Compaq Compaq Portable II 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.
1986, 1990 Compaq Computer Corporation.
All rights reserved. Printed in the USA.
COMPAQ, DESKPRO, SYSTEMPRO, FASTART, Registered United States Patent and
Trademark Office.
The software described in this guide is furnished under a license agreement
or nondisclosure agreement. The software may be used or copied only in
accordance with the terms of the agreement.
Product names mentioned herein are for identification purposes only and may
be trademarks and/or registered trademarks of their respective companies.
COMPAQ PORTABLE II PERSONAL COMPUTER
MAINTENANCE AND SERVICE GUIDE
Second Edition (December 1990)
First Edition (February 1986)
Manual Assy No. 101206-002
Text PN 104208-002
Binder PN 104207-001
Preface
This publication is intended as a reference for technicians trained to repair
the COMPAQ PORTABLE II Personal Computer.
Summary of Text
This guide contains the following eight chapters:
Chapter 1, "Operating and Performance Specifications," provides physical,
environmental, and performance specifications for the COMPAQ PORTABLE II
Personal Computer.
Chapter 2, "Power On Self Test," describes the internal system diagnostic
programs that execute automatically when the system is turned on. It also
includes a quick reference for identifying and correcting problems that could
occur during the Power On Self Test procedure.
Chapters 3 and 4: Please see the SUPPORT SOFTWARE MAINTENANCE AND SERVICE
GUIDE for information on the SETUP and ADVANCED DIAGNOSTICS programs.
Chapter 5, "Error Messages and Codes," lists the Power On Self Test (POST) and
DIAGNOSTICS Error Codes and provides the course of action necessary to
resolve the problem.

Chapter 6, "Illustrated Parts Catalog," provides an illustrated reference for
COMPAQ PORTABLE II Personal Computer spare parts.
Chapter 7, "Removal and Replacement Procedures," describes how to remove and
replace field replaceable subassemblies.
Chapter 8, "Jumper Settings, Switch Settings, and Adjustments," provides
detailed information for setting jumpers and switches and performing monitor
adjustments.
Tools and Supplies
The following tools and supplies are required to service the COMPAQ PORTABLE
II Personal Computer:
o Torx screwdrivers, sizes T-15 and T-10
o Slotted blade screwdriver, 1/4 inch
o Needlenosed pliers
o 25 pin printer loopback plug
o 25 pin serial loopback plug
o 9 pin serial loopback plug
o DIAGNOSTICS diskette
o Formatted diskette
Optional Tools
o Memory chip insertion tool
o Memory chip removal tool
o Diskette drive signal extension cable (PN 100546-001)
o Diskette drive power extension cable (PN 100545-001)
o Socket/Torx tool kit (PN 101089-001)
- Torx screwdrivers, sizes T-15 and T-10
- Adjustable socket tool with hex sockets and one Torx socket (T-10)
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
CAUTION
Only trained technicians should attempt to repair this equipment. All
troubleshooting and repair procedures are detailed to allow
subassembly/module level repair only.
Because of the complexity of the individual boards and subassemblies, no one
should attempt to make repairs at the component level or make modifications
to any printed wiring board. Improper repairs may create a safety hazard.
Indications of component replacement or printed wiring board modifications
may void any warranty or exchange allowances.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Additional Reference Information
The following support documentation is available for the COMPAQ PORTABLE II

Personal Computer.
o Operations Guide
o MS-DOS VERSION 3 REFERENCE GUIDE
o Technical Reference Guide
o HOW TO DO BUSINESS WITH COMPAQ SERVICE
o COMPAQ SERVICE QUICK REFERENCE GUIDE
o COMPAQ Service Advisories and Bulletins
o COMPAQ QuickFind Support Reference Library
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
WARNING
The computer is designed to be electrically grounded. To ensure proper
operation of the computer, plug the AC power cord only into a properly
grounded AC outlet.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Compaq Computer Corporation requires all peripheral devices be connected to
this computer via shielded cables with metal RFI/EMI connector hoods.
WIRE TYPE: Multipaired, overall shielded; Belden #98XX; Alpha #54XX; or
equivalent.
CONNECTOR HOOD: RFI/EMI metal shield; AMP #7451 7X-X; or equivalent.
It is important that the chassis ground of any peripheral device be connected
to the computer chassis. An Alpha #1221 flat braid strap is sufficient.
This strap is not necessary if the shielded cable connects the two chassis.

Chapter 1. Operating and Performance Specifications
Chapter 1.0 Introduction
This chapter contains operating and performance specifications for the COMPAQ
PORTABLE II Personal Computer.
Chapter 1.1 System Unit
Table 1-1. Electrical and Mechanical Specifications
==============================================================================
Dimensions:
Height 7.5 in. (19.0 cm)
Depth 13.9 in. (35.3 cm)
Width 17.7 in. (45.0 cm)
------------------------------------------------------------------------------
Weight Model 1 23.6 lb (10.7 kg)
Model 2 25.6 lb (11.6 kg)
Model 3 26.2 lb (11.9 kg)
Model 4 26.3 lb (12.2 kg)
------------------------------------------------------------------------------
Power Requirements:
Voltage 120 VAC 220 - 240 VAC
Frequency 60 Hz 50 Hz
Current 3A 2.5A
------------------------------------------------------------------------------
AC Power Cable:
Length 79 in. (2 m)
Gauge 18 AWG
------------------------------------------------------------------------------
Environmental Requirements:
Temperature:
Operating 10oC to 40oC (50oF to 104oF)
Nonoperating 10oC to 60oC (50oF to 140oF)
Shipping -30oC to 60oC (-22oF to 140oF)
Humidity:
Operating 20% to 80% (noncondensing)
Nonoperating 5% to 90% (noncondensing
Shock:
Operating 5 g, 11 ms, half sine
Nonoperating 35 g, 11 ms, half sine
Vibration:
Operating 0.5 g, 5 - 550 Hz
Nonoperating 1.0 g, 5 - 550 Hz
Heat Dissipation:
Delivered 410 BTU/hr at 120W
Total Watts 615 BTU/hr at 180W
Maximum Unpressurized Altitude:
Operating 10,000 ft (3048 m)
Nonoperating 30,000 ft (9144 m)

==============================================================================
Chapter 1.2 Keyboard
Table 1-2. Keyboard Specifications
==============================================================================
Dimensions:
Height 1.3 in. (3.30 cm)
Depth 7.0 in. (17.78 cm)
Width 17.1 in. (43.43 cm)
Number of Keys 84
Keyboard:
Cable Length 60.00 in. (152.4 cm)
Coil Diameter 0.75 in. (1.9 cm)
Coil Length 11.00 in. (27.94 cm)
==============================================================================
Chapter 1.3 Video Display Unit
Table 1-3. Video Display Unit Specifications
==============================================================================
Display 9 in. diagonal
90 degree deflection
High persistence green phosphor
Etched surface to reduce glare
Display Size 80 character by 25 line screen
40 character by 25 line screen
Graphic Resolution 640 x 200 dot resolution
320 x 200 dot resolution
Text Resolution 720 x 350 dot resolution
==============================================================================
Chapter 1.4 10 Megabyte Fixed Disk Drive
Table 1-4. 10 Megabyte Fixed Disk Drive Specifications
==============================================================================
Dimensions:
Height 1.7 in. (4.32 cm)
Depth 5.80 in. (14.73 cm)
Width 3.75 in. (9.54 cm)
Weight 2.2 lb (1.0 kg)
Media: 1 Platter
Number of Data Heads 4
Number of Cylinders 306
Average Access Time 105 ms

Data Transfer Rate 5.0 Mb/s
Type 1
==============================================================================
Chapter 1.5 20 Megabyte Fixed Disk Drive
Table 1-5. 20 Megabyte Fixed Disk Drive Specifications
==============================================================================
Dimensions:
Height 1.7 in. (4.32 cm)
Depth 4.1 in. (10.41 cm)
Width 5.75 in. (14.61 cm)
Weight 1.8 lb (0.8 kg)
Media: 2 Platter
Number of Data Heads 4
Number of Cylinders 615
Average Access Time 105 ms
Data Transfer Rate 5.0 Mb/s
Type 2
==============================================================================
Chapter 1.6 360 KByte Diskette Drive
Table 1-6. 360 Kbyte Diskette Drive Specifications
==============================================================================
Dimensions:
Height 1.1 in. (2.85 cm)
Depth 7.9 in. (20.3 cm)
Width 5.9 in. (15.0 cm)
Weight 1.98 lb (0.9 kg)
Media:
Tracks per inch 48
Number of Tracks 40 (when formatted with MS-DOS)
Data Transfer Rate 250 Kb/s
==============================================================================
Chapter 1.7 1.2 Megabyte Diskette Drive
Table 1-7. 1.2 Megabyte Diskette Drive Specifications
==============================================================================
Dimensions:
Height 1.1 in. (2.8 cm)
Depth 8.0 in. (20.3 cm)
Width 5.8 in. (14.6 cm)
Weight 1.9 lb (0.9 kg)
Media:

Tracks per Inch 96 (1.2 megabyte format)
48 (360 Kbyte format)
Number of Tracks 80 (1.2 megabyte format)
40 (360 Kbyte format)
Data Transfer Rate 500 Kb/s (1.2 megabyte format)
300 Kb/s (360 Kbyte format)
==============================================================================
Chapter 1.8 1.44 Megabyte Diskette Drive Specifications
Table 1-8. 1.44 Megabyte Diskette Drive Specifications
==============================================================================
Dimensions:
Height 0.90 in. (2.3 cm)
Depth 6.47 in. (16.42 cm)
Width 5.95 in. (11.1 cm)
Weight 1.98 lb (0.9 kg)
Media:
Tracks per Inch 135
Number of Tracks 80
Data Transfer Rate 500 Kb/s (high density)
250 Kb/s (low density)
==============================================================================
Chapter 1.9 Power Supply
Table 1-9. Power Supply Specifications
==============================================================================
Input Requirements:
Line Voltage 102 to 132 VAC. single phase
180 to 264 VAC. single phase
3.0A fuse, 125 VAC for 120 VAC operations
2.5A fuse, 150 VAC for 220/240 VAC operation
Line Frequency 47 - 62 Hz
Cooling Forced air provided by internal 12 VDC fan
------------------------------------------------------------------------------
Volts Direct Current Output
Nominal Maximum
Nominal Current Continuous Peak Regulation
Voltage Amperes Current Current Tolerance
(VDC) Minimum (Amperes) Maximum * (Amperes) Percentage
------------------------------------------------------------------------------
+5.0 3.0 13.9 13.9 ñ2
-5.0 0.0 0.5 0.5 ñ5
+12.2 1.0 4.0 7.0 ñ2
-12.0 0.0 0.5 0.5 ñ5
------------------------------------------------------------------------------
* These values are maximum values based on nominal operating conditions for
temperature, line voltage, frequency and altitude. Also, a minimum load on
l2 VDC must be maintained for proper power supply operation.
==============================================================================

Chapter 2. Power On Self Test/Problem Isolation
2.1 Power On Self Test
The Power On Self Test (POST) is a series of diagnostic tests performed
automatically when the system is turned on. These tests verify that the
computer system is operating properly. If a subassembly fails POST, an error
code appears on the screen.
To start POST, follow these steps.
1. Turn off the computer.
2. Disconnect the signal cables of any peripheral devices (printers, modems,
and so on) from the computer.
3. Remove the outer access casing to expose the system LED located on the
system board (see Chapter 7 for this procedure).
4. Install a loopback plug connector at each location from which a
peripheral signal cable was removed.
NOTE: To test your printer during the printer test or to log errors to a
printer, reconnect the printer now.
5. Verify that the AC power cable is connected to a usable, grounded, three
pronged AC power outlet.
6. Insert the DIAGNOSTICS diskette into drive A.
7. Turn on the computer. The system automatically runs POST. See
Section 2.2, "System Problem Isolation," for information on handling
system problems.
Chapter 2.2 System Problem Isolation
This section contains problem isolation procedures for identifying and
correcting system related problems.
To isolate system problems, perform the following steps:
1. Verify that the AC power switch is on.
2. Listen for the sound of the fan. Did you hear the fan?
YES: Proceed to step 3.
NO: Turn off the computer and check the condition of the AC power fuse.
Is the fuse good?
YES: Return the AC power fuse to its fuse holder and turn on the system.
Proceed to step 3.

NO: Replace the AC power fuse (refer to Chapter 7 in this guide
for AC power fuse removal and replacement information). Repeat
steps 1 and 2.
3. Did you hear an audible beep or see an error code on the screen?
YES: See Chapter 5, "Error Messages and Codes" for information on how to
identify and correct either audible or error code related problems.
NO: Proceed to step 4.
4. Check the system LED on the system board. Is it lit?
YES: Proceed to step 5. If you did not hear the fan, replace it now.
NO: Replace the power supply subassembly chassis and repeat the problem
isolation procedures.
If the problem continues, replace the system board and repeat the problem
isolation procedures.
If the problem has not been corrected, test each controller or option board
by turning off the system, removing a board and turning the power back on.
If the LED is still not on, test each video and storage device by turning off
the system, disconnecting the device power cable and then turning on the
system.
When the system LED lights, power off the system and replace the defective
subassembly.
NOTE: For removal and replacement procedures, refer to Chapter 7.
5. Check the screen for a blinking cursor. Do you see a cursor on the
screen?
YES: Proceed to step 6.
NO: Listen for an audible tone (beep) from the system speaker.
If you hear one or two short beeps, POST is complete. The system now boots
the DIAGNOSTICS program. If the screen remains blank, adjust the brightness
knob.
If the display screen remains blank after adjusting the brightness knob, the
video display unit subsystem is not functioning properly.
o If a color graphics or composite video monitor is available, connect
either device to the correct video outputs on the video display controller
board. Using the CTRL + ALT + < command, change the display mode to the
graphics mode.
If the first screen of the DIAGNOSTICS program appears on the external
monitor, replace the internal video display unit.
If the screen on the external monitor is blank, replace the video display

controller board.
o If a color graphics or composite video monitor is not available, replace
the video display controller board.
o If a color graphics or composite video monitor is not available and
replacing the video display controller board does not solve the problem,
replace the internal video display unit.
If you do not hear a beep, replace the system board. If you hear any other
audible sounds, refer to Chapter 5 for more information on POST related error
messages.
6. Did the cursor disappear from the screen, replaced by the number of Kbytes
(shown in increments) on the display screen?
YES: This indicates the memory self test portion of POST. Proceed to
step 7.
NO: Replace the system board. Restart the system problem isolation
procedures.
7. Did the LEDs on the mass storage device flash, followed by one or two
short beeps?
YES: This indicates that POST and the SETUP utility have completed
successfully. The DIAGNOSTICS program should then boot and the
DIAGNOSTICS menu should appear on the display screen.
Refer to Chapter 4 for additional information on the COMPAQ
DIAGNOSTICS program.
NO: If the cursor reappears and remains on the screen, replace
the system board.
If one audible tone is heard and an error message appears, the SETUP
function was not completed on the system. Press the F1 key and
proceed to Chapter 3 in this guide for information on the SETUP
function.