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

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Maintenance & Service Guide

Presario Series

Models: 1246, 1277, 1278, and 1279

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 Editor.

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

Maintenance & Service Guide

Presario Series

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

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.

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 (October 1999)

Compaq Computer Corporation

Maintenance & Service Guide

Presario Series

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

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.

	WA	WARNING: Text set off in this manner indicates that failure to follow directions in the
	WA	warning could result in bodily harm or loss of life.
		warning could result in bodily harm or loss of life.

CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of data.

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

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

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

WA 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

Presario Series

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

Product Description

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, AMD- K6II-based portable computer allows full desktop functionality.

Maintenance & Service Guide

Presario Series

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

Product Description

Models and Features

Models and
Models and	Compaq Presario Series Portable Computer Models
Features	Compaq Presario Series Portable Computer Models

		Model 1246	Model 1247

Controls and
Controls and	Display	12.1" HPA	12.1" HPA
Lights	Display	12.1" HPA	12.1" HPA
	Processor	AMD-K6II MMX 400-Mhz	AMD-K6II MMX 400-Mhz

Front Bezel
Lights	Hard Drive	4.3-GB	4.3-GB
	Hard Drive	4.3-GB	4.3-GB

Front Bezel	CD Drive	24x CD-ROM	24x CD-ROM
Buttons	CD Drive	24x CD-ROM	24x CD-ROM
Buttons	Modem	56.0 Kbps PCI data/fax	56.0 Kbps PCI data/fax


Left Side
Left Side
Components	System	32-MB	32-MB
	Memory
Right Side	Memory	3800 MAH NiMH	3800 MAH NiMH
Right Side	Battery
Components	Battery


Bottom of
Unit
Unit		Model 1277	Model 1278
	Display	13.0" HPA	12.1" HPA
Rear	Display	13.0" HPA	12.1" HPA
Connectors	Processor		AMD-K6II MMX 433-Mhz
		AMD-K6II MMX 400-Mhz
Power		AMD-K6II MMX 400-Mhz
Management		(or)
for Windows		AMD-K6II MMX 433-Mhz
for Windows
98
	Hard Drive	4.8-GB	4.8-GB
	Hard Drive	4.8-GB	4.8-GB
	CD Drive	24x CD-ROM	24x CD-ROM
	Modem	56.0 Kbps PCI data/fax	56.0 Kbps PCI data/fax
	System	64-MB	64-MB
	Memory
	Battery	3200 MAH sLION	3200 MAH sLION



		Model 1279
	Display	12.1" HPA
	Processor

AMD-K6II MMX 433-

Mhz

Hard Drive	4.8-GB
CD Drive	24x CD-ROM
Modem	56.0 Kbps PCI data/fax
System	64-MB
Memory
Battery	3200 MAH sLION

Maintenance & Service Guide

Presario Series

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

Product Description

Controls and Lights

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

Presario Series

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

Product Description

Front Bezel Lights

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.Power

Light

2.Battery

Charge

Light

3.Power

Cord Light

4.Num Lock Light

5.Cap Lock

Light

6.Scroll Lock Light

Maintenance & Service Guide

Presario Series

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

Product Description

Front Bezel Buttons

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.Instant Internet Access Button

2.Instant Search Button

3.Volume Down Button

4.Scroll Up/Down Button

5.Volume Up Button

6.Secure

E- Commerce Button

(or favorite Web site)

7.Instant E-Mail Button

Maintenance & Service Guide

Presario Series

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

Product Description

Left Side Components

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. PC Card Eject Lever

2. PC Card Slot

3. Diskette Drive Slot

4. Diskette Eject Button

Maintenance & Service Guide

Presario Series

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

Product Description

Right Side Components

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.Battery Compartment

2.CD Drive Eject Button

3.CD Drive Manual Eject Hole

Maintenance & Service Guide

Presario Series

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

Product Description

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

Bottom of

Unit

1. Memory

Compartment

Door

2. Stand Feet

Maintenance & Service Guide

Presario Series

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

Product Description

Rear Connectors

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. AC Adapter

2. Universal

Serial Bus

3. Security Slot

4. Serial Port

5.External Monitor Port

6.Parallel Printer Port

Keyboard/Mouse Port

8. Modem Jack

Maintenance & Service Guide

Presario Series

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

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

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:	Never	15 minutes

Turn OFF Monitor	After 3 hours	Never

Always on System Standby:	After 15 minutes	After 10 minutes

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:

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 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	Manual keys combination-	Press any	Flashing green Power
	Fn+F4	key	LED
	Time Out Default 15 minutes. If
	on Battery power (system will
	not go to Sleep if on AC power)
Hibernate	Manual - Press Power button	Press Power	No Power LED, blank
	once	button once	screen

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

Off	Perform normal Windows	Press Power	No Power LED, blank
	shutdown via the start button, or button once		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 Battery Pack Operations.

Top of Page

Maintenance & Service Guide

Presario Series

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

Troubleshooting

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 Preliminary Steps.

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 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.

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

Maintenance & Service Guide

Presario Series

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

Troubleshooting

Preliminary Steps

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

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, clear the password .

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.

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.

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.

Maintenance & Service Guide

Presario Series

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

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 battery pack.

4. Remove the Palmrest Cover with Touch Pad.

5. Remove the heatspreader.

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

Presario Series

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

Troubleshooting

Power-On Self Test (POST)

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
02h
03h
04h
06h
08h
09h
0Ah
0Bh
0Ch
0Eh
0Fh
10h
11h
12h
13h
14h
16h	1-2-2-3
17h
18h
1Ah
1Ch
20h	1-3-1-1
22h	1-3-1-3
24h
26h
28h
29h
2Ah
2Ch	1-3-4-2
2Eh	1-3-4-3
2Fh
30th	1-4-1-1
32h
33h
36h
38h
3Ah
3Ch
3Dh
42h
45h
46h	2-1-2-3
48h
49h
4Ah
4Bh
4Ch
4Eh
50Eh
51h
52h
54h
58h	2-2-3-1
59h
5Ah
5Bh
5Ch
60h
62h
64h
66h
67h
68h
69h
6Ah
6Bh
6Ch
6Eh
70h
72h
76h
7Ch
7Eh
80h
81h
82h
83h
84h
85h
86h
87h
88h
89h
8Ah
8Bh
8Ch
81h
90h
91h
92h
93h
95h
96h
97h
98h	1-2
99h
9Ah
9Ch
9Dh
9Eh
9Fh
A0h
A2h
A4h
A8h
AAh
ACh
AEh
B0h
B2h
B4h	1
B5h
B6h
B9h
BAh
BBh
BCh
BDh
BEh
BFh
C0h
C1h
C2h
C3h
C4h
C5h
C6h
C7h
C8h
C9h
D2h

POST Routine Description

Verify Real Mode

Disable Non-Maskable Interrupt (NM)

Get CPU type

Initialize system hardware

Initialize chipset with Initial POST values

Set IN POST flag

Initialize CPU registers

Enable CPU cache

Initialize caches to initial POST values

Initialize I/O component

Initialize the local bus IDE

Initialize Power Management

Load alternate registers with initial POST values

Restore CPU control word during warm boost

Initialize PCI Bus Mastering devices

Initialize keyboard controller

BIOS ROM Checksum

Initialize cache before memory autosize

8254 timer initialization

8237 DMA controller initialization

Reset Programmable Interrupt Controller

Test DRAM refresh

Test 8742 Keyboard Controller

Set ES segment register to 4 GB

Enable A20 line

Autosize DRAM

Initialize POST Memory Manager

Clear 512 KB base RAM

RAM failure on address line xxxx*

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

Enable cache before system BIOS shadow

RAM failure on data bits xxxx*of high byte memory bus

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

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

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

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

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 checksum failure

Check for SMART drive (optional)

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

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)

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		Initialize the chipset
E1h		Intitialize the bridge
E2h		Initialize the CPU
E3h		Initialize system timer
E4h		Initializesystem I/O
E5h		Check force recovery boot
E6h		Checksum BIOS ROM
E7h		Go to BIOS
E8h		Set Huge Segment
E9h		Initialize Multi Processor
EAh		Initialize OEM Special code
EBh		Initialize PIC and DMA
ECh		Initialize Memory type
EDh		Initialize Memory size
EEh		Shadow Boot Block
EFh		System memory test
F0h		Initialize interrupts vectors
F1h		Initialize Run Time Clock
F2h		Initialize Video
F3h		Initialize beeper
F4h		Initialize boot
F5h		Clear Huge segment
F6h		Boot to Mini DOS
F7h		Boot to Full DOS

Maintenance & Service Guide

Presario Series

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

Troubleshooting

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 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

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

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

proceed with the remaining steps.

For the removal and replacement of a particular subassembly, see Removal and Replacement Procedures.

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
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	Description		Recommended Action
	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.	2.	Replace the system board and retest.
		2.	Replace the system board and retest.
203-xx	Write/Read test failed.	1.	Remove the memory module and retest.
204-xx	Address test failed.	2.	Install a new memory module and retest.
211-xx	Random pattern test failed.	2.	Install a new memory module and retest.
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	If disconnected, turn off the computer and
301-xx	Failed Selftest/Interface Test	connect the keyboard.
302-xx	Failed Individual Key Test	2.	Replace the keyboard and retest.
		2.	Replace the keyboard and retest.
304-xx	Failed Keyboard Repeat Test	3.	Replace the system board and retest.
		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	4.	Check port and IRQ configuration.
		5.	Replace the system board and retest.

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

501-xx

502-xx

503-xx

504-xx

505-xx

506-xx

507-xx

508-xx

509-xx

510-xx

511-xx

512-xx

514-xx 516-xx

600-xx

601-xx

602-xx

603-xx

604-xx

605-xx

606-xx

609-xx

610-xx

697-xx

698-xx

699-xx

Failed Video Controller Test	1.	Disconnect external monitor and test with
Failed Video Memory Test	internal LCD display.
Failed Video Memory Test
Failed Video Attribute Test	2.	Replace the display assembly and retest.
Failed Video Character Set Test	2.	Replace the display assembly and retest.
Failed Video Character Set Test
Failed Video 80 x 25 mode 9 x 14 Character Cell	3.	Replace the system board and retest.
Test
Failed Video 80 x 25 mode 8 x 8 Character Cell
Test
Failed Video 40 x 25 Mode 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
Failed Video Noise Pattern Test
Diskette Drive Test
Failed Diskette ID Drive Types Test	1.	Replace the diskette media and retest.
Failed Diskette Format	2.	Check and/or replace the diskette power
Failed Diskette Read Test	and signal cables and retest.
Failed Diskette Read Test
Failed Diskette Write/Read/Compare Test	3.	Replace the diskette drive and retest.
Failed Diskette Random Read Test	4.	Replace the system board and retest.
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
Diskette drive/media ID error	1.	Replace media.
	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	Failed Hard Drive Format Test
1702-xx	Failed Hard Drive Read Test
1703-xx	Failed Hard Drive Write/Read/Compare Test
1703-xx
1704-xx	Failed Hard Drive Random Seek Test
1705-xx	Failed Hard Drive Controller Test
1706-xx	Failed Hard Drive Ready Test
1707-xx	Failed Hard Drive Recalibration Test
1708-xx	Failed Hard Drive Format Bad Track Test
1708-xx
1709-xx	Failed Hard Drive Reset Controller Test
1709-xx
1710-xx	Failed Hard Drive Park Head Test
1715-xx	Failed Hard Drive Head Select Test
1716-xx	Failed Hard Drive Conditional Format Test
1716-xx
1717-xx	Failed Hard Drive ECC* Test
1719-xx	Failed Hard Drive Power Mode Test
1724-xx	Failed Network Preparation Test
1736-xx	Failed Drive Monitoring Test

*ECC = Error Correction Code

1. Run the Configuration and Diagnostics 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.

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

2402-xx

2403-xx

2404-xx

2405-xx

2406-xx

2408-xx

2409-xx

2410-xx

2411-xx

2412-xx

2414-xx

2416-xx

2418-xx

2419-xx

2421-xx 2422-xx

2423-xx

2424-xx

2425-xx

2431-xx 2432-xx 2448-xx

2451-xx 2456-xx

2458-xx

2468-xx

2477-xx

2478-xx 2480-xx

3206-xx

8601-xx 8602-xx

3301-xx

3305-xx

6600-xx

6605-xx

6608-xx 6623-xx

Failed Video Memory Test

Failed Video Attribute Test

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

Failed Video Noise Pattern Screen

Failed ECG/VGC Memory Test

Failed ECG/VGC ROM Checksum Test

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

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

Failed 132-Column Advanced VGA Test Failed Advanced VGA 256 Color Test

Advanced VGA BitBLT Test

Advanced VGA DAC Test

Advanced VGA Data Path Test

Advanced VGA BitBLT Test

Advanced VGA LineDraw Test

1.Run the Configuration and Diagnostics Utilities

2.Replace the display assembly and retest.

3.Replace the system board and retest.

1.Run the Configuration and Diagnostics Utilities.

2.Disconnect external monitor and test with internal LCD display.

3.Replace the display assembly and retest.

4.Replace the system board and retest.

Replace the system board and retest.

Audio Test Error Codes

Audio System Internatl Error	Replace the system board and retest.
TouchPad/Pointing Device Interface Test Error Codes
Failed Mouse Test	1.	Replace the TouchPad and retest.
Failed Interface Test	2.	Replace the system board and retest.
CD Drive Test Error Codes
Failed CD Drive Read Test	1.	Replace the CD and retest.
Failed CD Drive Seek Test	2.	Verify that the speakers are connected.
Failed ID Test	3.	Verify that drivers are loaded and properly
Failed ID Test	installed.
	installed.
Failed Read Test	4.	Replace the CD drive and retest.
	4.	Replace the CD drive and retest.
Failed Controller Test	5.	Replace the system board and retest.
	5.	Replace the system board and retest.

Failed Random Read Test

Maintenance & Service Guide

Presario Series

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

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.

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

Maintenance & Service Guide

Presario Series

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

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

Computer does not beep after the Power-On

Self-Test (POST).

Probable Cause	Solution(s)
This is typical; it indicates successful	No action is required.
completion of the Power-On Self-Test
(POST).

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	Battery pack is discharged.	Connect the computer to an external
pack is inserted and power cord is		power source and charge the battery
unplugged.		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	Battery charge is low.	Immediately save any open file(s). Then
icon is blinking.		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.

Computer battery LED icon (front on the Volume is turned down too low. unit) blinks to indicate low battery

condition, but computer does not beep.

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

Battery pack was exposed to temperature extremes.

Battery pack is at end of its life.

You have to set the date and time every RTC battery is dead. time you turn on the computer.

Problem	Probable Cause
Battery charge does not last as long	Battery is being exposed to high
as expected.	temperatures or extremely cold
	temperatures.

Adjust the volume.

No action is necessary.

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

Replace battery pack. Replace the RTC battery.

Solution(s)

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 pack is warm to the touch after charging.

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

Battery has partially self-discharged.	Recharge the battery. Discharge the
	battery completely and then recharge it.
Power management is disabled.	Set a power management level in
	Computer Setup.
An external device or PC Card is draining	Turn off or disconnect external devices
the battery.	when not using them.
Normal warming has occurred due to	No action is required.
charging.
Power management is turned off or	Enable power management in Computer
disabled.	Setup and in Windows Power Properties.

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.

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	Open the CD loading tray, lay the
	improperly inserted in the CD drive.	compact disc in it (label side up), then
		close the tray.
	CD is CD Plus or Pregap/Track 0 type.	Cannot read these type CDs in 24x.
		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.

Diskette drive cannot read a diskette.

Cannot boot from diskette.

Computer is writing to the wrong drive.

Not enough space is left on the diskette.

Drive error has occurred.

Diskette is not formatted.

The wrong type of diskette is being used.

Diskette has a bad sector.

Drive error has occurred.

Diskette is not formatted.

Bootable diskette is not in drive A.

Diskette Boot has incorrect setting in Computer Setup.

Check the drive letter in the path statement.

Use another diskette.

Run Computer Checkup from the Compaq Diagnostics diskette.

Format the diskette. At the system prompt, enter FORMAT A:

Use the type of diskette required by the drive.

Copy files to hard drive or another diskette. Reformat bad floppy.

Run Computer Checkup from the Compaq Diagnostics diskette.

Format the diskette. At the system prompt, enter FORMAT A:

Put the bootable diskette in drive 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
Screen is dim.	Control for brightness or contrast (if
	applicable) is not set properly.

	Computer screen is in direct light.
Screen is blank.	Screen save was initiated by Power
	Management due to lack of user
	activity.

Solution(s)

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 (- ).

Tilt display or move computer.

Press any key or touch the Touch Pad.

	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	System is in Suspend mode.	Press any key or touch the Touch Pad.
flashing.
Internal display is blank and the screen	Display function was switched to the	Use Fn + F2 to switch between LCD or
on an external monitor displays	external monitor.	CRT.
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	Restart the computer.
resolution on external monitor
and have toggled back to
internal display, which
supports up to
800 × 600.

The light tubes on the edge of the display panel	Improper backlight or display	Replace the display assembly.
do not light up at all and Power-On Self-Test	cable connections
(POST) completes when the unit is powered
up.**
	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.
The light tubes on the edge of the display panel	Defective system board.	Replace the system board.
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	Improper display cable	1. Reseat the display cable to the
Fn + F7 (¯ ) or	connections.	system board.
Fn + F8 (- ).***
		2. Replace the display assembly.
	Defective inverter board.	Replace the display assembly.
	Defective display cable.	Replace the display assembly.
	Defective system board.	Replace the system board.
Contrast cannot be adjusted with	Improper display cable	1. Reseat the display cable to the
Fn + F5 (¯ ) or Fn + F6 (- ).	connections.	system board.
		2. Replace the display assembly.

Defective inverter board.

Defective display cable. Defective system board.

Replace the display assembly.

Replace the display assembly. Replace the system board.

** 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

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).

Ghost bars extending from graphics on the display.

Probable Cause	Solution(s)
Improper display cable	Reseat the display cable to the following
connections	until the problem is solved:
	1.	System board
	2.	Display assembly
Defective display cable.	Replace the display assembly.
Defective inverter board.	Replace the display assembly.
Defective system board.	Replace the system board.
Common characteristic of STN	1.	Change the background colors.
displays.
	2.	Adjust the Contrast of the display by
	using Fn + F5 or Fn + F6 .

A single line, small group of lines, or block	Defective display panel.	Replace the display assembly.
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.

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
Reading hard drive takes an unusually	System entered Hibernation due to
long time after restarting the computer.	low battery condition and is now
	exiting from it.
Hard drive error occurs.	Hard drive has bad sectors or has
	failed.
Hard drive does not work.	Hard drive is not seated properly.

Solution(s)

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

Run Computer Checkup.

Turn off and unplug the computer, 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

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

Probable Cause

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

Solutions(s)

Ensure that all cables are properly and securely connected.

Power switch of new external device is not turned on.

Device is not seated properly.

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

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	Num Lock function is not enabled.	Press the Shift+NumLk keys to
keyboard is disabled.		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	External numeric keypad is	Disconnect the external numeric
Num Lock function is on.	connected to the computer.	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	Optional memory expansion card	Ensure that the optional memory
(POST) is incorrect.	is installed incorrectly,	expansion card is installed correctly.
	is incompatible with the computer, or
	is defective.

"Out of Memory" message is displayed on the	System ran out of memory for the	Check the application documentation
screen or insufficient memory error occurs	application.	for memory requirements.
during operation.
		Install additional memory.

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

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

Maintenance & Service Guide

Presario Series

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

Troubleshooting

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, and click the

Global Settings tab; then,

enable PC Card sound effects.

Speaker is turned off or	Press volume buttons to turn
volume is turned down.	the speaker on; then, increase the
	volume.

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

PC Card drivers are not installed.

Card or card driver is not supported.

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

Double click the Add New 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-authorized

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

Ensure that the card is inserted in the correct orientation.

	Telephone cord is not	Check and secure telephone
	plugged in all the way.	connection.
	Necessary drivers are not	Install drivers.
	installed (turned on).
PC Card modem or fax card	You are trying to access the	See Specifications to verify
does not work.	card using the wrong COM	COM port.
	port.
	The card conflicts with a	See Specifications to verify
	serial device.	address.
	The card is not supported.	Use supported cards only.
Modem network PC Card does	Network driver is not	Install driver.
not work.	installed or is not set up
	properly.

Memory or storage card does not work.

Telephone cord is not 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 hard drive card using the wrong drive letter.

The card is not supported.

Verify telephone connection. Install driver.

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

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

Solving Power Problems

	Solving Power Problems
Problem	Probable Cause

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

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

Computer is not connected to a power source.

Power cords to the external power source are unplugged.

Power adapter is defective.

System board is defective.

System initiated Hibernation due to a critical low-battery condition.

System initiated Hibernation after a preset timeout.

Solution(s)

Insert battery or connect an external power source.

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

Replace AC Adapter and restart.

Replace the system board.

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

Turn on the computer.

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

Printer will not turn on.

Printer will not print.

Probable Cause

The signal cable may not be connected properly, or the printer is unplugged.

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.

Printer prints garbled information.	Correct printer drivers
	are not installed.

Cable is not connected properly.

Cable is defective.

Solution(s)

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

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.

Fill the paper tray with 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.

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.

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

Cursor skips or moves abnormally when using the Touch Pad.

Incorrect device drive, or no device driver is installed.

The device driver is not installed in Windows.

Mouse is not securely connected or is connected to an incorrect external connector.

Mouse is not enabled.

Cable not properly seated in Touch Pad board.

Defective Touch Pad board.

Defective system board.

Device driver is not correctly installed in Windows.

The Touch Pad needs to be cleaned.

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.

Enter MOUSE at the system prompt to activate the mouse device driver.

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

Reseat cable.

Replace Touch Pad board.

Replace system board.

Install the appropriate device driver in Windows.

Clean the Touch Pad with a cloth 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

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

Presario Series

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

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

Description		Spare Part
Description		Number
		Number
1. Keyboard

United States 141706-001

Palmrest

Cover

w/TouchPad

and 142654-

Button Board 001 (Models 1277

and 1278)

2. Palmrest Cover w/TouchPad

and Button 142653-001 Board

(Models: 1246, 1247, 1278)

2. Palmrest Cover

w/TouchPad 161416-001 (without Soft

Paint) (Model TBD)

3. Upper CPU

Cover w/Power 158799-001 Switch

4. Speaker

Assembly 148108-001 w/Cables

5. Base 158798-001 Enclosure

6. Battery Pack

LION Enhanced 388647-001

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