Compaq presario 1230, presario 1250, 1234, 1235, 1236 schematic

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Before You Begin

Notice
Preface
Product

Description
Troubleshooting
Illustrated Parts

Catalog

Index

Removal &
Replacement
Procedures

Specifications
Connector Pin

Assignments
Battery Pack

Operations

Welcome to the Maintenance & Service Guide
(MSG). This online guide is designed to serve the
needs of those whose job it is to repair Compaq
products. Many of the components of the hardcopy
MSG are contained in this online guide. The

contains the copyright and trademark information.
The

Notes and Serial Number locations on the unit.

This MSG will be periodically maintained and
updated online as needed.

For content comments or questions, contact

Support.

Preface shows symbol conventions, Technician

Notice,

Tech

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

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.

Ó 1998 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.

Compaq, Presario Registered U. S. Patent and Trademark Office.

Microsoft, MS-DOS, and Windows are registered trademarks of Microsoft Corporation.
Windows 95 is a trademark of Microsoft 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 Presario 1200 Series Portable Computers

First Edition (August 1998)
Compaq Computer Corporation

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Preface

This Maintenance and Service Guide is a troubleshooting guide that can be used for reference when
servicing the Compaq Presario 1200 Series Portable Computers.

Compaq Computer Corporation reserves the right to make changes to the Compaq Presario 1200
Series Portable Computers without notice.

Symbols

The following words and symbols mark special messages throughout this guide.

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.

Text set off in this manner presents commentary, sidelights, or interesting points of

NOTE:

information.

Technician Notes

WARNING: Only authorized technicians trained by Compaq should 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,
the user should not attempt to make repairs at the component level or to make modifications to any printed circuit board. Improper
repairs can create a safety hazard. Any indications of component replacement or printed circuit board modifications may void any
warranty

Serial Number

When requesting information or ordering spare parts, the computer serial number should be
provided to Compaq. The serial number is located on the bottom of the computer.

Locating Additional Information

The following documentation is available to support this product:

● Compaq Presario 1200 Series Portable Computer documentation set

● Introducing Windows 95 Guide

● Service Training Guides

● Compaq Service Advisories and Bulletins

● Compaq QuickFind

● Compaq Service Quick Reference Guide

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Product Description

Models and
Features

Controls and
Lights

Left Side
Components

Right Side
Components

Bottom of
Unit

Index

Compaq
Presario
Portable
Computer,
the new
generation
of
multimedia
portables,
presents
innovative
integrated
design,

Rear
Connectors

Power
Management
for Windows
98

outstanding
audio and
video,
advanced
core
features,
and
attractive
styles. This
fully
functional
AMD-K6 or
Pentium­based
portable
computer
allows full
desktop
versatility.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Models and Features

Models and
Features

Controls and
Lights

Left Side
Components

Right Side
Components

Display
Processor
Hard Drive
CD Drive
Modem

Index

Compaq Presario 1200 Series Portable Computer Models

Model
1234

12. 1" HPA 12. 1" HPA or 12. 1" TFT

AMD-K6 266 MMX AMD-K6 266 MMX

3.2-GB 4.0-GB or 3.2-GB
24× MAX 24× MAX
M++56.0 Kbps Data/Fax with

Model
1235

K-56.0 Kbps Data/Fax with ITU

Bottom of
Unit

Rear
Connectors

Power
Management
for Windows
98

Battery

Display
Processor
Hard Drive
CD Drive
Modem

Battery

ITU V.90
ES NiMH ES NiMH or Li ion

Model
1236

12. 1" TFT 12. 1" TFT

AMD-K6 266 MMX AMD-K6 266 MMX

4.0-GB 4.0-GB
24× MAX 24× MAX
K-56.0 Kbps Data/Fax with ITU

V.90
Li ion Li ion

V.90

Model
1237

K-56.0 Kbps Data/Fax with ITU
V.90

Models and Features (continued)

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Models and Features

Display
Processor

Hard Drive
CD Drive

Model
1238

12. 1" HPA 12. 1" HPA or 12. 1" TFT
AMD-K6 266 MMX Pentium 266MMX

4.0-GB 3.2-GB or 4.0-GB
24× MAX 24× MAX

Index

Model
1240

Modem

Battery

Display
Processor
Hard Drive
CD Drive
Modem

Battery

K-56.0 Kbps
Data/Fax with ITU V.90

Li ion ES NiMH or Li ion

Model
1242

12. 1" TFT 12. 1" TFT
Pentium 266MMX AMD-K6 300 MMX

3.2-GB 6.4-GB
24× MAX 24× MAX
M++56.0 Kbps

Data/Fax with ITU V.90
Li ion Li ion

M++56.0 or K-56.0 Kbps
Data/Fax with ITU V.90

Model
1250

K-56.0 Kbps
Data/Fax with ITU V.90

Display
Processor
Hard Drive
CD Drive
Modem

Battery

Model
1252

12. 1" TFT
AMD-K6 300 MMX

4.0-GB
24× MAX
K-56.0 Kbps Data/Fax with

ITU V.90
Li ion

Return to Models and Features Page

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Controls and Lights

Models and
Features

Controls
and Lights

Left Side
Components

Right Side
Components

Bottom of

Index

Front of Unit

1. Display 7. Easy Access
Internet Button

2. Power (On/Off)

Button

3. Keyboard 9. Microphone

8. Headphone
Jack (Left)

Jack (Right)

Unit
Rear

Connectors
Power

Management
for Windows
98

Front
Bezel
Lights

4. Touch Pad 10. Volume
Control Up
Button

5. Touch Pad

Button (Left)

6. Volume Control

Down Button

11. Integrated
Speakers

12. Touch Pad
Button (Right)

Front Bezel Lights

1. Power
Light

3. Power
Cord Light

2.Battery
Light

4. Num Lock
Light

5. Cap Lock
Light

6. Scroll
Light

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Left Side Components

Models and
Features

Controls and
Lights

Left Side
Components

Right Side
Components

Bottom of

Index

Left Side

Components

1. PC
Card
Eject
Lever

2. PC
Card
Slot

3.
Diskette
Drive
Slot

4.
Diskette
Eject
Button

Unit
Rear

Connectors
Power

Management
for Windows
98

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Right Side Components

Models and
Features

Controls and
Lights

Left Side
Components

Right Side
Components

Index

Right Side Components

1. Battery
Compartment

2. CD Drive

3. CD Drive
Eject Button

Bottom of
Unit

Rear
Connectors

Power
Management
for Windows
98

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Bottom of Unit

Models and
Features

Controls and
Lights

Left Side
Components

Right Side
Components

1. Memory
Compartment

Index

Bottom of Unit

2. Feet

Bottom of
Unit

Rear
Connectors

Power
Management
for Windows
98

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Rear Connectors

Models and
Features

Controls and
Lights

Left Side
Components

Right Side
Components

Index

Rear Connectors

1. AC Adapter 6. USB

2. Parallel Printer
Port

3. Serial Port 8. Modem Jack

4. Fan Exhaust 9. Security Slot

5. External Monitor
Port

7.Keyboard/Mouse
Port

Bottom of
Unit

Rear
Connectors

Power
Management
for Windows
98

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Power Management for Windows 98

The following power management features are available for conserving AC power and extending
battery operating time:

● Power Management Settings

● Sleep

● Hibernation

● Battery operating time

● Rebooting After a Lockup

● Servicing Your Computer - Full Off Mode

Power Management Settings

Depending on your patterns of computer use, you can set different levels of power management.
These different power management levels can be activated based on the amount of time passed
since the last system activity. System activity examples include keyboard or mouse movement, CD
or DVD playback (while under program control that monitors Sleep), and modem use.

You can select different conditions or power schemes through Power Management.The optional
settings are Home/Office Desk, Portable/ Laptop, and Always On. From the default settings,
you can change the following settings:

● the System goes to Sleep (Standby) mode

● the screen times out and goes blank

● the hard drive spins down

Each of these system components will go to sleep after the selected or default periods of inactivity.
(The setting for hard drive must be less than or equal to the setting for System.)

If you're on a network, it's recommended that you set System Standby to

IMPORTANT:

Never.

There are five categories of power management settings under the Control Panel. The default
setting for each feature is listed below in the tables.

Power Management Properties

Tab: Power Schemes: Plugged in Running on

Batteries

Always on System
Standby:

Turn OFF Monitor

Never 15 minutes

After 15 minutes After 10 minutes

Always on System

After 15 minutes After 10 minutes

Standby:

Power Management Properties

Tab: ALARMS::
Low Battery Alarm: 10%
Critical Battery Alarm 0%
Alarm Actions: X Display Message Notification

Text Action No Action

Power Management Properties

Tab: POWER METER: Default
Tab: ADVANCED Default

Display Properties

Tab: Monitor: Laptop Display (Maximum resolution according to unit display
size)

Sleep

You can select Sleep mode instead of turning off the computer when you have finished using it.
This allows the computer to wake up faster than turning it completely off and saves power over the
active (On) mode. Compaq Presario Notebook computers have two levels of sleep, Hibernation and
Sleep.

Hibernation - by pushing the power button once your computer will perform a save to disk
followed by a shut down of the computer into Off mode.

Sleep - is a low power mode, also referred to as Standby mode. While in Sleep mode, your
computer will maintain system information and open files. Unsaved information will be lost if you
turn off your system prior to system wake-up, or if you lose power while using the AC adapter.

CAUTION: While in Sleep mode, your computer will maintain system information and open

files. Unsaved information will be lost if you turn off your system prior to system wake­up, or if you lose power while using the AC adapter.

Hibernation Mode

Hibernation helps conserve battery life and protects your data. Hibernation can be a routine power
saving event, or can be the result of a low battery condition. As it enters Hibernation your
computer will display a progress screen, as it automatically saves the machine state before it shuts
down and turns itself off. Your computer will automatically go into Hibernation, when the battery
has little power left, or when the system (operating on battery power) has been in Sleep mode for
more than an hour. You can also manually initiate Hibernation by pressing the power button once
while the system is active. To restore the computer's previous state, simply press the power button
once again. While waking up, the computer will display a progress screen.

The following table shows the conditions and indicators for getting in and out of the various power
management modes, Sleep, Hibernation, and Off.

Mode To Initiate To End Indicators

Sleep

Manual keys

Press any key Flashing green

combination

- Fn+F4

Time Out
Default 15
minutes. If on
Battery power
(system will not
go to Sleep if
on AC power)

Hibernate Manual - Press

Power Button
once

Time Out
Default If low

Press Power
Button once

Power LED

No Power LED,
blank screen

battery or after
1 hour of sleep
(system will not
Hibernate if on
AC power)

Off Perform normal

Windows
shutdown via
the start
button, or press
and hold down
the power
button for 4
seconds

Press Power
Button once

No Power LED,
blank screen

Servicing Your Computer - Full Off Mode

If you need to install or replace components in your system, you must turn the computer off
completely. Follow the instructions above for properly putting the computer into Off mode, unplug
from the outlet, and remove the battery (see battery section for instruction on removing battery).

Rebooting After a Lockup

Occasionally you may encounter a frozen keyboard or a locked screen. To reboot your computer
(as if from a cold start) press and hold down the Power Button for at least four seconds, which will
cause a manual shutdown. Then, restart it with a single press of the Power Button. If it still doesn't
recover, press the Power Button and hold it for four seconds to shut it down, then, remove the
battery or unplug the AC power for at least 30 seconds. Reinsert the battery or reconnect AC
power and press the Power Button once to reboot.

Battery Operating Time

Battery operating time is affected by variables, such as the following:

● Power conservation settings

● Hardware configuration

● Software applications

● Installed options

● Display brightness

● Hard drive usage

● Power button

● Changes in operating temperature

● Type and number of installed PC Cards

For more information on increasing battery pack operating time, conditioning the battery pack, and
disposing of a used battery pack, refer to the

Battery Pack Operations.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Preliminary Steps

This section covers troubleshooting information for
the Compaq Presario 1200 Series Portable

Clearing the Power­On Password

Computers. The basic steps in troubleshooting
include:

Power-On Self Test
(POST)

Compaq Diagnostics
Diagnostic Error

1. Follow the Preliminary Steps.

2. Run the Power-On Self-Test
(POST).

Codes

Index

Troubleshooting
Without Diagnostics

Solving Minor
Problems

Contacting Compaq
Support

3. Follow the recommended
actions described in the
diagnostic tables, if you are
unable to run POST or if POST
displays an error message.

When following the
recommended actions in the
Sections on POST and

Diagnostic Error Codes perform

them in the order listed. Rerun
POST after each recommended
action until the problem is
solved and no error message
occurs. Once the problem is
solved, do not complete the
remaining recommended
actions.

If the problem is
intermittent, check the

NOTE:

computer several times
to verify that the problem
is solved.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Preliminary Steps

Before running POST, complete the following preliminary steps:

1. If a power-on password has been established, type the password and press the Enter key. If
the password is not known,

2. Run Computer Checkup.

3. Turn off the computer and its external devices.

4. Disconnect any external devices that you do not want to test. Do not disconnect the printer if
you want to test it or use it to log error messages.

clear the password.

If the problem only occurs when an external device is connected
to the computer, the problem may be related to the external

IMPORTANT:

device or its cable. Verify this by running POST with and without
the external device connected.

5. Install loopback plugs in the serial and parallel connectors if you would like to test these ports.

6. Ensure the hard drive is installed in the computer.

7. Ensure that the battery pack is inserted in the computer and the computer is connected to an
external AC power source.

When the preliminary steps are completed, you are ready to run

POST.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Power-On Self Test (POST)

Running POST

To run POST, complete the following steps:

Turn off the computer, then turn on the computer.

If POST does not detect any errors, the computer will not beep. This indicates successful
completion of POST test. POST has run successfully and boots from the hard drive (or from a
bootable diskette if one is installed in the diskette drive).

If POST detects errors, the errors are indicated by screen and/or audible messages. Refer to
"Power-On Self-Test (POST) Codes" in the tables for a list of POST codes and their relevant
descriptions.

If the system is not functioning well enough to run POST, or if the display is not functioning

NOTE:

well enough to show POST error messages, refer to the Troubleshooting tables.

Power-On Self-Test Messages

102-System Board Failure

Probable Cause Recommended Action

DMA, timers, etc. Replace the system board.

162-System Options Not Set

Probable Cause Recommended Action

Configuration incorrect Run Computer Setup.
CMOS reflects that an invalid

configuration has been set.
RAM failure 1. Replace the memory modules.

Memory test data error 1. Replace the memory modules.

XX000YZZ RAM failure Replace the system board.

XX000YZZ 201-Memory Error

Run Computer Setup.

2. Replace the system board.

2. Replace the system board.

Probable Cause Recommended Action

301-Keyboard Error

Probable Cause Recommended Action
Keyboard failure 1. Ensure the keys are not depressed during POST.

2. Reconnect the keyboard with the computer off.

3. Replace the keyboard.

304-Keyboard or System Unit Error

Probable Cause Recommended Action
Keyboard or system board error 1. Replace the keyboard.

2. Replace the TouchPad or mouse.

3. Replace the system board.

601-Diskette Controller Error

Probable Cause Recommended Action
Mismatch in drive type or failure in the

diskette controller

605-Diskette Drive Error

Probable Cause Recommended Action
Mismatch in drive type Run Computer Setup.

1780-Primary Hard Drive 0 Failure

Probable Cause Recommended Action

1. Run Computer Checkup (TEST).

2. Check and/or replace cables.

3. Replace the system board.

Disk 0 failed to respond 1. Run Computer Checkup (TEST).

2. Replace the hard drive.

Hard drive format error 1. Run Computer Checkup (TEST).

2. Replace the hard drive.

1782-Hard Drive Controller

Probable Cause Recommended Action
Hard drive controller failure 1. Run Computer Setup.

2. Replace the hard drive.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Diagnostic Error Codes

Diagnostic error codes occur if the system recognizes a problem while running the Compaq
Diagnostic program. These error codes help identify possibly defective subassemblies.

The following tables list error codes, a description of the error condition, and the action required
to resolve the error condition.

IMPORTANT:

For the removal and replacement of a particular subassembly, see

Procedures.

Retest the system after completing each step. If the problem has been resolved,
do not proceed with the remaining steps.

Removal and Replacement

Select error codes by number or type:

101 through 114 Processor Test
200 through 215 Memory Test
300 through 304 Keyboard Test
401 through 403 Parallel Printer Test
600 through 699 Diskette Drive Test
1101 Serial Test
1701 through 1736 Hard Drive Test
501 through 516 Video Test
2402 through 2456
2458 through 2480
3206 Audio Test
8601 through 8602 Touch Pad Pointing Device Test
3301 through 6623 CD Test

Processor Test Error Codes
Error

Code Description Recommended Action

101-xx CPU test failed Replace the processor and retest.
102-xx Coprocessor or Weitek Error 1. Run the Configuration and Diagnostics

Utilities.

2. Replace the processor board and retest.
103-xx DMA page registers test failed Replace the system board and retest.
104-xx Interrupt controller master test failed
105-xx Port 61 error
106-xx Keyboard controller self-test failed
107-xx CMOS RAM test failed
108-xx CMOS interrupt test failed
109-xx CMOS clock test failed
110-xx Programmable timer load data test

failed
113-xx Protected mode test failed
114-01 Speaker test failed 1. Check system configuration.

2. Verify cable connections to speaker.

3. Replace the system board and retest.

Memory Test Error Codes

200-xx Memory machine ID test failed 1. Flash the system ROM and retest.
202-xx Memory system ROM checksum failed
203-xx Write/Read test failed 1. Remove the memory module and retest.
204-xx Address test failed
211-xx Random pattern test failed
214-xx Noise test failed
215-xx Random address test failed

Keyboard Test Error Codes

300-xx Failed ID Test 1. Check the keyboard connection. If
301-xx Failed Selftest/Interface Test

2. Replace the system board and retest.

2. Install a new memory module and
retest.

disconnected, turn off the computer and

connect the keyboard.
302-xx Failed Individual Key Test
304-xx Failed Keyboard Repeat Test

Parallel Printer Test Error Codes

401-xx Printer failed or not connected 1. Connect the printer.

402-xx Failed Port Test

403-xx Printer pattern test failed

Diskette Drive Test

600-xx
601-xx Diskette format failed

602-xx Diskette read test failed
603-xx

Diskette ID drive types test
failed

Diskette write, read, compare test
failed

2. Replace the keyboard and retest.

3. Replace the system board and retest.

2. Check power to the printer.

3. Install the loop-back connector and

retest.

4. Check port and IRQ configuration.

5. Replace the system board and retest.

1. Replace the diskette media and retest.

2. Check and/or replace the diskette power

and signal cables and retest.

3. Replace the diskette drive and retest.

4. Replace the system board and retest.

604-xx Diskette random read test failed
605-xx Diskette ID media failed
606-xx Diskette speed test failed
609-xx Diskette reset controller test failed
610-xx Diskette change line test failed
697-xx Diskette type error
698-xx Diskette drive speed not within limits

Diskette drive/media ID error 1. Replace media.

699-xx

Serial Test Error Codes

1101-xx

1701-xx Hard drive format test failed 1. Run the Configuration and Diagnostics
1702-xx Hard drive read test failed

1703-xx
1704-xx Hard drive random seek test failed

Serial port test failed 1. Check port configuration

Hard Drive Test Error Codes

Hard drive write/read/compare test
failed

2. Run the Configuration and Diagnostics

Utilities.

2. Replace the system board and retest.

Utilities and verify drive type.

2. Verify that all secondary drives have

secondary drive capability.

3. Replace the hard drive and retest.

4. Replace the system board and retest.

1705-xx Hard drive controller test failed
1706-xx Hard drive ready test failed
1707-xx Hard drive recalibration test failed
1708-xx Hard drive format bad track test failed
1709-xx Hard drive reset controller test failed
1710-xx Hard drive park head test failed
1715-xx Hard drive head select test failed

1716-xx
1717-xx Hard drive ECC* test failed

1719-xx Hard drive power mode test failed
1724-xx Network preparation test failed
1736-xx Drive monitoring test failed
* ECC = Error Correction Code

Hard drive conditional format test
failed

Video Test Error Codes

501-xx Video controller test failed The following apply to error codes 501-xx
502-xx Video memory test failed
503-xx Video attribute test failed
504-xx Video character set test failed

505-xx

506-xx
507-xx Video 40 × 25 mode test failed
508-xx

509-xx
510-xx Video 640 × 200 mode test failed

511-xx Video screen memory page test failed
512-xx Video gray scale test failed

Video 80 × 25 mode 9 × 14 character
cell test failed

Video 80 × 25 mode 8 × 8 character
cell test failed

Video 320 × 200 mode color set 0
test failed

Video 320 × 200 mode color set 1
test failed

through 516-xx:

1. Disconnect external monitor and test

with internal LCD display.

2. Replace the display assembly and retest.

3. Replace the system board and retest.

514-xx Video white screen test failed
516-xx Video noise pattern test failed
2402-xx Video memory test failed The following steps apply to error codes
2403-xx Video attribute test failed
2404-xx Video character set test failed

2405-xx

2406-xx

2408-xx

2409-xx
2410-xx Video 640 × 200 mode test failed

2411-xx Video screen memory page test failed
2412-xx Video gray scale test failed

Video 80 × 25 mode 9 × 14 character
cell test failed

Video 80 × 25 mode 8 × 8 character
cell test failed

Video 320 × 200 mode color set 0
test failed

Video 320 × 200 mode color set 1
test failed

2402-xx through 2456-xx:

1. Run the Configuration and Diagnostics

Utilities.

2. Replace the display assembly and retest.

3. Replace the system board and retest.

2414-xx Video white screen test failed

2416-xx Video noise pattern test failed

2418-xx ECG/VGC memory test failed

2419-xx ECG/VGC ROM checksum test failed 1. Run the Configuration and Diagnostics

Utilities.
2421-xx ECG/VGC 640 × 200 graphics mode

test failed

2422-xx ECG/VGC 640 × 350 16 color set test

failed

2423-xx ECG/VGC 640 × 350 64 color set test

failed

2424-xx ECG/VGC monochrome text mode test

failed

2. Disconnect external monitor and test

with internal LCD display.

3. Replace the display assembly and retest.

4. Replace the system board and retest.

2425-xx ECG/VGC monochrome graphics mode

test failed

2431-xx 640 × 480 graphics test failure

2432-xx 320 × 200 graphics (256 color mode)

test failure

2448-xx Advanced VGA Controller test failed

2451-xx 132-column Advanced VGA test failed

2456-xx Advanced VGA 256 Color

test failed

2458-xx Advanced VGA BitBLT test The following step applies to error codes

2458-xx through 2480-xx:
2468-xx Advanced VGA DAC test

Replace the system board and retest.
2477-xx Advanced VGA data path test

2478-xx Advanced VGA BitBLT test

2480-xx Advanced VGA LineDraw test

Audio Test Error Codes

3206-xx Audio System Internal Error Replace the system board and retest.

TouchPad/Pointing Device Interface Test Error Codes

8601-xx Mouse test failed 1. Replace the TouchPad and retest.

2. Replace the system board and retest.

8602-xx Interface test failed

CD Drive Test Error Codes

3301-xx CD drive read test failed 1. Replace the CD and retest.

2. Verify that the speakers are connected.

3305-xx CD drive seek test failed

6600-xx ID test failed

6605-xx Read test failed

6608-xx Controller test failed

6623-xx Random read test failed

3. Verify that drivers are loaded and

properly installed.

4. Replace the CD drive and retest.

5. Replace the system board and retest.

Back to top

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Compaq Diagnostics

Compaq Diagnostics is installed on the hard drive of the computer. Run the
Diagnostics utilities when you want to view or test system information and if
you have installed or connected devices. If you run Compaq Diagnostics from
a diskette, ensure that it is version 10.11 or later.

The Diagnostics menu includes the following utilities:

■ Computer Checkup (TEST)

■ View System Information (INSPECT)

■ Prepare Computer for a Compaq Service Call (RemotePaq)

If you have a problem you cannot solve, run the Diagnostics utilities before
you call for support. Run Computer Checkup and select to save the device list
to a file and to print or to save the log of errors. Run the View System
Information (INSPECT) utility and select to print or to save that information.
Have the files or the printed information available when you call for support.

Computer Checkup (TEST)

Computer Checkup (TEST) determines whether the various computer
components and devices are recognized by the system and are functioning
properly. You can display, print, or save the information generated by
Computer Checkup.

Follow these steps to run Computer Checkup:

1. Plug the computer into an external power source. (A low battery condition
could interrupt the program.)

2. Turn on the external devices that you want to test. Connect the printer if
you want to print a log of error messages.

3. Insert the Compaq Diagnostics diskette in drive A.

4. Turn on or restart the computer. The computer starts from drive A, and the
Diagnostics Welcome screen appears.

5. Press Enter to continue. The Diagnostics menu appears.

6. Select Computer Checkup from the Diagnostics menu. A Test Option
menu appears.

7. Select View the Device List from the Test Option menu. A list of the
installed Compaq devices appears.

8. If the list of installed devices is correct, select OK. The Test Option menu
appears.

If the list is incorrect, ensure that any new devices are installed

NOTE:

properly.

9. Select one of the following from the Test Option menu:

■ Quick Check Diagnostics. Runs a quick, general test on each device with

a minimal number of prompts. If errors occur, they display when the
testing is complete. You cannot print or save the error messages.

■ Automatic Diagnostics. Runs unattended, maximum testing of each

device with minimal prompts. You can choose how many times to run
the tests, to stop on errors, or to print or save a log of errors.

■ Prompted Diagnostics. Allows maximum control over testing the devices.

You can choose attended or unattended testing, decide to stop on
errors, or choose to print or save a log of errors.

10. Follow the instructions on the screen as the devices are tested. When
testing is complete, the Test Option menu appears.

11. Exit the Test Option menu.

12. Exit the Diagnostics menu.

View System Information (INSPECT)

The View System Information (INSPECT) utility provides information about
the computer and installed or connected devices. You can display, print, or
save the information.

Follow these steps to run View System Information (INSPECT) from the
Compaq Diagnostics diskette:

1. Turn on the external devices that you want to test. Connect the printer if
you want to print the information.

2. Insert the Compaq Diagnostics diskette in drive A.

3. Turn on or restart the computer. The computer starts from drive A, and the
Diagnostics Welcome screen appears.

4. Press Enter to continue. The Diagnostics menu appears.

5. Select View System Information (INSPECT) from the Diagnostics
menu.

6. Select the item you want to view from the following list:

System Memory
ROM Audio
Keyboard Operating system
System ports System files
System storage Windows files
Graphics

7. Follow the instructions on the screen to cycle through the screens, to
return to the list and choose another item, or to print the information.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Contacting Compaq Support

Obtain the following information before contacting Compaq Reseller Support:

● Product name

● Product serial number

● Purchase date

● Conditions under which the problem occurred

● Any error messages that have occurred

● Hardware configuration

● Type of printer connected

● Hardware/software being used

● Printed result of Computer Checkup (TEST)

● Printed copies of CONFIG.SYS and AUTOEXEC.BAT files, if possible

Shipping Preparation

To ship the computer, complete the following steps:

1. Back up the critical hard drive files. Ensure that backup tapes/diskette are
not exposed to electrical or magnetic fields while stored in transit.

2. Turn off the computer and external devices.

3. Disconnect the external devices from their power sources, then from the
computer.

IMPORTANT:

4. Close the display and all exterior doors of the computer.

Ensure that there is no diskette in the diskette drive and that
there are no PC Cards in the PC slots.

5. Pack the computer with sufficient packing material to protect it. Use the
original packing box or similar packaging.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Troubleshooting Without Diagnostics

This section provides information about how to identify and correct some common hardware, memory, and software
problems. It also explains several types of common messages that may be displayed on the screen. The following pages
contain troubleshooting information on:

Audio Memory
Battery/Battery gauge PC Card
CD drive Power
Diskette/Diskette drive Printer
Display Touch Pad
Hard drive Keyboard/Numeric keypad
Hardware Installation

Since symptoms can appear to be similar, carefully match the symptoms of the computer malfunction against the problem
description in the Troubleshooting tables to avoid a misdiagnosis.

WARNING: To avoid a potential shock hazard during troubleshooting procedures, disconnect all power sources

before removing the keyboard cover or the display bezel.

Before Replacing Parts

Verify that cables are connected properly to the suspected defective parts.

■ Run Computer Setup after connecting external devices.

■ Verify that all required device drivers are installed.

■ Verify that all required changes have been made to the CONFIG.SYS file.

■ Verify that all required changes have been made to the AUTOEXEC.BAT file.

■ Verify that all printer drivers have been installed for each application.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Solving Minor Problems

Some minor problems and possible solutions are outlined in the following tables. If the problem
appears related to a software application, check the documentation provided with the software.

Solving Audio Problems

Some common audio problems and solutions are listed in the following table.

Solving Audio Problems

Problem Probable Cause Solution(s)

Computer does not beep after the Power-On
Self-Test (POST).

This is typical; it indicates successful
completion of the Power-On Self-Test
(POST).

No action is required.

Solving Battery Pack and Battery Gauge Problems

Some common causes and solutions for battery pack problems are listed in the following table. The
"Solving Power Problems" section in this chapter may also be applicable.

Solving Battery Pack and Battery Gauge Problems

Problem Probable Cause Solution(s)

Computer won't turn on when battery
pack is inserted and power cord is
unplugged.

Battery pack is discharged. Connect the computer to an external

power source and charge the battery
pack.

Replace the battery pack with a fully
charged battery pack.

Check the battery connectors on the
system board to verify they are evenly
spaced and that they are not bent or
broken.

Computer is beeping and battery LED
icon is blinking.

Computer battery LED icon (front on the
unit) blinks to indicate low battery
condition, but computer does not beep.

Battery LED icon doesn't light and
battery pack won't fast charge.

Battery charge is low. Immediately save any open file(s). Then

do any one of the following:

● Connect the computer to an

external power source to charge
the battery pack.

● Turn off the computer or initiate

Hibernation until you can find
another power source or charge
the battery pack.

Volume is turned down too low. Adjust the volume.

Battery pack is already charged. No action is necessary.

Battery pack was exposed to
temperature extremes.

Battery pack is at end of its life. Replace battery pack.

Allow time for the battery pack to return
to room temperature.

You have to set the date and time every
time you turn on the computer.

Problem Probable Cause Solution(s)

Battery charge does not last as long
as expected.

RTC battery is dead. Replace the RTC battery.

Battery is being exposed to high
temperatures or extremely cold
temperatures.

Battery has partially self-discharged. Recharge the battery. Discharge the

Power management is disabled. Set a power management level in

An external device or PC Card is draining
the battery.

Keep the battery pack within the
recommended operating temperature
range 50° F to 104° F (10° C to 40° C)
or recommended storage range

-4° F to 86° F (-20° C to 30° C ).
Recharge the battery pack.

battery completely and then recharge it.

Computer Setup.
Turn off or disconnect external devices

when not using them.

Battery pack is warm to the touch
after charging.

Battery pack operating time is far
less than the documented average
operating time.

Normal warming has occurred due to
charging.

Power management is turned off or
disabled.

An external device or PC Card is draining
the battery.

Battery pack has partially self­discharged.

No action is required.

Enable power management in Computer
Setup and in Windows Power Properties.

Turn off or disconnect external devices
when not using them.

Condition the battery pack by fully
charging, fully discharging, then fully
recharging it.

To maintain the charge, leave battery
packs in the computer when it is
connected to external power.

If the computer is disconnected from
external power for more than two
weeks, remove battery packs from the
computer to reduce the discharge rate.

Battery pack is being exposed to high
temperatures or extremely cold
temperatures.

Keep the battery pack within the
recommended temperature ranges.
Operating: 50° F to 104° F
(10° C to 40° C)
Storage: -4° F to 86° F
(-20° C to 30° C )

Recharge the battery pack.

Solving CD Drive Problems

Some common causes and solutions for CD drive problems are listed in the following table.

Solving CD Drive Problems

Problem Probable Cause Solution(s)

CD drive cannot read a compact disc. Compact disc is upside down or is

improperly inserted in the CD drive.

CD is CD Plus or Pregap/Track 0 type. Cannot read these type CDs in 24x.

Open the CD loading tray, lay the
compact disc in it (label side up), then
close the tray.

Remove the CD.

Solving Diskette and Diskette Drive Problems

Some common causes and solutions for diskette and diskette drive problems are listed in the
following table.

Solving Diskette and Diskette Drive Problems

Problem Probable Cause Solution(s)

Diskette drive cannot write to a
diskette.

Diskette is write-protected. Disable the diskette's write-

protect feature or use a
diskette that is not write­protected.

Computer is writing to

the wrong drive.

Not enough space is left

Check the drive letter in the
path statement.

Use another diskette.

on the diskette.

Drive error has occurred. Run Computer Checkup from

the Compaq Diagnostics
diskette.

Diskette is not formatted. Format the diskette. At

the system prompt, enter

FORMAT A:

Diskette drive cannot read a
diskette.

The wrong type of diskette is
being used.

Use the type of diskette
required by the drive.

Diskette has a bad sector. Copy files to hard drive or

another diskette. Reformat bad
floppy.

Drive error has occurred. Run Computer Checkup from

the Compaq Diagnostics
diskette.

Diskette is not

formatted.

Format the diskette. At the
system prompt, enter

FORMAT A:

Cannot boot from diskette. Bootable diskette is not in

drive A.

Diskette Boot has incorrect

Put the bootable diskette in
drive A.

Run Computer Setup and set

setting in Computer Setup.

diskette as first to boot.

Solving Display Problems

This section lists some common causes and solutions for computer display and external monitor
problems.

You can perform a monitor self-test on an external VGA color or monochrome monitor by
disconnecting the monitor from the computer. To do so, complete the following steps:

1. Turn off the monitor.

2. Turn off the computer.

3. Disconnect the monitor signal cable from the computer.

4. Turn on the monitor and allow it to warm up for one minute.

The display should be white. A narrow black border may also appear on the left and right sides of
the display. Either of these displays indicates that the monitor is working properly.

Solving Display Problems

Problem Probable Cause Solution(s)

Screen is dim. Control for brightness or

contrast (if applicable) is not
set properly.

Adjust the Brightness of the
display by using Fn + F7 (¯ )
or
Fn + F8 (- ).

Adjust the Contrast of the
display by using Fn + F5 (¯ )
or
Fn + F6 (- ).

Computer screen is in direct

Tilt display or move computer.

light.

Screen is blank. Screen save was initiated by

Power Management due to

Press any key or touch the
Touch Pad.

lack of user activity.

Display has overheated. If computer is in direct sunlight,

move it and allow it to cool off.

Display is blank and the Suspend
icon is flashing.

Internal display is blank and the
screen on an external monitor

System is in Suspend mode. Press any key or touch the

Touch Pad.

Display function was switched
to the external monitor.

Use Fn + F2 to switch between
LCD or CRT.

displays information.

Problem Probable Cause Solution(s)

Internal display flashes or has garbled
characters when computer is
connected to external monitor.

Using 1024 × 768 or
higher resolution on
external monitor and

Restart the computer.

have toggled back to
internal display, which
supports up to
800 × 600.

The light tubes on the edge of the display panel
do not light up at all and Power-On Self-Test
(POST) completes when the unit is powered
up.**

Improper backlight or display
cable connections

Defective inverter board. Replace the display assembly.

Replace the display assembly.

The light tubes on the edge of the display panel
do not light up at all and Power-On Self-Test
(POST) does not complete when the unit is
powered up.**

Backlight (brightness) cannot be adjusted with

Fn + F7 (¯ ) or
Fn + F8 (- ).***

Defective display cable. Replace the display assembly.
Defective display panel. Replace the display assembly.
Defective system board. Replace the system board.
Defective system board. Replace the system board.

Improper display cable
connections.

Defective inverter board. Replace the display assembly.
Defective display cable. Replace the display assembly.
Defective system board. Replace the system board.

1. Reseat the display cable to the
system board.

2. Replace the display assembly.

Contrast cannot be adjusted with
Fn + F5 (¯ ) or Fn + F6 (- ).

Improper display cable
connections.

Defective inverter board. Replace the display assembly.
Defective display cable. Replace the display assembly.
Defective system board. Replace the system board.

1. Reseat the display cable to the
system board.

2. Replace the display assembly.

This problem indicates that the backlight or its power circuitry has failed. Since you cannot
observe the POST result on the display panel when the backlight is not functioning, connect the
unit to an external monitor before powering the unit up. If an external monitor is not available,
verify that POST completes by opening and closing the display, listening for the single or double
beep, and watching for the LEDs turn on at the front of the computer.

Problem Probable Cause Solution(s)

This display panel has a continuous pattern
across it (e.g., a "jailbars" pattern), has a
single color on it, or has garbled graphics
across the entire panel. This failure is for
patterns across the entire panel (not just on
one section).

Improper display cable
connections

Defective display cable. Replace the display assembly.

Defective inverter board. Replace the display assembly.

Defective system board. Replace the system board.

Reseat the display cable to the following
until the problem is solved:

1. System board

2. Display assembly

Ghost bars extending from graphics on the
display.

A single line, small group of lines, or block
appears on the display panel. This failure
occurs in only a section of the display panel.

To perform a "self-test" on an external VGA color or monochrome monitor, complete the following steps: The

NOTE:

screen should be white. A narrow black border may also appear on the left and right sides of the display. Either of
these displays indicates that the monitor is working properly.

Common characteristic of STN
displays.

Defective display panel. Replace the display assembly.

1. Change the background colors.

2. Adjust the Contrast of the display by
using Fn + F5 (¯ ) or Fn + F6 (- ).

Solving Hard Drive Problems

Some common causes and solutions for hard drive problems are listed in the following table.

CAUTION: To prevent loss of information, always maintain an up-to-date backup of your hard drive at all

times, in case of errors or failures.

Solving Hard Drive Problems

Problem Probable Cause Solution(s)

Reading hard drive takes an unusually
long time after restarting the computer.

System entered Hibernation due to
low battery condition and is now
exiting from it.

Give the system time to restore the
previously saved data to its exact state
before Hibernation.

Hard drive error occurs. Hard drive has bad sectors or has

failed.

Hard drive does not work. Hard drive is not seated properly. Turn off and unplug the computer,

Run Computer Checkup.

remove the battery pack, and remove
and then reinstall the hard drive.

Solving Hardware Installation Problems

Some common causes and solutions for hardware installation problems are listed in the following
table.

Solving Hardware Installation Problems

Problem Probable Cause Solutions(s)

A new device is not recognized as
part of the computer system.

Cable(s) of new external
device are loose or
power cables are unplugged.

Ensure that all cables are
properly and securely
connected.

Power switch of new external

device is not turned on.

Turn off the computer, turn on
the external device, then turn
on the computer to integrate
the device with the computer
system.

Device is not seated properly. Turn off the computer and

reinsert the device.

Solving Keyboard/Numeric Keypad Problems

Some common causes and solutions for keyboard/numeric keypad problems are listed in the
following table.

Solving Keyboard/Numeric Keypad Problems

Problem Probable Cause Solution(s)

Embedded numeric keypad on
computer keyboard is disabled.

Num Lock function is not
enabled.

Press the Shift+NumLk keys
to enable the Num Lock
function and embedded
numeric keypad. The Num
Lock icon on the status panel
turns on.

Embedded numeric keypad is
disabled and Num Lock function is
on.

External numeric keypad is
connected to the computer.

Disconnect the external
numeric keypad from the
computer.

Solving Memory Problems

Some common causes and solutions for memory problems are listed in the following table.

Solving Memory Problems

Problem Probable Cause Solution(s)

Memory count during Power-On Self­Test (POST) is incorrect.

Optional memory expansion
card is installed incorrectly,
is incompatible with

Ensure that the optional
memory expansion card is
installed correctly.

the computer, or is defective.

"Out of Memory" message is
displayed on the screen or
insufficient memory error occurs

System ran out of
memory for the application.

Check the application
documentation for memory
requirements.

during operation.

Install additional memory.

Solving Minor Problems (continued)

Too many TSR (terminate­and stay-resident)
applications are running.

Remove from memory any
TSR applications that you do
not need.

Maintenance & Service Guide

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

| Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Solving PC Card Problems

Some common causes and solutions for PC Card problems are listed in the following table.

Solving PC Card Problems

Problem Probable Cause Solution(s)

When turned on, the computer
does not beep when a PC Card
is inserted.

Card is not inserted properly.

PC Card beeps are disabled.

Ensure the card is inserted
in the correct orientation.

Double-click the PC Card
icon in the Control Panel,
click the Global Settings
tab, the enable PC Card
sound effects.

Speaker is turned off or
volume is turned down.

Press volume buttons to
turn the speaker on, then
increase the volume.

PC Card drivers are not
installed.

Double click the Add New
Hardware icon in the

PC Card modem, fax, or
network card does not work.

Card or card driver is not
supported.

Card is not fully inserted into
the slot or is not inserted
properly.

Telephone cord is not

Control Panel for installation
instructions.

If PC Card or drivers are not
compatible with Windows,
install drivers and use the
PC Card in MS-DOS mode.

Contact your Compaq
authorized service provider
for a list of PC Cards tested
successfully in Compaq PC
Card platforms.

Ensure the card is inserted
in the correct orientation.

Check and secure telephone

PC Card modem or fax card
does not work.

Modem network PC Card
does not work.

plugged in all the way.
Necessary drivers are not

connection.
Install drivers.

installed (turned on).
You are trying to access the

card using the wrong COM

See
COM port.

Specifications to verify

port.
The card conflicts with a

serial device.

See

Specifications to verify

address.

The card is not supported. Use supported cards only.

Network driver is not installed or is

Install driver.

not set up properly.
Telephone cord is not properly

connected.

Verify telephone
connection.

Memory or storage card
does not work.

SRAM and flash memory cards
require the memory card driver to be
loaded (turned on).

Flash memory cards require the
Microsoft FlashFile System to
be loaded.

Hard drives on flash mass storage
cards require the PC Card ATA driver
to be loaded.

You are trying to access the hard
drive card using the wrong drive
letter.

Install driver.

Double-click My
Computer to verify
the drive letter
assigned to the card.

The card is not
supported.

Solving Power Problems

Also see "Solving Battery and Battery Gauge Problems" in this section.

Solving Power Problems

Contact your
Compaq authorized
service provider for a
list of PC Cards
tested successfully in
Compaq PC Card
platforms.

Problem Probable Cause Solution(s)

Computer won't turn on and
battery pack is not inserted.

Computer is not connected to
a power source.

Power cords to the external
power source are unplugged.

Insert battery or connect
an external power source.

Ensure that power cords
connecting the computer
and the external power
source are plugged in
properly.

Power adapter is defective. Replace AC Adapter and

restart.

Computer turned off while it was
left unattended and the power icon
is off.

System board is defective. Replace the system board.
System initiated Hibernation

due to a critical low-battery
condition.

Replace the battery pack
with a fully charged
battery pack or connect
the computer to an
external power source.
Then turn on the
computer.

System initiated Hibernation

Turn on the computer.

after a preset timeout.

Solving Printer Problems

If you experience problems printing, run a printer self-test. Refer to the documentation provided with your printer for
instructions. If the self-test fails, it is a printer-specific problem. Also refer to the printing section of your application
documentation.

Solving Printer Problems

Problem Probable Cause Solution(s)
Printer will not turn on. The signal cable may not be

connected properly, or the
printer is unplugged.

Ensure that the signal
cable is properly
connected and that the
power cord is connected to
the electrical outlet.

Printer will not print. Printer is not turned on or is

off line.
The device drivers for your

application are not installed.

Turn the printer on and set
it to on line.

Refer to the printer
documentation to install
the correct printer driver.

Printer that is set up for a
network is not connected to

Connect the printer to the
network.

the network.

Printer cable is too long,
unshielded, or defective.

Paper tray is empty. Fill the paper tray with

Printer prints garbled information. Correct printer drivers

are not installed.

Cable is not
connected properly.

Replace the cable.

paper and set the printer
to online.

Refer to the printer
documentation to install
the correct printer driver.

Ensure that the printer
signal cable is properly
connected to the
computer.

Cable is defective. Replace the printer cable

and retest.

Solving Touch Pad/Pointing Device Problems

Some common causes and solutions for Touch Pad/pointing device problems are listed in the
following table.

Solving Touch Pad/Pointing Device Problems

Problem Cause Solution(s)
Touch Pad or mouse does not work. Incorrect or no device driver

Install the device driver

is installed.

The device driver is not
installed in Windows.

External mouse does not work. Mouse is not securely

connected or is connected to
an incorrect external
connector.

Touch Pad or mouse does not work

Mouse is not enabled. Enter MOUSE at the
even though the device is enabled
in Windows.

and add to the
AUTOEXEC.BAT file or
CONFIG.SYS file.

Install the Touch
Pad/mouse driver in
Windows.

Ensure that the mouse is
securely connected to the
appropriate external
connector.

system prompt to activate
the mouse device driver.

Add a line in the
AUTOEXEC.BAT file to

Cursor skips or moves abnormally
when using the Touch Pad.

automatically activate the
mouse device driver each
time computer is turned
on or restarted.

Cable not properly seated in

Reseat cable.

Touch Pad board.

Defective Touch Pad board. Replace Touch Pad board.

Defective system board. Replace system board.

Device driver is not correctly

installed in Windows.

The Touch Pad needs to be

cleaned.

Install the appropriate
device driver in Windows.

Clean the Touch Pad with
a cloth dampened with
alcohol or an ammonia­based glass cleaner. Wipe
up liquid with a dry cloth.

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Battery Pack Operating Time

This appendix covers the following information concerning battery pack operating time:

● Increase battery pack operating time

● Conditioning a battery pack

● Disposal of a used battery pack

Increasing Battery Pack Operating Time

Battery pack operating time differs depending on several variables. To avoid unnecessary
replacement, consider the following variables when determining how long a charged battery pack
should last:

● Power management settings

● Hardware configuration

● Software applications

● Installed options

● Display brightness

● Hard drive usage

● Changes in operating temperature

● Type and number of installed PC Cards

NOTE:

the battery pack very rapidly.

Battery pack operating time can be increased by as much as 50 percent by controlling the energy
required by the computer and the energy stored in the battery pack.

Minimizing the Energy Required

To minimize the energy required by the computer, follow these steps:

● Set the power conservation levels in the Power Management utility to Maximum.

● Customize the timeout value to work more efficiently with the applications. The

amount of battery life depends on the values selected.

The power consumption requirements for PC Cards vary widely. Some cards drain

Maximizing the Energy Stored

To maximize the energy stored in the battery pack, follow these guidelines:

● Condition the battery pack at least every 30 days to improve overall battery

performance.

● Keep a battery pack in the computer when using it with AC power to supply the

battery pack with a constant trickle charge.

● Store the battery pack in a cool, dry place when not in use.

Conditioning a Battery Pack

CAUTION: To avoid a loss of data, ensure that all data is saved before discharging a
battery pack.

To condition a battery pack, complete the following steps:

1. Plug in the AC adapter and allow the battery to charge until the LED light on the
display stops blinking. Your battery gauge may read 100 percent for a period of time
before LED light on the display stops blinking. Do not unplug the AC adapter until the
arrow disappears.

2. Unplug the AC adapter and allow the battery to drain until the computer reaches
hibernation and turns itself off. Do not plug in the AC adapter during this process
or you will need to restart with Step No. 1. You may use the computer while the
battery is draining.

3. Your battery is re- conditioned.

4. Plug in the AC adapter and begin using the computer.

The table below shows the approximate battery pack charge times.

Approximate Battery Charge Time

Computer On Line Off Line

NiMH Battery Pack 4.0 hours premature termination 2:00 hrs

Li ion Battery Pack 4.5 hours premature termination 2:50 hrs

Disposal of a Used Battery Pack

In the interest of safeguarding our environment. Compaq Computer Corporation recommends that
nickel metal hydride (NiMH) and lithium ion (Li ion) battery packs be recycled. Battery packs
should be handled in accordance with country, state, province, or local regulations.

CAUTION: Never attempt to open or service a battery pack. Opening a battery pack
not only damages the pack and makes it unusable, but also expose potentially harmful
battery components.

Top of Page

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Index

Connector Pin Assignments

This appendix provides connector pin assignment tables for Compaq Presario
1200 Series Portable Computers. For more information on connectors, refer to
the section on Rear Connectors.

NOTE: The signals in all tables of this appendix are considered active high
unless otherwise indicated by an asterisk (*).

Parallel Connector

Pin Signal Pin Signal

1 Strobe* 10 Acknowledge*
2 Data Bit 0 11 Busy
3 Data Bit 1 12 Paper Out
4 Data Bit 2 13 Select
5 Data Bit 3 14 Auto Linefeed*
6 Data Bit 4 15 Error*
7 Data Bit 5 16 Initialize Printer*
8 Data Bit 6 17 Select In*
9 Data Bit 7 18-25 Signal Ground
* = Active low

Serial Connector

Connector Pin Signal

1

2

3

4

5

6

7

Carrier Detect

Receive Data

Transmit Data

Data Terminal Ready

Signal Ground

Data Set Ready

Ready to Send

8

9

Keyboard/Mouse

Connector Pin Signal

1

2

3

4

5

Clear to Send

Ring Indicator

Data 1

Data 2

Ground

+5 V

Clock 1

6

External VGA Monitor

Connector Pin Signal

1

2

3

4

5

Clock 2

Red Analog

Green Analog

Blue Analog

Not connected

Ground

6

7

8

9

10

11

12

13

Ground Analog

Ground Analog

Ground Analog

Not connected

Ground

Monitor Detect

DDC2B Data

Horizontal Sync

14

15

Universal Serial Bus

Connector Pin Signal

1

2

3

4

Vertical Sync

DDC2B Clock

+5V
Data ­Data +
Ground

Modem

Connector Pin Signal

1

2

3

4

5

6

Unused

Unused

Tip

Ring

Unused

Unused

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit

This section provides an breakdown and identifies the spare
parts ordering number associated with each item(s) for the
Compaq Presario 1200 Series Portable Computers.

Index

Cables
Miscellaneous

Hardware and
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Presario 1200 Series

US 330956-001

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

System Unit

System Unit

Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit

Keyboard

Index

Cables
Miscellaneous

Hardware and
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Presario 1200 Series

Modem, K-56.0 Kbps Data/Fax w/o SRAM 138659-001

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Boards

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Cable Kit

Index

Cables
Miscellaneous

Hardware and
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Presario 1200 Series

Models: 1234, 1235, 1236, 1237, 1238, 1240, 1242, 1250, and 1252

Before You Begin Specifications Parts Catalog

Removal Sequence Troubleshooting Battery Operations

Product Description Pin Assignments

Display
Assembly

System Unit
Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Cable Kit

Index

Cables
Miscellaneous

Hardware and
Plastics Kit

Miscellaneous
Parts

Documentation
and Software