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Foreword
Notice
The information in this guide is subject to change without notice.
Compaq Computer Corporation shall not be liable for technical or editorial
errors or omissions contained herein; nor for incidental or consequential
damages resulting from the furnishing, performance, or use of this material.
This document contains proprietary information protected by copyright. No
part of this document may be photocopied or reproduced in any form with out
prior written consent from Compaq Computer Corporation.
Copyright 1986 by Compaq Computer Corporation.
All rights are reserved.
COMPAQ, COMPAQ PLUS and COMPAQ PORTABLE 286 are registered trademarks and
COMPAQ PORTABLE II is a trademark of COMPAQ Computer Corporation.
The software described in this document is furnished under a license
agreement of nondisclosure. The software may be used or copied only in
accordance with the terms of the agreement. It is against the law to copy
Microsoft BASIC or MS-DOS onto cassette tape, fixed disk drive, diskette, or
any other medium for any purpose other than the purchaser's personal use.
Copyright 1981, 1982, 1983, 1984, 1985, and 1986 by Microsoft Corporation.
MS-DOS is a registered trademark of Microsoft Corporation.
MAINTENANCE AND SERVICE GUIDE COMPAQ PORTABLE COMPUTER COMPAQ PLUS PERSONAL COMPUTER COMPAQ PORTABLE 286 PERSONAL COMPUTER
Second Edition (April 1986)
Assembly Number 102901-001
Binder Number 102900-001
Text Number 102973-001
Compaq Computer Corporation 90 Day Limited Warranty
Compaq Computer Corporation (Compaq) warrants the products that it
manufactures to be free from defects in materials and workmanship for a period
of 90 days from the date of purchase from Compaq or an Authorized COMPAQ
Computer Dealer. This warranty is limited to the original purchaser
(Purchaser) of the product and is not transferable.
During the 90 day (ninety day) warranty period, Compaq will repair or replace
with new or refurbished parts, at its option, any defective parts at no
additional charge, provided that the product is returned, shipping prepaid, to
Compaq or an Authorized COMPAQ Computer Dealer. The Purchaser is responsible
for insuring any product so returned and assumes the risk of loss during
shipping. All replaced parts and products become the property of Compaq.
Dated proof of purchase must be provided by the Purchaser when requesting that
warranty work be performed. The Purchaser may request information on how to
obtain warranty service by contacting an Authorized COMPAQ Computer Dealer or
writing to Compaq Computer Corporation for further information.
This limited warranty does not extend to any products that have been damaged
as a result of accident, misuse, abuse, non Compaq modification, or as a
result of service by anyone other than Compaq or an Authorized COMPAQ Computer
Dealer.
Except as expressly set forth above, no other warranties are expressed or
implied, including, but not limited to, any implied warranties of
merchantability and fitness for a particular purpose, and Compaq expressly
disclaims all warranties not stated herein in the event the product is not
free from defects as warranted above, the purchaser's sole remedy shall be
repair or replacement as provided above. Under no circumstances will Compaq
be liable to the purchaser or any user for any damages, including any
incidental or consequential damages, expenses, lost profits, lost savings, or
other damages arising out of the use of or inability to use the product.
Some states do not allow the exclusion of limitation of incidental or
consequential damages for consumer products, and some states do not allow
limitations on how long an implied warranty lasts, so the above limitations or
exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other
rights that vary from state to state.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
WARNING
This equipment 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, and so on.)
certified to comply with the Class B limits may be attached to this computer.
Operation with noncertified peripherals is likely to result in interference to
radio and TV reception.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
WARNING
This equipment generates, uses, and can radiate radio frequency energy. If
not installed and used in accordance with the manufacturer's instructions, it
may cause interference with radio and television reception. This equipment
has been certified to comply with the limits for a Class B computing device,
pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide
reasonable protection against such interference. If this occurs, the user
will be required to take whatever measures may be necessary to eliminate the
interference. In attempting to do so, the user should:
o Reorient the receiving antenna.
o Relocate the computer with respect to the receiver with which it
interferes.
o Plug the computer into a different AC outlet so that the computer and the
receiver with which it interferes are on different branch circuits.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
If necessary, the user should consult an Authorized COMPAQ Computer Dealer or
any experienced radio/television technician for additional suggestions.
Compaq Computer Corporation requires that all peripheral devices be connected
to this computer via shielded cables with metal RFI/EMI connector hoods.
Wire Type: Multipaired overall shielded; Belden #98xx; Alpha #54xx; or
equivalent.
Connector Hood: RFI/EMI metal shield; AMP #745l7x-x; or equivalent.
It is important that the chassis ground of any peripheral device be connected
to the computer chassis. An Alpha #1221 flat braided strap is sufficient.
This strap is not necessary if the shielded cable connects the two chassis.
Preface
The Maintenance and Service Guide is a troubleshooting, maintenance, and
repair guide that can be used as a reference when servicing the COMPAQ
Portable Computer, the COMPAQ PLUS Personal Computer, and the COMPAQ
PORTABLE 286 Personal Computer.
All troubleshooting and repair procedures are detailed to allow subassembly/
module level repair only.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
CAUTION
Because of the complexity of the individual boards and subassemblies, Compaq
Computer Corporation strongly recommends that you do not attempt to make field
repairs at the component level. Indications of this may void any warranty or
exchange allowances.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Summary of Text
The Maintenance and Service Guide contains the following eight chapters.
Chapter 1 "Operating and Performance Specifications" provides operating and
performance specifications for the COMPAQ Portable, the COMPAQ
PLUS, and the COMPAQ PORTABLE 286 Personal Computers.
Chapter 2 "Power On Self Test (POST)/Problem Isolation" describes the
internal system diagnostics programs that are automatically
executed when you turn on the system. A flowchart is provided for
quick reference for identifying and correcting problems that may
occur during the Power On Self Test procedure.
Chapter 3 "SETUP" describes how to configure the system and defines the
system prompts.
Chapter 4 "DIAGNOSTIC Procedures" describes the use and function of the'
COMPAQ DIAGNOSTIC Program Version 3. The text provides a detailed
description of the various diagnostic routines and how to execute
them.
Chapter 5 "Error Messages and Codes" lists and describes the Power On Self
Test (POST) and DIAGNOSTICS Error Codes. It also provides required
action for resolving each problem described by the corresponding
error code.
Chapter 6 "Illustrated Parts Catalog" contains illustrated parts breakdowns,
order numbers, and part names for the COMPAQ Portable, the COMPAQ
PLUS, and the COMPAQ PORTABLE 286 Personal Computers.
Chapter 7 "Removal and Replacement Procedures" describes how to remove and
replace subassemblies for the COMPAQ Portable, the COMPAQ PLUS, and
the COMPAQ PORTABLE 286 Personal Computers.
Chapter 8 "Jumper Settings, Switch Settings, and Adjustments" provides
detailed information for setting jumpers and switches. It also
provides instructions for adjusting the video display unit and the
diskette drive speed.
Required Tools and Supplies
To service the COMPAQ Portable, COMPAQ PLUS, and COMPAQ PORTABLE 286 Personal
Computers, you need:
o 1/4 inch slotted blade screwdriver (COMPAQ Portable and COMPAQ PLUS
Personal Computers only)
o COMPAQ DIAGNOSTICS Diskette Version 3 (PN 102971-001 *)
o Formatted Scratch Diskette(s)
o Printer loopback plug 25 pin (PN 100755-001)
o Serial loopback plug 25 pin (PN 100754-001)
o 9 pin serial loopback plug (PN 102999-001)
o Torx T-15 screwdriver
o Torx T-10 screwdriver
o 1/4 inch nut driver
o No. 2 Phillips screwdriver
o 5/16 inch Box end wrench
Optional Tools are:
o Digital voltmeter
o Memory chip (integrated circuit) insertion tool
o Memory chip (integrated circuit) removal tool
o Diskette drive signal extension cable (PN 100546-001)
o Diskette drive power extension cable (PN 100545-001)
o Special Service Tool Kit (PN 101089-001) containing:
- Power Supply socket adjustment tool
- T-10 socket
- 3/16 inch socket
- 5/16 inch adjustable socket
Additional Information
The following documentation and related software are available to support
these and other COMPAQ computer products.
Associated Documentation:
o COMPAQ PORTABLE COMPUTER OPERATIONS GUIDE (PN 100001-001)
o COMPAQ PLUS PERSONAL COMPUTER OPERATIONS GUIDE (PN 100633-001 *)
o COMPAQ PORTABLE 286 PERSONAL COMPUTER OPERATIONS GUIDE (PN 101770-001 *)
o AUTHORIZED DEALER GUIDE (PN 100003-001)
o MS-DOS VERSION 2 REFERENCE GUIDE (PN 100631-002 *)
o MS-DOS VERSION 3 REFERENCE GUIDE (PN 102631-001 *)
o BASIC VERSION 2 REFERENCE GUIDE (PN 100632-001 *)
o BASIC VERSION 3 REFERENCE GUIDE (PN 102740-001)
o 80286 BASED PRODUCTS TECHNICAL REFERENCE GUIDE (PN 102786-001)
* Part number no longer available.
Chapter 1. Operating and Performance Specifications
Chapter 1.1 Introduction
This section provides operating and performance specifications for the COMPAQ
Portable and the COMPAQ PLUS in Table 1-1, and the COMPAQ PORTABLE 286
in Table 1-2.
Specifications for the COMPAQ Portable and COMPAQ PLUS Personal Computer are:
o Electrical and mechanical
o Environmental
o Keyboard
o Video display
o 360 Kbyte diskette drive
o 10 megabyte fixed disk drive
o Power supply
Specifications for the COMPAQ PORTABLE 286 Personal Computer are:
o Electrical and mechanical
o Environmental
o Keyboard
o Video display
o 20 megabyte fixed disk drive
o 10 megabyte tape drive
o 1.2 megabyte diskette drive
o 360 Kbyte diskette drive
o Power supply
Table 1-1. COMPAQ Portable and COMPAQ PLUS Personal Computers Operating and
Performance Specifications
==============================================================================
Electrical and Mechanical Specifications
-----------------------------------------------------------------------------Dimensions:
Height 8.5 in. (215.9 mm)
Depth 16.0 in. (406.4 mm)
Width 20.0 in. (512.8 mm)
Weight:
With one diskette drive 27.5 lb (12.5 kg)
With two diskette drives 30.5 lb (13.5 kg)
With one diskette drive
and one fixed disk drive 31 lb (14 kg)
Power Requirements:
Line Voltage 115 VAC
Line Frequency 60 Hz
Power
Current 3 amps
Power Cable:
Length 79 in. (2006.6 mm)
Gauge 18 AWG
Environmental Requirements:
Temperature:
Operating 50oF to 104oF (10oC to 40oC)
Nonoperating 32oF to 140oF (0oC to 60oC)
Humidity:
Operating 20% to 80% (noncondensing)
Nonoperating 5% to 90% (noncondensing)
-----------------------------------------------------------------------------Keyboard Specifications
-----------------------------------------------------------------------------Dimensions:
Height 1.5 in. (38.1 mm)
Depth 7.06 in. (179.3 mm)
Width 18.25 in. (463.6 mm)
Number of Keys 83
Keyboard Cable:
Length 72 in. (1828.8 mm)
Gauge 28 AWG
-----------------------------------------------------------------------------Video Display Specifications
-----------------------------------------------------------------------------Display:
o Nine inch diagonal, 90 degree deflection
o High persistence green phosphor
o Etched surface to reduce glare
o 80 character by 25 line screen
o 40 character by 25 line screen
o 640 x 200 dot resolution, graphics
o 320 x 200 dot resolution, graphics
o 720 x 350 dot resolution, text
-----------------------------------------------------------------------------360 Kbyte Diskette Drive Specifications
-----------------------------------------------------------------------------Dimensions:
Height 1.625 in. (40.625 mm)
Depth 8.29 in. (210.6 mm)
Width 5.88 in. (149.4 mm)
Weight 3.2 lb (1.45 kg)
Data Transfer Rate 250 Kb/s
Media 48 TPI Double Sided Double Density Diskettes
Number of Tracks 40
Tracks per Inch 48
-----------------------------------------------------------------------------10 Megabyte Fixed Disk Drive Specifications
-----------------------------------------------------------------------------Dimensions:
Height 1.69 in. (4.33 cm)
Width 5.875 in. (14.6875 cm)
Depth 8.25 in. (20.625 cm)
Weight 3.5 lb (1.575 kg)
Media Fixed plated media
Tracks per Inch 600
Number of Cylinders 305
Data Transfer Rate 5 Mb/s
Average Access Time 105 ms
-----------------------------------------------------------------------------Power Supply Specifications
-----------------------------------------------------------------------------Input Requirements:
AC Voltage RMS:
Domestic 102 - 132 VAC
International 204 - 264 VAC
Line Frequency 47 to 62 Hz
Line Voltage 120 VAC, 60 Hz
Current 2 amps maximum at input
(3 amps depending on fuse rating)
-----------------------------------------------------------------------------VDC Output: Nominal Current Current Regulation
Voltage Amps Amps Tolerance
VDC Minimum Maximum * Percent
-----------------------------------------------------------------------------+ 5.0 2.0 10.0 5
- 5.0 0.0 0.5 5
+ 12.0 1.0 5.0 5
- 12.0 0.0 0.5 5
------------------------------------------------------------------------------
* These values are maximum values based on nominal operating conditions for
temperature, line voltage, line frequency, and altitude.
==============================================================================
Table 1-2. COMPAQ PORTABLE 286 Personal Computer Operating and Performance
Specifications
==============================================================================
Electrical and Mechanical Specifications
------------------------------------------------------------------------------
Dimensions:
Height 8.5 in. (215.9 mm)
Depth 16 in. (406.4 mm)
Width 20 in. (508.0 mm)
Weight:
Model 1 30 lb (13.5 kg)
Model 2 33 lb (15.0 kg)
Model 3 34 lb (15.4 kg)
Power Requirements:
Line Voltage 115 VAC
Line Frequency 60 Hz
Power
Current 4 amps
Power Cable:
Length 72 in. (1828.8 mm)
Gauge 18 AWG
------------------------------------------------------------------------------
Environmental Requirements
------------------------------------------------------------------------------
Temperature:
Operating 50oF to 104oF (10oC to 40oC)
Nonoperating 32oF to 140oF (0oC to 60oC)
Humidity:
Operating 20% to 80% (noncondensing)
Nonoperating 5% to 90% (noncondensing)
------------------------------------------------------------------------------
Keyboard Specifications
------------------------------------------------------------------------------
Dimensions:
Height 1.5 in. (38.1 mm)
Depth 7.06 in. (179.3 mm)
Width 18.25 in. (436.6 mm)
Number of Keys 84
Keyboard Cable:
Length 72 in. (1828.8 mm)
Gauge 28 AWG
------------------------------------------------------------------------------
Video Display Specifications
------------------------------------------------------------------------------
Display:
o Nine inch diagonal, 90 degree deflection
o High persistence green phosphor
o Etched surface to reduce glare
o 80 character by 25 line screen
o 40 character by 25 line screen
o 640 x 200 dot resolution, graphics
o 320 x 200 dot resolution, graphics
o 720 x 350 dot resolution, text
------------------------------------------------------------------------------
20 Megabyte Fixed Disk Drive Specifications
------------------------------------------------------------------------------
Dimensions:
Height 1.7 in. (4.33 cm)
Depth 4.1 in. (10.41 cm)
Width 5.75 in. (14.61 cm)
Weight 1.8 lb (0.8 kg)
Media Fixed plated media
Number of Data Heads 4
Number of Cylinders 615
Average Access Time 105 ms (maximum)
Data Transfer Rate 5 Mb/s
------------------------------------------------------------------------------
10 Megabyte Tape Drive Specifications
------------------------------------------------------------------------------
Dimensions:
Height 1.65 in. (4.29 cm)
Depth 8 in. (20 cm)
Width 5.65 in. (14.76 cm)
Weight 1.7 lb (0.765 kg)
Media DC 1000 Manufactured by 3M Corporation or
equivalent
------------------------------------------------------------------------------
1.2 Megabyte Diskette Drive Specifications
------------------------------------------------------------------------------
Dimensions:
Height 1.65 in. (4.29 cm)
Depth 8.25 in. (20.625 cm)
Width 5.88 in. (14.7 cm)
Weight 3.2 lb (1.44 kg)
Media 96 and 48 TPI Double Sided High Density Diskettes
Tracks per Inch 96
Number of Tracks 80 (When formatted with MS-DOS)
Data Transfer Rate 300/500 Kb/s
------------------------------------------------------------------------------
360 Kbyte Diskette Drive Specifications
------------------------------------------------------------------------------
Dimensions:
Height 1.60 in. (4.0625 cm)
Depth 8.0 in. (20.625 cm)
Width 5.8 in. (14.7 cm)
Weight 3.2 lb (1.44 kg)
Media 40 TPI Double Sided Double Density Diskettes
Tracks per Inch 48
Number of Tracks 40 (When formatted with MS-DOS)
Data Transfer Rate 250 Kb/s
Power supply specifications:
Input Requirements:
Line 102 to 132 VAC, single phase
Voltage 180 to 264 VAC, single phase
Line Fuse 3 amps 250V fuse for 115 VAC operation,
2.5 amps for 220 VAC operation
Line Frequency 47 to 62 Hz
Cooling Forced air provided by 16 VDC fan
Current 2 amps, maximum at input voltage of 120 VAC,
60 Hz
------------------------------------------------------------------------------
VDC Output: Nominal Current Current Regulation
Voltage Amps Amps Tolerance
VDC Minimum Maximum * Percent
-----------------------------------------------------------------------------+ 5.0 1.5 15.0 2
- 5.0 0.0 0.5 5
+ 12.25 1.0 5.0 2
+ 12.25 0.0 1.5 3
(internal monitor)
- 12.0 0.0 1.0 5
------------------------------------------------------------------------------
* These values are maximum values based on nominal operating conditions for
temperature, line voltage, line frequency, and altitude.
==============================================================================
Chapter 2. Power On Self Tests (POST)/Problem Isolation
Chapter 2.1 Introduction
This section provides a list of assemblies checked by the Power On Self Test
(POST) and a brief description of the types of error codes. The section also
contains preliminary steps to problem isolation of an error condition and a
problem isolation flowchart for quick reference.
Chapter 2.2 Power On Self Test (POST)
A series of diagnostic tests automatically run on every COMPAQ Personal
Computer system when the system is turned on. These tests are called the
Power On Self Test (POST).
POST checks the following assemblies to ensure that the computer system is
functioning properly:
o Keyboard
o Power Supply
o System Board
o Video Display Controller Board
o Fixed Disk Drive Controller Board
o Diskette/Printer Controller Board
o Asynchronous Communications/Clock Board
o System Board
o Memory
POST also detects the type(s) of mass storage device(s) installed in the
computer.
When the computer is turned on, POST automatically starts and runs. If POST
finds an error in the system, error codes (in the form of beeps) are heard or
error codes (numbers) are visible on the monitor. See Chapter 5, "Error
Messages and Codes," for an explanation of error codes.
Chapter 2.3 Preliminary Steps to Problem Isolation
If you encounter an error condition, complete the following preliminary steps
before starting problem isolation.
1. Place the ON/OFF switch in the OFF position.
2. Disconnect the signal cables of any peripheral devices (printers, modems,
and so on) from the computer.
3. Remove the upper access panel and board slots access cover (see Chapter 7,
"Removal and Replacement Procedures.")
When the upper access panel is removed, the system LED, located on the
system board between the expansion slots, is visible.
4. Remove all non COMPAQ options (board, drives, and so on) from the
computer.
5. Install a loopback plug connector in the parallel port and the
asynchronous port and any other location that requires a loopback plug.
NOTE: If you want to test your printer during the printer test or to log
errors to a printer, reconnect the printer now.
6. Verify that the AC power cable is connected to a usable power outlet.
7. Insert the latest version of the COMPAQ DIAGNOSTICS Program diskette into
drive A and close the drive door.
8. Place the ON/OFF switch in the ON position. See Chapter 4, "DIAGNOSTIC
Procedures," for detailed information on problem isolation.
Chapter 2.4 Problem Isolation Flowchart
The problem isolation flowchart provides a quick reference for identifying and
correcting possible problems that may occur during POST. The flowchart gives
troubleshooting procedures for identifying malfunctions and replacing major
assemblies in the computer and directs you to Chapter 4, "Diagnostic
Procedures," and to Chapter 5, "Error Messages and Codes," for more detailed
troubleshooting information.
Chapter 3. Setup
Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current
information on SETUP.
Chapter 4. Diagnostic Procedures
Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current
information on DIAGNOSTICS.
Chapter 5. Error Messages and Codes
Chapter 5.1 Introduction
This section provides Power On Self Test error messages, DIAGNOSTIC error
codes, and memory error codes.
The messages and codes are given in tables that list the message or error
code, a description of the error, and the probable failure or required action
to resolve the error condition.
Chapter 5.2 Power On Self Test Error Messages
This section is divided into two tables. The first table contains Power On
Self Test error messages for the COMPAQ PORTABLE 286 Personal Computer. The
second table contains Power On Self Test error messages for the COMPAQ
Portable and COMPAQ PLUS Personal Computers.
An error message results if a problem is encountered during the Power On Self
Test program. This program runs automatically when the system is turned on.
The tables list the messages, the audible (beep) message, and the probable
failure.
Table 5-1. Power On Self Test Error Messages for the COMPAQ PORTABLE 286
Personal Computer
==============================================================================
Message Beeps Probable Failure
------------------------------------------------------------------------------
101 - I/O ROM Error 1 Long, Option ROM
1 Short
------------------------------------------------------------------------------
101 - ROM Error 1 Long, System ROM
1 Short
------------------------------------------------------------------------------
102 - System Board Failure None System Board
------------------------------------------------------------------------------
162 - System Options Error 2 Short SETUP Utility Incorrect
------------------------------------------------------------------------------
163 - Time & Date Not Set 2 Short Invalid time
------------------------------------------------------------------------------
164 - Memory Size Error 2 Short SETUP Utility Incorrect
Discrepancy
------------------------------------------------------------------------------
XX000B YYZZ - 201 Memory None RAM Failure *
Error
------------------------------------------------------------------------------
301 - Keyboard Error None Keyboard
------------------------------------------------------------------------------
302 - System Unit Security 2 Short System Lock
Lock is Locked, Unlock
System Unit Security Lock
------------------------------------------------------------------------------
303 - Keyboard Controller None Keyboard
Error
------------------------------------------------------------------------------
304 - Keyboard or System None Keyboard
Unit Error
------------------------------------------------------------------------------
* See Section 5.4, "Memory Error Codes," for the location of the defective
memory chip.
------------------------------------------------------------------------------
Message Beeps Probable Failure
------------------------------------------------------------------------------
402 - Monochrome Display 1 Long, Monochrome Display Controller Board
Controller Failure 2 Short
------------------------------------------------------------------------------
501 - Display Controller 1 Long, Video Display or Video Controller
Failure 2 Short Board
------------------------------------------------------------------------------
601 - Diskette Controller None Diskette Controller Board
Error
------------------------------------------------------------------------------
1780 - Disk 0 Failure None Fixed Disk Drive
------------------------------------------------------------------------------
1782 - Disk Controller None Fixed Disk Drive
Failure
------------------------------------------------------------------------------
1790 - Disk 0 Error None Fixed Disk Drive Recalibration
------------------------------------------------------------------------------
Parity Check 2 XX000B None Expansion RAM (Main Memory on COMPAQ
YYZZ * PORTABLE 286)
------------------------------------------------------------------------------
Audible 1 Short Power On successful: COMMON (6 MHz)
speed
------------------------------------------------------------------------------
Audible 2 Short Power On successful: FAST (8 MHz)
speed
------------------------------------------------------------------------------
RESUME = "F1" KEY None Any failure
------------------------------------------------------------------------------
* See Section 5.4, "Memory Error Codes," for the location of the defective
memory chip.
==============================================================================
Table 5-2. Power On Self Test Error Messages for the COMPAQ Portable and
COMPAQ PLUS Personal Computers
==============================================================================
Message Beeps Probable Failure
------------------------------------------------------------------------------
Audible 1 Beep Power On successful
------------------------------------------------------------------------------
1XX 1 Long, System ROM or System Board
1 Short
------------------------------------------------------------------------------
XXYY 20X None Failure
------------------------------------------------------------------------------
3XX or dd 3XX None Keyboard assembly or "stuck" key
------------------------------------------------------------------------------
4XX None Diskette/Printer Board
1 Long, Video Display Unit or Video Controller
2 Short Board
------------------------------------------------------------------------------
5XX 1 Long, Video Display Unit (VDU) or Video
2 Short Controller Board
------------------------------------------------------------------------------
6XX None Disk Drive Assembly
------------------------------------------------------------------------------
170X None Fixed Disk Drive Assembly
==============================================================================
Chapter 5.3 Diagnostic Error Codes
DIAGNOSTIC error codes occur if the system recognizes a problem while running
the COMPAQ DIAGNOSTICS Program. These error codes help identify possible
defective subassemblies.
Table 5.3 lists all possible error codes, a description of the error
condition, and the action required to resolve the error condition.
In each case, the required action lists prioritized steps necessary to
correct the problem. After each step is completed, run DIAGNOSTICS to verify
whether the error condition has been corrected. If the error code reappears,
perform the next step, then run the DIAGNOSTICS Program. Follow this
procedure until the DIAGNOSTICS Program no longer detects an error condition.
For assistance in the removal and replacement of a particular subassembly, see
Chapter 7, "Removal and Replacement Procedures."
Table 5-3. DIAGNOSTIC Error Codes
==============================================================================
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Processor
1yy-xx
------------------------------------------------------------------------------
101 - 01 286 CPU test failed Replace the system board.
------------------------------------------------------------------------------
102 - 01 287 Coprocessor initial The following steps apply to error
status word incorrect codes 102 - 01 through 102 - 15:
102 - 02 287 Coprocessor initial 1. Replace the 287 Coprocessor.
control word incorrect 2. Replace the system board.
102 - 03 287 Coprocessor tag word
not all ones
102 - 04 287 Coprocessor tag word
not all zeros
102 - 05 287 Coprocessor exchange
command failed
102 - 06 287 Coprocessor masked
exception incorrectly
handled
102 - 07 287 Coprocessor unmasked
exception codes incorrectly
handled
102 - 08 287 Coprocessor wrong
mask bit set in status
register
102 - 15 287 socket is unoccupied,
or 287 is inoperative
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
103 - 01 8237 DMA page registers Replace the system board for error
test codes 103 - 01 through 113 - 01.
103 - 02 8237 DMA byte controller
test failed
103 - 03 8237 DMA word controller
test failed
104 - 01 8259 interrupt controller
master test failed
104 - 02 8259 interrupt controller
slave test failed
104 - 03 8259 software RTC is
inoperative
105 - 01 Port bit 6 not at zero
105 - 02 Port bit 5 not at zero
105 - 03 Port bit 3 not at zero
105 - 04 Port bit 1 not at zero
105 - 05 Port bit 0 not at zero
105 - 06 Port bit 5 not at one
105 - 07 Port bit 3 not at one
105 - 08 Port bit 1 not at one
105 - 09 Port bit 0 not at one
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Processor
1yy-xx
------------------------------------------------------------------------------
106 - 01 8042 keyboard controller Replace the system board for error
self test failed codes 103 - 01 through 113 - 01.
107 - 01 CMOS RAM test failed
108 - 02 CMOS interrupt test failed
109 - 01 CMOS clock load data test
failed
109 - 02 CMOS clock rollover test
failed
110 - 01 8254 load data test failed
110 - 02 8254 dynamic test failed
111 - 01 Refresh detect test failed
112 - 01 Speed test slow mode out of
range
112 - 02 Speed test mixed mode out
of range
112 - 03 Speed test fast mode out of
range
112 - 04 Speed test unable to enter
slow mode
112 - 05 Speed test unable to enter
mixed mode
112 - 06 Speed test unable to enter
fast mode
112 - 07 Speed test system error
113 - 01 Protected mode test failed
------------------------------------------------------------------------------
114 - 01 Speaker test failed 1. Replace the speaker.
2. Replace the system board.
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Memory *
2yy-xx
------------------------------------------------------------------------------
201 - 01 Memory machine ID test The following steps apply to error
codes 201 - 01 through 202 - 01:
201 - 02 Memory machine type test (Error during saving test program
failed memory):
201 - 03 Memory machine ID & type 1. Replace VDU controller board.
tests failed 2. Replace the system ROM.
3. Replace the system board.
202 - 01 Memory system ROM checksum
failed
------------------------------------------------------------------------------
203 - 01 Memory write/read test The following steps apply to error
failed codes 203 - 01 through 205 - 03:
203 - 02 Error during saving program 1. Replace the defective memory
memory in write/read test chip if an error code is
accompanied by an XX000B YYZZ
203 - 03 Error during restore of code.
program in write/read test 2. Replace the system board.
204 - 01 Memory address test failed
204 - 02 Error during saving program
memory in address test
204 - 03 Error during restore of
program memory address test
205 - 01 Walking I/O test failed
205 - 02 Error during saving program
memory in walking I/O test
205 - 03 Error during restore of
program memory in walking
I/O test
------------------------------------------------------------------------------
* See Section 5.4, "Memory Error Codes."
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Keyboard
3yy-xx
------------------------------------------------------------------------------
301 - 01 Keyboard short test, 8042 The following steps apply to error
self test failed codes 301 - 01 through 304 - 01:
301 - 02 Keyboard short test, 1. Replace the keyboard.
interface test failed 2. Replace the system board.
301 - 03 Keyboard short test, echo
test failed
301 - 04 Keyboard short test,
keyboard reset failed
302 - 01 Keyboard long test failed
303 - 01 Keyboard LED test, 8042
self test failed
303 - 02 Keyboard LED test, reset
test failed
303 - 03 Keyboard LED test, reset
test failed
303 - 04 Keyboard LED test, LED
command test failed
303 - 05 Keyboard LED test, LED
command test failed
303 - 06 Keyboard LED test, LED
command test failed
303 - 07 Keyboard LED test, LED
command test failed
303 - 08 Keyboard LED test, command
byte restore test failed
303 - 09 Keyboard LED test, LEDs
failed to light
304 - 01 Keyboard typomatic test
failed
------------------------------------------------------------------------------
315 - 01 Security lock is 1. Replace the security lock.
inoperative
315 - 02 Security lock sticks in
locked position
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Printer
4yy-xx
------------------------------------------------------------------------------
401 - 01 Printer failed or not The following steps apply to error
connected codes 401 - 01 through 403 - 01:
402 - 01 Printer data register 1. If a printer is connected, be
failed sure it is turned ON and in
the online mode.
402 - 02 Printer controller register 2. Check switch 2 on the
failed diskette/tape controller board
(see Chapter 8). *
402 - 03 Printer data and controller 3. Replace the printer and/or the
register failed printer controller cable.
4. Replace the diskette/tape
402 - 04 Printer loopback failed controller board. *
5. Replace the system board.
402 - 05 Printer loopback and data
register failed * 286 based COMPAQ Personal
Computers only
402 - 06 Printer loopback and
controller register failed
402 - 07 Printer loopback, data,
and controller register
failed
402 - 08 Printer interrupt test
failed
402 - 09 Printer interrupt and data
failed
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
402 - 10 Printer interrupt and The following steps apply to error
controller register failed codes 401 - 01 through 403 - 01:
402 - 11 Printer interrupt data, and 1. If a printer is connected, be
controller register failed sure it is turned ON and in
the online mode.
402 - 12 Printer interrupt and 2. Check switch 2 on the
loopback failed diskette/tape controller board
(see Chapter 8). *
402 - 13 Printer interrupt, loopback, 3. Replace the printer and/or the
and data register failed printer controller cable.
4. Replace the diskette/tape
402 - 14 Printer interrupt, loopback, controller board. *
and controller register 5. Replace the system board.
failed
* 286 based COMPAQ Personal
402 - 15 Printer interrupt, Computers only
loopback, data, and
controller register failed
402 - 16 Printer unexpected
interrupt received
403 - 01 Printer pattern test failed
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Video Display Unit (VDU)
5yy-xx
------------------------------------------------------------------------------
501 - 01 VDU controller test failed The following steps apply to error
codes 501 - 01 through 512 - 01:
502 - 01 VDU memory test failed
1. Replace the VDU controller
503 - 01 VDU attribute test failed board.
2. Replace the VDU signal cable.
504 - 01 VDU character set test 3. Replace VDU subassembly.
failed 4. Replace the system board.
505-01 VDU9x14character cell
test
506-01 VDU80x25mode8x8
character cell test
failed
507 - 01 VDU 40 x 25 mode test
failed
508 - 01 VDU 320 x 200 mode color
set 0 test failed
509 - 01 VDU 320 x 200 mode color
set 1 test failed
510 - 01 VDU 640 x 200 mode test
failed
511 - 01 VDU screen memory page test
failed
512 - 01 VDU gray scale test failed
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
516 - 01 Lightpen text mode test The following steps apply to error
failed - no response codes 516 - 01 through 516 - 04:
516 - 0 Lightpen text mode test 1. Replace the lightpen.
failed - invalid response 2. Replace the VDU controller
board.
516 - 03 Lightpen medium resolution
mode test failed - no
response
516 - 04 Lightpen medium resolution
mode test - invalid response
------------------------------------------------------------------------------
Diskette Drive
6yy-xx
------------------------------------------------------------------------------
600 - xx Diskette drive ID The following steps apply to all
6yy - xx related error codes.
601 - xx Diskette drive format
1. Check shunt jumper J2 setting
602 - xx Diskette drive read on the diskette/tape
controller board (see
603 - xx Diskette drive write/read/ Chapter 8). *
compare 2. Replace the diskette/tape
controller board. *
604 - xx Diskette drive random seek 3. Replace the diskette drive
drive power and signal cables.
4. Replace the diskette drive
605 - xx Diskette drive ID media assembly.
test 5. Replace the system board.
606 - xx Diskette drive speed test * 286 based COMPAQ Personal
Computers only
607 - xx Diskette drive wrap test
608 - xx Diskette drive write
protect test
609 - xx Diskette drive reset
controller test
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Diskette Drive
6yy-xx
------------------------------------------------------------------------------
610 - xx Diskette drive change line The following steps apply to all
test 6yy - xx related error codes.
610 - 01 Exceeded maximum soft error 1. Check shunt jumper J2 setting
limit on the diskette/tape
controller board (see
610 - 02 Exceeded maximum hard error Chapter 8). *
limit 2. Replace the diskette/tape
controller board. *
610 - 03 Previously exceeded max 3. Replace the diskette drive
soft error limit power and signal cables.
4. Replace the diskette drive
610 - 04 Previously exceeded max assembly.
hard error limit 5. Replace the system board.
610 - 05 Failed to reset controller * 286 based COMPAQ Personal
Computers only
610 - 06 Fatal error while reading
610 - 07 Fatal error while writing
610 - 08 Failed compare of write/
read/compare
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Diskette Drive
6yy-xx
------------------------------------------------------------------------------
6xx - 09 Failed to format a track The following steps apply to all
6yy - xx related error codes.
610 - 10 Failed sector wrap test
1. Check shunt jumper J2 setting
610 - 20 Failed to get drive type on the diskette/tape
controller board (see
610 - 21 ** Failed to get change line Chapter 8). *
status 2. Replace the diskette/tape
controller board. *
610 - 22 Failed to clear change 3. Replace the diskette drive
power and signal cables.
610 - 23 Failed to set drive type in 4. Replace the diskette drive
ID media assembly.
5. Replace the system board.
610 - 24 Failed to read media
* 286 based COMPAQ Personal
610 - 25 Failed to verify media Computers only
610 - 26 Failed to read media in ** The following applies to
speed test 286 based computers:
610 - 27 Failed speed limits For a 1.2 megabyte diskette
drive, replace the diskette
610 - 28 Failed write protect test drive. For a 360 Kbyte
diskette drive, a drive
610 - 29 Failed to read media in modification has not been
file write test performed. See Service
Bulletin 25.
610 - 40 Cylinder 0 Error
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Serial
11yy - xx
------------------------------------------------------------------------------
1101 - 01 Serial Port Test, UART The following steps apply to all
DLAB bit failure 11yy - xx related error codes:
1101 - 02 Serial Port Test, Line 1. Check diskette/tape controller
input or UART fault board for proper shunt jumper
settings (see Chapter 8). *
1101 - 03 Serial Port Test, Address 2. Replace the diskette/tape
line fault controller board.
3. Replace the system board.
1101 - 04 Serial Port Test, Data line
fault * 286 based COMPAQ Personal
Computers only
1101 - 05 Serial Port Test, UART
control signal
1101 - 06 Serial Port Test, ART THRE
bit failure
1101 - 07 Serial Port Test, UART DATA
READY bit failure
1101 - 08 Serial Port Test, UART
TX/RX buffer failure
1101 - 09 Serial Port Test, INTERRUPT
circuit failure
1101 - 10 Serial Port Test, COM 1 set
to interrupt 3
------------------------------------------------------------------------------
Error Error Required
Code Description Action
------------------------------------------------------------------------------
Serial
11yy - xx
------------------------------------------------------------------------------
1101 - 11 Serial Port Test, COM 2 The following steps apply to all
set to interrupt 4 11yy - xx related error codes:
1101 - 12 Serial Port Test, 1. Check diskette/tape controller
DRIVER/RECEIVER control board for proper shunt jumper
signal failure settings (see Chapter 8). *
2. Replace the diskette/tape
1101 - 13 Serial Port Test, UART controller board.
control signal interrupt 3. Replace the system board.
failure
* 286 based COMPAQ Personal
1101 - 14 Serial Port Test, Computers only
DRIVER/RECEIVER data failure
1109 - 01 Serial Clock Test, register
initialization failure
1109 - 02 Serial Clock Test, register
rollover failure
1109 - 03 Serial Clock Test, clock
reset failure
1109 - 04 Serial Clock Test, input
line or clock failure
1109 - 05 Serial Clock Test, address
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