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

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FOREWORD
Notice
The information in this guide is subject to change without notice.
COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL
ERRORS OR OMISSIONS CONTAINED HEREIN; NOR FOR INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL.
This guide contains information protected by copyright.
may be photocopied or reproduced in any form without prior written consent
from Compaq Computer Corporation.
1990 Compaq Computer Corporation.
All rights reserved.
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.
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.
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.
reserves the right to make changes to the computers without notice.
diagrams and procedures in this document apply to these computers.
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
Printed in the USA.
The software may be used or copied only in
No part of this guide
It can be used
Compaq Computer Corporation
The
Diagnostic

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Summary of Contents for Compaq SLT 386s/20

  • Page 1 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.
  • Page 2 The following documentation is available for the COMPAQ SLT 386s/20 and COMPAQ SLT/286 Personal Computers: OPERATIONS GUIDE TECHNICAL REFERENCE GUIDE MAINTENANCE AND SERVICE GUIDE - OPTIONS AND PERIPHERALS MAINTENANCE AND SERVICE GUIDE - SUPPORT SOFTWARE MS-DOS REFERENCE GUIDE MS OS/2 COMMAND REFERENCE AND USER'S GUIDE...
  • 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: System Unit Laptop Enhanced Keyboard VGA Backlit Display 3 1/2 Inch 1.44 Megabyte Diskette Drive...
  • 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...
  • 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 Supertwist LCD Supertwist LCD Cable: Diameter 0.28 in.
  • Page 6 Read/Write Heads ============================================================================== Chapter 1.5 FIXED DISK DRIVES COMPAQ SLT 386s/20 Personal Computer ============================================================================== 120 MEGABYTE 60 MEGABYTE ------------------------------------------------------------------------------ Standard Configurations Model 120 Model 60 LED Indicators Orange Orange Formatted Capacity Per Drive 121.56 MB 60.7 MB Drives Supported Drive Height...
  • 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 Drive Height 1 inch 1 inch Drive Size 3 1/2 inch...
  • Page 8 Input Voltage 10 - 18.2 VDC Input Fuse 5A (Not user accessible) ------------------------------------------------------------------------------ Power Output: Steady State Peak ------------------------------------------------------------------------------ Cooling Convection ------------------------------------------------------------------------------ VDC Output: Nominal Continuous Maximum Nominal Current Current Peak Regulation Voltage Minimum Maximum Current Tolerance ------------------------------------------------------------------------------ + 5.00 ñ...
  • Page 9 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...
  • Page 10 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: Disconnect the AC power.

  • Page 11: Chapter 2.4 Problem Isolation Flowchart

    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,"...

  • Page 16: Chapter 3.1 Power On Self Test Messages

    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.

  • Page 17: Run Diagnostics

    System Unit Error keyboard. Replace the system board. ------------------------------------------------------------------------------ 401 - Printer None Printer Replace the system Error controller board. (COMPAQ SLT/286 only) ------------------------------------------------------------------------------ 601 - Diskette None Diskette Check and/or Controller Error Controller replace cables. circuitry Run DIAGNOSTICS. Replace the system board.
  • Page 18 Detection Error problem; added Check the or removed the coprocessor coprocessor installation. 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.

  • Page 19: Chapter 3.2 Diagnostic Error Codes

    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.
  • 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 Run SETUP.
  • 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...
  • 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...
  • 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 Replace the system ROM and 202 - 02 Failed RAM/ROM map test retest.
  • Page 24 echo test failed keyboard. Replace the keyboard and retest. 301 - 04 Keyboard short test 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...
  • 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 If a printer is connected, be failed sure it is turned ON and in the ONLINE mode.
  • 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...
  • 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:...
  • 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;...
  • 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...
  • 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...
  • Page 31 1210 - 01 Modem timed out waiting for SYNC Refer to the modem documentation for SETUP procedures. 1210 - 02 Modem timed out waiting Check the modem line. for response Replace the modem and retest. 1210 - 03 Modem exceeded data block retry limit 1210 - 04 RCV exceeded carrier lost...
  • 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:...
  • 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...
  • 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...
  • 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 Replace the tape cartridge and 1902 - xx Tape format failed retest.
  • 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...
  • 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...

  • Page 38: Chapter 3.3 Memory Error Codes

    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.

  • Page 39: Chapter 4.1 Illustrated Parts Breakdown

    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 Main Housing (plastics, including handle and fixed disk drive fascia insert) 108436-001 Rear Connector Cover 110622-001 (replaced by 110602-001) Rear Bezel (SLT/286) 110527-001 Rear Bezel (SLT 386s/20) 118376-001 ------------------------------------------------------------------------------ Metal Covers 118375-001 Metal Chassis (bottom) Drive Mounting Plate Processor Ground Pan Shield Memory Shield...
  • Page 41 Table 4-2. VGA Backlit Display ============================================================================== Description Part Number ------------------------------------------------------------------------------ Display Bezel 118372-001 Screw Covers, Flat * Screw Covers, Contoured * ------------------------------------------------------------------------------ LCD Display Panel 110451-001 ------------------------------------------------------------------------------ Display Plastic Parts 118370-001 Cosmetic Screw Covers, Contoured Cosmetic Screw Covers, Flat Left Hinge Cover Right Hinge Cover ------------------------------------------------------------------------------ Display Enclosure (includes latches)
  • Page 42 Table 4-3. Mass Storage Devices ============================================================================== Description Part Number ------------------------------------------------------------------------------ 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...
  • Page 43 Table 4-4. Cables ============================================================================== Description Part Number ------------------------------------------------------------------------------ Cable Kit 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 ============================================================================== System Boards...
  • Page 44 Table 4-5. COMPAQ SLT 386s/20 System Board Connectors ============================================================================== Desktop Expansion Base/CD-ROM Adapter Connector LCD Connector VGA Monitor Connector Parallel Connector System Power Connector Serial Connector Second Serial/Modem Connector External Storage Module Connector Fixed Disk Drive Connector Fixed Disk Drive Power Connector...
  • 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.
  • Page 46 Table 4-7. System and Standard Board Assemblies ============================================================================== Description Part Number ------------------------------------------------------------------------------ COMPAQ SLT 386s/20 System Board (including processor ground pan shield) 118359-001 COMPAQ SLT/286 System Board 110355-001 Processor Ground Pan Shield 110445-001 LED Indicator Board COMPAQ SLT 386s/20 118353-001...
  • Page 47 Table 4-8. AC Adapter ============================================================================== Description Part Number ------------------------------------------------------------------------------ AC Adapter COMPAQ SLT 386s/20 118460-001 COMPAQ SLT/286 110353-001 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 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 *...

  • Page 49: Chapter 4.2 Spare Part Numbers

    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.
  • Page 50 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...
  • 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...

  • Page 52: Compaq Diagnostics

    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...
  • Page 53 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: Torx T-8 screwdriver...

  • Page 54: Chapter 5.3 Preparation Procedures

    |- 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 |- LCD Panel |- Display Shield Assembly |- Display Backlight Inverter Board |- VGA Backlit Display Enclosure...

  • Page 55: Chapter 5.4 Battery Pack

    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.

  • Page 56: Chapter 5.5 Keyboard

    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...
  • Page 58 To replace the keyboard, reverse the steps in the previous illustrations. Chapter 5.6 CHASSIS Remove the hinge covers and keyboard, section 5.5. Remove the battery pack, section 5.4. Lower the display. 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 (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 COMPAQ SLT/286 Personal Computers. Remove the keyboard, section 5.5. Remove the battery pack, section 5.4. 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.
  • 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.

  • Page 62: Chapter 5.8 Led Indicator Board

    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...
  • Page 63 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.

  • Page 64: Chapter 5.9 Internal Power Supply

    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.

  • Page 65: Chapter 5.10 Mass Storage Devices

    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: Remove the keyboard, section 5.5. Remove the battery pack, section 5.4. Remove the chassis, section 5.6. Disconnect the power and signal cables from the diskette drive and fixed disk drive.
  • Page 68 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.
  • 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. Use a Torx T-10 screwdriver to remove the screws from the fixed disk drive enclosure.
  • Page 70 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. If applicable, lift the side flaps of the flexible ground shield before...
  • Page 71 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) Remove the fixed disk drive assembly. Remove the fixed disk drive enclosure and shock mounts.
  • 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. 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.
  • 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: Chapter 5.11 System Board

    To replace the drive mounting plate, reverse the steps in the previous illustrations. Chapter 5.11 SYSTEM BOARD Remove the keyboard, section 5.5. Remove the battery pack, section 5.4.
  • Page 75 Use a 3/16 inch nutdriver to remove the hex screws from the rear panel interface connectors. On the COMPAQ SLT 386s/20, use a Torx T-8 screwdriver to remove the two screws from the External Storage Module interface. Use a Torx T-10 screwdriver to remove the 3/8 inch screws from the...
  • Page 76 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.
  • Page 77 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.

  • Page 78: Chapter 5.13 Rear Bezel

    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 Remove the right hinge cover, section 5.5. Remove the keyboard, section 5.5, to allow easy disassembly of the LCD panel. 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.
  • Page 83 Lower the display. Remove the left hinge cover, section 5.5. Use a Torx T-15 screwdriver to remove the rear panel screws.
  • Page 84 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.
  • 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.

This manual is also suitable for:

Slt/286

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