HP Compaq Presario 1246, Compaq Presario 1277, Compaq Presario 1278 Service Guide

Maintenance & Service Guide

Presario Series

Models: 1246, 1277, 1278, and 1279

Home Page | Notice | Preface | Product Description | Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

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. The Notice contains the copyright and trademark information. The

Preface shows symbol conventions,

Technician 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 the

To report a technical problem, contact your Regional Support Center or IM Help Center.

Editor.

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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.

1999

Compaq Computer Corporation.

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

Microsoft, MS-DOS, and Windows are registered trademarks of Microsoft Corporation. Windows 98 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 Series Portable Computer

First Edition (

Compaq Computer Corporation

October 1999)

Maintenance & Service Guide

WARNING.GIF

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations |

Preface

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

Compaq Computer Corporation reserves the right to make changes to the Compaq Presario 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:

NOTE:

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

Text set off in this manner presents clarifying information or specific instructions.

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, you should provide the computer serial number 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 Series Portable Computer documentation set

● Introducing Windows 98 Guide

● Service Training Guides

● Compaq Service Advisories and Bulletins

● Compaq QuickFind

● Compaq Service Quick Reference Guide

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of Unit

Rear Connectors

Power Management for Windows 98

The Compaq Presario Series Portable Computer is

a continuation of the new generation of multimedia portable computers with an innovative and integrated design, outstanding audio and video, advanced core features, and attractive styling. This fullfunction, AMDK6II-based portable computer allows full desktop functionality.

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Models and Features

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of Unit

Rear Connectors

Compaq Presario Series Portable Computer Models

Display Processor Hard Drive CD Drive Modem

System Memory

Battery

Display Processor

Model 1246 Model 1247

12.1" HPA 12.1" HPA AMD-K6II MMX 400-Mhz AMD-K6II MMX 400-Mhz

4.3-GB 4.3-GB 24x CD-ROM 24x CD-ROM

56.0 Kbps PCI data/fax 56.0 Kbps PCI data/fax

32-MB 32-MB 3800 MAH NiMH 3800 MAH NiMH

Model 1277 Model 1278

13.0" HPA 12.1" HPA AMD-K6II MMX 433-Mhz

Power Management for Windows 98

Hard Drive CD Drive

Modem System

Memory Battery

Display Processor

AMD-K6II MMX 400-Mhz (or) AMD-K6II MMX 433-Mhz

4.8-GB 4.8-GB

24x CD-ROM 24x CD-ROM

56.0 Kbps PCI data/fax 56.0 Kbps PCI data/fax

64-MB 64-MB

3200 MAH sLION 3200 MAH sLION

Model 1279

12.1" HPA

AMD-K6II MMX 433Mhz

Hard Drive CD Drive

Modem System

Memory Battery

4.8-GB

24x CD-ROM

56.0 Kbps PCI data/fax

64-MB

3200 MAH sLION

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Controls and Lights

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of Unit

Rear Connectors

Power Management for Windows 98

1. Display

2. Power (On/Off) Button

3. Keyboard

4. Touch Pad

5. Touch Pad Button (Left)

6. Headphone Jack

7. Microphone Jack

8. Touch Pad Button (Right)

9. Integrated Speakers and Ports

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Front Bezel Lights

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of

1. Power Light

2. Battery Charge Light

3. Power Cord Light

4. Num Lock Light

5. Cap Lock Light

6. Scroll Lock Light

Unit Rear

Connectors Power

Management for Windows 98

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Front Bezel Buttons

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of Unit

Rear

1. Instant Internet Access Button

2. Instant Search Button

3. Volume Down Button

4. Scroll Up/Down Button

5. Volume Up Button

6. Secure ECommerce Button (or favorite Web site)

Connectors Power

Management for Windows 98

7. Instant E-Mail Button

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Left Side Components

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of

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

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Right Side Components

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of

1. Battery Compartment

2. CD Drive Eject Button

3. CD Drive Manual Eject Hole

Unit Rear

Connectors Power

Management for Windows 98

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of Unit

1. Memory Compartment Door

2. Stand Feet

Rear Connectors Power

Management for Windows 98

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Product Description

Rear Connectors

Presario Series

Models and Features

Controls and Lights

Front Bezel Lights

Front Bezel Buttons

Left Side Components

Right Side Components

Bottom of Unit

Rear Connectors

1. AC Adapter

2. Universal Serial Bus

3. Security Slot

4. Serial Port

5. External Monitor Port

6. Parallel Printer Port

7. Keyboard/Mouse Port

8. Modem Jack

Power Management for Windows 98

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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

Pow

er 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 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 goes 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.)

IMPORTANT:

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

Tab: Power Schemes: Plugged in Running on Batteries Always on System Standby: Never 15 minutes Turn OFF Monitor Always on System Standby: After 15 minutes After 10 minutes

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

Never.

Power Management Properties

After 3 hours Never

Power Management Properties

Tab: Alarms:

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

Tab: Power Meter: Tab: Advanced:

Text Action No Action

Power Management Properties

Default 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 Series Notebook computers have two levels of sleep-- Hibernation and Sleep.

Hibernation - by pushing the power button once, your computer performs 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 maintains system information and open files. Unsaved information is 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 maintains system information and open

files. Unsaved information is lost if you turn off your system prior to system wake-up, 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 displays a progress screen, as it automatically saves the machine state before it shuts down and turns itself off. Your computer automatically goes 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 displays 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

Hibernate

Manual keys combinationFn+F4

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

Manual - Press Power button once

Time Out Default If low battery or after 1 hour of sleep (system will not Hibernate if on AC power)

Press any key

Press Power button once

Flashing green Power LED

No Power LED, blank screen

Off

Perform normal Windows shutdown via the start button, or

Press Power button once

No Power LED, blank

screen press and hold down the power button for 4 seconds

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 placing the computer into Off mode. Then, unplug the computer from the AC outlet and remove the battery (see battery section for instruction for removing the battery pack).

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, do the following:

1. Press the Power Button and hold it for four seconds to shut it down.

2. Remove the battery or unplug the AC power for at least 30 seconds.

3. Reinsert the battery or reconnect AC power.

4. 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

Top of Page

Battery Pack Operations.

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Presario Series

Preliminary Steps

Clearing the Power-On Password

Power-On Self Test (POST)

Compaq Diagnostics

Diagnostic Error Codes

Troubleshooting Without Diagnostics

Solving Minor Problems

Contacting Compaq Support

This section covers troubleshooting information for the Compaq Presario Series Portable Computers. The basic steps in troubleshooting include:

1. Follow the

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

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

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.

NOTE:

If the problem is intermittent, check the computer several times to verify that the problem is solved.

Preliminary Steps.

Diagnostic Error Codes perform them in the order

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Preliminary Steps

Presario Series

Preliminary Steps

Clearing the Power-On Password

Power-On Self Test (POST)

Compaq Diagnostics

Diagnostic Error Codes

Troubleshooting Without Diagnostics

Solving Minor Problems

Before running

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

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.

IMPORTANT:

IMPORTANT: If the problem only occurs when an external device is

connected to the computer, the problem may be related to the external device or its cable. Verify this by running POST with and without the external device connected.

Computer Checkup.

POST, complete the following preliminary steps:

clear the password .

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.

Contacting Compaq Support

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.

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Clearing the Power-on Password

Clearing the power-on password requires removing all Setup attributes that are programmed in the CMOS.

The RTC battery is located on the system board.

If the password is not known, clear it by performing the following steps:

1. Turn off the computer.

2. Disconnect the power cord.

3. Remove the

4. Remove the Palmrest

Cover with Touch Pad.

5. Remove the heatspreader.

battery pack.

6. Remove the keyboard.

7. Remove RTC battery for 30 seconds and replace it.

8. Reassemble the computer.

9. Turn on the computer to verify that the power-on password has been cleared. If it has not been cleared, repeat Steps 1 through 9.

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Power-On Self Test (POST)

Presario Series

Running POST

To run POST, 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

NOTE:

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

NOTE:

The following routines are sorted by their test point numbers assigned in the BIOS code. Their actual orders, as executed during POST, can be quite different.

Code Beeps POST Routine Description

02h Verify Real Mode 03h Disable Non-Maskable Interrupt (NM) 04h Get CPU type 06h Initialize system hardware 08h Initialize chipset with Initial POST values 09h Set IN POST flag 0Ah Initialize CPU registers 0Bh Enable CPU cache 0Ch Initialize caches to initial POST values 0Eh Initialize I/O component 0Fh Initialize the local bus IDE 10h Initialize Power Management 11h Load alternate registers with initial POST values 12h Restore CPU control word during warm boost 13h Initialize PCI Bus Mastering devices 14h Initialize keyboard controller 16h

1-2-2-3

BIOS ROM Checksum 17h Initialize cache before memory autosize 18h 8254 timer initialization 1Ah 8237 DMA controller initialization 1Ch Reset Programmable Interrupt Controller 20h 22h

1-3-1-1 1-3-1-3

Test DRAM refresh

Test 8742 Keyboard Controller 24h Set ES segment register to 4 GB 26h Enable A20 line 28h Autosize DRAM 29h Initialize POST Memory Manager 2Ah Clear 512 KB base RAM

2Ch

1-3-4-2

RAM failure on address line xxxx*

RAM failure on data bits xxxx* of low byte of memory

2Eh

1-3-4-3

bus

2Fh

Enable cache before system BIOS shadow

RAM failure on data bits xxxx*of high byte memory

30th

1-4-1-1

bus

32h 33h 36h 38h 3Ah 3Ch 3Dh 42h 45h 46h 48h 49h 4Ah

2-1-2-3

Test CPU bus-clock frequency

Initialize Phoenix Dispatch Manager

Warm start shut down

Shadow system BIOS ROM

Autosize cache

Advanced configuration of chipset registers

Load alternate registers with CMOS values

Initialize interrupt vectors

POST device initialization

Check ROM copyright notice

Check Video configuration against CMOS

Initialize PCI bus and devices

Initialize all video adapters in system

4Bh 4Ch 4Eh 50Eh 51h 52h 54h 58h 59h 5Ah 5Bh 5Ch 60h

2-2-3-1

QuietBoot start (optional)

Shadow video BIOS ROM

Display BIOS copyright notice

Display CPU type and speed

Initialize EISA board

Test keyboard

Set key click if enabled

Test for unexpected interrupts

Initialize POST display service

Display prompt "Press F2 to enter SetUP"

Disable CPU cache

Test RAM between 512 and 640 KB

Test extended memory

62h 64h 66h 67h 68h 69h 6Ah 6Bh 6Ch 6Eh 70h 72h 76h

Test extended memory address lines

Jump to UserPatchI

Configure advanced cache registers

Initialize Multi Processor APIC

Enable external and CPU cache

Setup System Management Mode (SMM) area

Display external L2 cache size

Load custom defaults (optional)

Display shadow-area message

Display possible high address for UMB recovery

Display error messages

Check for configuration errors

Check for keyboard errors

7Ch 7Eh 80h 81h 82h 83h 84h 85h 86h 87h 88h 89h 8Ah

Set up hardware interrupt vectors

Initialize coprocessor if present

Disable onboard Super I/O ports and IRQs

Late POST device initialization

Detect and install external RS232 ports

Configure non-MCD IDE controllers

Detect and install external parallel ports

Initialize PC-compatible PnP ISA devices

Reinitialize onboard I/O ports

Configure Motherboard Configurable Devices (optional)

Initialize BIOS Data Area

Enable Non-Maskable Interrupts (NMIs)

Initialize Extended BIOS Data Area

8Bh 8Ch 81h 90h 91h 92h 93h 95h 96h 97h

98h 99h

Test and initialize PS/2 mouse

Initialize floppy controller

Determine number of ATA drives (optional)

Initialize hard disk controllers

Initialize local-bus hard disk controllers

Jump to UserPatch2

Build MPTABLE for multi-processor boards

Install CD ROM for boot

Clear huge ES segment register

Fixup Multi Processor table

Search for option ROMs. One long, two short beeps on

1-2

checksum failure

Check for SMART drive (optional)

9Ah 9Ch 9Dh 9Eh 9Fh A0h A2h A4h A8h AAh ACh AEh B0h

Shadow option ROMs

Set up Power Management

Initialize security engine (optional)

Enable hardware interrupts

Determine number of ATA and SCSI drives

Set time of day

Check key lock

Initialize Typematic rate

Erase F2 prompt

Scan for F2 key stroke

Enter Setup

Clear Boot flag

Check for errors

B2h B4h B5h B6h B9h BAh BBh BCh BDh BEh BFh C0h C1h

POST done - prepare to boot operating system

One shot beep before boot

Terminate QuietBoot (optional)

Check password (optional)

Prepare Boot

Initialize DMI Parameters

Initialize PnP Option ROMs

Clear parity checkers

Display MultiBoot menu

Clear screen (optional)

check virus and back up reminders

Try to boot with INT 19

Initialize POST Error Manager (PEM)

C2h C3h C4h C5h C6h C7h C8h C9h D2h

Initialize error logging

Initialize error display function

Initialize system error handler

PnPnd dual CMOS (optional)

Initialize notebook docking (optional)

Initialize notebook docking late

Force check (optional)

Extended checksum (optional)

Unknown interrupts

Code Beeps For Boost Block in Flash ROM

E0h E1h E2h E3h E4h E5h E6h E7h E8h E9h EAh EBh ECh

Initialize the chipset

Intitialize the bridge

Initialize the CPU

Initialize system timer

Initializesystem I/O

Check force recovery boot

Checksum BIOS ROM

Go to BIOS

Set Huge Segment

Initialize Multi Processor

Initialize OEM Special code

Initialize PIC and DMA

Initialize Memory type EDh EEh EFh F0h F1h F2h F3h F4h F5h F6h F7h

Initialize Memory size

Shadow Boot Block

System memory test

Initialize interrupts vectors

Initialize Run Time Clock

Initialize Video

Initialize beeper

Initialize boot

Clear Huge segment

Boot to Mini DOS

Boot to Full DOS

Maintenance & Service Guide

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Compaq Diagnostics

Presario Series

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 error log. 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.

NOTE:

If the list is incorrect, ensure that any new devices are installed 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 to run the tests for a specified number of times, to stop on errors, or to print or save an error log.

■ 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 an error log.

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 the steps listed below 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.

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

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.

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

IMPORTANT:

Cards in the PC slots.

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

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

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

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

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 501 through 516 Video Test 600 through 699 Diskette Drive Test

Retest the system after completing each step. When a step resolves the problem, do not

proceed with the remaining steps.

Removal and Replacement Procedures.

1101 Serial Test 1701 through 1736 Hard Drive Test 2402 through 2480 Video Test 3206 Audio Test 8601 through 8602 TouchPad/Pointing Device interface Test 3301 through 6623 CD Drive Test

Processor Test Error Codes

Error Code

101-xx 102-xx Coprocessor or Weitek Error 1. Run the Configuration and Diagnostics

CPU test failed Replace the processor and retest.

Description Recommended Action

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. 301-xx Failed Selftest/Interface Test 302-xx Failed Individual Key Test

2. Replace the system board and retest.

2. Install a new memory module and retest.

If disconnected, turn off the computer and connect the keyboard.

2. Replace the keyboard and retest. 304-xx Failed Keyboard Repeat Test

3. Replace the system board and retest.

Parallel Printer Test Error Codes

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

2. Check power to the printer. 402-xx Failed Port Test

3. Install the loop-back connector and retest.

403-xx Failed Printer Pattern Test

Video Test Error Codes (501-xx through 516-xx)

501-xx Failed Video Controller Test 502-xx Failed Video Memory Test 503-xx Failed Video Attribute Test 504-xx Failed Video Character Set Test

4. Check port and IRQ configuration.

5. Replace the system board and retest.

1. Disconnect external monitor and test with

internal LCD display.

2. Replace the display assembly and retest.

505-xx

506-xx 507-xx Failed Video 40 x 25 Mode Test

508-xx Failed Video 320 x 200 Mode Color Set 0 Test 509-xx Failed Video 320 x 200 Mode Color Set 1 Test 510-xx Failed Video 640 x 200 Mode Test 511-xx Failed Video Screen Memory Page Test 512-xx Failed Video Gray Scale Test 514-xx Failed Video White Screen Test 516-xx Failed Video Noise Pattern Test

600-xx

Failed Video 80 x 25 mode 9 x 14 Character Cell Test

Failed Video 80 x 25 mode 8 x 8 Character Cell Test

Diskette Drive Test

Failed Diskette ID Drive Types Test 1. Replace the diskette media and retest.

3. Replace the system board and retest.

601-xx 602-xx

603-xx 604-xx

605-xx 606-xx 609-xx 610-xx 697-xx

698-xx 699-xx Diskette drive/media ID error 1. Replace media.

Failed Diskette Format Failed Diskette Read Test Failed Diskette Write/Read/Compare Test

Failed Diskette Random Read Test Failed Diskette ID Media Failed Diskette Speed Test Failed Diskette Reset Controller Test Failed Diskette Change Line Test Diskette type error Diskette drive speed not within limits

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.

2. Run the Configuration and Diagnostics

Utilities.

Serial Test Error Codes

1101-xx Failed Serial Port Test 1. Check port configuration.

2. Replace the system board and retest.

Hard Drive Test Error Codes

1701-xx 1702-xx

1703-xx 1704-xx

1705-xx 1706-xx 1707-xx

1708-xx

Failed Hard Drive Format Test 1. Run the Configuration and Diagnostics Failed Hard Drive Read Test Failed Hard Drive Write/Read/Compare Test

Failed Hard Drive Random Seek Test Failed Hard Drive Controller Test Failed Hard Drive Ready Test Failed Hard Drive Recalibration Test Failed Hard Drive Format Bad Track Test

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.

1709-xx 1710-xx

1715-xx 1716-xx 1717-xx

1719-xx 1724-xx

1736-xx *ECC = Error Correction Code

2402-xx 2403-xx

Failed Hard Drive Reset Controller Test

Failed Hard Drive Park Head Test Failed Hard Drive Head Select Test Failed Hard Drive Conditional Format Test

Failed Hard Drive ECC* Test Failed Hard Drive Power Mode Test Failed Network Preparation Test Failed Drive Monitoring Test

Video Test Error Codes (2402-xx through 2480-xx)

Failed Video Memory Test 1. Run the Configuration and Diagnostics Failed Video Attribute Test

Utilities

2404-xx

2405-xx

2406-xx

2408-xx

2409-xx

2410-xx

2411-xx

2412-xx

2414-xx

Failed Video Character Set Test Failed Video 80 x 25 mode 9 x 14 Character Cell

Test Failed Video 80 x 25 mode 8 x 8 Character Cell

Test Failed Video 320 x 200 Mode Color Set 0 Test

Failed Video 320 x 200 Mode Color Set 1 Test Failed Video 640 x 200 Mode Test

Failed Video Screen Memory Page Test

Failed Video Gray Scale Test Failed Video White Screen Test

2. Replace the display assembly and retest.

3. Replace the system board and retest.

2416-xx 2418-xx

2419-xx 2421-xx 2422-xx

2423-xx

2424-xx

2425-xx

2431-xx

Failed Video Noise Pattern Screen Failed ECG/VGC Memory Test

Failed ECG/VGC ROM Checksum Test 1. Run the Configuration and Diagnostics

Utilities.

Failed ECG/VGC 640 x 200 Graphics Mode Test Failed ECG/VGC 640 x 350 16 Color Set Test Failed ECG/VGC 640 x 350 64 Color Set Test

Failed ECG/VGC Monochrome Text Mode Test

Failed ECG/VGC Monochrome Graphics Mode Test

Failed 640 x 480 Graphics Test

2. Disconnect external monitor and test with

internal LCD display.

3. Replace the display assembly and retest.

4. Replace the system board and retest.

2432-xx

2448-xx

2451-xx 2456-xx Failed Advanced VGA 256 Color Test

2458-xx Advanced VGA BitBLT Test Replace the system board and retest. 2468-xx Advanced VGA DAC Test

2477-xx Advanced VGA Data Path Test

2478-xx Advanced VGA BitBLT Test

2480-xx Advanced VGA LineDraw Test

Failed 320 x 200 Graphics (256 Color Mode) Test Failed Advanced VGA Controller Test

Failed 132-Column Advanced VGA Test

Audio Test Error Codes

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

TouchPad/Pointing Device Interface Test Error Codes

8601-xx Failed Mouse Test 1. Replace the TouchPad and retest.

8602-xx Failed Interface Test

CD Drive Test Error Codes

3301-xx Failed CD Drive Read Test 1. Replace the CD and retest.

3305-xx Failed CD Drive Seek Test

6600-xx Failed ID Test

2. Replace the system board and retest.

2. Verify that the speakers are connected.

3. Verify that drivers are loaded and properly

installed.

6605-xx Failed Read Test

6608-xx Failed Controller Test

6623-xx Failed Random Read Test

4. Replace the CD drive and retest.

5. Replace the system board and retest.

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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

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.

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting Without Diagnostics

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).

Solving Battery Pack and Battery Gauge Problems

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

No action is required.

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.

Computer is beeping and battery LED icon is blinking.

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.

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

do any one of the following:

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.

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

● 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. RTC battery is dead. Replace the RTC battery.

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

Problem Probable Cause Solution(s)

Battery charge does not last as long as expected.

Battery pack is warm to the touch after charging.

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.

Normal warming has occurred due to charging.

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. No action is required.

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

Power management is turned off or disabled.

An external device or PC Card is draining the battery.

Battery pack has partially selfdischarged.

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

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.

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 write-protected.

Computer is writing to the wrong drive.

Not enough space is left on the diskette.

Drive error has occurred. Run Computer Checkup from the

Diskette is not formatted. Format the diskette. At the system

Check the drive letter in the path statement.

Use another diskette.

Compaq Diagnostics diskette.

prompt, enter FORMAT A:

Diskette drive cannot read a diskette. The wrong type of diskette is being

used.

Cannot boot from diskette. Bootable diskette is not in drive A. Put the bootable diskette in drive A.

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

Drive error has occurred. Run Computer Checkup from the

Diskette is not formatted.

Diskette Boot has incorrect setting in Computer Setup.

Use the type of diskette required by the drive.

diskette. Reformat bad floppy.

Compaq Diagnostics diskette. Format the diskette. At the system

prompt, enter FORMAT A:

Run Computer Setup and set 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 (- ).

Computer screen is in direct light. Tilt display or move computer.

Screen is blank. Screen save was initiated by Power

Management due to lack of user activity.

Display has overheated. If computer is in direct sunlight, move it

Display is blank and the Suspend icon is flashing.

Internal display is blank and the screen on an external monitor displays information.

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

Display function was switched to the external monitor.

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

Press any key or touch the Touch Pad.

and allow it to cool off.

Use Fn + F2 to switch between LCD or

CRT.

Problem Probable Cause Solution(s)

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

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.**

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.**

Using 1024 × 768 or higher resolution on external monitor and have toggled back to internal display, which supports up to 800 × 600.

Improper backlight or display cable connections

Defective inverter board. Replace the display assembly. 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.

Restart the computer.

Replace the display assembly.

Backlight (brightness) cannot be adjusted with

Fn + F7 (¯ ) or Fn + F8 (- ).***

Contrast cannot be adjusted with

Fn + F5 (¯ ) or Fn + F6 (- ).

** 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.

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. 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.

1. Reseat the display cable to the system board.

2. Replace the display assembly.

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.

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.

Defective system board. Replace the system board.

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 .

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.

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.

Power switch of new external

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

Ensure that all cables are properly and securely connected.

Turn off the computer, turn on the

device is not turned on.

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 Self-Test (POST) is incorrect.

Optional memory expansion card is installed incorrectly, is incompatible with the computer, or is defective.

Ensure that the optional memory expansion card is installed correctly.

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

System ran out of memory for the application.

Too many TSR (terminate-and stayresident) applications are running.

Check the application documentation for memory requirements.

Install additional memory.

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

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Troubleshooting

Solving PC Card Problems

Maintenance & Service Guide

Presario Series

Pin Assignments | Battery Pack Operations

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, and click the Global Settings tab; the

enable PC Card sound effects.

Speaker is turned off or volume is turned down.

PC Card drivers are not

Press volume buttons to turn the speaker on

volume.

Double click the Add New

; then, increase the

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

installed.

Card or card driver is not supported.

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

Telephone cord is not

Hardware icon in the 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

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

Ensure

the correct orientation.

that the card is inserted in

-authorized

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

Specifications to verify

COM port.

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

Install driver. installed or is not set up properly.

Telephone cord is not

Verify telephone connection.

Memory or storage card does not work.

properly connected. 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

Install driver.

Double-click My Computer

Solving Power Problems

Problem

Computer won't turn on and

hard drive card using the wrong drive letter.

to verify the drive letter

assigned to the card. The card is not supported. Contact your Compaq

authorized service provider

for a list of PC Cards tested

successfully in Compaq PC

Card platforms.

Solving Power Problems

Probable Cause

Computer is not connected to

Insert battery or connect

Solution(s)

battery pack is not inserted.

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

a power source.

Power cords to the external power source are unplugged.

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. 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.

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

Printer cable is too long, unshielded, or defective.

Paper tray is empty. Fill the paper tray with

Turn the printer on and set it to on line.

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

Connect the printer to the network.

Replace the cable.

paper and set the printer to online.

Printer prints garbled information.

Correct printer drivers are not installed.

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

Cable is not connected properly.

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.

External mouse does not work. Mouse is not securely connected or

Touch Pad or mouse does not work even though the device is enabled in Windows.

Incorrect device drive, or no device

driver is installed.

The device driver is not installed in Windows.

is connected to an incorrect external connector.

Mouse is not enabled. Enter MOUSE at the system

Install the device driver 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.

prompt to activate the mouse device driver.

Cursor skips or moves abnormally when using the Touch Pad.

Add a line in the AUTOEXEC.BAT file to automatically activate the mouse device driver each time computer is turned on or restarted.

Cable not properly seated in 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. Clean the Touch Pad with a cloth

Reseat cable.

Install the appropriate device driver in Windows.

dampened with alcohol or an ammonia-based glass cleaner. Wipe up liquid with a dry cloth.

Maintenance & Service Guide

Presario Series

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit Boards Display

Assembly Mass Storage

Devices Miscellaneous

Cable Kit Miscellaneous

Hardware Kit Miscellaneous

Plastics Kit Miscellaneous

Parts Documentation

and Software

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

Maintenance & Service Guide

United States 141706-001

LION Enhanced 388647-001

Models: 1246, 1247, 1277, 1278, and 1279

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit

Presario Series

System Unit Boards

Display Assembly

Mass Storage Devices

Miscellaneous Cable Kit

Miscellaneous Hardware Kit

Miscellaneous Plastics Kit

Miscellaneous Parts

Documentation

Description

1. Keyboard

Palmrest Cover w/TouchPad and Button Board (Models 1277 and 1278)

2. Palmrest Cover w/TouchPad and Button Board (Models: 1246, 1247,

1278)

Spare Part Number

142654001

142653-001

and Software

2. Palmrest Cover w/TouchPad (without Soft Paint) (Model TBD)

3. Upper CPU Cover w/Power Switch

4. Speaker Assembly w/Cables

5. Base

Enclosure

6. Battery Pack

161416-001

158799-001

148108-001

158798-001

+ 57 hidden pages