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Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 1
.... The software may be used or copied only in the USA
COMPAQ, DESKPRO, SYSTEMPRO, LTE, FASTART Registered United States Patent and Trademark Office. MAINTENANCE AND SERVICE GUIDE COMPAQ PORTABLE 486c Personal Computer
First Edition (October 1991) Text Number 128987-001 nor for technical or editorial errors or omissions contained herein; SLT is a trademark of their respective companies...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 2
...
15.6 inch
39.6 cm
Depth
5.5 inch
13.9 cm
Weight (with keyboard)
Model 210
17.6 lb
7.9 kg
Model 120
17.6 lb
7.9 kg
Environmental Requirements Specifications
Introduction
This chapter provides physical, environmental, and performance specifications for the following COMPAQ PORTABLE 486c Personal Computer subsystems:
o System Unit o Full Function 101/102 Key Keyboard o Active...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 7
... POST
POST is set when a key icon (0--m) appears on the COMPAQ PORTABLE 486c Personal Computer when it to the computer.
2. Chapter 2. Power On Self Test (POST)
Introduction
This chapter lists the subassemblies checked by the user. The chapter also includes problem isolation procedures and a flowchart for complete testing.
4. See Chapter 3, "Error Messages and Codes," for an explanation...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 9
...Diagnostics chapter in the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE and to Chapter 5). 3. Set switch SW5 to ON (Figure 2-1).
4. If the key icon
(o--m) does not appear when POST completes, the power on the I /O board (refer to Chapter 3, "Error Messages and Codes," for identifying malfunctions. Chapter 2.4 Problem Isolation Flowchart
The problem isolation flowchart provides...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 17
Table 3-1 lists the messages for the COMPAQ PORTABLE 486c Personal Computer. I/O ROM Error 1 Long, Option ROM
1.
board.
162 - incorrect
170 - Error Messages and Codes
This chapter contains Power On Self Test (POST) messages, Diagnostic error codes, and memory error codes for POST, the audible (beep) messages, probable causes, and recommended actions. Chapter 3.1 Power On Self ...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 32
... COMPAQ
2. Serial Test Error Codes
Error
Recommended
Code
Description
Action
1101 - 01
Serial Port Test: UART
Replace the I /O board
and retest.
699 - 00
Diskette drive/media ID
1. address line fault
1101 - 04
Serial Port Test; UART control signal failure
1101 - 06
Serial Port Test; INTERRUPT circuit failure
1101 - 10
Serial Port Test; DRIVER/
Replace...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 40
... retest.
3. controller
1906 - 28
Format gap error
1906 - 30
Exception bit not set
The following steps apply
to error codes 1901 - Replace the tape
1906 - 12
Tape not servo written
drive and retest.
3. xx:
1. xx
1906 - 24
Write protect error
through 1906 - 1906 - 08
Unable to servo write
Error
Recommended
Code
Description
Action
1906 - 09
Unable to format...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 42
... memory address depends on the number and type of memory modules installed and the type of a diagnostic test.
Pointing Device Interface Test Error Codes
Error
Recommended
Code
Description
Action
8601 - Replace the I/O
board and retest. The TEST programs attempt to isolate the memory fault to a specific memory address. xx
Video 640 x 480 graphics mode test failed
2432...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 44
Chapter 4.1 Illustrated Parts Breakdown
System Unit Illustrated Parts Catalog
This chapter provides an illustrated parts breakdown and identifies the spare parts for the standard features of the COMPAQ PORTABLE 486c Personal Computer. Chapter 4.
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 48
... Device (Mouse) Connector 16. Enhanced Option Connector 2. Fixed Disk Drive Connector 6. Intel 486 33 MHz Microprocessor Connector 3. Real Time Clock/Battery Connector 5. External Storage Module Connector 14. Table 4-5. COMPAQ PORTABLE 486c Personal Computer Processor Board Connectors 1. Memory Module Connectors, Slots 2, 3, and 4 2. Memory Module Connector, Slot 1
I/O Board...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 52
... and Peripherals Volume 3
120577-001
Support Software
120576-001
Operations Guide
128940-001
COMPAQ PORTABLE 486c
PERSONAL COMPUTER TECHNICAL
REFERENCE GUIDE
128822-001
COMPAQ SERVICE QUICK REFERENCE
GUIDE
106854-001
Diagnostics
3 1/2 inch 720 Kbyte Diskette
*
User Programs
3 1/2 inch 1.44 Megabyte Diskette
*
* The software spare part numbers are subject to change. Please...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 54
... 5. Removal and Replacement Procedures
Introduction
This chapter provides module level removal and replacement procedures for information on installing new or updated utilities when adding or removing options.
Networks built into many cases, the discharge contains enough power to the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE for the COMPAQ PORTABLE 486c Personal Computer. Table...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 57
...COVER ||
5.8 | |-- Processor Board | | |-- KEYBOARD |
5.6 |-- Conductive plastic bags - Transparent shielding tubes
Chapter 5.2 Tool and Software Requirements
To service the COMPAQ PORTABLE 486c Personal Computer, you need...replacing the subassemblies of 1 megohm resistance
o Static dissipating table or floor mats with ground cord of the COMPAQ PORTABLE 486c Personal Computer.
5.4 ...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 85
...Some of 32 megabytes.
NOTE: Memory modules can be installed in any available slot. However, slot 1 must contain a memory module. Memory Expansion
COMPAQ PORTABLE 486c Personal Computer
Memory Module(s) Added
Total
Slot 1
to ... replace the keylock, reverse the steps in combinations of 2, 4, and 8 megabytes for a total of the memory expansion alternatives for the COMPAQ PORTABLE 486c ...
Compaq Portable 486c Personal Computer Maintenance and Service Guide - Page 87
... in CMOS.
ON allows the EISA
configuration to the Diskette Drive. Jumper and Switch Information
This chapter provides the switch settings for the COMPAQ PORTABLE 486c Personal Computer I /O board contains six switches. Table 6-1.
SW3
ON
Enabled
Controls Read/Write
OFF
Disabled
to be changed .
ON allows the user to avoid conflict
...
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