Compaq SLT 386s/20, SLT/286 Maintenance And Service Manual

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, Registered United States Patent and Trademark Office.

SYSTEMPRO is a trademark of Compaq Computer Corporation.

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 may be trademarks and/or registered trademarks of their respective companies.

MAINTENANCE AND SERVICE GUIDE COMPAQ SLT 386s/20 PERSONAL COMPUTER, COMPAQ SLT/286 PERSONAL COMPUTER First Edition (June 1990) Text PN 118385-001

Preface

THE MAINTENANCE AND SERVICE GUIDE COMPAQ SLT 386s/20 PERSONAL COMPUTER, COMPAQ SLT/286 PERSONAL COMPUTER is a troubleshooting guide. It can be used as a reference when servicing the COMPAQ SLT 386s/20, Model 60 and Model 120, or the COMPAQ SLT/286, Model 20 and Model 40. Compaq Computer Corporation reserves the right to make changes to the computers without notice. The diagrams and procedures in this document apply to these computers. Diagnostic tests are designed to test only these products.

Interpreting Symbols

WARNING: TEXT SET OFF IN THIS MANNER INDICATES THAT FAILURE TO FOLLOW DIRECTIONS IN THE WARNING COULD RESULT IN BODILY HARM OR LOSS OF LIFE.

CAUTION: TEXT SET OFF IN THIS MANNER INDICATES THAT FAILURE TO FOLLOW DIRECTIONS COULD RESULT IN DAMAGE TO EQUIPMENT OR LOSS OF DATA.

IMPORTANT: Text set off in this manner presents clarifying information or specific instructions.

NOTE: Text set off in this manner presents commentary sidelights, or interesting points of information.

Locating Additional Information

Page 2

The following documentation is available for the COMPAQ SLT 386s/20 and COMPAQ SLT/286 Personal Computers:

o OPERATIONS GUIDE o TECHNICAL REFERENCE GUIDE o MAINTENANCE AND SERVICE GUIDE - OPTIONS AND PERIPHERALS o MAINTENANCE AND SERVICE GUIDE - SUPPORT SOFTWARE o MS-DOS REFERENCE GUIDE o MS OS/2 COMMAND REFERENCE AND USER'S GUIDE o BASIC REFERENCE GUIDE o COMPAQ SERVICE QUICK REFERENCE GUIDE o COMPAQ Service Advisories and Bulletins o HOW TO DO BUSINESS WITH COMPAQ CUSTOMER SERVICE

Technician Notes

CAUTION: ONLY AUTHORIZED TECHNICIANS TRAINED BY COMPAQ SHOULD ATTEMPT TO REPAIR THIS EQUIPMENT. ALL TROUBLESHOOTING AND REPAIR PROCEDURES ARE DETAILED TO ALLOW ONLY SUBASSEMBLY/MODULE LEVEL REPAIR. BECAUSE OF THE COMPLEXITY OF THE INDIVIDUAL BOARDS AND SUBASSEMBLIES, NO ONE SHOULD ATTEMPT TO MAKE REPAIRS AT THE COMPONENT LEVEL OR TO MAKE MODIFICATIONS TO ANY PRINTED WIRING BOARD. IMPROPER REPAIRS CAN CREATE A SAFETY HAZARD. ANY INDICATIONS OF COMPONENT REPLACEMENT OR PRINTED WIRING BOARD MODIFICATIONS MAY VOID ANY WARRANTY OR EXCHANGE ALLOWANCES.

Page 3

Chapter 1 - Specifications

INTRODUCTION

This chapter provides physical, environmental, and performance specifications for the following COMPAQ SLT 386s/20 Personal Computer and the COMPAQ SLT/286 Personal Computer subsystems:

o System Unit o Laptop Enhanced Keyboard o VGA Backlit Display o 3 1/2 Inch 1.44 Megabyte Diskette Drive o Fixed Disk Drives o Internal Power Supply o AC Adapter o Battery Pack

Chapter 1.1 SYSTEM UNIT

============================================================================== Dimensions:

Height 4.15 in. 10.54 cm Depth 8.50 in. 29.59 cm Width 13.50 in. 34.29 cm

Weight:

COMPAQ SLT 386s/20 Personal Computer:

Page 4

Model 120 14.0 lb 6.30 kg Model 60 14.0 lb 6.30 kg

COMPAQ SLT/286 Personal Computer:

Model 40 14.0 lb 6.30 kg Model 60 14.0 lb 6.30 kg

Standalone (Battery) Power Requirements:

Nominal Operating Voltage 12 VDC 12 VDC Average Power 8.0W 8.0W Peak Power 11.0W 11.0W

Environmental Requirements:

Temperature Range:

Operating 50oF to 95oF 10oC to 35oC Nonoperating -4oF to 140oF -20oC to 60oC

Relative Humidity (noncondensing):

Operating 10% to 90% 10% to 90% Nonoperating 5% to 95% 5% to 95%

Shock and Vibrations:

Shock 40 g, 11 ms, half sine (nonoperating) Vibration 3 g, 5 - 500 Hz 1/2 octave/minute sweep

2 hour duration (nonoperating) 1 g, 5 - 500 Hz (operating)

Maximum Unpressurized Altitude:

Operating 10,000 ft 3048 m Nonoperating 40,000 ft 12192 m

==============================================================================

Chapter 1.2 LAPTOP ENHANCED KEYBOARD

============================================================================== Dimensions:

Height 0.65 in. 1.65 cm Depth 6.45 in. 16.38 cm Width 13.50 in. 34.29 cm

Weight 1.38 lb 0.63 kg

Number of Keys 82 or 83 82 or 83

Cable:

Compressed 6.50 in. 16.51 cm Extended 24.00 in. 60.96 cm

Interface 6 pin mini DIN 6 pin mini DIN

connector connector

Power:

Volts 5 VDC 5 VDC Current 50 mA maximum 50 mA maximum

20 mA nominal 20 mA nominal

==============================================================================

Page 5

Chapter 1.3 VGA BACKLIT DISPLAY

============================================================================== Dimensions (image area):

Height 5.86 in. 14.88 cm Depth 0.90 in. 2.30 cm Width 7.81 in. 19.84 cm

Diagonal Size 10.00 in. 25.40 cm

Mounting Internal Internal

Display Compensated Compensated

Cable:

Diameter 0.28 in. 0.71 cm

==============================================================================

Supertwist LCD Supertwist LCD

Chapter 1.4 DISKETTE DRIVE

==============================================================================

-----------------------------------------------------------------------------Diskette Size 3 1/2 inch

LED Indicators:

Read/Write (high density) Green Read/Write (low density) Orange

Capacity Per Diskette (high/low) 1.44 MB/720 Kbytes

Drives Supported Two

Drive Height Third

Drive Rotation (rpm) 300

Transfer Rate (bps) (high/low) 500K/250K

Bytes Per Sector 512

Sectors Per Track (high/low) 18/9

1.44 MEGABYTE

Tracks Per Side (high/low) 80/80

Access Times:

Track to Track (ms) 3 Average (ms) 79 Settling Time (ms) 15 Latency Average (ms) 100

Cylinders (high/low) 80/80

Page 6

Read/Write Heads 2 ==============================================================================

Chapter 1.5 FIXED DISK DRIVES

COMPAQ SLT 386s/20 Personal Computer

==============================================================================

-----------------------------------------------------------------------------Standard Configurations Model 120 Model 60

LED Indicators Orange Orange

Formatted Capacity Per Drive 121.56 MB 60.7 MB

Drives Supported One One

Drive Height Third Third

Drive Size 3 1/2 inch 3 1/2 inch

Drive Type 50 55

Transfer Rate (Mb/s) 12 12

Sector Interleave 1:1 1:1

120 MEGABYTE 60 MEGABYTE

Bytes Per Sector 512 512

Sectors Per Track:

Physical 40 39 Logical 39 39

-----------------------------------------------------------------------------120 MEGABYTE 60 MEGABYTE

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

Number of Surfaces:

Physical 2 2 Logical 4 4

Tracks per Surface 1053 636

Access Times (including settling):

Track to Track (ms) <5 <5 Average (ms) <19 <19 Maximum (ms) <35 <35

Physical Cylinders 1522 1522

Physical Read/Write Heads 4 2

Logical Cylinders 760 760

Logical Read/Write Heads 8 4 ==============================================================================

Page 7

COMPAQ SLT/286 Personal Computer

==============================================================================

40 MEGABYTE 20 MEGABYTE

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

Standard Configurations Model 40 Model 20

LED Indicators Orange Orange

Formatted Capacity Per Drive 42.9 MB 21.4 MB

Drives Supported One One

Drive Height 1 inch 1 inch

Drive Size 3 1/2 inch 3 1/2 inch

Drive Type 22 2

Transfer Rate (Mb/s) 12 10

Sector Interleave 1:1 3:1

Bytes Per Sector 512 512

Sectors Per Track:

Physical 40 33 Logical 17 40

-----------------------------------------------------------------------------40 MEGABYTE 20 MEGABYTE

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

Number of Surfaces:

Physical 2 2 Logical 4 4

Tracks per Surface 1053 636

Access Times (including settling):

Track to Track (ms) 8 8 Average (ms) 29 29 Maximum (ms) 50 50

Physical Cylinders 1053 636

Physical Read/Write Heads 2 2

Logical Cylinders 524 615

Logical Read/Write Heads 4 4 ==============================================================================

Chapter 1.6 INTERNAL POWER SUPPLY

============================================================================== Input Requirements:

Page 8

Input Voltage 10 - 18.2 VDC Input Fuse 5A (Not user accessible)

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

Power Output:

Steady State 18W Peak 23W

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

Cooling Convection

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

VDC Output:

Nominal

Continuous Maximum Nominal Current Current Peak Regulation Voltage Minimum Maximum Current Tolerance

-----------------------------------------------------------------------------+ 5.00 0A 2A 3A ñ 3% + 12.00 0A 0.6A 1A ñ 8%

- 13.00 0A 60 mA 60 mA ñ 15%

- 26.00 0A 60 mA 60 mA ñ 15% ==============================================================================

Chapter 1.7 AC ADAPTER

============================================================================== Dimensions:

Height 2.40 in. 6.10 cm Depth 8.60 in. 21.84 cm Width 3.40 in. 8.64 cm

Weight 1.66 lb 0.75 kg

Power Supply:

Operating Voltage 110 VAC/220 - 240 VAC Steady State Power 20W Peak Power 33W Operating Current 1.0A Frequency 50/60 Hz

==============================================================================

Chapter 1.8 BATTERY PACK

============================================================================== Dimensions:

Height 1.20 in. 3.05 cm Depth 5.40 in. 13.72 cm Width 4.60 in. 11.68 cm

Weight 1.97 lb 0.89 kg

Power Supply:

Nominal Open Circuit Voltage 12.0 VDC Capacity 2.4A Power 29W

==============================================================================

Page 9

Chapter 2 - Power On Self Test (POST)

INTRODUCTION

This chapter lists the subassemblies checked by the Power On Self Test (POST) and briefly describes the types of error codes that can occur. The chapter also includes problem isolation procedures and a flowchart for quick reference.

Chapter 2.1 POST

POST is a series of diagnostic tests that runs automatically on the COMPAQ SLT 386s/20 and COMPAQ SLT/286 Personal Computers when the computers are turned on.

POST checks the following subassemblies to ensure that the computer system is functioning properly:

o System Board o System Memory o Memory Boards o Keyboard o Controller Circuitry o VGA Backlit Display (Monitor) o Fixed Disk Drives o Diskette Drives

POST also detects the type of mass storage devices installed in the computer.

If POST finds an error in the computer, an error condition is indicated by an audible and/or visual message. See Chapter 3, "Error Messages and Codes," for an explanation of the error codes and a recommended course of action.

Chapter 2.2 PRELIMINARY STEPS

If you encounter an error condition, complete the following steps before starting the problem isolation procedures:

1. Turn off power to the computer. Do not remove the battery pack.

2. Disconnect any external devices (leave the AC Adapter attached). Do not

disconnect the printer if you want to test the printer or use it to log error messages.

3. Install all appropriate loopback plugs and terminating plugs for complete

testing.

4. Clear the power on password, if it is preset by the user.

NOTE: The COMPAQ SLT 386s/20 has a power on password feature. You will know that the power on password is set when a key icon (o--m) appears

Page 10

on the screen when POST completes. If this occurs, you must enter the password to continue.

If you do not have access to the password, you must disable the power on password feature by resetting the password switch on the system board (see section 2.3, "Clearing Power On Password").

5. Position the brightness and contrast controls approximately in the center

of their range.

6. Insert the DIAGNOSTICS diskette into drive A.

7. Turn on the computer.

8. Follow the procedures of the Problem Isolation Flowchart in section 2.4.

Refer to Chapter 3, "Error Messages and Codes," for detailed information on problem isolation.

Chapter 2.3 CLEARING POWER ON PASSWORD

To clear the power on password feature on the COMPAQ SLT 386s/20, disable the power on password by resetting the system board switch. To do so, complete the following steps:

1. Disconnect the AC power.

2. Disassemble the computer to reach the system board (refer to Chapter 5).

3. Locate switch SW1 on the system board (Figure 2-1).

4. Change switch SW1-2 to the ON position (disable).

5. Reassemble the computer (refer to Chapter 5); then reconnect the AC power.

6. Turn on the computer and allow it to complete POST. If the key icon

(o--m) does not appear when POST completes, the power on password has been cleared.

To reset or enable the power on password switch, follow these steps:

1. Turn off the computer and disconnect the AC power.

2. Disassemble the computer to reach the system board (refer to Chapter 5).

3. Reset switch SW1-2 to the OFF position (enable).

4. Reassemble the computer.

5. Reconnect the AC power and turn on the computer.

IMPORTANT: If the power on password switch is not reset to its original position, it will be impossible to reestablish the password.

Page 11

Chapter 2.4 PROBLEM ISOLATION FLOWCHART

The problem isolation flowchart provides a quick reference for identifying and correcting problems that may occur during POST. The flowchart gives troubleshooting procedures for identifying malfunctions. It also directs you to the DIAGNOSTICS chapter in the MAINTENANCE AND SERVICE GUIDE SUPPORT SOFTWARE and to Chapter 3, "Error Messages and Codes," for more detailed troubleshooting information.

Page 12

Page 13

Page 14

Page 15

Page 16

Chapter 3 - Error Messages and Codes

INTRODUCTION

This chapter contains Power On Self Test (POST) messages, DIAGNOSTIC error codes, and memory error codes.

The messages and codes appear in tables that list the message or error code, a description of the error or its probable cause, and the action recommended to resolve the error condition.

Chapter 3.1 POWER ON SELF TEST MESSAGES

An error message results if a problem is encountered during POST, which runs automatically when the system is turned on.

Table 3-1 lists the messages for POST, the audible (beep) messages, probable causes, and recommended actions.

Table 3-1. Power On Self Test Messages ==============================================================================

Message Beeps Cause Action

-----------------------------------------------------------------------------101 - ROM Error 1 Long, System ROM 1. Inspect the ROM

1 Short placement.

-----------------------------------------------------------------------------101 - I/O ROM Error 1 Long, System ROM 1. Inspect the ROM

1 Short placement.

-----------------------------------------------------------------------------102 - System Board None System board Replace the system or System Memory board. Failure

-----------------------------------------------------------------------------162 - System 2 Short Configuration Run SETUP. Options Error error

-----------------------------------------------------------------------------162 - System Options 2 Short Configuration Run SETUP. Not Set incorrect

-----------------------------------------------------------------------------163 - Time & Date 2 Short Invalid time Run SETUP. Not Set or date in

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

Message Beeps Cause Action

-----------------------------------------------------------------------------164 - Memory 2 Short Configuration Run SETUP.

Probable Recommended

2. Verify the correct ROM.

3. Replace the ROM.

2. Verify the correct ROM.

3. Replace the ROM.

configuration memory

Probable Recommended

Page 17

Size Error memory

incorrect

-----------------------------------------------------------------------------167 - RTC Lost 2 Short Real time Replace system Power clock board.

-----------------------------------------------------------------------------XX000Y ZZ * None RAM failure 1. Replace the 201 - Memory Error memory board

(See Figure 3-1.)

2. Replace the system board.

-----------------------------------------------------------------------------XX000Y ZZ * None RAM failure Replace the system 203 - Memory board. Address Error

-----------------------------------------------------------------------------205 - Memory Error None Cache Memory Run DIAGNOSTICS.

error

-----------------------------------------------------------------------------301 - Keyboard Error None Keyboard Replace the

keyboard.

-----------------------------------------------------------------------------301 - Keyboard None Keyboard Replace the Error or Test keyboard. Fixture Installed

-----------------------------------------------------------------------------* See Section 3.3, Memory Error Codes

-----------------------------------------------------------------------------Probable Recommended

Message Beep Cause Action

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

303 - Keyboard None System board Replace the system Controller Error keyboard board.

controller

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

304 - Keyboard or None Keyboard 1. Replace the System Unit Error keyboard.

2. Replace the system board.

-----------------------------------------------------------------------------401 - Printer None Printer Replace the system Error controller board. (COMPAQ SLT/286 only)

-----------------------------------------------------------------------------601 - Diskette None Diskette 1. Check and/or Controller Error Controller replace cables.

circuitry 2. Run DIAGNOSTICS.

3. Replace the system board.

-----------------------------------------------------------------------------605 - Diskette 2 Short Mismatch in Run SETUP. Drive Error drive type

-----------------------------------------------------------------------------610 - External Storage None External Turn on External Device Failure Storage Module Storage Module or Hit F1 when ready attached but disconnect from

turned off computer.

-----------------------------------------------------------------------------702 - Coprocessor None Coprocessor 1. Run SETUP.

Page 18

Detection Error problem; added 2. Check the

or removed the coprocessor coprocessor installation.

3. Replace the coprocessor.

-----------------------------------------------------------------------------1125 - Internal Serial 2 Short Defective Replace the Port Failure internal system board.

serial port

-----------------------------------------------------------------------------1150 - Comm Port 2 Short Added or Run SETUP. Configuration Error removed modem,

or second serial interface board

-----------------------------------------------------------------------------1780 - Disk 0 None Fixed disk 1. Run DIAGNOSTICS. Failure drive/format 2. Replace the

error drive.

-----------------------------------------------------------------------------1781 - Disk 1 None Fixed disk 1. Run DIAGNOSTICS. Failure drive/format 2. Replace the

error drive.

-----------------------------------------------------------------------------Probable Recommended

Message Beeps Cause Action

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

1782 - Disk None Fixed disk 1. Run DIAGNOSTICS. Controller Failure drive 2. Replace the

controller drive. error

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

1790 - Disk 0 None Fixed disk 1. Run DIAGNOSTICS. Error drive error 2. Replace the

drive.

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

XX000Y ZZ Parity None Parity RAM Run DIAGNOSTICS. Check 2 failure

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

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

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

* Beeps can be disabled by the user during the SETUP program. ==============================================================================

Page 19

Chapter 3.2 DIAGNOSTIC ERROR CODES

DIAGNOSTIC error codes occur if the system recognizes a problem while running the COMPAQ DIAGNOSTICS program (refer to the MAINTENANCE AND SERVICE GUIDE SUPPORT SOFTWARE for additional information on running the DIAGNOSTICS software). These error codes help identify possible defective subassemblies. Tables 3-2 through 3-11 list possible error codes, a description of the error condition, and the action required to resolve the error 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 whether the error condition has been corrected. If the error code reappears, perform the next step, then run the DIAGNOSTICS program again. Follow this procedure until the DIAGNOSTICS program no longer detects an error condition.

The error codes appear in an AYY-XX or AAYY-XX format.

A or AA = number that represents faulty assembly

YY = test or action that failed XX = a specific problem

Example: Error code 610 - 21 shows that the diskette drive failed to get change line status.

For assistance in the removal and replacement of a particular subassembly, see Chapter 5, "Removal and Replacement Procedures."

Table 3-2. Processor Test Error Codes ============================================================================== Error

Page 20

Code Description Recommended Action

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

101 - 01 CPU test failed Replace the system board and retest

for error code 101 - 01.

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

102 - 01 Coprocessor initial The following steps apply to

status word incorrect error codes 102 - xx:

102 - 02 Coprocessor initial control 1. Run SETUP.

word incorrect 2. Replace the coprocessor and

retest.

102 - 03 Coprocessor tag word not 3. Replace the system board and

all ones retest.

102 - 04 Coprocessor tag word not

all zeros

102 - 05 Coprocessor exchange

command failed

102 - 06 Coprocessor masked

exception incorrectly handled

102 - 07 Coprocessor unmasked exception

incorrectly handled

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

Error Code Description Recommended Action

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

102 - 08 Coprocessor wrong mask bit set The following steps apply to

in status register error codes 102 - xx:

102 - 09 Coprocessor unable to store 1. Run SETUP.

real number 2. Replace the coprocessor and

retest.

102 - 10 Coprocessor real number 3. Replace the system board and

calculation test failed retest.

102 - 11 Coprocessor speed test

failed

102 - 12 Coprocessor pattern test

failed

102 - 15 Coprocessor is inoperative

or socket is unoccupied

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

Error Code Description Recommended Action

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

103 - 01 DMA page registers test Replace the system board and retest

failed for error codes 103 - xx through

114 - xx.

103 - 02 DMA byte controller test

failed

103 - 03 DMA word controller test

failed

104 - 01 Interrupt controller master

Page 21

test failed

104 - 02 Interrupt controller slave

test failed

104 - 03 Interrupt controller software

RTC is inoperative

105 - 01 Port 61 bit 6 not at zero

105 - 02 Port 61 bit 5 not at zero

105 - 03 Port 61 bit 3 not at zero

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

Error Code Description Recommended Action

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

105 - 04 Port 61 bit 1 not at zero Replace the system board and retest

for error codes 103 - xx through

105 - 05 Port 61 bit 0 not at zero 114 - xx.

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

107 - 01 CMOS RAM test failed

108 - 02 CMOS interrupt test failed

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

Error Code Description Recommended Action

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

108 - 03 CMOS interrupt test, CMOS Replace the system board and retest

not properly initialized for error codes 103 - xx through

114 - xx.

109 - 01 CMOS clock load data test

failed

109 - 02 CMOS clock rollover test

failed

Page 22

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

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

Error Code Description Recommended Action

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

112 - 03 Speed test fast mode out Replace the system board and retest

of range for error codes 103 - xx through

114 - xx.

112 - 04 Speed test unable to enter

slow mode

112 - 05 Speed test unable to enter

mixed mode

112 - 06 Speed test unable to enter

fast mode

112 - 07 Speed test system error

112 - 08 Speed test unable to enter

auto mode

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

114 - 01 Speaker test failed ==============================================================================

Table 3-3. Memory Test Error Codes ============================================================================== Error

Page 23

Code Description Recommended Action

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

201 - 01 Memory machine ID test failed The following steps apply to

error codes 201 - xx through

202 - 01 Memory system ROM checksum 202 - xx:

failed

1. Replace the system ROM and

202 - 02 Failed RAM/ROM map test retest.

2. Replace the system memory board

202 - 03 Failed RAM/ROM protect test and retest.

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

203 - 01 Memory write/read test The following steps apply to

error codes 203 - xx through

203 - 02 Error during saving program 211 - xx:

memory in write/read test

1. Replace the memory board and

203 - 03 Error during restore of retest.

program 2. Replace the system board and

retest.

204 - 01 Memory address test failed

204 - 02 Error during saving program

memory in address test

204 - 03 Error during restore of program

memory in address test

204 - 04 A20 address test failed

204 - 05 Page hit 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

210 - xx Increment Pattern Test

211 - xx Random Pattern Test ==============================================================================

Table 3-4. Keyboard Test Error Codes ============================================================================== Error Code Description Recommended Action

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

301 - 01 Keyboard short test, 8042 The following steps apply

self test failed to error codes 301 - xx through

304 - xx:

301 - 02 Keyboard short test,

interface test failed 1. Check the keyboard connection.

If disconnected, turn off the

301 - 03 Keyboard short test, computer and connect the

Page 24

echo test failed keyboard.

2. Replace the keyboard and retest.

301 - 04 Keyboard short test 3. Replace the system board and

retest.

302 - 01 Keyboard long test failed.

303 - 01 Keyboard LED test,

8042 self test failed

303 - 02 Keyboard LED test,

reset test failed

303 - 03 Keyboard LED test,

reset test failed

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

Error Code Description Recommended Action

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

303 - 04 Keyboard LED test, The following steps apply

LED command test failed to error codes 301 - xx through

304 - xx:

303 - 05 Keyboard LED test,

LED command test failed 1. Check the keyboard connection.

If disconnected, turn off the

303 - 06 Keyboard LED test, computer and connect the

LED command test failed keyboard.

2. Replace the keyboard and retest.

303 - 07 Keyboard LED test, 3. Replace the system board and

LED command test failed retest.

303 - 08 Keyboard LED test,

command byte restore test failed

303 - 09 Keyboard LED test,

LEDs failed to light

304 - 01 Keyboard typematic test

failed

304 - 02 Unable to enter mode 3

304 - 03 Incorrect scan code from

keyboard

304 - 04 No make code observed

304 - 05 Unable to disable typematic

feature

304 - 06 Unable to return to normal mode ==============================================================================

Table 3-5. Parallel Printer Test Error Codes

Page 25

============================================================================== Error Code Description Recommended Action

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

401 - 01 Printer failed or not The following steps apply to error

connected codes 401 - xx through 498 - xx:

402 - 01 Printer data register 1. If a printer is connected, be

failed sure it is turned ON and in

the ONLINE mode.

402 - 02 Printer control register 2. Replace the printer and/or the

failed printer cable and retest.

3. Replace the system board and

402 - 03 Printer data and control retest.

402 - 04 Printer loopback failed

402 - 05 Printer loopback and data

failed

402 - 06 Printer loopback and control

402 - 07 Printer loopback, data, and

control register failed

402 - 08 Printer interrupt test failed

402 - 09 Printer interrupt and data

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

Error Code Description Recommended Action

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

402 - 10 Printer interrupt and control The following steps apply to error

402 - 11 Printer interrupt, data, and 1. If a printer is connected, be

control register failed sure it is turned ON and in

the ONLINE mode.

402 - 12 Printer interrupt and loopback 2. Replace the printer and/or the

failed printer cable and retest.

3. Replace the system board and

402 - 13 Printer interrupt, loopback, retest.

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

Page 26

403 - 01 Printer pattern test failed

498 - 00 Printer failed or not connected ==============================================================================

Table 3-6. Diskette Drive Test Error Codes ============================================================================== Error Code Description Recommended Action

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

600 - xx Diskette ID drive types The following steps apply to error

test failed codes 600 - xx through 610 - xx:

601 - xx Diskette format failed 1. Replace the diskette and retest.

2. Check and/or replace the power

602 - xx Diskette read test failed and signal cables and retest.

3. Replace the diskette drive and

603 - xx Diskette write, read, compare retest.

test failed 4. Replace the system board and

retest.

604 - xx Diskette random seek test

failed

605 - xx Diskette ID media failed

606 - xx Diskette speed test failed

607 - xx Diskette wrap test failed

608 - xx Diskette write protect test

failed

609 - xx Diskette reset controller

test failed

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

Error Code Description Recommended Action

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

610 - xx Diskette change line test The following steps apply to error

failed codes 600 - xx through 610 - xx:

610 - 01 Exceeded maximum soft error 1. Replace the diskette and retest.

limit 2. Check and/or replace the power

and signal cables and retest.

610 - 02 Exceeded maximum hard error 3. Replace the diskette drive and

limit retest.

4. Replace the system board and

610 - 03 Previously exceeded maximum retest.

soft error limit

610 - 04 Previously exceeded maximum

hard error limit

610 - 05 Failed to reset controller

Page 27

610 - 06 Fatal error while reading

610 - 07 Fatal error while writing

610 - 08 Failed compare of write/read

buffers

610 - 09 Failed to format a track

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

Error Code Description Recommended Action

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

610 - 10 Failed sector wrap test The following steps apply to error

codes 600 - xx through 610 - xx:

610 - 20 Failed to get drive type

1. Replace the diskette and retest.

610 - 21 Failed to get change 2. Check and/or replace the power

line status and signal cables and retest.

3. Replace the diskette drive and

610 - 22 Failed to clear change retest.

line status 4. Replace the system board and

retest.

610 - 23 Failed to set drive type

in ID media

610 - 24 Failed to read diskette

media

610 - 25 Failed to verify diskette

media

610 - 26 Failed to read media in

speed test

610 - 27 Failed speed limits

610 - 28 Failed write protect test

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

697 - 00 Diskette type error The following steps apply

to error codes 697 - xx through

698 - 00 Diskette drive speed not 698 - xx:

within limits

1. Replace the diskette and retest.

2. Check and/or replace the diskette signal and power cable and retest.

3. Replace the diskette drive and retest.

4. Replace the system board and retest.

-----------------------------------------------------------------------------699 - 00 Diskette drive/media ID 1. Replace the media.

error, rerun SETUP 2. Run SETUP.

==============================================================================

Page 28

Table 3-7. Serial Test Error Codes ============================================================================== Error Code Description Recommended Action

-----------------------------------------------------------------------------1101 - 01 Serial Port Test: UART The following steps apply to error

DLAB bit failure codes 1101 - xx through 1109 - xx:

1101 - 02 Serial Port Test; line 1. Replace the serial interface

input or UART fault board and retest.

2. Replace the system board and

1101 - 03 Serial Port Test; address retest.

line fault

1101 - 04 Serial Port Test; data

line fault

1101 - 05 Serial Port Test; UART

control signal failure

1101 - 06 Serial Port Test; UART

THRE bit failure

1101 - 07 Serial Port Test; UART

DATA READY bit failure

1101 - 08 Serial Port Test; UART

TX/RX buffer failure

1101 - 09 Serial Port Test; INTERRUPT

circuit failure

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1101 - 10 Serial Port Test; COM1 set The following steps apply to error

to invalid interrupt codes 1101 - xx through 1109 - xx:

1101 - 11 Serial Port Test; COM2 set 1. Replace the serial interface

to invalid interrupt board and retest.

2. Replace the system board and

1101 - 12 Serial Port Test; DRIVER/ retest.

RECEIVER control signal failure

1101 - 13 Serial Port Test; UART

control signal interrupt failure

1101 - 14 Serial Port Test; DRIVER/

RECEIVER data failure

1109 - 01 Clock register initialization

failure

1109 - 02 Clock register rollover

failure

1109 - 03 Clock reset failure

Page 29

1109 - 04 Input line or clock failure

1109 - 05 Address line fault

1109 - 06 Data line fault ==============================================================================

Table 3-8. Modem Communications Test Error Codes ============================================================================== Error Code Description Recommended Action

-----------------------------------------------------------------------------1201 - xx Modem Internal Loopback Test The following steps apply to error

codes 1201 - xx through 1210 - xx:

1201 - 01 UART DLAB bit failure

1. Refer to the modem documentation

1201 - 02 Line input or UART failure for SETUP procedures.

2. Check the modem line.

1201 - 03 Address line fault 3. Replace the modem and retest.

1201 - 04 Data line fault

1201 - 05 UART control signal failure

1201 - 06 UART THRE bit failure

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

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1201 - 13 UART control signal interrupt The following steps apply to error

failure codes 1201 - xx through 1210 - xx:

1201 - 14 DRIVER/RECEIVER data failure 1. Refer to the modem documentation

for SETUP procedures.

1201 - 15 Modem detection failure 2. Check the modem line.

3. Replace the modem and retest.

1201 - 16 Modem ROM; checksum failure

1201 - 17 Tone detection failure

1202 - xx Modem Internal Test

Page 30

1202 - 01 Modem timed out waiting for SYNC

(local loopback mode)

1202 - 02 Modem timed out waiting for

response (local loopback mode)

1202 - 03 Modem exceeded data block retry

limit (local loopback mode)

1202 - 11 Modem timed out waiting for SYNC

(analog loopback originate mode)

1202 - 12 Modem timed out waiting for modem

response (analog loopback originate mode)

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1202 - 13 Modem exceeded data block The following steps apply to error

retry limit (analog loopback codes 1201 - xx through 1210 - xx: originate mode)

1. Refer to the modem documentation

1202 - 21 Modem timed out waiting for SETUP procedures.

for SYNC (analog loopback 2. Check the modem line. answer mode) 3. Replace the modem and retest.

1202 - 22 Modem timed out waiting

for modem response (analog loopback answer mode)

1202 - 23 Modem exceeded data block

retry limit (analog loopback answer mode)

1203 - xx Modem External Termination Test

1203 - 01 Modem external TIP/RING failure

1203 - 02 Modem external DATA TIP/RING

failure

1203 - 03 Modem line termination failure

1204 - xx Modem Auto Originate Test

1205 - xx Modem Auto Answer Test

1206 - xx Dial Multifrequency Tone Test

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1210 - xx Modem Direct Connect Test The following steps apply to error

codes 1201 - xx through 1210 - xx:

Page 31

1210 - 01 Modem timed out waiting

for SYNC 1. Refer to the modem documentation

for SETUP procedures.

1210 - 02 Modem timed out waiting 2. Check the modem line.

for response 3. Replace the modem and retest.

1210 - 03 Modem exceeded data block

retry limit

1210 - 04 RCV exceeded carrier lost

limit

1210 - 05 XMIT exceeded carrier lost

limit

1210 - 06 Timeout waiting for dial

tone

1210 - 07 Dial number string too long

1210 - 08 Modem timed out waiting for

remote response

1210 - 09 Modem exceeded maximum

redial limit

1210 - 10 Line quality prevented

remote connection

1210 - 11 Modem timed out waiting for

remote connection

1210 - 17 Tone detection failure ==============================================================================

Table 3-9. Fixed Disk Drive Test Error Codes ============================================================================== Error Code Description Recommended Action

-----------------------------------------------------------------------------1700 - xx Fixed disk ID drive The following steps apply to error

types test failed codes 1700 - xx through 1799 - xx:

1701 - xx Fixed disk format test 1. Replace the fixed disk drive

failed signal and power cables and

retest.

1702 - xx Fixed disk read test failed 2. Replace the fixed disk drive and

retest.

1703 - xx Fixed disk write/read/ 3. Replace the system board and

compare test failed retest.

1704 - xx Fixed disk random seek

test failed

1705 - xx Fixed disk controller

test failed

Page 32

1706 - xx Fixed disk drive ready

test failed

1707 - xx Fixed disk drive recalibrate

test failed

1708 - xx Fixed disk format bad track

test failed

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1709 - xx Fixed disk reset controller The following steps apply to error

test failed codes 1700 - xx through 1799 - xx:

1710 - xx Fixed disk park head 1. Replace the fixed disk drive

test failed signal and power cables and

retest.

1714 - xx Fixed disk file write 2. Replace the fixed disk drive and

test failed retest.

3. Replace the system board and

1715 - xx Fixed disk head select retest.

test failed

1716 - xx Fixed disk conditional

format test failed

1717 - xx Fixed disk Error

Correction Detection (ECC) test failed

1719 - xx Fixed disk drive power

mode test

1719 - 01 Exceeded maximum soft

error limit

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1719 - 02 Exceeded maximum hard The following steps apply to error

error limit codes 1700 - xx through 1799 - xx:

1719 - 03 Previously exceeded maximum 1. Replace the fixed disk drive

soft error limit signal and power cables and

retest.

1719 - 04 Previously exceeded maximum 2. Replace the fixed disk drive and

hard error limit retest.

3. Replace the system board and

1719 - 05 Failed to reset controller retest.

1719 - 06 Fatal error while reading

1719 - 07 Fatal error while writing

1719 - 08 Failed compare of

write/read/compare

Page 33

1719 - 09 Failed to format a track

1719 - 10 Failed sector wrap test

1719 - 19 Controller failed to

deallocate bad sector

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1719 - 40 Failed cylinder 0 The following steps apply to error

codes 1700 - xx through 1799 - xx:

1719 - 41 Drive not ready

1. Replace the fixed disk drive

1719 - 42 Recalibrate failed signal and power cables and

retest.

1719 - 43 Failed to format bad track 2. Replace the fixed disk drive and

retest.

1719 - 44 Failed fixed disk controller 3. Replace the system board and

diagnostics retest.

1719 - 45 Failed to get drive

parameters from ROM

1719 - 46 Invalid drive parameters

found in ROM

1719 - 47 Failed to park heads

1719 - 48 Failed to move disk table

to RAM

1719 - 49 Failed to read media in

file write test

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1719 - 50 Failed file I/O write test The following steps apply to error

codes 1700 - xx through 1799 - xx:

1719 - 51 Failed file I/O read test

1. Replace the fixed disk drive

1719 - 52 Failed file I/O compare test signal and power cables and

retest.

1719 - 53 Failed drive/head register 2. Replace the fixed disk drive and

test retest.

3. Replace the system board and

1719 - 54 Failed digital input register retest.

test

1719 - 55 Failed cylinder 1

1719 - 56 Fixed disk drive controller

Page 34

RAM diagnostics failed

1719 - 57 Fixed disk drive controller

to drive test failed

1719 - 58 Failed to write sector buffer

1719 - 59 Failed to read sector buffer

1719 - 60 Failed to compare sector buffer

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1719 - 61 Failed uncorrectable The following steps apply to error

ECC error codes 1700 - xx through 1799 - xx:

1719 - 62 Failed correctable ECC error 1. Replace the fixed disk drive

signal and power cables and

1719 - 63 Failed soft error rate retest.

2. Replace the fixed disk drive and

1719 - 65 Exceeded maximum bad sector retest.

per track 3. Replace the system board and

retest.

1719 - 66 Failed initial drive parameter

1719 - 67 Failed to write long

1719 - 68 Failed to read long

1719 - 69 Failed to read drive size from

controller

1719 - 70 Failed translate mode

1719 - 71 Failed nontranslated mode

1719 - 72 Bad track limit exceeded

1719 - 73 Previously exceeded bad track limit

1719 - 74 Failed sleep mode

1719 - 75 Failed idle mode

1719 - 76 Failed standby mode

1719 - 77 Failed to change mode

1719 - 78 Exceeded spinup time limit ==============================================================================

Table 3-10. Tape Drive Test Error Codes ==============================================================================

Page 35

Error Code Description Recommended Action

-----------------------------------------------------------------------------1900 - xx Tape ID failed The following steps apply to error

codes 1901 - xx through 1906 - xx:

1901 - xx Tape servo write failed

1. Replace the tape cartridge and

1902 - xx Tape format failed retest.

2. Check and/or replace the signal

1903 - xx Tape drive sensor test cable and retest.

failed 3. Replace the tape drive and

retest.

1904 - xx Tape BOT/EOT test failed 4. Replace the system board and

retest.

1906 - xx Tape write/read/compare

test failed

1906 - 01 Drive not installed

1906 - 02 Cartridge not installed

1906 - 03 Tape motion error

1906 - 04 Drive busy error

1906 - 05 Track seek error

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1906 - 06 Tape write protected error The following steps apply to error

codes 1901 - xx through 1906 - xx:

1906 - 07 Tape already servo written

1. Replace the tape cartridge and

1906 - 08 Unable to servo write retest.

2. Check and/or replace the signal

1906 - 09 Unable to format cable and retest.

3. Replace the tape drive and

1906 - 10 Format mode error retest.

4. Replace the system board and

1906 - 11 Drive recalibration error retest.

1906 - 12 Tape not servo written

1906 - 13 Tape not formatted

1906 - 14 Drive timeout error

1906 - 15 Sensor error flag

1906 - 16 Block locate (block ID) error

1906 - 17 Soft error limit exceeded

1906 - 18 Hard error limit exceeded

1906 - 19 Write (probably ID) error

Page 36

1906 - 20 NEC fatal error

1906 - 21 Received servo pulses second

time but not first

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------1906 - 22 Never got to EOT after The following steps apply to error

servo check codes 1901 - xx through 1906 - xx:

1906 - 23 Change line not set 1. Replace the tape cartridge and

retest.

1906 - 24 Write protect error 2. Check and/or replace the signal

cable and retest.

1906 - 25 Unable to erase cartridge 3. Replace the tape drive and

retest.

1906 - 26 Cannot identify drive 4. Replace the system board and

retest.

1906 - 27 Drive not compatible

with controller

1906 - 28 Format gap error

1906 - 30 Exception bit not set

1906 - 31 Unexpected drive status

1906 - 32 Device fault

1906 - 33 Illegal command

1906 - 34 No data detected

1906 - 35 Power on reset occurred

1906 - 91 Power lost during test ==============================================================================

Table 3-11. Video Test Error Codes ============================================================================== Error Code Description Recommended Action

-----------------------------------------------------------------------------2402 - 01 Video memory test failed The following steps apply to error

codes 2402 - xx through 2416 - xx:

2403 - 01 Video attribute test failed

Replace the system board and retest.

2404 - 01 Video character set test

failed

2405 - 01 Video 80 x 25 mode9x14

character cell test failed

2406 - 01 Video 80 x 25 mode8x8

character cell test failed

Page 37

2407 - 01 Video 40 x 25 mode test

failed

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

2412 - 01 Video gray scale test

failed

2414 - 01 Video white screen test

failed

2416 - 01 Video noise pattern test

failed

-----------------------------------------------------------------------------Error Code Description Recommended Action

-----------------------------------------------------------------------------2418 - 01 Video memory test failed The following steps apply to error

codes 2418 - xx through 2425 - xx:

2418 - 02 Video shadow RAM test failed

Replace the system board and retest.

2419 - 01 Video ROM checksum test

failed

2420 - 01 Video attribute test failed

2421 - 01 Video 640 x 200 graphics

mode test failed

2422 - 01 Video 640 x 350 16 color set

test failed

2423 - 01 Video 640 x 350 64 color set

test failed

2424 - 01 Video monochrome text mode

test failed

2425 - 01 Video monochrome graphics

mode test failed

-----------------------------------------------------------------------------2431 - xx Video 640 x 480 graphics Replace the system board and retest.

mode test failed

2432 - xx Video 320 x 200 graphics

mode test failed

==============================================================================

Page 38

Chapter 3.3 MEMORY ERROR CODES

Memory error codes appear when the system detects a memory fault during the Power On Self Test (201 or 203 error codes) or as a result of a diagnostic test. The TEST programs attempt to isolate the memory fault to a specific location, then generate a memory error code.

The memory error code points to a specific memory address. The physical location of the memory address depends on the number and type of memory boards installed and the type of memory device used.

Memory error codes are displayed in an eight digit format (XX000Y ZZ). The XX and Y alphanumeric codes are like key identification points for defective memory isolation.

XX000Y ZZ Error Message | | | | |-------- 201 (ROM) |||| | | | --------------------- Failed data bit. Values are: 00, 01, 02, 04, | | | 08, 10, 20, 40, 80, ?? ||| | | | 00 = parity bit | | | 01 = data bit 0 | | | 02 = data bit 1 | | | 04 = data bit 2 | | | 08 = data bit 3 | | | 10 = data bit 4 | | | 20 = data bit 5 | | | 40 = data bit 6 | | | 80 = data bit 7 | | | ?? = unable to determine failed data bit. ||| | | ------------------------ Failed byte. Values are 0, 1. || | -------------------------- Always 000. |

----------------------------- Failed address. Values are 00 through FF. 0X = error in 1st megabyte 1X = error in 2nd megabyte 2X = error in 3rd megabyte 3X = error in 4th megabyte

Page 39

Chapter 4 - Illustrated Parts Catalog

INTRODUCTION

This chapter provides illustrated parts breakdown and identifies the spare parts for the standard features of both the COMPAQ SLT 386s/20 and COMPAQ SLT/286 Personal Computers.

Chapter 4.1 ILLUSTRATED PARTS BREAKDOWN

System Unit

Page 40

Table 4-1. System Unit ============================================================================== Description Part Number

-----------------------------------------------------------------------------System Unit Assembly

1. Main Housing (plastics, including handle and fixed disk drive fascia insert) 108436-001

2. Rear Connector Cover 110622-001

(replaced by 110602-001)

3. Rear Bezel (SLT/286) 110527-001

4. Rear Bezel (SLT 386s/20) 118376-001

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

Metal Covers 118375-001

5. Metal Chassis (bottom)

6. Drive Mounting Plate

7. Processor Ground Pan Shield

8. Memory Shield Memory Shield (COMPAQ SLT/286 only) 110140-001

(replaced by 110140-002)

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

9. Internal Power Supply 110361-001

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

10. Battery Pack 110351-001

==============================================================================

VGA Backlit Display

Page 41

Table 4-2. VGA Backlit Display ============================================================================== Description Part Number

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

1. Display Bezel 118372-001 Screw Covers, Flat * Screw Covers, Contoured *

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

2. LCD Display Panel 110451-001

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

Display Plastic Parts 118370-001

3. Cosmetic Screw Covers, Contoured

4. Cosmetic Screw Covers, Flat

5. Left Hinge Cover

6. Right Hinge Cover

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

7. Display Enclosure (includes latches) 110508-001

8. Potentiometer Slide Knob

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

9. Left Hinge (includes display signal cable) 110450-001

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

10. Right Hinge (includes display ground cable) 110449-001

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

11. Display Shield Assembly with Ground Cables (2) 130762-001

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

12. Backlight Inverter Board 110452-001

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

* Not shown in Figure 4-3. ==============================================================================

Mass Storage Devices

Page 42

Table 4-3. Mass Storage Devices ============================================================================== Description Part Number

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

1. COMPAQ SLT 386s/20

120 Megabyte Fixed Disk Drive 118360-001 60 Megabyte Fixed Disk Drive 118355-001

2. COMPAQ SLT/286

40 Megabyte Fixed Disk Drive 110358-001

(replaced by 142365-001)

100 Megabyte Fixed Disk Drive 142365-001

3. 3 1/2 Inch 1.44 Megabyte Diskette Drive 110356-001

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

Fixed Disk Drive Assembly 118367-001

4. Fixed Disk Drive Enclosure

5. Fixed Disk Drive Shock Mounts

6. Flexible Ground Shield

7. Ground Clip

8. Screws

==============================================================================

Cables

Page 43

Table 4-4. Cables ============================================================================== Description Part Number

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

Cable Kit 118368-001

1. Single Diskette Drive Signal/Power Cable

2. Fixed Disk Drive Power Cable

3. Fixed Disk Drive Signal Cable

4. Power Supply Cable

5. Power Supply Switch Cable

==============================================================================

System Boards

Page 44

Table 4-5. COMPAQ SLT 386s/20 System Board Connectors ==============================================================================

1. Desktop Expansion Base/CD-ROM Adapter Connector

2. LCD Connector

3. VGA Monitor Connector

4. Parallel Connector

5. System Power Connector

6. Serial Connector

7. Second Serial/Modem Connector

8. External Storage Module Connector

9. Fixed Disk Drive Connector

10. Fixed Disk Drive Power Connector

11. External Keyboard Connector

12. Internal Keyboard Connector

13. Diskette Drive Connector

14. Password Switch

15. Fail Safe Timer Switch

16. LED Indicator Connector

17. Memory Expansion Slots

==============================================================================

Page 45

NOTE: The COMPAQ SLT/286 system board (Assy No. 001160) comes with a memory module (not shown in this illustration) mounted on the system board. When returning the COMPAQ SLT/286 system board (001160), the memory module must be attached.

Table 4-6. COMPAQ SLT/286 System Board Connectors ==============================================================================

1. Desktop Expansion Base Connector

2. LCD Connector

3. VGA Monitor Connector

4. Parallel Connector

5. System Power Connector

6. Serial Connector

7. Second Serial/Modem Connector

8. External Storage Module Connector

9. Fixed Disk Drive Connector

10. Fixed Disk Drive Power Connector

11. External Keyboard Connector

12. Internal Keyboard Connector

13. Diskette Drive Connector

14. LED Indicator Connector

15. Memory Expansion Slots

16. Coprocessor Jumper

==============================================================================

Standard Boards

Page 46

Table 4-7. System and Standard Board Assemblies ============================================================================== Description Part Number

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

1. COMPAQ SLT 386s/20

System Board (including processor ground pan shield) 118359-001

2. COMPAQ SLT/286

System Board 110355-001 Processor Ground Pan Shield 110445-001

3. LED Indicator Board

COMPAQ SLT 386s/20 118353-001 COMPAQ SLT/286 110453-001

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

4. Backlight Inverter Board 110452-001

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

5. COMPAQ SLT 386s/20

System ROMs 118402-001

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

6. COMPAQ SLT/286

System ROM 110542-001

==============================================================================

AC Adapter

Page 47

Table 4-8. AC Adapter ============================================================================== Description Part Number

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

1. AC Adapter

COMPAQ SLT 386s/20 118460-001 COMPAQ SLT/286 110353-001

2. Power Cord 110543-001

==============================================================================

Laptop Enhanced Keyboard

Page 48

Table 4-9. Laptop Enhanced Keyboards ============================================================================== Description Part Number

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

COMPAQ SLT 386s/20 Laptop Enhanced Keyboards

1. U.S. English Laptop Enhanced Keyboard 118448-001

2. UK English Laptop Enhanced Keyboard 118449-001 *

3. German Laptop Enhanced Keyboard 118450-001 *

4. French Laptop Enhanced Keyboard 118451-001 *

5. Italian Laptop Enhanced Keyboard 118452-001 *

6. Spanish Laptop Enhanced Keyboard 118453-001 *

7. Danish Laptop Enhanced Keyboard 118454-001 *

8. Norwegian Laptop Enhanced Keyboard 118456-001 *

9. Swedish/Finnish Laptop Enhanced Keyboard 118459-001 *

10. Swiss Laptop Enhanced Keyboard 118455-001 *

11. French Canadian Laptop Enhanced Keyboard 118458-001 *

12. Belgian Laptop Enhanced Keyboard 118457-001 *

13. Portuguese Laptop Enhanced Keyboard 118463-001 *

14. Turkish Laptop Enhanced Keyboard 118464-001 *

15. Greek Laptop Enhanced Keyboard 118465-001 *

16. Latin American Laptop Enhanced Keyboard 118466-001 *

17. Arabic Laptop Enhanced Keyboard 118467-001 *

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

COMPAQ SLT/286 Laptop Enhanced Keyboards

18. U.S. English Laptop Enhanced Keyboard 110354-001

19. UK English Laptop Enhanced Keyboard 110517-001 *

20. German Laptop Enhanced Keyboard 110516-001 *

21. French Laptop Enhanced Keyboard 110515-001 *

22. Italian Laptop Enhanced Keyboard 110514-001 *

23. Spanish Laptop Enhanced Keyboard 110513-001 *

24. Danish Laptop Enhanced Keyboard 110512-001 *

25. Norwegian Laptop Enhanced Keyboard 110511-001 *

26. Swedish/Finnish Laptop Enhanced Keyboard 110510-001 *

27. Swiss Laptop Enhanced Keyboard 110509-001 *

28. French Canadian Laptop Enhanced Keyboard 110674-001 *

Page 49

29. Belgian Laptop Enhanced Keyboard 110855-001 *

30. Portuguese Laptop Enhanced Keyboard 110859-001 *

31. Turkish Laptop Enhanced Keyboard 110858-001 *

32. Greek Laptop Enhanced Keyboard 110857-001 *

33. Latin American Laptop Enhanced Keyboard 110856-001 *

34. Arabic Laptop Enhanced Keyboard 110854-001 *

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

* Not shown in Figure 4-10. ==============================================================================

Chapter 4.2 SPARE PART NUMBERS

The following table provides a list of all of the spare part descriptions and part numbers for features of the COMPAQ 386s/20 and COMPAQ SLT/286 Personal Computers. Refer to the MAINTENANCE AND SERVICE GUIDE OPTIONS AND PERIPHERALS for spare part numbers to optional features.

Table 4-10. Spare Parts List ============================================================================== Description Part Number

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

System Unit Assembly

1. Main Housing (plastics, including handle and fixed disk drive fascia insert) 108436-001

2. Rear Connector Cover 110622-001

3. Rear Bezel (SLT/286) 110527-001

4. Rear Bezel (SLT 386s/20) 118376-001

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

Metal Covers 118375-001

Metal Chassis (bottom) Drive Mounting Plate Memory Shield Memory Shield (COMPAQ SLT/286 only) 110140-001

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

Internal Power Supply 110361-001

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

Battery Pack 110351-001

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

VGA Backlit Display

Display Bezel 118372-001 Screw Covers, Flat Screw Covers, Contoured Potentiometer Slide Knobs

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

LCD Display Panel 110451-001

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

Display Plastic Parts 118370-001

Cosmetic Screw Covers, Contoured Cosmetic Screw Covers, Flat Left Hinge Cover

(replaced by 110602-001)

(replaced by 110140-002)

Page 50

Right Hinge Cover

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

Display Enclosure (includes latches) 110508-001

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

Left Hinge (includes display signal cable) 110450-001

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

Right Hinge (includes display ground cable) 110449-001

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

Display Shield Assembly (including ground cables [2]) 130762-001

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

Mass Storage Devices

COMPAQ SLT 386s/20

120 Megabyte Fixed Disk Drive 118360-001 60 Megabyte Fixed Disk Drive 118355-001

COMPAQ SLT/286

40 Megabyte Fixed Disk Drive 110358-001

(replaced by

142365-001) 100 Megabyte Fixed Disk Drive 142365-001 3 1/2 Inch 1.44 Megabyte Diskette Drive 110356-001

-----------------------------------------------------------------------------Fixed Disk Drive Assembly 118367-001

Fixed Disk Drive Enclosure Fixed Disk Drive Shock Mounts Flexible Ground Shield Ground Clip Screws

-----------------------------------------------------------------------------Cables 118368-001

Single Diskette Drive Signal/Power Cable Fixed Disk Drive Power Cable Fixed Disk Drive Signal Cable Power Supply Cable Power Supply Switch Cable

-----------------------------------------------------------------------------Standard Board Assemblies

COMPAQ SLT 386s/20 System Board (including processor ground pan shield) 118359-001 System ROMs 118402-001

-----------------------------------------------------------------------------COMPAQ SLT/286 System Board 110355-001 System ROM 110542-001

-----------------------------------------------------------------------------System Board Insulator 110445-001

-----------------------------------------------------------------------------LED Indicator Board

COMPAQ SLT 386s/20 118353-001 COMPAQ SLT/286 110453-001

-----------------------------------------------------------------------------Backlight Inverter Board 110452-001

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

Memory Options

COMPAQ SLT 386s/20

1 Megabyte Memory Board 118357-001 2 Megabyte Memory Board 118356-001 4 Megabyte Memory Board 118358-001

COMPAQ SLT/286

1 Megabyte Memory Board 110355-001 4 Megabyte Memory Board 110863-001

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

Page 51

AC Adapter

COMPAQ SLT 386s/20 118460-001 COMPAQ SLT/286 110353-001

Power Cord 110543-001

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

COMPAQ SLT 386s/20 Laptop Enhanced Keyboards

U.S. English Laptop Enhanced Keyboard 118448-001 UK English Laptop Enhanced Keyboard 118449-001 German Laptop Enhanced Keyboard 118450-001 French Laptop Enhanced Keyboard 118451-001 Italian Laptop Enhanced Keyboard 118452-001 Spanish Laptop Enhanced Keyboard 118453-001 Danish Laptop Enhanced Keyboard 118454-001 Norwegian Laptop Enhanced Keyboard 118456-001 Swedish/Finnish Laptop Enhanced Keyboard 118459-001 Swiss Laptop Enhanced Keyboard 118455-001 French Canadian Laptop Enhanced Keyboard 118458-001 Belgian Laptop Enhanced Keyboard 118457-001 Portuguese Laptop Enhanced Keyboard 118463-001 Turkish Laptop Enhanced Keyboard 118464-001 Greek Laptop Enhanced Keyboard 118465-001 Latin American Laptop Enhanced Keyboard 118466-001 Arabic Laptop Enhanced Keyboard 118467-001

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

COMPAQ SLT/286 Laptop Enhanced Keyboards

U.S. English Laptop Enhanced Keyboard 110354-001 UK English Laptop Enhanced Keyboard 110517-001 German Laptop Enhanced Keyboard 110516-001 French Laptop Enhanced Keyboard 110515-001 Italian Laptop Enhanced Keyboard 110514-001 Spanish Laptop Enhanced Keyboard 110513-001 Danish Laptop Enhanced Keyboard 110512-001 Norwegian Laptop Enhanced Keyboard 110511-001 Swedish/Finnish Laptop Enhanced Keyboard 110510-001 Swiss Laptop Enhanced Keyboard 110509-001 French Canadian Laptop Enhanced Keyboard 110674-001 Belgian Laptop Enhanced Keyboard 110855-001 Portuguese Laptop Enhanced Keyboard 110859-001 Turkish Laptop Enhanced Keyboard 110858-001 Greek Laptop Enhanced Keyboard 110857-001 Latin American Laptop Enhanced Keyboard 110856-001 Arabic Laptop Enhanced Keyboard 110854-001

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

Documentation

Service Aids Kit 105264-001

Maintenance and Service Guide

COMPAQ SLT 386s/20 Personal Computer and COMPAQ SLT/286 Personal Computer 110707-001 Options and Peripherals 120557-001 Support Software 120576-001

Operations Guide

COMPAQ SLT 386s/20 Personal Computer 118354-001 COMPAQ SLT/286 Personal Computer 110170-001

(replaced by 110704-001)

Technical Reference Guide

COMPAQ SLT 386s/20 Personal Computer 118412-001

Page 52

COMPAQ SLT/286 Personal Computer 110181-001

(replaced by 110705-001)

COMPAQ SERVICE QUICK REFERENCE GUIDE 106854-001

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

Software

COMPAQ DIAGNOSTICS

5 1/4 Inch 1.2 Megabyte Diskette 130645-001 5 1/4 Inch 360 Megabyte Diskette 109333-001 3 1/2 Inch 1.44 Megabyte Diskette 109728-001

COMPAQ User Programs

5 1/4 Inch 1.2 Megabyte Diskette 130644-001 5 1/4 Inch 360 Megabyte Diskette 108289-001 3 1/2 Inch 1.44 Megabyte Diskette 109725-001

==============================================================================

Table 4-11. Miscellaneous Hardware ============================================================================== Description Part Number

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

Screw Kit 110544-001

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

Torx Screws (6-32 x 3/8 inch), pan head (10) Torx Screws (6-32 x 1 1/2 inch), pan head (10) Torx Screws (4-40 x 1/4 inch), pan head (10) Torx Screws (4-40 x 3/8 inch), pan head (10) Torx Screws (6-32 x 1/4 inch), pan head (10) Torx Screws (4-40 x 11/16 inch), pan head (10) Torx Screws Taptite (4-40 x 1/4 inch) (10) Torx Screws Taptite (4-40 x 3/4 inch) (10) Torx Screws Plastite (6-19 x 1/2 inch), pan head (10) Torx Screws Plastite (6-19 x 1 inch), pan head (10) Torx Screws (2-56 x 1/4 inch), pan head (10) Torx Screw Truss Head half depth drive (10) ==============================================================================

Page 53

Chapter 5 - Removal and Replacement Procedures

INTRODUCTION

This chapter provides module level removal and replacement procedures for the COMPAQ SLT 386s/20 and COMPAQ SLT/286 Personal Computers.

After completing all removal and replacement procedures, run the DIAGNOSTICS program to verify that all components operate properly. Refer to the MAINTENANCE AND SERVICE GUIDE SUPPORT SOFTWARE for information on installing new or updated utilities when adding or removing options.

Chapter 5.1 TOOL AND SOFTWARE REQUIREMENTS

To service the COMPAQ SLT 386s/20 or COMPAQ SLT/286 Personal Computer, you need the following:

o Torx T-8 screwdriver o Torx T-10 screwdriver o Torx T-15 screwdriver o 3/16 inch nutdriver o Modem terminating plug o 25 pin parallel interface loopback plug o 9 pin serial interface loopback plug o DIAGNOSTICS software o PLCC Extractor

Chapter 5.2 DISASSEMBLY/ASSEMBLY SEQUENCE CHART

Use the following chart as a reference along with the procedures in this chapter for removing and reinstalling the subassemblies of the COMPAQ SLT 386s/20 and COMPAQ SLT/286 Personal Computers.

5.3 Preparation Procedures

5.4 |- Battery Pack

5.5 |- Keyboard

5.6 |- Chassis

5.7 | |- Memory

| | |- Memory Shield | | |- Memory Boards ||

5.8 | | LED Indicator Board

| | |- Nylon Bushings ||

5.9 | |- Internal Power Supply

5.10 | |- Mass Storage Devices

| |- Drive Mounting Plate with Mass Storage Devices

Page 54

| |- Fixed Disk Drive | | |- Drive Enclosure | | |- Memory Shield | | |- Shock Mounts | |- Diskette Drive | |- Drive Mounting Plate ||

5.11 | |- System Board

5.12 |- Rear Connector Cover

5.13 |- Rear Bezel

5.14 |- VGA Backlit Display

Chapter 5.3 PREPARATION PROCEDURES

Before beginning the removal and replacement procedures, complete the following steps:

1. Turn off the computer.

2. Disconnect all external devices (printer, monitor, and so on) from the

computer.

3. Disconnect the AC Adapter from its power source, then from the computer.

Page 55

CAUTION: STATIC ELECTRICITY CAN DAMAGE THE CMOS COMPONENTS. BE SURE THAT YOU

ARE PROPERLY GROUNDED BEFORE PERFORMING ANY OF THE FOLLOWING PROCEDURES.

CAUTION: SCREWS IN THIS SYSTEM ARE NOT INTERCHANGEABLE. AS YOU REMOVE SCREWS, PLACE THEM WITH THE COMPONENT YOU REMOVED. DAMAGE MAY OCCUR IF YOU INSERT THESE SCREWS IN THE WRONG PLACE.

Chapter 5.4 BATTERY PAC

Page 56

To replace the battery pack, place the new battery pack into the enclosure and press down. Slide the latches into place.

WARNING: DISPOSAL OF A BATTERY SHOULD BE DONE WITHIN COMPLIANCE OF LOCAL REGULATIONS OR RETURNED TO COMPAQ COMPUTER CORPORATION BY WAY OF ESTABLISHED PARTS RETURN METHODS.

Chapter 5.5 KEYBOARD

Remove the hinge covers by rolling back the top of the hinge cover, then lift it up.

Page 57

Page 58

To replace the keyboard, reverse the steps in the previous illustrations.

Chapter 5.6 CHASSIS

1. Remove the hinge covers and keyboard, section 5.5.

2. Remove the battery pack, section 5.4.

3. Lower the display.

4. Use the Torx T-15 screwdriver to remove the rear panel screws. The rear

panel will contain two long screws in the middle and four short screws in the corners.

Page 59

NOTE: To slide the chassis completely out of the computer, you need to loosen the display data ground cable screw, using a Torx T-10 screwdriver, and remove the pull tab on the display data cable from the system board (refer to Figure 5-45 and Figure 5-46).

To replace the chassis, reverse the steps in the previous illustrations.

Chapter 5.7 MEMORY

NOTE: Memory boards are not interchangeable between the COMPAQ SLT 386s/20

Page 60

and COMPAQ SLT/286 Personal Computers.

1. Remove the keyboard, section 5.5.

2. Remove the battery pack, section 5.4.

3. Remove the chassis, section 5.6.

Removing the Memory Shield

Use a Torx T-10 screwdriver to remove the screws that secure the memory shield to the drive mounting plate.

To replace the memory shield, reverse the step in the previous illustration.

Removing Optional Memory Boards

Page 61

To replace a memory board, reverse the step in the previous illustration.

Memory Expansion

COMPAQ SLT 386s/20 Personal Computer

Memory expansion alternatives for the COMPAQ SLT 386s/20 are shown in Table 5-1. Memory boards can be added in combinations of 1, 2, and 4 megabytes.

NOTE: The following table does not represent all possible configurations. Memory boards can be installed in any combination and in any available slot.

Table 5-1. Memory Expansion Alternatives - COMPAQ SLT 386s/20 Personal Computer ============================================================================== System Memory Memory Board(s) Added to Slot 1, 2, or 3 Total Memory

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

2MB 1MB 3MB 2MB 2MB 4MB 2MB 1MB 2MB 5MB 2MB 4MB 6MB 2MB 1MB 4MB 7MB 2MB 2MB 4MB 8MB 2MB 1MB 2MB 4MB 9MB 2MB 4MB 4MB 10MB 2 MB 1 MB 4 MB 4 MB 11 MB 2 MB 2 MB 4 MB 4 MB 12 MB 2 MB 4 MB 4 MB 4 MB 14 MB ==============================================================================

COMPAQ SLT/286 Personal Computer

Memory expansion for the COMPAQ SLT/286 is shown in Table 5-2. Memory boards

Page 62

can be added in combinations of 1 and 4 megabytes.

NOTE: The following table does not represent all possible configurations. Memory boards can be installed in any combination and in any available slot.

Table 5-2. Memory Expansion Alternatives - COMPAQ SLT/286 Personal Computer ============================================================================== System Memory Memory Board(s) Added to Slot 1, 2, or 3 Total Memory

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

640 KB 1 MB 1.6 MB 640 KB 1 MB 1 MB 2.6 MB 640 KB 1 MB 1 MB 1 MB 3.6 MB 640 KB 4 MB 4.6 MB 640 KB 1 MB 4 MB 5.6 MB 640 KB 1 MB 1 MB 4 MB 6.6 MB 640 KB 4 MB 4 MB 8.6 MB 640 KB 1 MB 4 MB 4 MB 9.6 MB 640 KB 4 MB 4 MB 4 MB 12.6 MB ==============================================================================

Chapter 5.8 LED INDICATOR BOARD

1. Remove the chassis, section 5.6.

2. Remove the memory shield, section 5.7.

CAUTION: THE LED INDICATOR BOARD WILL FALL OUT OF THE ALUMINUM MEMORY SHIELD ONCE THE SCREWS ARE REMOVED.

Removing the LED Indicator Board from the COMPAQ SLT 386s/20

Use a Torx T-10 to remove the two black, low profile screws that secure the LED indicator board to the memory shield.

Page 63

CAUTION: SCREWS FROM THE MEMORY SHIELD ARE NOT INTERCHANGEABLE. THE COMPAQ SLT 386s/20 MEMORY BOARD CAN BE DAMAGED IF THE WRONG SCREWS ARE USED.

Removing the LED Indicator Board from the COMPAQ SLT/286

Use a Torx T-10 screwdriver to remove the screws that secure the LED indicator board to the memory shield.

Removing the Nylon Bushings

Page 64

To replace the LED indicator board and nylon bushings, reverse the steps in the previous illustrations. When replacing the LED indicator board, be sure the nylon bushings are placed between the board and aluminum memory shield.

CAUTION: IF THE NYLON BUSHINGS ARE NOT REPLACED PROPERLY, THE LED INDICATOR BOARD WILL SHORT OUT.

Chapter 5.9 INTERNAL POWER SUPPLY

1. Remove the keyboard, section 5.5.

2. Remove the battery pack, section 5.4.

3. Remove the chassis, section 5.6.

4. Remove the modem or serial interface board, if installed.

5. Use a Torx T-10 screwdriver to remove the power supply screws.

Page 65

6. Pull up on the right side of the power supply assembly until the power

cable disconnects from the system board.

To replace the power supply, reverse the step in the previous illustration.

Chapter 5.10 MASS STORAGE DEVICES

Removing the Drive Mounting Plate with the Mass Storage Devices

Page 66

The drive mounting plate can be removed without removing the mass storage devices.

To remove the mounting plate with the mass storage devices in place, do the following:

1. Remove the keyboard, section 5.5.

2. Remove the battery pack, section 5.4.

3. Remove the chassis, section 5.6.

4. Disconnect the power and signal cables from the diskette drive and fixed

disk drive.

5. Use a Torx T-10 screwdriver to remove the screws.

Page 67

Page 68

To replace the Drive Mounting Plate with the mass storage devices, reverse the steps in the previous illustrations.

IMPORTANT: When replacing the drive mounting plate, install the short screws to the outside of the drives to prevent damage to the system board.

Removing the Fixed Disk Drive Assembly

NOTE: The fixed disk drive on the COMPAQ SLT 386s/20 contains a flexible ground shield that covers the drive. The ground shield is shown in the following illustrations of the fixed disk drive assembly.

1. Use a Torx T-15 screwdriver to remove the screw securing the flexible

ground shield, if applicable.

2. Lift the flexible ground shield flap that covers the power and signal

cable connectors. Be careful not to damage the ground shield.

Page 69

NOTE: If the drive cables are being replaced, first disconnect the power and signal cables from the drive; then from the system board.

3. Use a Torx T-10 screwdriver to remove the screws from the fixed disk drive

enclosure.

Page 70

Removing the Fixed Disk Drive Enclosure and Shock Mounts

1. Rotate the drive enclosure to remove it from the fixed disk drive.

CAUTION: ON THE COMPAQ SLT 386s/20, BE CAREFUL NOT TO THE DAMAGE THE FLEXIBLE GROUND SHIELD WHEN REMOVING THE DRIVE ENCLOSURE.

2. If applicable, lift the side flaps of the flexible ground shield before

removing the shock mounts.

Page 71

3. Remove the shock mounts by grasping the center of the rails and pulling

the shock mounts straight out.

To replace the shock mounts, fixed disk drive enclosure, and fixed disk drive, reverse the steps in the previous illustrations.

CAUTION: SHOCK MOUNTS MAY BEND WHEN REMOVED. BE SURE THE PINS ARE STRAIGHTENED BEFORE REPLACING THE SHOCK MOUNTS ON THE DRIVE.

IMPORTANT: When replacing the fixed disk drive, install the short screws to the outside of the drive to prevent damage to the system board.

Removing the Flexible Ground Shield (COMPAQ SLT 386s/20 Only)

1. Remove the fixed disk drive assembly.

2. Remove the fixed disk drive enclosure and shock mounts.

3. Use a Torx T-15 screwdriver to remove the four screws securing the

flexible ground shield to the drive.

Page 72

To replace the flexible ground shield, follow these steps:

IMPORTANT: To prevent damage to the fixed disk drive, be sure the flexible ground shield is replaced properly.

1. Replace the flexible ground shield, white side down, on the component side

of the fixed disk drive. Be sure the long flap is facing the connector.

2. Extend the slide flaps of the flexible ground shield.

3. Replace the shock mounts to the fixed disk drive, then fold the flexible

ground shield side flaps over the outside of the shock mounts.

IMPORTANT: To ensure proper grounding, be sure the flexible ground shield side flaps are folded over the outside of the shock mounts.

Removing a Diskette Drive

NOTE: If the drive cable is being replaced, remove the diskette drive, then disconnect the drive cable from the system unit.

Use the Torx T-15 screwdriver to remove the four screws from the diskette drive.

Page 73

To replace the diskette drive, reverse the steps in the previous illustrations.

Removing the Drive Mounting Plate

Disconnect any mass storage device power and signal cables from the system board.

Page 74

To replace the drive mounting plate, reverse the steps in the previous illustrations.

Chapter 5.11 SYSTEM BOARD

1. Remove the keyboard, section 5.5.

2. Remove the battery pack, section 5.4.

Page 75

3. Remove the chassis, section 5.6.

4. Remove the memory shield and, if applicable, the memory boards,

section 5.7.

5. Remove the internal power supply, section 5.9.

6. Remove the mass storage devices, section 5.10.

7. Use a 3/16 inch nutdriver to remove the hex screws from the rear panel

interface connectors.

8. On the COMPAQ SLT 386s/20, use a Torx T-8 screwdriver to remove the two

screws from the External Storage Module interface.

9. Use a Torx T-10 screwdriver to remove the 3/8 inch screws from the

expansion base (J101) connector.

Page 76

10. Use a Torx T-10 screwdriver to remove the remaining screws from the

system board.

To replace the system board, reverse the steps in the previous illustrations.

IMPORTANT: Be sure the J101 connector screws are installed first before you replace the other connector screws. This assures the connectors are aligned properly.

WARNING: THE SYSTEM BOARD CONTAINS A LITHIUM BATTERY INTEGRAL TO THE CLOCK

Page 77

CHIP THAT IS SOLDERED TO THE SYSTEM BOARD. THE LITHIUM BATTERY MAY EXPLODE IF MISHANDLED. DO NOT ABUSE, DISASSEMBLE, OR DISPOSE OF IN FIRE. RETURN THE SYSTEM BOARD TO COMPAQ COMPUTER CORPORATION FOR PROPER REPLACEMENT OR DISPOSAL OR YOU MAY DISPOSE OF THE BATTERY WITHIN COMPLIANCE OR LOCAL REGULATIONS.

NOTE: UPS will not airship (UPS blue label) lithium batteries.

Chapter 5.12 REAR CONNECTOR COVER

1. Open the rear panel connector cover door.

2. Gently disconnect the plastic door from the hinges as illustrated below.

Page 78

To replace the rear connector cover, bow the plastic door out, insert the hinge pins and snap the latches in place.

Chapter 5.13 REAR BEZEL

Remove the rear bezel by gently working it loose from the latches.

To replace the rear bezel, hook the top latches in place; then rotate downward.

Page 79

Chapter 5.14 VGA BACKLIT DISPLAY

1. Remove the right hinge cover, section 5.5.

2. Remove the keyboard, section 5.5, to allow easy disassembly of the LCD

panel.

3. Remove the battery pack, section 5.4.

Removing the LCD Panel

Use a Torx T-15 screwdriver to remove the screws.

Page 80

CAUTION: TO PREVENT DAMAGE TO THE BACKLIGHT DISPLAY SIGNAL CABLE, BE SURE TO SLIDE THE RETAINING COLLAR UP BEFORE REMOVING THE CABLE.

Page 81

To replace the LCD panel, reverse the steps in the previous illustrations.

Removing the Display Shield Assembly

Use a Torx T-10 screwdriver to remove the screws.

Page 82

To replace the Display Shield Assembly, reverse the step in the previous illustration.

Removing the Display Backlight Inverter Board

Use a Torx T-15 screwdriver to remove the screws.

To replace the Display Backlight Inverter Board, reverse the step in the previous illustration.

Removing the VGA Backlit Display Enclosure

Page 83

1. Lower the display.

2. Remove the left hinge cover, section 5.5.

3. Use a Torx T-15 screwdriver to remove the rear panel screws.

Page 84

4. Raise the display.

Page 85

To replace the VGA Backlit Display Enclosure, reverse the steps in the previous illustrations.

Removing the Hinges

CAUTION: DO NOT PULL APART THE HINGES.

Page 86

To replace the hinges, reverse the steps in the previous illustrations.

Page 87

Chapter 6 - Jumper and Switch Information

INTRODUCTION

This chapter provides jumper and switch settings for the COMPAQ SLT 386s/20 and COMPAQ SLT/286 system boards.

The default settings shown in the tables are set for the computer as configured by Compaq Computer Corporation. These settings need to be changed only when the system configuration changes.

Chapter 6.1 COMPAQ SLT 386s/20 SYSTEM BOARD

The COMPAQ SLT 386s/20 system board contains one switch. Table 6-1 lists the switch settings and describes the function for switch SW1. Figure 6-1 shows the location of the switch on the system board.

Table 6-1. Switch SW1 Settings - COMPAQ SLT 386s/20 Personal Computer ============================================================================== Switch Position Status Function

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

SW1-1 OFF Disables Enables or disables the fail safe

ON (default) Enables timer.

SW1-2 OFF (default) Enables Clears the power on password. Refer

ON Disables to "Clearing Power On Password" in

Chapter 2 for procedures.

==============================================================================

Page 88

Chapter 6.2 COMPAQ SLT/286 SYSTEM BOARD

The COMPAQ SLT/286 system boards contain one jumper. Table 6-2 lists the jumper positions and describes the function of jumper J1. Figure 6-2 and Figure 6-3 show the location of the jumper on the system board.

Table 6-2. Jumper J1 Settings - COMPAQ SLT/286 Personal Computer ============================================================================== Jumper Position Function

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

J1 1-2 Provides 8 MHz 80287 coprocessor configuration

J1 2-3 (default) Provides 12 MHz 80C287 coprocessor configuration ==============================================================================

NOTE: Jumpers E2, E3, and E4 are reserved. These jumpers must be installed for proper operation of the system board.

Page 89