync return (ground) 11 Monitor ID bit 0 (not used) 12 Monitor ID bit 1 (not used) 13 Horizontal sync 14 Vertical Sync 15 Not used
Peripheral Interface B–3
NOTE
The monitor type (color or monochrome) is determined when power to the system is turned on.
NOTE
Monochrome monitors use the green video for all video input and ignore the red and blue video.
NOTE
A monochrome monitor does not use the monitor ID bits.
Page 91
Loading...