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Portable II

Compaq Portable II Maintenance And Service Manual

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Page 1
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 guide contains information protected by copyright. No part of this guide may be photocopied or reproduced in any form without prior written consent from Compaq Computer Corporation.
COMPAQ, DESKPRO, SYSTEMPRO, FASTART, Registered United States Patent and Trademark Office.
The software described in this guide is furnished under a license agreement or nondisclosure agreement. The software may be used or copied only in accordance with the terms of the agreement.
Product names mentioned herein are for identification purposes only and may be trademarks and/or registered trademarks of their respective companies.
COMPAQ PORTABLE II PERSONAL COMPUTER MAINTENANCE AND SERVICE GUIDE
Second Edition (December 1990) First Edition (February 1986) Manual Assy No. 101206-002 Text PN 104208-002 Binder PN 104207-001
Preface This publication is intended as a reference for technicians trained to repair the COMPAQ PORTABLE II Personal Computer.
Summary of Text
This guide contains the following eight chapters:
Chapter 1, "Operating and Performance Specifications," provides physical, environmental, and performance specifications for the COMPAQ PORTABLE II Personal Computer.
Chapter 2, "Power On Self Test," describes the internal system diagnostic programs that execute automatically when the system is turned on. It also includes a quick reference for identifying and correcting problems that could occur during the Power On Self Test procedure.
Chapters 3 and 4: Please see the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for information on the SETUP and ADVANCED DIAGNOSTICS programs.
Chapter 5, "Error Messages and Codes," lists the Power On Self Test (POST) and DIAGNOSTICS Error Codes and provides the course of action necessary to resolve the problem.
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Chapter 6, "Illustrated Parts Catalog," provides an illustrated reference for COMPAQ PORTABLE II Personal Computer spare parts.
Chapter 7, "Removal and Replacement Procedures," describes how to remove and replace field replaceable subassemblies.
Chapter 8, "Jumper Settings, Switch Settings, and Adjustments," provides detailed information for setting jumpers and switches and performing monitor adjustments.
Tools and Supplies
The following tools and supplies are required to service the COMPAQ PORTABLE II Personal Computer:
o Torx screwdrivers, sizes T-15 and T-10 o Slotted blade screwdriver, 1/4 inch o Needlenosed pliers o 25 pin printer loopback plug o 25 pin serial loopback plug o 9 pin serial loopback plug o DIAGNOSTICS diskette o Formatted diskette
Optional Tools
o Memory chip insertion tool o Memory chip removal tool o Diskette drive signal extension cable (PN 100546-001) o Diskette drive power extension cable (PN 100545-001) o Socket/Torx tool kit (PN 101089-001)
- Torx screwdrivers, sizes T-15 and T-10
- Adjustable socket tool with hex sockets and one Torx socket (T-10)
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
CAUTION
Only trained technicians should attempt to repair this equipment. All troubleshooting and repair procedures are detailed to allow subassembly/module level repair only.
Because of the complexity of the individual boards and subassemblies, no one should attempt to make repairs at the component level or make modifications to any printed wiring board. Improper repairs may create a safety hazard. Indications of component replacement or printed wiring board modifications may void any warranty or exchange allowances.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Additional Reference Information
The following support documentation is available for the COMPAQ PORTABLE II
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Personal Computer.
o Operations Guide o MS-DOS VERSION 3 REFERENCE GUIDE o Technical Reference Guide o HOW TO DO BUSINESS WITH COMPAQ SERVICE o COMPAQ SERVICE QUICK REFERENCE GUIDE o COMPAQ Service Advisories and Bulletins o COMPAQ QuickFind Support Reference Library
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
WARNING
The computer is designed to be electrically grounded. To ensure proper operation of the computer, plug the AC power cord only into a properly grounded AC outlet.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Compaq Computer Corporation requires 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 #7451 7X-X; or equivalent.
It is important that the chassis ground of any peripheral device be connected to the computer chassis. An Alpha #1221 flat braid strap is sufficient. This strap is not necessary if the shielded cable connects the two chassis.
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Chapter 1. Operating and Performance Specifications
Chapter 1.0 Introduction
This chapter contains operating and performance specifications for the COMPAQ PORTABLE II Personal Computer.
Chapter 1.1 System Unit
Table 1-1. Electrical and Mechanical Specifications ============================================================================== Dimensions:
Height 7.5 in. (19.0 cm) Depth 13.9 in. (35.3 cm) Width 17.7 in. (45.0 cm)
-----------------------------------------------------------------------------­Weight Model 1 23.6 lb (10.7 kg)
-----------------------------------------------------------------------------­Power Requirements:
Voltage 120 VAC 220 - 240 VAC Frequency 60 Hz 50 Hz Current 3A 2.5A
-----------------------------------------------------------------------------­AC Power Cable:
Length 79 in. (2 m) Gauge 18 AWG
-----------------------------------------------------------------------------­Environmental Requirements:
Temperature:
Operating 10oC to 40oC (50oF to 104oF) Nonoperating 10oC to 60oC (50oF to 140oF) Shipping -30oC to 60oC (-22oF to 140oF)
Model 2 25.6 lb (11.6 kg) Model 3 26.2 lb (11.9 kg) Model 4 26.3 lb (12.2 kg)
Humidity:
Operating 20% to 80% (noncondensing) Nonoperating 5% to 90% (noncondensing
Shock:
Operating 5 g, 11 ms, half sine Nonoperating 35 g, 11 ms, half sine
Vibration:
Operating 0.5 g, 5 - 550 Hz Nonoperating 1.0 g, 5 - 550 Hz
Heat Dissipation:
Delivered 410 BTU/hr at 120W Total Watts 615 BTU/hr at 180W
Maximum Unpressurized Altitude:
Operating 10,000 ft (3048 m) Nonoperating 30,000 ft (9144 m)
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==============================================================================
Chapter 1.2 Keyboard
Table 1-2. Keyboard Specifications ============================================================================== Dimensions:
Height 1.3 in. (3.30 cm) Depth 7.0 in. (17.78 cm) Width 17.1 in. (43.43 cm)
Number of Keys 84
Keyboard:
Cable Length 60.00 in. (152.4 cm) Coil Diameter 0.75 in. (1.9 cm) Coil Length 11.00 in. (27.94 cm)
==============================================================================
Chapter 1.3 Video Display Unit
Table 1-3. Video Display Unit Specifications ============================================================================== Display 9 in. diagonal
90 degree deflection High persistence green phosphor Etched surface to reduce glare
Display Size 80 character by 25 line screen
40 character by 25 line screen
Graphic Resolution 640 x 200 dot resolution
320 x 200 dot resolution
Text Resolution 720 x 350 dot resolution ==============================================================================
Chapter 1.4 10 Megabyte Fixed Disk Drive
Table 1-4. 10 Megabyte Fixed Disk Drive Specifications ============================================================================== Dimensions:
Height 1.7 in. (4.32 cm) Depth 5.80 in. (14.73 cm) Width 3.75 in. (9.54 cm)
Weight 2.2 lb (1.0 kg)
Media: 1 Platter
Number of Data Heads 4 Number of Cylinders 306 Average Access Time 105 ms
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Data Transfer Rate 5.0 Mb/s Type 1
==============================================================================
Chapter 1.5 20 Megabyte Fixed Disk Drive
Table 1-5. 20 Megabyte Fixed Disk Drive Specifications ============================================================================== Dimensions:
Height 1.7 in. (4.32 cm) Depth 4.1 in. (10.41 cm) Width 5.75 in. (14.61 cm)
Weight 1.8 lb (0.8 kg)
Media: 2 Platter
Number of Data Heads 4 Number of Cylinders 615 Average Access Time 105 ms Data Transfer Rate 5.0 Mb/s Type 2
==============================================================================
Chapter 1.6 360 KByte Diskette Drive
Table 1-6. 360 Kbyte Diskette Drive Specifications ============================================================================== Dimensions:
Height 1.1 in. (2.85 cm) Depth 7.9 in. (20.3 cm) Width 5.9 in. (15.0 cm)
Weight 1.98 lb (0.9 kg)
Media:
Tracks per inch 48 Number of Tracks 40 (when formatted with MS-DOS) Data Transfer Rate 250 Kb/s
==============================================================================
Chapter 1.7 1.2 Megabyte Diskette Drive
Table 1-7. 1.2 Megabyte Diskette Drive Specifications ============================================================================== Dimensions:
Height 1.1 in. (2.8 cm) Depth 8.0 in. (20.3 cm) Width 5.8 in. (14.6 cm)
Weight 1.9 lb (0.9 kg)
Media:
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Tracks per Inch 96 (1.2 megabyte format)
48 (360 Kbyte format)
Number of Tracks 80 (1.2 megabyte format)
40 (360 Kbyte format)
Data Transfer Rate 500 Kb/s (1.2 megabyte format)
300 Kb/s (360 Kbyte format)
==============================================================================
Chapter 1.8 1.44 Megabyte Diskette Drive Specifications
Table 1-8. 1.44 Megabyte Diskette Drive Specifications ============================================================================== Dimensions:
Height 0.90 in. (2.3 cm) Depth 6.47 in. (16.42 cm) Width 5.95 in. (11.1 cm)
Weight 1.98 lb (0.9 kg)
Media:
Tracks per Inch 135 Number of Tracks 80 Data Transfer Rate 500 Kb/s (high density)
250 Kb/s (low density)
==============================================================================
Chapter 1.9 Power Supply
Line Voltage 102 to 132 VAC. single phase
Line Frequency 47 - 62 Hz Cooling Forced air provided by internal 12 VDC fan
-----------------------------------------------------------------------------­Volts Direct Current Output
Nominal Current Continuous Peak Regulation Voltage Amperes Current Current Tolerance (VDC) Minimum (Amperes) Maximum * (Amperes) Percentage
-----------------------------------------------------------------------------­+5.0 3.0 13.9 13.9 ñ2
-5.0 0.0 0.5 0.5 ñ5 +12.2 1.0 4.0 7.0 ñ2
-12.0 0.0 0.5 0.5 ñ5
-----------------------------------------------------------------------------­* These values are maximum values based on nominal operating conditions for
temperature, line voltage, frequency and altitude. Also, a minimum load on l2 VDC must be maintained for proper power supply operation.
==============================================================================
180 to 264 VAC. single phase
3.0A fuse, 125 VAC for 120 VAC operations
2.5A fuse, 150 VAC for 220/240 VAC operation
Nominal Maximum
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Chapter 2. Power On Self Test/Problem Isolation
2.1 Power On Self Test
The Power On Self Test (POST) is a series of diagnostic tests performed automatically when the system is turned on. These tests verify that the computer system is operating properly. If a subassembly fails POST, an error code appears on the screen.
To start POST, follow these steps.
1. Turn off the computer.
2. Disconnect the signal cables of any peripheral devices (printers, modems, and so on) from the computer.
3. Remove the outer access casing to expose the system LED located on the system board (see Chapter 7 for this procedure).
4. Install a loopback plug connector at each location from which a peripheral signal cable was removed.
NOTE: To test your printer during the printer test or to log errors to a printer, reconnect the printer now.
5. Verify that the AC power cable is connected to a usable, grounded, three pronged AC power outlet.
6. Insert the DIAGNOSTICS diskette into drive A.
7. Turn on the computer. The system automatically runs POST. See Section 2.2, "System Problem Isolation," for information on handling system problems.
Chapter 2.2 System Problem Isolation
This section contains problem isolation procedures for identifying and correcting system related problems.
To isolate system problems, perform the following steps:
1. Verify that the AC power switch is on.
2. Listen for the sound of the fan. Did you hear the fan?
YES: Proceed to step 3.
NO: Turn off the computer and check the condition of the AC power fuse.
Is the fuse good?
YES: Return the AC power fuse to its fuse holder and turn on the system.
Proceed to step 3.
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NO: Replace the AC power fuse (refer to Chapter 7 in this guide
for AC power fuse removal and replacement information). Repeat steps 1 and 2.
3. Did you hear an audible beep or see an error code on the screen?
YES: See Chapter 5, "Error Messages and Codes" for information on how to
identify and correct either audible or error code related problems.
NO: Proceed to step 4.
4. Check the system LED on the system board. Is it lit?
YES: Proceed to step 5. If you did not hear the fan, replace it now.
NO: Replace the power supply subassembly chassis and repeat the problem
isolation procedures.
If the problem continues, replace the system board and repeat the problem isolation procedures.
If the problem has not been corrected, test each controller or option board by turning off the system, removing a board and turning the power back on.
If the LED is still not on, test each video and storage device by turning off the system, disconnecting the device power cable and then turning on the system.
When the system LED lights, power off the system and replace the defective subassembly.
NOTE: For removal and replacement procedures, refer to Chapter 7.
5. Check the screen for a blinking cursor. Do you see a cursor on the screen?
YES: Proceed to step 6.
NO: Listen for an audible tone (beep) from the system speaker.
If you hear one or two short beeps, POST is complete. The system now boots the DIAGNOSTICS program. If the screen remains blank, adjust the brightness knob.
If the display screen remains blank after adjusting the brightness knob, the video display unit subsystem is not functioning properly.
o If a color graphics or composite video monitor is available, connect
either device to the correct video outputs on the video display controller board. Using the CTRL + ALT + < command, change the display mode to the graphics mode.
If the first screen of the DIAGNOSTICS program appears on the external monitor, replace the internal video display unit.
If the screen on the external monitor is blank, replace the video display
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controller board.
o If a color graphics or composite video monitor is not available, replace
the video display controller board.
o If a color graphics or composite video monitor is not available and
replacing the video display controller board does not solve the problem, replace the internal video display unit.
If you do not hear a beep, replace the system board. If you hear any other audible sounds, refer to Chapter 5 for more information on POST related error messages.
6. Did the cursor disappear from the screen, replaced by the number of Kbytes (shown in increments) on the display screen?
YES: This indicates the memory self test portion of POST. Proceed to
step 7.
NO: Replace the system board. Restart the system problem isolation
procedures.
7. Did the LEDs on the mass storage device flash, followed by one or two short beeps?
YES: This indicates that POST and the SETUP utility have completed
successfully. The DIAGNOSTICS program should then boot and the DIAGNOSTICS menu should appear on the display screen.
Refer to Chapter 4 for additional information on the COMPAQ DIAGNOSTICS program.
NO: If the cursor reappears and remains on the screen, replace
the system board.
If one audible tone is heard and an error message appears, the SETUP function was not completed on the system. Press the F1 key and proceed to Chapter 3 in this guide for information on the SETUP function.
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Chapter 3. Setup
Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on SETUP.
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Chapter 4. Diagnostic Procedures
Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on DIAGNOSTICS.
Page 13
Chapter 5. Error Messages and Codes
5.0 Introduction
This section contains Power On Self Test (POST) 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, the probable cause of the error, and the action required to resolve the error condition.
Chapter 5.1 Power On Self Test Messages
An error message results if a problem is encountered during the Power On Self Test. This utility runs automatically when the system is turned on. Table 5-1 lists the message, audible (beep) message, probable cause, and the recommended action.
Table 5-1. Power On Self Test Error Messages ============================================================================== Message Beeps Probable Cause Recommended Action
------------------------------------------------------------------------------
101 - I/O ROM Error 1 Long, Option ROM 1. Inspect ROM placement.
1 Short 2. Verify correct ROM
101 - ROM Error 1 Long, System ROM 3. Replace the ROM.
1 Short
------------------------------------------------------------------------------
102 - System Board None System board The following recommended
110 - System Failure None Timer failure codes 102 through 115:
111 - System Failure None Memory refresh Replace the system board.
112 - System Failure None CMOS failure
location.
action applies to error
failure
113 - System Failure None DMA failure
114 - System Failure None Timer interrupt
115 - System Failure None Protected mode
------------------------------------------------------------------------------
Message Beeps Probable Cause Recommended Action
------------------------------------------------------------------------------
162 - System Options 2 Short SETUP utility Run SETUP Error incorrect
------------------------------------------------------------------------------
163 - Time and Date 2 Short Invalid time or Run SETUP Not Set date
------------------------------------------------------------------------------
164 - Memory Size 2 Short System Check the memory Error Discrepancy configuration configuration and run SETUP
------------------------------------------------------------------------------
failure
failure
incorrect
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XX000B YYZZ 201 - None RAM failure Refer to Section 5.3, Memory Error "Memory Related Error
Codes."
------------------------------------------------------------------------------
301 - Keyboard Error None Keyboard failure Replace the keyboard.
------------------------------------------------------------------------------
303 - Keyboard None Keyboard Replace the system board. Controller Error controller failure
------------------------------------------------------------------------------
304 - Keyboard or None Keyboard or system 1. Replace the keyboard. System Unit Error board failure 2. Replace the system
board.
------------------------------------------------------------------------------
401 - Printer None System board Replace the system board. Interface Error failure
------------------------------------------------------------------------------
402 - Monochrome 1 Long, System board or Replace the monochrome Display Controller 2 Short display controller display controller board Failure board or system board.
------------------------------------------------------------------------------
501 - Display 1 Long, Video display or Replace the video board. Controller Failure 2 Short controller board
------------------------------------------------------------------------------
Message Beeps Probable Cause Recommended Action
------------------------------------------------------------------------------
601 - Diskette None Diskette 1. Replace multipurpose Controller Error controller board controller board.
2. Replace multipurpose fixed disk drive controller board.
-----------------------------------------------------------------------------­602 - Diskette None Diskette in Drive Replace diskette. Boot Record Error A not bootable
-----------------------------------------------------------------------------­1780 - Disk 0 None Fixed disk drive/ Run DIAGNOSTICS. Failure format error
-----------------------------------------------------------------------------­1782 - Disk None Fixed disk drive/ Run DIAGNOSTICS. Controller failure controller error
-----------------------------------------------------------------------------­1790 - Disk 0 Error None Fixed disk drive Run SETUP and DIAGNOSTICS.
error or wrong drive type
-----------------------------------------------------------------------------­XX000Y ZZ Parity None Expansion RAM Run DIAGNOSTICS. Check 2
-----------------------------------------------------------------------------­Audible 1 Short Power on None
successful
-----------------------------------------------------------------------------­Audible 2 Short Power on None
successful
-----------------------------------------------------------------------------­(RESUME = "F1" KEY) None As indicated Press F1 key to continue ==============================================================================
Chapter 5.2 Diagnostics Error Codes
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DIAGNOSTICS error codes occur if the system recognizes a problem while running the DIAGNOSTICS program. These error codes help identify possible defective subassemblies.
Table 5-2 through 5-12 list possible error codes, a description of the error condition, and the action required to correct the condition.
In each case, the Recommended Action column lists steps necessary to correct the problem. After completing each step, run the DIAGNOSTICS program to verify that the error condition has been corrected. If the error code reappears, perform the next step, then run the DIAGNOSTICS program. Continue until the DIAGNOSTICS program no longer detects an error condition.
The error codes are in the form of AYY - XX or AAYY - XX, A or AA denotes the test or action that failed. XX denotes a specific problem. For example, error code 603 - 07 indicated that the diskette drive write/read/compare test failed because of a fatal error while writing.
For assistance in the removal and replacement of a particular subassembly, see Chapter 7, " Removal and Replacement Procedures."
Table 5-2. Processor Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­101 - 01 CPU test failed Replace the system board and
retest for error codes 101 - 01 through 101 - 94
-----------------------------------------------------------------------------­102 - 01 Numeric coprocessor initial The following steps apply
status word incorrect to error codes 102 - 01
through 102 - 15:
102 - 02 Numeric coprocessor initial
control word incorrect 1. Replace the numeric
coprocessor and retest.
2. Replace the system
102 - 03 Numeric coprocessor tag word board and retest.
not all ones
102 - 04 Numeric coprocessor tag word
not all zeros
102 - 05 Numeric coprocessor exchange
command failed
102 - 06 Numeric coprocessor masked
exception incorrectly handled
102 - 07 Numeric coprocessor unmasked
exception incorrectly handled
102 - 08 Numeric coprocessor wrong mask
bit set in status register
store real number
-----------------------------------------------------------------------------­Error
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Codes Error Description Recommended Action
-----------------------------------------------------------------------------­102 - 10 Numeric coprocessor real The following steps apply
number calculation test failed to error codes 102 - 01
through 102 - 15:
102 - 11 Numeric coprocessor speed test
failed 1. Replace the numeric
coprocessor and retest.
102 - 12 Numeric coprocessor pattern 2. Replace the system
test failed board and retest.
102 - 15 Numeric coprocessor inoperative
or socket unoccupied
-----------------------------------------------------------------------------­103 - 01 DMA page registers test failed Replace the system board
and retest for error codes
103 - 02 DMA byte controller test failed 103 - 01 through 113 - 01.
103 - 03 DMA word controller test failed
104 - 01 Interrupt controller master test
failed
104 - 02 Interrupt controller slave test
failed
104 - 03 Interrupt controller software RTC
inoperative
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­105 - 01 Port 61 bit 6 not at zero Replace the system board
and retest for error codes
105 - 02 Port 61 bit 5 not at zero 103 - 01 through 113 - 01.
105 - 03 Port 61 bit 3 not at zero
105 - 04 Port 61 bit 1 not at zero
105 - 05 Port 61 bit 0 not at zero
105 - 06 Port 61 bit 5 not at one
105 - 07 Port 61 bit 3 not at one
105 - 08 Port 61 bit 1 not at one
105 - 09 Port 61 bit 0 not at one
105 - 10 Port 61 I/O test failed
105 - 11 Port 61 bit 7 not at zero
105 - 12 Port 61 bit 2 not at zero
106 - 01 Keyboard controller self test failed
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107 - 01 CMOS RAM test failed
108 - 02 CMOS interrupt test failed
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­108 - 03 CMOS interrupt test, CMOS not Replace the system board
properly initialized and retest for error codes
103 - 01 through 113 - 01.
109 - 01 CMOS clock load data test failed.
109 - 02 CMOS clock rollover test failed
109 - 03 CMOS clock test, CMOS not properly
initialized
110 - 01 Programmable timer load data test
failed
110 - 02 Programmable timer 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
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­112 - 07 Speed test system error Replace the system board
and retest for error codes
112 - 08 Speed test unable to enter AUTO mode 103 - 01 through 113 - 01.
112 - 09 Speed test unable to enter HIGH mode
112 - 10 Speed test HIGH mode out of range
112 - 11 Speed test AUTO mode out of range
113 - 01 Protected mode test failed
------------------------------------------------------------------------------
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114 - 01 Speaker test failed 1. Verify speaker
connection.
2. Replace the speaker and retest.
3. Replace the system board and retest.
==============================================================================
Table 5-3. Memory Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­201 - 01 Memory machine ID test failed The following steps apply
to error codes 201 - 01
201 - 02 Memory machine type test failed through 202 - 03:
201 - 03 Memory machine ID and type tests 1. Replace VDU controller
failed board and retest.
2. Replace the system ROM
202 - 01 Memory system ROM checksum failed and retest.
3. Replace the system
202 - 02 Failed RAM/ROM map test board and retest.
202 - 03 Failed RAM/ROM protect test
-----------------------------------------------------------------------------­203 - 01 Memory write/read test failed The following steps apply
to error codes 203 -01
203 - 02 Error during saving program memory through 211 - 03:
write/read test
1. Replace the defective
203 - 03 Error during restore of program memory memory chip (or
in write/read test option memory if
installed, error
204 - 01 Memory address test failed code 208) if an error
code is accompanied
204 - 02 Error during saving program memory in by an XX000 BYYZZ
address test code and retest.
2. Replace the system
204 - 03 Error during restore of program memory memory board or the
in address test system board.
204 - 04 A20 address test failed
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
205 - 04 Insufficient memory to perform test
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­208 - 01 Memory refresh test failed The following steps apply
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to error codes 203 - 01
208 - 02 Error during saving program memory in through 211 - 03:
refresh test
1. Replace the defective
208 - 03 Error during restore program memory memory chip (or
in refresh test option memory if
installed, error code
210 - xx Incrementing pattern test failed 208) if an error code is
(expanded memory test) accompanied by an
XX000 BYYZZ code and
210 - 01 Data read from block did not match retest.
data written 2. Replace the system
memory board or the
210 - 02 Scan of test block prior to testing system board.
210 - 03 Error while restoring block under test
210 - 05 Inverted pattern compare, but RAM was
correct
210 - 06 Error while restoring block under test
210 - 07 Main memory update failure
211 - xx Random data pattern test
211 - 01 Memory random pattern test failed
211 - 02 Error during saving program memory and
random pattern in write/read test
211 - 03 Error during restore of program memory
and random pattern in write/read test
==============================================================================
Table 5-4. Keyboard Test Error Code ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­301 - 01 Keyboard short test, 8042 self test The following steps apply
failed to error codes 301 - 01
through 304 - 06:
301 - 02 Keyboard short test. interface test
failed 1. Check the keyboard
cable connector. If
301 - 03 Keyboard short test. echo test disconnected, turn
failed off computer and
connect keyboard.
301 - 04 Keyboard short test failed 2. Check internal keyboard
connections to system
302 - 01 Keyboard long test failed board.
3. Replace the keyboard
303 - 01 Keyboard LED test, 8042 self test and retest.
failed 4. Replace the system
board and retest.
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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
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­303 - 08 Keyboard LED test, command byte The following steps apply
restore test failed to error codes 301 - 01
through 304 - 06:
303 - 09 Keyboard LED test, LEDs failed to
light 1. Check the keyboard
cable connector. If
304 - 01 Keyboard typematic test failed disconnected, turn
off computer and
304 - 02 Unable to enter mode 3 connect keyboard.
2. Check internal keyboard
304 - 03 Incorrect scan code from keyboard connections to system
board.
304 - 04 No keyboard make code observed 3. Replace the keyboard
and retest.
304 - 05 Unable to disable typematic feature 4. Replace the system
board and retest.
304 - 06 Unable to return to normal mode ==============================================================================
Table 5-5. Parallel Printer Interface Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­401 - 01 Printer failed or not connected The following steps apply
402 - 01 Printer data register failed through 498 - 00:
402 - 02 Printer control register failed 1. If a printer is
402 - 03 Printer data and control register is turned on and in the
failed online mode.
402 - 04 Printer loopback failed settings on the
402 - 05 Printer loopback and data failed drive controller board
402 - 06 Printer loopback and control registers controller board (see
failed Chapter 8, "Jumper
to error codes 401 - 01
connected, be sure it
2. Check the switch
multipurpose fixed disk
or the multipurpose
Page 21
Positions and Switch
402 - 07 Printer loopback, data, and control Settings and
registers failed Adjustments").
3. Replace the printer
402 - 08 Printer interrupt test failed and/or the printer
cable and retest.
402 - 09 Printer interrupt and data register 4. Replace the multipurpose
failed fixed disk drive
controller board or the
402 - 10 Printer interrupt and control register multipurpose controller
failed board and retest.
5. Replace the system board
402 - 11 Printer interrupt, data, and control and retest.
register failed
402 - 12 Printer interrupt and loopback failed
402 - 13 Printer interrupt, loopback and data
register failed
402 - 14 Printer interrupt, loopback and control
register failed
402 - 15 Printer interrupt, loopback, data, and
control register failed
402 - 16 Printer unexpected interrupt received
403 - 01 Printer pattern test failed
498 - 00 Printer failed or not connected ==============================================================================
Table 5-6. Video Display Unit Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­501 - 01 Video controller test failed The following steps apply
to error codes 501 - 01
502 - 01 Video memory test failed through 516 - 01:
503 - 01 Video attribute test failed 1. Replace the video
display controller
504 - 01 Video character set test failed board and retest.
2. Replace the monitor and
505 - 01 Video 80 x 25 mode9x14character retest.
cell test failed 3. Check the VDU fuse on
the system board and
506 - 01 Video 80 x 25 mode8x8character retest.
cell test failed 4. Replace the system
board and retest.
507 - 01 Video 40 x 25 mode test failed
508 - 01 Video 320 x 200 mode color set 0 test
failed
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509 - 01 Video 320 x 200 mode color set 1 test
failed
510 - 01 Video 640 x 200 mode test failed
511 - 01 Video screen memory page test failed
512 - 01 Video gray scale test failed
514 - 0l Video white screen test failed
516 - 01 Video noise pattern test failed
-----------------------------------------------------------------------------­517 - 01 Lightpen text mode test failed - no The following steps apply
response to error codes 517 - 01
through 517 - 04:
517 - 02 Lightpen text mode test failed -
invalid response 1. Replace the lightpen
and retest.
517 - 03 Lightpen medium resolution mode test 2. Replace the display
failed - no response controller board
and retest.
517 - 04 Lightpen medium resolution modes test 3. Replace the system
failed - invalid response board and retest.
==============================================================================
Table 5-7. Diskette Drive Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­600 - xx Diskette ID drive types test failed The following steps apply
to error codes 600 - xx
601 - xx Diskette format failed through 614 - xx:
602 - xx Diskette read test failed NOTE: If the COMPAQ
Enhanced Color Graphics
603 - xx Diskette write/read/compare test Board is installed, check
failed the interrupt setting.
604 - xx Diskette random seek test failed 1. Replace the diskette
and retest.
605 - xx Diskette ID media failed 2. Check the switch and
jumper settings on the
606 - xx Diskette speed test failed multipurpose fixed disk
drive controller board
607 - xx Diskette wrap test failed or the multipurpose
controller board.
608 - xx Diskette write protect test failed 3. Replace the diskette
power and signal cables
609 - xx Diskette reset controller failed and retest.
4. Replace the multipurpose
610 - xx Diskette change line test failed fixed disk drive
controller board or
614 - xx Diskette drive file write test multipurpose controller
board and retest.
614 - 01 Exceeded maximum soft error limit 5. Replace the diskette
Page 23
drive and retest.
614 - 02 Exceeded maximum hard error limit 6. Replace the system
board and retest.
614 - 03 Previously exceeded maximum soft error
limit
614 - 04 Previously exceeded maximum hard error
limit
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­614 - 05 Failed to reset controller The following steps apply to
error codes 600 - xx through
614 - 06 Fatal error while reading 614 - xx:
614 - 07 Fatal error while writing NOTE: If the COMPAQ
Enhanced Color Graphics
614 - 08 Failed compare of write/read buffers Board is installed, check
the interrupt setting.
614 - 09 Failed to format a track
1. Replace the diskette and
614 - 10 Failed sector wrap test retest.
2. Check the switch and
614 - 20 Failed to get drive type jumper settings on the
multipurpose fixed disk
614 - 21 Failed to get change line status drive controller board
or the multipurpose
614 - 22 Failed to clear change line status controller board.
3. Replace the diskette
614 - 23 Failed to set drive type in ID media power and signal cables
and retest.
614 - 24 Failed to read diskette media 4. Replace the multipurpose
fixed disk drive
614 - 25 Failed to verify diskette media controller board or
multipurpose controller
614 - 26 Failed to read media in speed test board and retest.
5. Replace the diskette
614 - 27 Failed speed limits drive and retest.
6. Replace the system
614 - 28 Failed write protect test board and retest.
614 - 29 Failed to read media in file write
test
614 - 40 Cylinder 0 error
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­694 - 00 Pin 34 is not cut on 360 KB diskette See Service Bulletin 25,
drive Modification of 360 Kbyte
697 - 00 Diskette type error
698 - 00 Diskette drive speed not within and retest.
limits 2. Check the switch and
Diskette Drives.
1. Replace the diskette
jumper settings on the multipurpose fixed disk drive controller board
Page 24
or the multipurpose controller board.
3. Replace the diskette power and signal cables and retest.
4. Replace the multipurpose fixed disk drive controller board or multipurpose controller board and retest.
5. Replace the diskette drive and retest
6. Replace the system board and retest.
-----------------------------------------------------------------------------­699 - 00 Diskette drive/media ID error Rerun the SETUP program. ==============================================================================
Table 5-8. Serial Interface Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­1101 - 01 Serial port test, UART DLAB bit The following steps apply
failure to error codes 101 - 01
through 1101 - 14;
1101 - 02 Serial port test, line input or UART
fault 1. Check jumper and switch
settings on the
1101 - 03 Serial port test, address line fault serial/parallel
interface board,
1101 - 04 Serial port test, data line fault multipurpose fixed disk
drive controller board,
1101 - 05 Serial port test, UART control signal or the multipurpose
failure controller board and
retest.
1101 - 06 Serial port test, UART THRE bit 2. Replace the
failure serial/parallel
interface board,
1101 - 07 Serial port test, UART DATA READY multipurpose fixed disk
bit failure drive controller board
or multipurpose
1101 - 08 Serial port test, UART TX/RX buffer controller board and
failure retest.
1101 - 09 Serial port test, INTERRUPT circuit
failure
1101 - 10 Serial port test, COM1 set to invalid
interrupt
1101 - 11 Serial port test, COM2 set to invalid
interrupt
1101 - 12 Serial port test, DRIVER/RECEIVER
control signal failure
1101 - 13 Serial port test, UART control signal
interrupt failure
Page 25
1101 - 14 Serial port test, DRIVER/RECEIVER data
failure
-----------------------------------------------------------------------------­1102 - 58 Serial Port COM1 set to INTR 3
1102 - 60 Serial Port COM2 set to INTR 4
1102 - 64 Serial Port data compare error
1102 - 72 Serial Port no TX RDY
1102 - 88 Serial Port no RX RDY ==============================================================================
Table 5-9. Modem Communications Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­1201 - xx Modem Internal Loopback test The following apply to
error codes 120l - xx
1201 - 01 UART DLAB bit failure through 1210 - xx:
1201 - 02 Line input or UART failure 1. Refer to modem
documentation for
1201 - 03 Address line fault correct setup
procedures.
1201 - 04 Data line fault 2. Check the modem line.
3. Replace the modem and
1201 - 05 UART control signal failure retest.
1201 - 07 UART DATA READY bit failure
1201 - 08 UART TX/RX buffer failure
1201 - 09 INTERRUPT circuit failure
1201 - 10 COM1 set to invalid interrupt
1201 - 11 COM2 set to invalid interrupt
1201 - 12 DRIVER/RECEIVER control signal
failure
1201 - 13 UART control signal interrupt failure
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­1201 - 15 Modem detection failure The following apply to
error codes 120l - xx
Page 26
1201 - 16 Modem ROM, checksum failure through 1210 - xx:
1201 - 17 Tone detection failure 1. Refer to modem
documentation for
1202 - xx Modem Internal Loopback test correct setup
procedures.
1202 - 01 Timed out waiting for SYNC 2. Check the modem line.
(local loopback mode) 3. Replace the modem and
retest.
1202 - 02 Timed out waiting for modem response
(local loopback mode)
1202 - 03 Exceeded data block retry limit
(local loopback mode)
1202 - 11 Timed out waiting for SYNC
(analog loopback originate mode)
1202 - 12 Timed out waiting for modem response
(analog loopback originate mode)
1202 - 13 Exceeded data block retry limit
(analog loopback originate mode)
1202 - 21 Timed out waiting for SYNC
(analog loopback answer mode)
1202 - 22 Timed out waiting for modem response
(analog loopback answer mode)
1202 - 23 Exceeded data block retry limit
(analog loopback answer mode)
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­1203 - xx Modem External Termination test The following apply to
error codes 1201 - xx
1203 - 01 Modem external TIP/RING failure through 1210 - xx:
1203 - 02 Modem external DATA TIP/RING failure 1. Refer to modem
documentation for
1203 - 03 Modem line termination failure correct setup
procedures.
1204 - xx Modem auto originate test 2. Check the modem line.
3. Replace the modem and
1205 - xx Modem auto answer test retest.
1206 - xx Dial multifrequency tone test
1210 - xx Modem direct connect test
1210 - 01 Modem timed out waiting for SYNC
1210 - 02 Modem timed out waiting for response
1210 - 03 Modem exceeded data block retry limit
1210 - 04 RCV exceeded carrier lost limit
Page 27
1210 - 05 XMIT exceeded carrier lost limit
1210 - 06 Timed out waiting for dial tone
1210 - 07 Dial number string too long
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­1210 - 08 Modem timed out waiting for remote The following apply to
response error codes 1201 - xx
through 1210 - xx:
1210 - 09 Modem exceeded maximum redial limit
1. Refer to modem
1210 - 10 Line quality prevented remote documentation for
connection correct setup
procedures.
1210 - 11 Modem timed out waiting for remote 2. Check the modem line.
connection 3. Replace the modem and
retest.
1210 - 12 Modem timed out waiting for modem
response (analog loopback originate mode)
1210 - 13 Modem exceeded data block retry limit
(analog loopback originate mode)
1210 - 15 Modem detection failure
1210 - 16 Modem ROM, checksum failed
1210 - 17 Tone detection failure
(analog loopback answer mode)
1210 - 23 Modem exceeded data block for retry
limit (analog loopback answer mode)
==============================================================================
Table 5-10. Fixed Disk Drive Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­1700 - xx Fixed disk ID drive types test failed The following steps apply
to error codes 1700 - xx
1701 - xx Fixed disk drive format test failed through 1716 - xx.
1702 - xx Fixed disk drive read test failed 1. Check switch and jumper
settings on the fixed
1703 - xx Fixed disk drive write/read/compare disk drive controller
test failed board, multipurpose
fixed disk drive
Page 28
1704 - xx Fixed disk drive random seek test controller board, or
failed multipurpose controller
board and retest.
1705 - xx Fixed disk drive controller test 2. Replace the fixed disk
failed drive signal and power
cables and retest.
1706 - xx Fixed disk drive ready test failed 3. Replace the fixed disk
drive controller
1707 - xx Fixed disk drive recalibrate test board, multipurpose
failed fixed disk drive
controller board, or
1708 - xx Fixed disk drive format bad track multipurpose controller
test failed controller board and
retest.
1709 - xx Fixed disk drive reset controller 4. Replace the fixed disk
test failed drive and retest.
5. Replace the system
1710 - xx Fixed disk drive park head test board and retest.
failed
1714 - xx Fixed disk drive file write test
failed
1715 - xx Fixed disk drive head select test
failed
1716 - xx Fixed disk drive conditional format
test failed
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­17yy - xx Invalid fixed disk drive type failed The following steps apply
to error codes 1700 - xx
17yy - 01 Exceeded maximum soft error limit through 1716 - xx.
17yy - 02 Exceeded maximum hard error limit 1. Check switch and jumper
settings on the fixed
17yy - 03 Previously exceeded maximum soft error disk drive controller
limit board, multipurpose
fixed disk drive
17yy - 04 Previously exceeded maximum hard error controller board, or
limit multipurpose controller
board and retest.
17yy - 05 Failed to reset controller 2. Replace the fixed disk
drive signal and power
17yy - 06 Fatal error while reading cables and retest.
3. Replace the fixed disk
17yy - 07 Fatal error while writing drive controller
board, multipurpose
17yy - 08 Failed compare of write/read/compare fixed disk drive
controller board, or
17yy - 09 Failed to format a track multipurpose controller
controller board and
17yy - 10 Failed sector wrap test retest.
4. Replace the fixed disk
17yy - 19 Controller failed to deallocate bad drive and retest.
sector 5. Replace the system
board and retest.
17yy - 40 Failed cylinder 0
Page 29
17yy - 4l Drive not ready
17yy - 42 Recalibration failed
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­17yy - 43 Failed to format bad track The following steps apply
to error codes 1700 - xx
17yy - 44 Failed fixed disk drive controller through 1716 - xx:
board diagnostics
1. Check switch and jumper
17yy - 45 Failed to get drive parameters from settings on the fixed
ROM disk drive controller
board, multipurpose
17yy - 46 Invalid drive parameters found in ROM fixed disk drive
controller board, or
17yy - 47 Failed to park heads multipurpose controller
board and retest.
17yy - 48 Failed to move disk table to RAM 2. Replace the fixed disk
drive signal and power
17yy - 49 Failed to read media in file write cables and retest.
test 3. Replace the fixed disk
drive controller
17yy - 50 Failed file I/O write test board, multipurpose
fixed disk drive
17yy - 5l Failed file I/O read test controller board, or
multipurpose controller
17yy - 52 Failed file I/O compare test board and retest.
4. Replace the fixed disk drive and retest.
5. Replace the system board and retest.
17yy - 53 Failed drive/head register test
17yy - 54 Failed digital input register test
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­17yy - 55 Failed cylinder 1 test The following steps apply
to error codes 1700 - xx
17yy - 56 Fixed disk drive controller board through 1716 - xx:
RAM diagnostics failed
1. Check switch and jumper
17yy - 57 Fixed disk drive controller board settings on the fixed
to drive test failed disk drive controller
board, multipurpose
17yy - 58 Failed to write sector buffer fixed disk drive
controller board, or
17yy - 59 Failed to read sector buffer multipurpose controller
board and retest.
17yy - 60 Failed to compare sector buffer 2. Replace the fixed disk
drive signal and power
Page 30
17yy - 63 Failed soft error rate cables and retest.
3. Replace the fixed disk
17yy - 65 Exceeded maximum bad sector per track drive controller
board, multipurpose
17yy - 66 Failed initial drive parameter fixed disk drive
controller board, or
17yy - 67 Failed to write long multipurpose controller
board and retest.
17yy - 68 Failed to read long 4. Replace the fixed disk
drive and retest.
17yy - 69 Failed to read drive size from 5. Replace the system
controller board and retest.
17yy - 70 Failed translate mode
17yy - 71 Failed nontranslated mode
17yy - 72 Bad track limit exceeded
17yy - 73 Previously exceeded bad track limit ==============================================================================
Table 5-11. Enhanced Color Graphics Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
----------------------------------------------------------------------------­2402 - 01 Video memory test failed The following steps apply
to error codes 2402 - 01
2403 - 01 Video attribute test failed through 2416 - 01:
2404 - 01 Video character set test failed 1. Verify the switch
settings.
2405 - 01 Video 80 x 25 mode9x14character 2. Replace the COMPAQ
cell test failed Enhanced Color Graphics
Board ROM and retest.
2406 - 01 Video 80 x 25 mode8x8character 3. Replace the COMPAQ
cell test failed Enhanced Color Graphics
Board and retest.
2407 - 01 Video 40 x 25 mode test failed 4. Replace the system
board and retest.
2408 - 01 Video 320 x 200 mode color set 0 test
failed
2409 - 01 Video 320 x 200 mode color set 1 test
failed
2410 - 01 Video 640 x 200 mode test failed
2411 - 01 Video screen memory page test failed
2414 - 01 Video white screen test failed
2416 - 01 Video noise pattern test failed
Page 31
-----------------------------------------------------------------------------­Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­2417 - 01 Lightpen text mode failed - no The following steps apply
response to error codes 2417 - 01
through 2417 - 04:
2417 - 02 Lightpen text mode test failed -
invalid response 1. Replace the lightpen
and retest.
2417 - 03 Lightpen medium resolution mode test 2. Replace the COMPAQ
failed - no response Enhanced Color Graphics
Board ROM and retest.
2417 - 04 Lightpen medium resolution mode test 3. Replace the COMPAQ
failed - invalid response Enhanced Color Graphics
Board and retest.
4. Replace the system board and retest.
-----------------------------------------------------------------------------­2418 - 01 ECG memory test failed The following steps apply
to error codes 2418 - 01
2418 - 02 ECG shadow RAM test failed through 2425 - 01:
2419 - 01 ECG ROM checksum test failed 1. Verify switch settings.
2. Replace the COMPAQ
2420 - 01 ECG attribute test failed Enhanced Color Graphics
Board ROM.
2421 - 01 ECG 640 x 200 graphics mode test 3. Replace the COMPAQ
failed Enhanced Color Graphics
Board and retest.
2422 - 01 ECG 640 x 350 16 Color Set test 4. Replace the system
failed board and retest.
2423 - 01 ECG 640 x 350 64 Color Set test failed
2424 - 01 ECG Monochrome Text Mode test failed
2425 - 01 ECG Monochrome Graphics Mode test
failed
==============================================================================
Table 5-12. Pointing Device Interface Test Error Codes ============================================================================== Error Codes Error Description Recommended Action
-----------------------------------------------------------------------------­8601 - xx Pointing device test l. Verify switch settings
on Multipurpose
8601 - 02 Left button is inoperative Controller Board,
Multipurpose Fixed Disk
8601 - 03 Left button is stuck closed Drive Controller Board,
or Serial/Parallel
8601 - 04 Right button is inoperative Interface Board.
2. Replace the pointing
8601 - 05 Right button is stuck closed device with a working
pointing device and
8601 - 06 Left block not selected retest.
Page 32
3. Replace the
8601 - 07 Right block not selected Multipurpose Controller
Board, Multipurpose
8601 - 08 Timeout occurred Fixed Disk Drive
Controller Board, or
8601 - 10 Pointing device inoperative Serial/Parallel
Interface Board and retest.
4. Replace the system board and retest.
==============================================================================
Chapter 5.3 Memory Related Error Codes
Memory error codes result when the system detects a memory fault during the Power On Self Test or diagnostic test. The Test programs attempt to isolate the memory fault to a specific chip, then generate a memory error code that identifies the defective memory chip.
In some cases, replacing the memory chip will not solve the problem because:
o The system may not be able to accurately determine which chip or chips are
at fault.
o The problem may be caused by to a failure in the memory support circuitry,
not the memory.
The memory error code points to a specific memory address. The physical location of the memory address depends on the type of system, the number and type of memory boards installed, and the type of memory device used (64K x 1 Bit RAMs or 256K x 1 Bit RAMs).
Tables 5-14 through 5-17 identify which memory device to replace when the system shows a memory error. Table 5-13 indicates the table to reference to locate the defective chip.
Table 5-13. Memory Configurations ============================================================================== System Board Error Code Memory Device RAM Type XX Value Configuration Tables
-----------------------------------------------------------------------------­64K 00 to 02 System Board 5-14, 5-15
(0 - 256 Kbyte)
-----------------------------------------------------------------------------­10 to 26 System Memory Board 5-17 (1 - 2.5 megabyte) (512/1536 Kbyte)
------------------------------------------------------------------------------
256K 00 to 08 System Board 5-16
(0 - 640 Kbyte)
------------------------------------------------------------------------------
NOTE: XX codes 0A to 0F represent the memory space for the video memory and system ROMs. Errors in the video memory or system ROM space are not reported in the XX000B YYZZ error message format. ==============================================================================
Page 33
Defective Memory Chip Isolation Map for System Boards using 64K RAMs and 256K RAMs
Memory error codes are in the format XX000B YYZZ.
XX is the memory segment of detected error.
000 is always equal to 000 (not used)
B Byte bank location (Low: B = 0, High: B = 1)
Page 34
For example, for the Version 1 system board, memory error message "02000 10010" specifies chip U47.
Use Tables 5-14 through 5-17 to locate the defective chip and determine the required action.
NOTE: If XX or YY is not documented in the following tables, this may mean that more than one area contributed to the error condition. If this is the case, the system adds the values of the failed data bits and displays the sum in the XX or YY location.
Figures 5-1 and 5-2 show the memory chip locations for the COMPAQ PORTABLE II Personal Computer System Boards - Version 1 and 2. For information on removing and replacing memory chips contained on the system board, refer to Chapter 7 in this guide.
Table 5-14. Version 1 System Board using 64K RAMs (0 - 256 Kbytes) ============================================================================== XX = 00 (Bank 0)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
-----------------------------------------------------------------------------
00 U37 U38 Replace memory chip
01 U30 U31 Replace memory chip
02 U25 U26 Replace memory chip
04 U21 U22 Replace memory chip
08 U16 U17 Replace memory chip
10 U14 U15 Replace memory chip
20 U9 U10 Replace memory chip
40 U5 U6 Replace memory chip
80 U1 U2 Replace memory chip
------------------------------------------------------------------------------
XX = 02 (Bank 1)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U41 U42 Replace system board
01 U51 U52 Replace system board
02 U51 U52 Replace system board
04 U51 U52 Replace system board
08 U51 U52 Replace system board
Page 35
10 U46 U47 Replace system board
20 U46 U47 Replace system board
40 U46 U47 Replace system board
80 U46 U47 Replace system board ==============================================================================
Table 5-15. Version 2 System Board using 64K RAMs (0 - 256 Kbytes) ============================================================================== XX = 00 (Bank 0)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
-----------------------------------------------------------------------------
00 U32 U35 Replace memory chip
01 U24 U27 Replace memory chip
02 U17 U20 Replace memory chip
04 U9 U12 Replace memory chip
08 U41 U42 Replace memory chip
10 U33 U34 Replace memory chip
20 U25 U26 Replace memory chip
40 U18 U19 Replace memory chip
80 U10 U11 Replace memory chip
------------------------------------------------------------------------------
XX = 02 (Bank 1)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U40 U43 Replace system board
01 U31 U16 Replace system board
02 U31 U16 Replace system board
04 U31 U16 Replace system board
08 U31 U16 Replace system board
10 U23 U8 Replace system board
20 U23 U8 Replace system board
40 U23 U8 Replace system board
80 U23 U8 Replace system board ==============================================================================
Table 5-16. Version 1 System Board using 256K RAMs (0 - 640 Kbytes)
Page 36
============================================================================== XX = 00, 02, 04, 06 (Bank 0)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U37 U38 Replace memory chip
01 U30 U31 Replace memory chip
02 U25 U26 Replace memory chip
04 U21 U22 Replace memory chip
08 U16 U17 Replace memory chip
10 U14 U15 Replace memory chip
20 U9 U10 Replace memory chip
40 U5 U6 Replace memory chip
80 U1 U2 Replace memory chip
------------------------------------------------------------------------------
XX = 08 (Bank 1)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U41 U42 Replace system board
01 U51 U52 Replace system board
02 U51 U52 Replace system board
04 U51 U52 Replace system board
08 U51 U52 Replace system board
10 U46 U47 Replace system board
20 U46 U47 Replace system board
40 U46 U47 Replace system board
80 U46 U47 Replace system board ==============================================================================
Table 5-17. Version 2 System Board using 256K RAMs (0 - 640 Kbytes) ============================================================================== XX = 00, 02, 04, 06 (Bank 0)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U32 U35 Replace memory chip
01 U24 U27 Replace memory chip
02 U17 U20 Replace memory chip
Page 37
04 U9 U12 Replace memory chip
08 U41 U42 Replace memory chip
10 U33 U34 Replace memory chip
20 U25 U26 Replace memory chip
40 U18 U19 Replace memory chip
80 U10 U11 Replace memory chip
------------------------------------------------------------------------------
XX = 08 (Bank 1)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U40 U43 Replace system board
01 U31 U16 Replace system board
02 U31 U16 Replace system board
04 U31 U16 Replace system board
08 U31 U16 Replace system board
10 U23 U8 Replace system board
20 U23 U8 Replace system board
40 U23 U8 Replace system board
80 U23 U8 Replace system board ==============================================================================
Defective Memory Chip Isolation Map for the 512/1536 Kbyte System Memory Board Mapped into the 1 to 2.5 Megabyte Memory Space (256K x 1 Bit RAMs)
NOTE: This isolation map is valid for a system memory board that uses 256K x 1 bit RAMs.
Memory error codes are in the format XX000B YYZZ.
XX equals the 128 Kbyte memory segment where an error is detected.
000 is always equal to 000 (not used).
B Byte bank location (Low:B=0,High: B = 1)
ZZ Bit location of the high byte (B = 1)
Use the following table to locate the defective memory chip and the required action. Figure 5-3 shows the memory chip locations for the COMPAQ PORTABLE II Personal Computer System Memory Board (512/1536 Kbyte). For information on removing and replacing memory chips contained on this board,
Page 38
refer to Chapter 7.
Table 5-18. Memory Locations/Required Action for 512/1536 Kbyte System Memory Board Mapped to the 1 to 2.5 Megabyte Memory Space (256K x 1 Bit RAMs) ============================================================================== XX = 10, 12, 14, 16 (Bank 2)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U47 U23 Replace system memory board
01 U31 U7 Replace system memory board
02 U32 U8 Replace system memory board
04 U54 U51 Replace system memory board
08 U39 U15 Replace system memory board
10 U40 U16 Replace system memory board
20 U53 U50 Replace system memory board
40 U48 U24 Replace system memory board
80 U52 U49 Replace system memory board
------------------------------------------------------------------------------
XX = 18, 1A, 1C, 1E, (Bank 3)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U44 U20 Replace memory chip
Page 39
01 U28 U4 Replace memory chip
02 U29 U5 Replace memory chip
04 U30 U6 Replace memory chip
08 U36 U12 Replace memory chip
10 U37 U13 Replace memory chip
20 U38 U14 Replace memory chip
40 U45 U21 Replace memory chip
80 U46 U22 Replace memory chip
------------------------------------------------------------------------------
XX = 20, 22, 24, 26 (Bank 4)
------------------------------------------------------------------------------
Data Bit B = 0 B = 1 YY or ZZ Low High Required Action
------------------------------------------------------------------------------
00 U41 U17 Replace memory chip
01 U25 U1 Replace memory chip
02 U26 U2 Replace memory chip
04 U27 U3 Replace memory chip
08 U33 U9 Replace memory chip
10 U34 U10 Replace memory chip
20 U35 U11 Replace memory chip
40 U42 U18 Replace memory chip
80 U43 U19 Replace memory chip ==============================================================================
Page 40
Chapter 6. Illustrated Parts Catalog
6.0 Introduction
This section provides a spare parts reference for the COMPAQ PORTABLE II Personal Computer.
Each table in this section contains the following information:
o Item - reference number keyed to an illustration.
o Part Number - to be used when ordering parts from Compaq Computer
Corporation.
o Description - name of the particular part or parts kit.
NOTE: When several parts have the same part number, the parts are available only as part of a kit.
Chapter 6.1 Compaq Portable II Personal Computer
Table 6-1. COMPAQ PORTABLE II Personal Computer ============================================================================== Item Part Number Description
------------------------------------------------------------------------------
1 107899-001 ** Chassis Cover
2 104179-001 ** Keyboard Assembly
Page 41
107678-001 Spanish Enhanced Keyboard
Assembly
---------------------------------------------------------------------------
** Part number no longer available. ==============================================================================
Chapter 6.2 Chassis
Table 6-2. COMPAQ PORTABLE II Personal Computer Chassis ============================================================================== Item Part Number Description
------------------------------------------------------------------------------
1 107899-001 ** Chassis Cover
2 104081-001 ** Chassis Assembly
3 104198-001 ** Front Bezel
4 104059-001 ** Drive Bezel
5 104050-001 Blank Drive Bezel (third height)
6 * Brightness Knob Assembly
7 101155-001 AC Power Cord
8 102930-001 3-A AC Line Fuse (Quantity = 40)
100228-002 ** 3-A AC Line Fuse (Quantity = 1)
------------------------------------------------------------------------------
* Contained in the Miscellaneous Hardware Kit (Spare PN 104270-001 **).
See Table 6-7.
Page 42
** Part number no longer available. ==============================================================================
Chapter 6.3 Common Chassis
Table 6-3. COMPAQ PORTABLE II Personal Computer Common Chassis ============================================================================== Item Part Number Description
Page 43
------------------------------------------------------------------------------
1 104180-001 ** Power Supply Chassis
2 104178-001 ** Fan Assembly
3 104273-001 ** Automatic Power Switching (APS) Board
4 106886-001 Serial/Parallel Interface Board
5 104174-001 Multipurpose Fixed Disk Drive Controller Board
102705-001 ** Multipurpose Controller Board
6 109196-001 ** Enhanced Color Graphics Board
106686-001 Enhanced Color Graphics ROM
7 101340-001 ** Video Display Controller Board
8 105033-001 ** 512/2048 Kbyte Memory Expansion Board
9 100025-001 ** Handle
10 104067-001 ** Handle Underlay
11 112693-001
(replaced by 197458-001) 2400 Baud Internal Modem
12 104081-001 ** Chassis Assembly
13 * Torx 6-32 x 3/8 Screw
14 104185-001 ** Speaker/Brightness Potentiometer Assembly
15 * Brightness Knob
------------------------------------------------------------------------------
* Contained in the Miscellaneous Hardware Kit (Spare PN 104270-001 **).
See Table 6-7.
** Part number no longer available.
------------------------------------------------------------------------------
Item Part Number Description
------------------------------------------------------------------------------
16 104183-001 ** 10 Megabyte Fixed Disk Drive
104405-001 *** 20 Megabyte Fixed Disk Drive
17 104093-001 ** Fixed Disk Drive Signal Cable
18 104182-001 ** Monitor Assembly
19 104007-001 ** Video Display Signal Cable
20 * Brightness Knob
21 104081-001 ** Chassis Assembly
22 104175-001 ** System Board (Assy No. 000318)
104444-001 ** System Board (Assy No. 000324)
Page 44
23 104176-001 ** 512/1536 Kbyte System Memory Board
24 104186-001 ** Battery
25 104008-002 ** Diskette Drive Signal Cable
26 104185-001 ** Speaker/Brightness Potentiometer Assembly
27 * Drive Shoulder Bolt
28 * Vibration Isolators
29 104048-001 ** Storage Device Enclosure
------------------------------------------------------------------------------
* Contained in the Miscellaneous Hardware Kit (Spare PN 104270-001 **).
See Table 6-7.
Contained in the Cable Kit, Spare PN 104191-001 **.
See Table 6-6.
** Part number no longer available.
*** Part number 104405-001 was replaced by 142365-001.
------------------------------------------------------------------------------
Item Part Number Description
------------------------------------------------------------------------------
30 104092-002 ** Mass Storage Power Cable (Fixed Disk Drive)
104006-001 ** Mass Storage Power Cable (Diskette Drive) 101741-001 Mass Storage Power Cable (Diskette Drive C, 6 Inch)
31 104184-001 ** 360 Kbyte (flip door) Diskette Drive ‰
107360-001 360 Kbyte (push button) Diskette Drive 104479-001 ** 1.2 Megabyte (flip door) Diskette Drive 107359-001 1.2 Megabyte (push button) Diskette Drive 109595-001 1.44 Megabyte Diskette Drive ****
106558-001 Weitek 287 Coprocessor (8 MHz)
105151-001 ** 150 ns DRAM Chips (256K x 1) 105152-001 ** 150 ns DRAM Chips (64K x 1) 105035-001 System ROM
------------------------------------------------------------------------------
Contained in the Cable Kit, Spare PN 104191-001 **. See Table 6-6.
‰ When replacing a flip door style diskette drive with a push button
style diskette drive, order a replacement drive bezel (PN 104059-001 **) for a better fit.
**** Requires system ROM N3 or later for use with MS-DOS and ROM P.1 or later
for use with MS OS/2 Version 1.1. Requires MS-DOS Version 3.31 Revision A if installed as Drive B, and MS-DOS Version 3.31 Revision B if installed as Drive A.
** Part number no longer available. ==============================================================================
Page 45
Chapter 6.4 Mechanical Chassis
Table 6-4. COMPAQ PORTABLE II Personal Computer Mechanical Chassis ============================================================================== Item Part Number Description
------------------------------------------------------------------------------
1 104052-001 ** High Voltage Device Access Plate
2 104079-001 ** Mass Storage Device Access Plate
3 * Torx 4-40 x 1/4 Screw
4 130770-001 ** Board Slots Access Plate
5 104081-001 ** Chassis Assembly
6 104098-001 ** Memory Expansion Access Plate
7 104099-001 ** Cable Tray Access Plate
------------------------------------------------------------------------------
* Contained in Miscellaneous Hardware Kit, Spare PN 104270-001 **.
** Part number no longer available. ==============================================================================
Chapter 6.5 Monitor
Page 46
Table 6-5. COMPAQ PORTABLE II Personal Computer Monitor ============================================================================== Item Part Number Description
------------------------------------------------------------------------------
1 104182-001
(No longer available) Monitor Assembly
2 104007-001 *
(No longer available) Video Display Signal Cable
3 ** Mounting Screws (4)
4 106568-001 Color Monitor (external)
------------------------------------------------------------------------------
* Included in the Cable Kit. See Table 6.6. ** Included in the Miscellaneous Hardware Kit, Spare PN 104270-001 (No
longer available). Refer to Table 6-7.
==============================================================================
Chapter 6.6 Cable Kit
Table 6-6. COMPAQ PORTABLE II Personal Computer Cable Kit (PN 104191-001 (No longer available)) ============================================================================== Description Quantity
------------------------------------------------------------------------------
1. Diskette Drive Power Cable 1
2. Video Display Signal Cable 1
Page 47
3. Fixed Disk Drive Controller Signal Cable 1
4. Speaker/Potentiometer Cable 1
5. Diskette Drive Signal Cable 1
6. Fixed Disk Drive Power Cable 1
==============================================================================
Chapter 6.7 Miscellaneous Hardware Kit
Table 6-7. COMPAQ PORTABLE II Personal Computer Miscellaneous Hardware Kit (PN 104270-001 (No longer available)) ============================================================================== Description Quantity
------------------------------------------------------------------------------
Monitor/Drive Enclosure Screw 25
Screw Covers 25
Drive Shoulder Bolt 10
Drive Vibration Isolators 5
Ty-Wrap, 3/4 in. wide, 3 7/8 in. long, #18 100
PCB Board Guide 5
Fixed Disk Drive LED Cable 2
Brightness Knob 5
PCB Board Retainers 2
Push Mount Fasteners 5
Fan Well Nuts 5
High Voltage Monitor Grommet 2
System Board Connector Grommet 5
Keyboard Rubber Foot 10
Option Board Locking Standoffs 5
Monitor Sweep Board Standoffs 5
T-15 8/32 x 5/16 Screw 10
6-32 x 9/16 Screw 10
Power Grommet 2 ==============================================================================
Page 48
Chapter 7. Removal and Replacement Procedures
7.1 Preparation
Before beginning the procedures in this section, complete the following steps:
1. Turn off the computer.
2. Close the keyboard and secure it by sliding the latches to the LOCK
position (Figure 7-1) and folding the keyboard feet in place.
3. Disconnect any peripheral devices (printers, monitors, and so on) from the
computer.
4. Disconnect the AC power cord from the AC outlet and from the computer
(Figure 7-2).
Page 49
Chapter 7.2 AC Power Fuse
To remove the AC power fuse, complete the following steps:
1. Complete the preparation procedures (see Section 7.1).
2. Slide open the AC power compartment to expose the line filter ON/OFF
switch (Figure 7-3).
Page 50
3. Insert a flat bladed screwdriver along the bottom edge of the fuse box.
Lift outward with enough pressure to force the fuse box out of the casing (Figure 7-4).
4. When the fuse box is removed, locate the spare fuse provided in the
holding area in the fuse box (Figure 7-5). Lift the fuse out and replace it with the spare fuse.
5. Slide the fuse box back into place. Press the cover in until you feel it
snap into place.
NOTE: Use only a fuse with a 3 Ampere current rating.
Page 51
Chapter 7.3 Outer Access Casing
To remove the outer access casing from the computer, complete the following steps:
1. Complete the preparation procedure (see Section 7.1).
2. Place the computer keyboard side down on a level work surface. Slide open
the AC power access panel and the peripheral connector access panels. Using a Torx screwdriver, remove the mounting screws from the AC power and peripheral connector access areas (Figures 7-6 and 7-7).
Page 52
3. Remove the outer access casing by grasping it close to the AC power and
peripheral connector access panels and sliding the cover towards you. Slide it completely off the system chassis (Figure 7-8) and set it aside.
NOTE: The outer access casing is flexible and will bend as needed.
Page 53
To replace the outer access casing, reverse steps 2 and 3.
Chapter 7.4 Keyboard Assembly
To remove the keyboard assembly, complete the following steps:
1. Remove the cable tray access plate (see Section 7.13).
2. Disconnect the keyboard cable connector from the J116 socket connector on
the system board (Figure 7-9).
Page 54
3. Lower the rear portion of the computer so that it rests flatly against the
work surface (Figure 7-10).
4. Unlock the keyboard latches and gently slide the keyboard cable from
inside the computer system chassis (Figure 7-11). Remove the keyboard from the computer system chassis.
Page 55
To replace the keyboard assembly, reverse steps 1 through 4.
Chapter 7.5 Front Bezel
To remove the front bezel, complete the following steps:
1. Remove the keyboard assembly (see Section 7.4).
2. Remove the brightness control knob by gently pulling it from the front
bezel (Figure 7-12).
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3. Lift the rear portion of the computer so that it rests firmly on the front
bezel (Figure 7-13).
4. Using a Torx screwdriver, remove the six screws that secure the front
bezel to the system chassis (Figure 7-14).
Page 57
5. Lower the system chassis and gently pull the front bezel from the system
chassis (Figure 7-15).
To replace the front bezel, reverse steps 1 through 5.
Chapter 7.6 Power Supply Subassembly Chassis
The power supply subassembly chassis consists of the following assemblies:
Page 58
o Line filter ON/OFF switch assembly o Power supply assembly board o Power supply insulating paper
To remove the power supply subassembly chassis, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
2. Place the computer on its side (see Figure 7-16).
3. Using a Torx screwdriver, loosen (DO NOT REMOVE) the nine mounting screws
that secure the power supply chassis to the system chassis (Figure 7-17).
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4. Remove only the two screws indicated in Figure 7-18.
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5. Remove the power supply subassembly chassis by lifting the rear portion of
the chassis upward. As this end is raised, lift the front portion of the chassis until the entire power supply chassis is free of the system chassis (Figure 7-19).
NOTE: Because the power supply connects directly to the system board, be careful when removing the power supply subassembly chassis.
6. To completely remove the power supply subassembly chassis from the
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computer system chassis, disconnect the fan assembly and the automatic power switching board (Figure 7-20).
7. Gently lift and remove the power supply subassembly from the system
chassis.
To replace the power supply subassembly chassis, reverse steps 1 through 6.
Chapter 7.7 Fan Assembly
To remove the fan assembly, complete the following steps:
1. Remove the power supply subassembly chassis (see Section 7.6).
2. Cut the two cable ties that secure the fan assembly power cable to the
system chassis.
3. Using a Phillips screwdriver, remove the two mounting screws and lift the
fan assembly from the system chassis (Figure 7-21).
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To replace the fan assembly, reverse steps 1 through 3.
Chapter 7.8 Automatic Power Switching Board (APS)
1. Remove the power supply subassembly chassis (see Section 7.6).
NOTE: Carefully remove all three connections to the APS board when removing the power supply chassis. Refer to Figure 7-22 for an illustration of the APS board.
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2. To remove the APS board, which is secured to the system chassis by four
PCB standoffs, press the top of each PCB standoff together, one at a time. At the same time, carefully lift that portion of the APS board from the system chassis.
Repeat this procedure until all board standoffs have been disconnected from the APS board, then lift and remove the APS board from the system chassis (Figure 7-23).
To replace the APS Board, complete the following steps:
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1. Slide the APS Board into place on the system
2. Press the four PCB standoffs into the holes in the board.
3. Hold the power supply subassembly at a 30 to 45 degree angle as shown in
Figure 7-24, and tie the three wire harnesses together with a ty-wrap.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
CAUTION
When reassembling the APS board, be sure to reconnect the fan. Do not "pinch" the harness wires between the power supply subassembly and the chassis; this could interfere with the cooling system and result in overheating.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
4. Reinstall the power supply subassembly chassis (see Section 7-6).
Chapter 7.9 High Voltage Access Plate
The high voltage access plate is located just above the video monitor and power supply assemblies.
To remove the high voltage access plate, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
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2. Using a Torx screwdriver, loosen (DO NOT REMOVE) the 11 mounting screws
that secure the high voltage monitor access plate to the system chassis. Remove only the three mounting screws indicated in Figure 7-25.
3. Gently slide the high voltage access plate towards the power supply
chassis assembly and lift it up and away from the system chassis.
To replace the high voltage access plate, reverse steps 1 through 3.
Chapter 7.10 Board Slots Access Plate
The board slots access plate is located at the rear of the computer and covers all installed controller and option boards.
To remove the board slots access plate, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
2. Using a Torx screwdriver, loosen (DO NOT REMOVE) the seven mounting screws
that secure the board slots access plate to the system chassis. Remove only the one screw indicated in Figure 7-26.
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3. Gently slide the board slots access plate to the right of the computer and
lift it up and away from the system chassis.
To replace the board slots access plate, reverse steps 1 through 3.
Chapter 7.11 Mass Storage Device Access Plate
The mass storage device access plate is located at the front of the system chassis and covers all installed mass storage devices.
To remove the mass storage device access plate, complete the following steps:
1. Remove the outer access cover (See Section 7.3).
NOTE: It is not necessary to remove the mass storage device access plate before removing the mass storage device enclosure.
2. Using a Torx screwdriver, remove the eight mounting screws that secure the
mass storage device access plate to the system chassis and the mass storage device enclosure (Figure 7-27).
Page 67
3. Carefully lift the mass storage device access plate away from the system
chassis.
To replace the mass storage device access plate, reverse steps 1 through 3.
Chapter 7.12 System Memory Board Access Plate
To remove the system memory board access plate, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
2. Turn over the system chassis as illustrated in Figure 7-28.
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3. Using a Torx screwdriver, loosen (DO NOT REMOVE) the seven mounting screws
that secure the system memory board access plate to the system chassis. Remove only the one mounting screw indicated in Figure 7-29.
4. Carefully lift and remove the system memory board access plate from the
system chassis (Figure 7-29).
To replace the system memory board access plate, reverse steps 1 through 4.
Page 69
Chapter 7.13 Cable Tray Access Plate
To remove the cable tray access plate, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
2. Remove the system memory board access plate (see Section 7.12).
3. Turn over the system chassis as illustrated in Figure 7-30.
4. Using a Torx screwdriver, loosen (DO NOT REMOVE) the seven Torx screws
that secure the cable tray access plate to the system chassis. Remove only the two mounting screws noted in Figure 7-31.
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5. Carefully lift and remove the cable tray access plate from the system
chassis.
To replace the cable tray access plate, reverse steps 1 through 5.
Chapter 7.14 Multipurpose Controller Board
The Multipurpose Controller Board is located in slot J104 on the system board (Figure 7-32). To remove the multipurpose controller board, complete the following steps.
Page 71
1. Remove the board slots access plate (see Section 7.10).
2. Disconnect the mass storage device signal cable(s) as shown in
Figure 7-33.
NOTE: If a fixed disk drive is installed in the system chassis, you must disconnect two signal cables.
3. Using a Torx screwdriver, remove the board retaining screw. Carefully
Page 72
lift the controller board up and out of the system board (Figure 7-34).
To replace the Multipurpose Controller Board, reverse steps 1 through 3.
Chapter 7.15 Video Display Controller Board
The Video Display Controller Board is located in slot J103 on the system board (Figure 7-35).
Page 73
To remove the Video Display Controller Board, complete the following steps:
1. Remove the board slots access plate (see Section 7.10).
2. Remove the retaining screw that secures the Video Display Controller
Board. Then disconnect the video display signal cable (Figure 7-36).
3. Carefully lift the board up and out of its J103 connector location on the
system board (Figure 7-37).
Page 74
To replace the Video Display Controller Board, reverse steps 1 through 3.
Chapter 7.16 512/2048 KByte Memory Expansion Board
The COMPAQ PORTABLE II Personal Computer may contain up to two option boards. Option boards are always installed in the back two slots of the system chassis. To remove a COMPAQ 512/2048 Kbyte Memory Expansion Board or any other option board installed in the computer, complete the following steps:
1. Remove the outer access casing (See Section 7.3).
2. Disconnect any signal cables connected to the board.
3. Remove the retaining screw that secures the board to the system chassis.
4. Carefully lift the board up and out of its connector on the system board
(Figure 7-38).
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To replace the 512/2048 Kbyte Memory Expansion Board or other option boards, reverse steps 1 through 4.
Chapter 7.17 Handle
To remove the handle from the computer, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
2. Remove the board slots access plate (see Section 7.10).
3. Remove all controller and option boards installed (see Sections 7.14
through 7.16).
4. Using a Torx screwdriver, remove the two mounting screws that secure the
handle to the system chassis, and remove the handle system chassis (Figure 7-39).
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To replace the handle, reverse steps 1 through 4.
Chapter 7.18 System Board
There are two versions of the system board for the COMPAQ PORTABLE II: version 1 (Assy No. 000318) and version 2 (Assy No. 000324). The two system boards differ in shape, memory chip locations, and jumper locations (Figures 7-40 and 7-41).
Functionally both versions are identical; however, the version 2 system board contains three gate array devices that consolidate the functions of several devices from the earlier version making a smaller system board possible.
Page 77
To remove either system board, complete the following steps:
1. Remove the power supply subassembly chassis (see Section 7.6).
2. Remove the board slots access plate (see Section 7.10).
3. Remove all controller and option boards installed (see Sections 7.14
through 7.16).
4. Using Figure 7-42 as a reference, disconnect the mass storage
device power cable.
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5. Remove the system memory board access plate (see Section 7.12).
6. Remove the cable tray access plate (see Section 7.13).
7. Using Figure 7-43 as a reference, disconnect the keyboard power cable,
the video display unit power cable, and the speaker/brightness control cable.
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8. Using a Torx screwdriver, remove the eight mounting screws that secure
the system board to the system chassis.
9. Carefully lift the system board from the System chassis (Figure 7-44).
To replace the system board, reverse steps 1 through 9.
If replacing a Version 1 board with a Version 2 board, the speaker/brightness potentiometer assembly (PN 104185-001 no longer available) should be replaced with an assembly containing a longer wiring harness. Spare part kits containing version 2 boards include a speaker/brightness potentiometer assembly.
NOTE: Be sure to pay special attention to the system board guide/clamp at the rear of the chassis.
Chapter 7.19 Battery
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
The lithium battery may explode if mishandled or stored improperly. Do not abuse, disassemble, or incinerate. Use only replacement batteries supplied by Compaq Computer Corporation (PN 104186-001).
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
WARNING
To remove the battery, complete the following steps:
Page 80
1. Remove the 512/1536 Kbyte System Memory Board access plate (see
Section 7.12).
2. The battery is secured to the bottom of the system board by a snap in
connector and cable tie. Remove the battery by first cutting the cable tie then lifting the battery from its snap in connector (Figure 7-45).
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
CAUTION
Make sure the polarity is correct when replacing the battery. Improper installation of the battery can cause damage to the computer.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
To replace the battery, complete the following steps:
1. Replace the battery in the snap in connector.
2. Replace the cable tie.
3. Replace the 512/1536 Kbyte System Memory Board access plate (see
Section 7.12).
Chapter 7.20 512/1536 KByte System Memory Board
To remove the 512/1536 Kbyte System Memory Board, complete the following
Page 81
steps:
1. Remove the outer access casing (see Section 7.3).
2. Remove the Memory Expansion Board access plate (see Section 7.12).
3. The memory board is secured to the system board by six PCB standoffs. To
remove the memory board from the system board, press the top of each PCB stand off together, one at a time. At the same time, gently lift that portion of the memory board from the stand off. Repeat this procedure until all PCB standoffs have been disconnected from the system memory board.
4. Lift the disconnected memory board from the system board (Figure 7-46).
To replace the memory board, reverse steps 1 through 4.
Chapter 7.21 Memory Option
COMPAQ PORTABLE II Personal Computer memory chips can be installed on the system board, the 512/2048 Kbyte Memory Expansion Board, or the 512/1536 Kbyte System Memory Board.
To remove a memory chip, complete the following steps:
1. Remove the board that contains the memory chip to be replaced. For board
removal procedures, refer to one of the following sections.
o For the 512/2048 Kbyte Memory Expansion Board removal and replacement
procedure refer to Section 7.16.
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o For the system board removal and replacement procedure refer to
Section 7.18.
o For the 512/1536 Kbyte System Memory Board removal and replacement
procedure, refer to Section 7.20.
NOTE: The RAM and ROM chip locations on the system boards differ from those on the memory boards (See Figures 7-47 through 7-50).
Page 83
Page 84
2. Using an IC removal tool, remove the defective RAM or ROM chip(s)
(Figure 7-51).
3. Using a special IC insertion tool, replace the defective RAM or ROM
chip(s) (Figure 7-52).
Page 85
4. Replace the memory board.
NOTE: After replacing the defective component, run DIAGNOSTICS to verify proper operation of the computer. (Please consult the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for current information on DIAGNOSTICS.)
Chapter 7.22 Mass Storage Device Subassembly
Mass storage device subassemblies for the COMPAQ PORTABLE II Personal Computer consist of fixed disk drives and diskette drives. Refer to Figure 7-53 for the location of each type of mass storage device subassembly.
Page 86
Mass Storage Device Subassembly Enclosure
To remove the mass storage device subassembly enclosure, complete the following steps:
1. Remove the outer access casing (see Section 7.3).
2. Remove all installed controller and option boards (see
Sections 7.14 through 7.16).
3. Using a screwdriver, gently pry the drive bezel from the front bezel
(Figure 7-54). This exposes the installed mass storage devices.
Page 87
4. Using a Torx screwdriver, remove the two screws on the right side of the
system chassis and the four screws on the top of the mass storage device enclosure. These screws secure the mass storage device subassembly enclosure to the system chassis (Figure 7-55).
5. Slide the mass storage device subassembly enclosure forward a few inches
by reaching into the open system chassis area and pushing the enclosure forward. This action will expose the mass storage power cables (Figure 7-56).
Page 88
6. Disconnect the diskette drive and fixed disk drive power cable from the
system board (Figure 7-57).
7. Grasp the sides of the mass storage device subassembly enclosure firmly
and slide the enclosure out of the system chassis (Figure 7-58).
Page 89
To replace the mass storage device subassembly enclosure, reverse steps 1 through 7.
Fixed Disk Drive
To remove the fixed disk drive assembly:
1. Remove the mass storage device subassembly enclosure (see
Section 7.22).
2. Using a Torx screwdriver, remove the two shoulder bolts and vibration
isolators from either side of the mass storage device subassembly enclosure. Slide the fixed disk drive assembly enclosure out of the mass storage device subassembly (Figure 7-59).
Page 90
NOTE: The fixed disk drive is mounted above the diskette drive.
To replace the fixed disk drive assembly, reverse steps 1 and 2.
Diskette Drive
To remove the diskette drive assembly, complete the following steps:
1. Remove the mass storage device subassembly enclosure (see
Section 7.22).
2. Using a Torx screwdriver, remove the two shoulder bolts that secure the
diskette disk drive assembly from either side of the mass storage device subassembly enclosure (Figure 7-60).
3. Slide the diskette drive assembly out of the mass storage device
subassembly enclosure (Figure 7-60).
Page 91
NOTE: When removing the diskette drive, make sure the vibration isolators are not lost. You need to reinstall all four isolators when replacing the diskette drive assembly.
To replace the diskette drive assembly, reverse steps 1 through 3.
NOTE: When replacing a flip door style diskette drive with a push button style diskette drive, you should also order a replacement drive bezel (PN 104059-001 (No longer available)) to provide a better fit for the new diskette drive assembly.
Chapter 7.23 Speaker and Brightness Potentiometer
To remove the speaker and brightness potentiometer:
1. Remove the cable tray access plate (see Section 7.13).
2. Remove the mass store device enclosure (see Section 7.22).
3. Remove the front bezel (see Section 7.5).
4. The speaker is secured to the system chassis by a snap in mount and a
toe in mount that extend through the system chassis. Remove the speaker by first disconnecting the speaker/brightness control connector from the J114 position on the system board, then pressing the snap in mount inward. At the same time, push the speaker out of the system chassis (Figure 7-61).
Page 92
5. Remove the brightness potentiometer by first unscrewing the nut that
secures it to the system chassis, then push the brightness potentiometer out of the system chassis (Figure 7-62).
To replace the speaker and the brightness potentiometer, reverse steps 1 through 5.
Chapter 7.24 Video Display Unit
Page 93
To remove the video display unit (VDU), complete the following steps:
1. Remove the keyboard assembly (see Section 7.4).
2. Disconnect the VDU power cable (Figure 7-63).
3. Lower the computer so that it appears as illustrated Figure 7-64.
Page 94
4. Remove the high voltage access plate (see Section 7.9).
5. Remove the front bezel (see Section 7.5)
6. Disconnect the VDU signal cable from the VDU (Figure 7-65).
7. The VDU high voltage cable is secured to the system chassis by a
push mount with a snap connector at the end. Disconnect the VDU high voltage cable by first unsnapping the push mount and then removing the cable from its place inside the connector (Figure 7-66).
Page 95
8. The VDU sweep board is secured to the system chassis by five PCB stand off
mounts and one screw. Using a Torx screwdriver, remove the grounding screw in the upper left corner of the VDU sweep board. To remove the VDU sweep, grasp the board and gently slide it upward until the standoffs clear the mounting holes. Once the VDU sweep board clears all standoffs, slide the board out of the mounting holes and let it come to rest on the side of the VDU (Figure 7-67).
9. Remove the four screws from the front of the video display unit (Figure 7-68).
Page 96
10. Remove the VDU from the system chassis by grasping the display screen and
the VDU sweep board and then sliding the unit until it is out of the system chassis (Figure 7-69).
If replacement is necessary, this unit may be shipped back to Compaq Computer Corporation packed only in a Compaq Spare VDU box.
Page 97
To replace the video display unit, reverse steps 1 through 10.
NOTE: When replacing the VDU assembly, replace the two top front mounting screws first. This helps align the screen correctly.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
CAUTION
The video display unit is fragile; be careful when handling it. Be careful not to disturb the VDU adjustment potentiometers on the VDU sweep board and not to break the display tube.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Page 98
Chapter 8. Jumper Settings, Switch Settings, and Adjustments
8.1 System Board Jumper Settings
Figure 8-1 shows the jumper locations on the COMPAQ PORTABLE II Version 1 system board. Refer to Table 8-1 when setting the jumpers on this board.
Figure 8-2 shows the jumper locations on the COMPAQ PORTABLE II Version 2 system board. Refer to Table 8-1 when setting the jumpers on this board.
Page 99
Table 8-1. System Board Jumper Settings ============================================================================== Jumper Jumper Location Function Setting
------------------------------------------------------------------------------
ED Video Display Pins 1-2 Third party monochrome monitor
Unit selection (MDA) installed
Pins 2-3 COMPAQ VDU, EGA, or RGBI installed
(default)
------------------------------------------------------------------------------
ES Speed selection Pins 1-2 Primary or fast speed, 8 MHz
(default)
Pins 2-3 Secondary or common speed, 6 MHz
------------------------------------------------------------------------------
EM Reserved DO NOT CHANGE SETTINGS
------------------------------------------------------------------------------
MS1, MS2 System board MS1 = G disable memory and ROM
memory selection MS2 = G
MS1 = V 256 Kbyte memory installed MS2=G
MS1 = G 512 Kbyte memory installed MS2=V
MS1 = V 640 Kbyte memory installed (default) MS2=V
------------------------------------------------------------------------------
MS3 Memory Board MS3 = 1.0 1 Megabyte memory recognized
or V
512/1536 Kbyte MS3 = 1.5 1.5 Megabytes memory recognized memory selection or G (default)
==============================================================================
Chapter 8.2 512/2048 KByte Memory Expansion Board Jumper Settings
The jumper settings on the 512/2048 Kbyte Memory Expansion Board correspond to the amount of random access memory installed in the four banks on the option board. There are four possible memory configurations that expand the memory address range from 1.0 megabyte to 3.0 megabytes. Figure 8-3 shows the component layout for the 512/2048 Kbyte Memory Expansion Board.
Page 100
Refer to Tables 8-2 and 8-3 when setting the jumpers on the 512/2048 Kbyte Memory Expansion Board.
Table 8-2. 512/2048 Kbyte Memory Expansion Board Jumper Settings ============================================================================== Settings Address Range *
------------------------------------------------------------------------------
E1 to E2, E5 to E6 1 to 3 megabyte E1 to E2, E4 to E5 2.5 to 4.5 megabyte
------------------------------------------------------------------------------
* Memory address range is dependent on system memory board configuration.
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