Compaq SLT 386s/20 Manual

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.

1990 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

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.

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:

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

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

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. 0.71 cm

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

Chapter 1.4 DISKETTE DRIVE

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

1.44 MEGABYTE

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

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

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

Read/Write Heads 2

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

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 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

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

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

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:

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

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

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

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.

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