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Maintenance & Service GuidePresario 1800 Series

Models: 1825 and 1800T

|Home Page |Notice | Preface | Product Description | TroubleshootingIllustrated Parts Catalog | Removal & Replacement P rocedures|SpecificationsPin Assignments|Battery Pack Operations

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

LightsFront Bezel

Components

Left Side

Components

Right Side

Components

Bottom of

Unit

Back

Connectors

Port

Replicator

Components

Port

Replicator

Connectors

Power

Management

for Windows

Welcome to the Presario 1800 Series Maintenance and Service Guide. Thisonline guide is designed to serve the needs of those whose job it is to repairCompaq 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. Forcontent comments or questions, contact Tech Support..

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

Illustrated Parts Catalog | Removal & Replacement Procedures|Specifications

P in 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 OREDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTALOR 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 bephotocopied or reproduced in any form without prior written consent from Compaq

Computer Corporation.

1999 Compaq Computer Corporation.

All rights reserved. Printed in the U.S.A.

Compaq, Presario 1800 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 ornondisclosure agreement. The software may be used or copied only in accordance with

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Pin Assignments|Battery Pack Operations

Preface

This Maintenance and Service Guide is a troubleshooting guide that can be used for reference when

servicing the Compaq Presario 1800 Series Portable Computers.

Compaq Computer Corporation reserves the right to make changes to the Compaq Presario 1800Series Portable Computers without notice.

S y m b o ls

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 thewarning could result in bodily harm or loss of life.

CAUTION: Text set off in this manner indicates that failure to follow directions could result indamage 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 ofinformation.

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|Home Page |Notice | Preface | Product Description | TroubleshootingIllustrated Parts Catalog | Removal & Replacement Procedures|

Specifications


Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components

Right Side

Components

Bottom of

Unit

Back

Connectors

Port

Replicator

Components

Port

Replicator

CompaqPresario1800 SeriesPortable

Computersare a newgenerationofmultimediaportablecomputerswith a thin

and light-weightdesign,outstandingaudio andvideo,advancedcorefeatures,andattractivestyling.

The 1800TSeries

allowsconfigure-to-order (CTO)

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

Illustrated Parts Catalog | Removal & Replacement Procedures|SpecificationsPin Assignments|Battery Pack Operations

Troubleshooting

Preliminary

Steps

Clearing the

Power-On

Password

Power-On Self

Test (POST)

Compaq

Diagnostics

Diagnostic Error

Codes

Troubleshooting

WithoutDiagnostics

Solving Minor

Problems

Contacting

Compaq

Support

This section covers troubleshooting information for the Compaq Presario 1800 SeriesPortable 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 youare 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 remainingrecommended actions.

NOTE:If the problem is intermittent, check the computer several times toverify that the problem is solved.
http://www.compaq.com/copyright.html

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I llustrated Parts Catalog | Removal & Replacement Procedures|Specifications


I llustrated 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 of spare parts and

identifies the spare part ordering number associated witheach item for Compaq Presario 1800 Series PortableComputers.

Maintenance & Service Guide

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Removal and Replacement Procedures

This section explains the removal and replacement procedures for the computer.

S e r ia l N u m b e r Lo c a t io n

RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

TouchPad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

Modem

Hard Drive

Report the computer serial number to Compaq when requesting information orordering spare parts. The serial number is located on the underside of thecomputer.

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Specifications

This section covers the following specifications of Compaq Presario 1800 Series PortableComputers:

q Physical and Environmental

q System Interrupts

q System DMA

q System I/O Address

q System Memory Catalog

q Display

q Memory Expansion

q Diskette or LS120 Drive

q Hard Drive

q DVD or CD drive

q Battery Pack

P h y s ic a l a n d En v iro n m e n t a l

C t S ifi ti Maintenance & Service Guide
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Connector Pin Assignments

This section provides connector pin assignment tables for Compaq Presario 1800 Series Portable

Computers. For more information on connectors, refer to the sections on Back Connectors and PortReplicator Connectors.

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

Parallel Connector

P in Signal P in Signal

1 Strobe* 10 Acknowledge*2 Data Bit 0 11 Busy

3 Data Bit 1 12 Paper Out

4 Data Bit 2 13 Select

5 Data Bit 3 14 Auto Linefeed*

6 Data Bit 4 15 Error*

7 Data Bit 5 16 Initialize Printer*

8 Data Bit 6 17 Select In*

9 Data Bit 7 18-25 Signal Ground

* = Active low

Top of Page

Serial ConnectorConnector P in Signal


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Battery Pack Operations

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

q Increasing battery pack operating timeq Conditioning a battery packq Disposing of a used battery pack

I n c re a s in g B a t t e ry P a c k O p e r a t in g T im e

Battery pack operating time differs depending on several variables. To avoid unnecessary replacement, consider the

following variables when determining how long a charged battery pack should last:

q Power management settings

q Hardware configuration

q Software applications

qInstalled options

q Display brightness

q Hard drive usage

q Changes in operating temperature

q Type and number of installed PC Cards

NOTE:The power consumption requirements for PC Cards vary widely. Some cards drain the battery packvery rapidly.

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

Minimizing the Energy Required

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

M i t & S i G id
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|Home Page |Notice | Preface | Product Description |TroubleshootingI llustrated Parts Catalog | Removal & Replacement Procedures|

Specifications


Models and Features

Models and

FeaturesControls and

Lights

Internet

Zone

Buttons and

LightsFront Bezel

Components

Left Side

Components

Right Side

Components

Bottom of

Unit

Back

Connectors

PortReplicator

C t

Compaq Presario 1800 Series Portable Computer Models

Model 1825Display 15.0" TFT

Processor Pentium II/366-MHz w/256 Cache

Hard Drive 6.4-GB

CD or DVD Drive 4x DVD Drive

Diskette Drive 3.5" Floppy Drive

Modem 56.0 Kbps Data/Fax with PCI

Networking 10/100TX Integrated Ethernet

Battery sLi ion

System Memory 64 MB

Model 1800T CTO (Configure to Order)

Display

Processor

14.1 " TFT

Celeron 400-MHz w/128 Cache

M i t & S i G id

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Specifications


Product Description

Models and

FeaturesControls andLights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components

Right Side

ComponentsBottom of

Unit

Back

Connectors

Port

Replicator

Components

Controls

andLights

1. DisplayReleaseLatch

2. Display3. Power(On/Off)Button

4.Keyboard

5. TouchPad

6.IntegratedSpeakers

7. TouchPad

Button(Left)


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Il lustrated Parts Catalog | Removal & Replacement Procedures|Specifications


Product Description

Models and

Features

Controls and

Lights

InternetZoneButtons andLights

Front Bezel

Components

Left SideComponents

Right Side

Components

Bottom of

Unit

BackConnectors

Port

Replicator

Components

Port

ReplicatorConnectors

Internet Zone

Buttons andLights

1. AC AdapterLight

2. Cap Lock Light

3. InstantInternet AccessButton

4. Instant E-MailButton

5. My PresarioInstant AccessButton

6. Power Button

7. Instant SearchButton

8. OnlineMarketplaceButton (US/PuertoRico), InstantAnswer Button(countries outsidethe US)

9 Retail Central


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Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

ComponentsLeft Side

Components

Right Side

Components

Bottom of

UnitBack

Connectors

Port

Replicator

Components

PortReplicator

Front BezelComponents

1. PreviousTrack Button

2. Next TrackButton

3. Sleep StatusIcon

4. Power StatusIcon

5. BatteryCharging StatusIcon

6. DisqPlayStatus Icon

7. BatteryGauge

8. DisqPlayOn/Off Button

9. VolumeDown Button

10.Volume UpButton

11 Pl /P


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Specifications


Product Description

Models and

Features

Controls and

LightsInternet

Zone

Buttons and

Lights

Front Bezel

Components

Left SideComponents

Right Side

Components

Bottom of

Unit

Back

Connectors

Port

Replicator

Components

Port

Replicator

Connectors

Le f t S id e

Co m p o n e n t s

w it h

D i s k e t t e

Drive

1. Security Slot

2. CD or DVDDrive

3. CD or DVDDrive Eject Button

4. CD or DVDDrive Manual EjectHole

5. Diskette Drive

6. Diskette DriveEject Button

Left Side

Components with

LS120 Drive


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Product Description

Left Side Componentswith LS120 Drive

1. Security Slot

2. CD or DVD Drive

3. CD or DVD Drive EjectButton

4. CD or DVD Drive Manual

Eject Hole5. LS120 Drive

6. LS120 Drive EjectButton

7. LS120 Drive Manual

Eject HoleBack to Left Side Components with

Diskette Drive


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Presario 1800 SeriesModels: 1825 and 1800T



Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components

Right SideComponents

Bottom of

Unit

Back

Connectors

Port

Replicator

Components

Port

Replicator

Connectors

Power


1. BatteryCompartment

2. PC Card EjectButton

3. PC Card Slot

4. HeadphoneJack

5. Microphone

Jack

6. Modem Port

7. Ethernet Port


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Illustrated P arts Catalog | Removal & Replacement Procedures|SpecificationsPin Assignments|Battery Pack Operations

Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components

Right Side

Components

Bottom ofUnit

Back

Connectors

PortReplicator

Components

Port

Replicator

Connectors

PowerManagement

for Windows

Bottom of Unit

1. Stand Feet

2. Serial Number

3. Memory

Compartment Door

Maintenance & Service GuideP i 1800 S i

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Illustrated P arts Catalog | Removal & Replacement Procedures|Specifications


Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components


Bottom of

Unit

BackConnectors

PortReplicator

Components

Port

Replicator

Connectors

Power

Management

for Windows

BackConnectors

1. Keyboard/MousePort

2. ACAdapter Connector

3. Parallel Port

4. Port ReplicatorConnector

5. Fan Vent

6. TV Out Connector

7. External MonitorPort

8. Serial Port

9. Universal SerialBus Port


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Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components

Right Side

Components

Bottom of

Unit

Back

Connectors

PortReplicatorComponents

Port

Replicator

ConnectorsPower

PortReplicatorComponents

1. PortReplicatorInterfaceConnector

2. PortReplicator GuidePosts


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Product Description

Models and

Features

Controls and

Lights

Internet

Zone

Buttons and

Lights

Front Bezel

Components

Left Side

Components

Right Side

Components

Bottom of

Unit

Back

Connectors

Port

Replicator

Components

Port

ReplicatorConnectors

PortReplicatorBack

Connectors



3. Power (ACAdapter) Connector



6. Parallel Port

7. Game Port8. Serial Port

9. External MonitorPort

10. S Video

11. (Composite)

TV Out


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Pow er Management for Windows 98

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

q Power Management Settingsq Hibernation Modeq Sleep Modeq Battery Operating Timeq Rebooting After a Lockupq Recovering From a Loss of Electrical Powerq Servicing the Computer - Full Off Mode

P o w e r M an a g e m e n t S e t t in g s

Differing patterns of computer use determine the level of power management. These different power management levelscan be activated based on the amount of time passed since the last system activity. System activity examples includekeyboard or mouse movement, DVD/CD playback (while under program control that monitors Sleep), and modem use.

Select different power settings or schemes through Power Management.The optional settings are Home/ Office Desk,Portable/ Laptop, and Always On. Change the following settings from the default settings:

q when the computer goes into Sleep (Standby) modeq when the screen times out and goes blankq when the hard drive goes into low power mode.

Each of these system components sleeps after the selected or default periods of inactivity. (The setting for hard drive mustbe less than or equal to the setting for System.)

IMPORTANT: If the computer is on a network, Compaq recommends System Standby be set to Never.

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

P o w e r Ma n a g e m e n t P ro p e r t ie s

Always on Plugged in Running on Batteries

System Standby Never 5 minutes


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Preliminary StepsBefore running POST, complete the following preliminary steps:

1. If a power-on password has been established, type the password and press theEnter 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 disconnectthe printer if you want to test it or use it to log error messages.

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 byrunning POST with and without the external device connected.

5. Install loopback plugs in the serial and parallel connectors if you would like to testthese 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 isconnected to an external AC power source.

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

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M d l 1825 d 1800T

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Power-On Self Test (POST)

R u n n in g P OS T

To run POST, complete these directions:

Turn off the computer, then turn on the computer. As soon as the Compaq logo appears press the ESC key to clear the logoand display the POST messages as they occur.

If POST does not detect any errors, the computer will not beep. This indicates successful completion of the POST test. POSThas 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.

NOTE:If the system is not functioning well enough to run POST, or if the display is not functioning well enough to showPOST error messages, refer to the Troubleshooting tables.

Pow er-On Self-Test Messages

102-System Board Failure

Probable Cause Recommended Action

DMA, timers, etc. Replace the system board.

162-System Options Not Set

Probable Cause Recommended Action

Configuration incorrect Run Computer Setup.CMOS reflects that an invalidconfiguration has been set.

Run Computer Setup.

RAM failure 1. Replace the memory modules.

2. Replace the system board.

Memory test data error 1. Replace the memory modules.

2. Replace the system board.

XX000YZZ RAM failure Replace the system board.


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Compaq Diagnostics

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

The Diagnostics menu includes the following utilities:

s Computer Checkup (TEST)s View System Information (INSPECT)s 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. RunComputer Checkup and select to save the device list to a file and to print or to save the log of errors. Run

the View System Information (INSPECT) utility and select to print or to save that information. Have thefiles or the printed information available when you call for support.

Co m p u t e r Ch e c k u p ( T ES T )

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

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

error messages.
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Specifications


Diagnostic Error Codes

Diagnostic error codes occur if the system recognizes a problem while running

the Compaq Diagnostic program. These error codes help identify possiblydefective subassemblies.

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

IMPORTANT: Retest the system after completing each step. If the problemhas been resolved, do not proceed with the remaining steps.

For the removal and replacement of a particular subassembly, see Removaland 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 Test600 through 699 Diskette or LS120 Drive Test



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Troubleshooting Without Diagnostics

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

contain troubleshooting information on:

Audio Memory

Battery PC Card

DVD or CD drive Power

Diskette or LS120 Drive Printer

Display TouchPad

Hard drive Keyboard/Numeric keypad

Hardware Installation

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

WARNING: To avoid a potential shock hazard during troubleshooting procedures, disconnect all powersources before removing the keyboard cover or the display bezel.

B e f o r e R e p l a c in g P a r t s

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

s Run Computer Setup after connecting external devices.s Verify that all required device drivers are installed.s Verify that all required changes have been made to the CONFIG.SYS file.s Verify that all required changes have been made to the AUTOEXEC.BAT file.s Verify that all printer drivers have been installed for each application.

Top of Page

Return to Troubleshooting

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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.

S o lv in g A u d io P ro b l e m s

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

Solving Audio P roblems

Problem Probable Cause Solution(s)

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

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

No action is required.

S o lv in g B a t t e r y P a ck a n d B a t t e r y Ga u g e P ro b le m s

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 batterypack is inserted and power cord isunplugged.

Battery pack is discharged. Connect the computer to an externalpower source and charge the batterypack.

Replace the battery pack with a fullycharged battery pack.

Check the battery connectors on thesystem board to verify they are evenly

spaced and that they are not bent orbroken.

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System Unit

Boards

DisplayAssembly

Mass Storage

Devices

Miscellaneous

Cable Kit

Miscellaneous

Hardware Kit

MiscellaneousPlastics Kit

Miscellaneous

Parts

Documentation

and Software

System Unit

Description Spare PartNumber

1. Keyboards

2. PalmrestCoverw/TouchPad andButton Board

138181-001

3. Upper CPUCover w/PowerSwitch

138183-001

4. SpeakerAssemblyw/Cables

138185-001

5. EnclosureBase

138182-001

6. Battery PackLi ion Enhanced

138184-001

LS120 EnclosureBase (notshown)

143925-001

Button BoardCover (not

shown)

143926-001

US 138180-001



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System Unit

Boards

Display

Assembly

Mass Storage

Devices

Miscellaneous

Cable Kit

Miscellaneous

Hardware Kit

Miscellaneous

Plastics Kit

Miscellaneous

Parts

Documentation

and Software

Boards

Description PartNumber

1. Heatspreader 159698-001

2. Battery Charger Board 138177-001

3. Modem

4. Processors

5. System Board 158804-

0016. Fan Assembly 138162-

001

7. Ethernet Card PCI 138164-001

8. Memory

9. Internet Button Board 138186-001

10 . LCD IndicatorModule

138187-001

56K Data/Fax w/o SRAM 400445-001

PII 366-MHz w/256K Cache 138173-001

S.O. DIMM, 64MB, PC100 122700-001



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Illustrated Parts Catalog

System Unit

Boards

DisplayAssembly

Mass Storage

Devices

Miscellaneous

Cable Kit

Miscellaneous

Hardware Kit

Miscellaneous

Plastics Kit

Miscellaneous

PartsDocumentation

and Software

Display Assembly

DescriptionSparePartNumber

1. Display

14.1"TFT/LVDS

138175-

001

2. Display15.0"TFT/LVDS

138176-001



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System Unit

Boards

Display

Assembly

Mass StorageDevices

Miscellaneous

Cable Kit

MiscellaneousHardware Kit

Miscellaneous

Plastics Kit

Miscellaneous

Parts

Documentation

and Software

Mass Storage Devices

DescriptionSpare PartNumber

2. Diskette Drives

3. CD/DVD Drives

6X DVD Drive (notshown)

158165-001

4.8-GB Hard Drive(not shown)

149371-001

24X 2C CD-ROMDrive (not shown)

143922-001

LS-120 Drive (notshown) 143927-001

6.4-GB Hard Drive 138179-001

1.44-MB Diskette Drive 138188-001

4X 2C DVD Drive 138178-001



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System Unit

Boards

Display

Assembly

Mass Storage

Devices

MiscellaneousCables Kit

Miscellaneous

Hardware Kit

Miscellaneous

Plastics Kit

Miscellaneous

Parts

Documentation

and Software

Miscellaneous Cables Kit

Miscellaneous Cables KitSpare Part Number: 138189-001

Description Quantity

1. Hard Drive Cable 1 each

2. CD/DVD Drive Cable 1 each

3. Diskette Drive Cable 1 each

4. Status Panel Cable 1 each

5. LS120/CD-ROM(DVD)Cable

1 each

Modem Cable (not shown) 1 each

Touch Pad Cable (not shown) 1 each

Network Interface Card Cable(not shown)

1 each



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System Unit

Boards

Display

Assembly

Mass Storage

Devices

Miscellaneous Cable Kit


Miscellaneous

Plastics Kit

Miscellaneous

Parts

Documentation

and Software



Spare Part

Number: 138160-001


1. Hard DriveMountingBracket (right)

1 each

2.Hard DriveMountingBracket (left)

1 each

3.ReinforcementBracket

1 each



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System Unit

Boards

Display

Assembly

Mass Storage

Devices

Miscellaneous

Cable Kit

Miscellaneous

Hardware Kit


MiscellaneousParts

Documentation

and Software


MiscellaneousP lastics KitSpare Part

Number:138190-001


1. Door,Battery Pack

1 each

2. Cover,MemoryModule

1 each

3. Door,PCMCIA

1 each

4. DisplayHingeCover,(Right)

1 each

5. DisplayHingeCover,(Left)

1 each

6. CDDriveGuide

1 each

7. Latch,(Right)

10 each



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|Home Page |Notice | Preface | Product Description | TroubleshootingIllustrated Parts Catalog | Removal & Replacement P rocedures|Specifications



System Unit

Boards

Display

Assembly

Mass Storage

Devices

Miscellaneous

Cable Kit

Miscellaneous

Hardware Kit

Miscellaneous

Plastics Kit

MiscellaneousParts

Documentationand Software

Use the scroll down menu for the description

and spare part number of spare parts NotShown.

Miscellaneous Parts

DescriptionSparePartNumber

1. AC Adapter 298239-001

2. Port

Replicator

138167-001

Miscellaneous Screw Kit (not shown) 138161-001



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System Unit

Boards

Display

Assembly

Mass Storage

Devices

Miscellaneous

Cable Kit

Miscellaneous

Hardware Kit

Miscellaneous

Plastics Kit

Miscellaneous

Parts

Documentationand Software

Documentation and Software

Description Spare Part Number

QuickRestore Kit 120222-001

Reference Guide 117894-001

Features Guide 120223-001

Quick Reference Guide Information Not Available

QuickFind for Windows* Information Not Available

*QuickFind is updated monthly. To complete the QuickFind part

number, add the suffix from the table below for the desiredmonth. If you do not specify the 3-digit suffix, the default is thecurrent month in which the order is placed.

QuickFind P art Number Suffix

Suffix Month Suffix Month

-001 January -007 July-002 February -008 August

-003 March -009 September

-004 April -010 October

-005 May -011 November

-006 June -012 December



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|Home Page |Notice | Preface | Product Description |

TroubleshootingI llustrated Parts Catalog | Removal & Replacement Procedures|

Specifications


Electrostatic Discharge

A sudden discharge of static electricity from a finger or other conductor candestroy static-sensitive devices or microcircuitry. Often the spark is neither

felt nor heard, but damage occurs. An electronic device exposed toelectrostatic discharge (ESD) may not seem to be affected at all and will workperfectly throughout a normal cycle. Although, it may function normally for awhile, it may be degraded in the internal layers, reducing its life expectancy.

Networks built into many integrated circuits provide some protection, but in

many cases, the discharge contains enough power to alter device parametersor melt silicon junctions.

Generating Static

The table shows how different activities generate static electricity at differentelectrostatic voltage levels.

Typical Electrostatic Voltages

Relative Humidity



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Service ConsiderationsListed below are some of the considerations that you should keep in mind during the disassemblyand assembly of the computer.

To o l a n d S o f t w a re R e q u ire m e n t s

To service the computer, you need the following:

q Torx T-8 or T-9 screwdriverq 5mm nut drivers (for screwlocks and standoffs)q Small standard screwdriverq Small Phillips screwdriverq Diagnostics software

S c r e w s

The screws used in the computer are not interchangeable. If an incorrect screw is used during thereassembly process, it can damage the unit. Compaq strongly recommends that all screwsremoved during disassembly be kept with the part that was removed, then returned to theirproper locations.

IMPORTANT:As each subassembly is removed from the computer, it should be placed awayfrom the work area to prevent damage.

Return to Removal & Replacement P rocedures



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Cables and Connectors

Most cables used throughout the unit are ribbon cables. Cables must be handled with extreme care to avoid damage.

Apply only the tension required to seat or unseat the cables during insertion or removal from the connector. Handlecables by the connector whenever possible. In all cases, avoid bending, twisting, or tearing the cables, and ensurethat the cables are routed in such a way that they cannot be caught or snagged by parts being removed or replaced.

C a b l e s

Use the following precautions when handling cables to avoid damage to the cable or computer:

q Always handle cables by their connectors.q Avoid bending, twisting, or pulling on the cables.q Apply minimum required force when seating or unseating the cables from their connectors.q Place the cables in such a manner that they cannot be caught or snagged by parts being removed

or replaced.q Handle flex cables with extreme care; they can tear easily.

CAUTION: When servicing these computers, ensure that cables are placed in their proper locationduring the reassembly process. Improper cable placement can cause severe damage to the unit.

S e le c t t h e d e s ire d i llu s t ra t io n .

Removing a cable from a ZIF Connector.

The ribbon cable position for the hard drive.

The ribbon cable position for the DVD or CD drive.

The ribbon cable position for the diskette drive.



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The computer uses a zero insertion force(ZIF) connector for the keyboard cable to thesystem board. To remove a cable from a ZIFconnector, lift both corners of the ZIFconnector and slide simultaneously with

constant light force.

CAUTION: A ZIF connector andits attached cable can be easilydamaged. Handle only the

connector slide when removingor replacing a cable. Never pullor twist on the cable while it isconnected.

CAUTION: When servicing thiscomputer, ensure that cablesare placed in their properlocation during the reassemblyprocess. Improper cableplacement can damage thecomputer.

Back to Cables and Connectors.



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Specifications


The ribbon cable position for the hard drive.




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Specifications


The ribbon cable position for the DVD or CD drive.


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Specifications


The ribbon cable position for the LS120 drive.




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The cable position for the modem.




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Specifications


The cable position for the Network Interface Card.




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TroubleshootingIllustrated Parts Catalog | Removal & Replacement Procedures|

Specifications


The ribbon cable position for the keyboard.

I




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Troubleshooting



Preparing the Computer for Disassembly

Removal

Sequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing theComputer forDisassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Before beginning Removal & Replacement Procedures, complete the following

steps:

1. Disconnect AC power and any external devices.

2. Remove the battery pack.

3. Remove any PC Cards.

4. Remove the Port Replicator.

IMPORTANT:The battery pack should be removed before performing any

internal maintenance on the computer.

WARNING: Metal objects can damage the battery pack as well asthe battery contacts in the battery compartment. To prevent

damage, do not allow metal objects to touch the battery contacts.Place only the battery pack for the Compaq Presario 1800 Series


http://www.compaq.com/athome/support/msgs/1800t-1825/portr.htmlhttp://www.compaq.com/athome/support/msgs/1800t-1825/portr.html

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I llustrated Parts Catalog | Removal & Replacement Procedures|SpecificationsP in Assignments|Battery Pack Operations

Removal & Replacement Procedures

RemovalSequence

ElectrostaticDischarge

Service

Considerations

Cables and

Connectors

Preparing theComputer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch PadKeyboard

Status Panel

Internet

Button Board

Heatspreader

Network

R e m o v in g

t h e

B a t t e r y

P a c k

To remove thebattery pack,complete thefollowing steps:

1. Slide thebattery packcompartmentdoor down andremove it fromthe chassis.

2. Pull the

battery packfrom the chassisby the tablocated on theend of thebattery pack.

To replace thebattery pack,



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Specifications



RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer forDisassembly

Battery Pack

PalmrestCover w ithTouchPad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface CardM d

Removing thePalmrestCover withTouchPad

NOTE:

It is notnecessaryto removethe displaypanelassembly toaccess the

interiorcomponentsof thecomputer.

To remove thepalmrest cover withtouchpad, completethe following steps:

1. Prepare the

computer for

disassembly.

2. Close the displayassembly and turnth t id



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Specifications



Removing the

Palmrest Cover withTouchPad, continued

4. Turn the computer rightside up.

5. Pull the display release

latches and open the displayassembly.

6. Lift up the front end of thepalmrest cover with touchpadand remove it from thegroove in the chassis.

Next Step



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Removing the Palmrest Cover with

TouchPad, continued

7. Disconnect the flex cable from the LIF connectoron the DisqPlay Module.

To replace the palmrest cover with touchpad, reversethe previous procedures.

CAUTION:When replacing the palmrestcover with touch pad, ensure that theflex cable is fully inserted into the LIFconnectors on both ends. If the metalends should come in contact with thekeyboard, damage may occur to thecomputer.

Return to Removal & Replacement Procedures



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

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Specifications



RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the


Battery Pack

Palmrest

Cover w ith

Touch Pad

KeyboardStatus Panel

Internet

Button Board

Heatspreader

Network

Interface Card

R e m o v in g

t h e

K e y b o a r d

To remove thekeyboard, completethe following steps:

1. Prepare the

computer for

disassembly.

2. Remove the

palmrest cover with

touch pad.

3. Gently lift up thefront of thekeyboard and

disconnect the flexcable from the ZIFconnector on thesystem board andremove thekeyboard.

Whenreplacing



| H P | N ti | P f | P d t D i ti | T bl h ti

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RemovalSequence


Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

R e m o v in g

t h e S t a t u s

P a n e l

A s s e m b ly

NOTE:

Illustrationsmay showpartsremovedthat are not

part of thisprocedure.It isnecessaryto removeonly theparts listedin the

writtenprocedure.

To remove thestatus panelassembly, completethe following steps:

1. Prepare the



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TroubleshootingI llustrated Parts Catalog | Removal & Replacement Procedures|Specifications



R e m o v in g t h e

S t a t u s P a n e l

A s s e m b ly ,c o n t i n u e d

3. Remove two innermostscrews from the displayassembly hinges which secure

the status panel to thechassis.

Next Step




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Illustrated Parts Catalog | Removal & Replacement Procedures|

Specifications



R e m o v in g t h e S t a t u s

Pa n e l A s s e m b ly ,

c o n t i n u e d

4. Turn the unit upside down andremove two screws located in the backthat secure the status panel assemblyto the chassis.

Next Step

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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

InternetButton Board

Heatspreader

Network

Interface Card

Modem

Hard Drive

Removing theInternet ButtonBoard

NOTE:

Illustrationsmay show

partsremovedthat are notpart of thisprocedure.It is

necessaryto removeonly theparts listedin thewrittenprocedures.

To remove theInternet Buttonboard, completethe followingsteps:

1. Prepare the




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| g | | | p |


Specifications



Removing the

Internet Button

Board, continued

4. Remove two screwssecuring the Internet ButtonBoard and remove from thechassis.

To replace the Internet ButtonBoard, reverse the previousprocedures.

Return to Removal &

Replacement Procedures




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g | p | p



RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

PalmrestCover with

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

Modem

Hard Drive

DisqPlay

Module


H e a t s p r e a d e r

To remove the heatspreader,complete the following steps:

1. Prepare the computer for

disassembly.

2. Remove the palmrestcover with touch pad.

3. Remove the keyboard.

4. Remove four screws from

the heatspreader and lift outof the chassis.

NOTE:

If the thermal padson the heatspreaderare missing ordamaged, a newheatspreader shouldbe installed.

IMPORTANT:

Beforeinstalling thenewheatspreader,remove theplasticcovering fromthe thermal

pads.



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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors


Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

R e m o v in g

t h e

N e t w o r k

I n t e r f a c e

Card

To remove theNetworkInterface Card(NIC), completethe following

steps:

1. Prepare the

computer for

disassembly.

2. Remove the

palmrest cover

with touchpad.

3. Remove the

keyboard.

4. Remove theh t d



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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the


Battery Pack

Palmrest

Cover w ith

TouchPad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

R e m o v in g

t h e Mo d e m

To remove themodem, complete

the following steps:

1. Prepare thecomputer for

disassembly.

2. Remove the

palmrest cover withtouchpad.

3. Remove thekeyboard.

4. Remove the

status panel.

5. Remove theheatspreader.

6. Remove theNetwork Interface

Card.



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Illustrated Parts Catalog | Removal & Replacement Procedures|

SpecificationsPin Assignments|Battery Pack Operations


RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the


Battery Pack

Palmrest

Cover w ith

Touch Pad


Internet

Button Board

Heatspreader

Network

Interface Card

R e m o v in g

t h e Ha rd

Drive

NOTE:

Illustrationsmay showpartsremovedthat are notpart of thisprocedure.It isnecessaryto removeonly theparts listedin thewrittenprocedure.

To remove the harddrive, complete thefollowing steps:


disassembly.

2. Remove the




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TroubleshootingI llustrated Parts Catalog | Removal & Replacement Procedures|Specifications




Ha rd Dr iv e

M o u n t i n g B r a c k e t s ,

c o n t i n u e d

To remove the hard drivemounting brackets, completethe following step:

1. Remove two screws fromeach of the hard drivemounting brackets.

To replace the hard drive andhard drive mounting brackets,reverse the previousprocedures.

Return to Removal &

Replacement Procedures




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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

Modem

Hard Drive

DisqPlay

R e m o v in gt h e

DisqPlay

Modu le

NOTE:

Illustrationsmay show

partsremovedthat are notpart of thisprocedure.It isnecessaryto removeonly theparts listedin thewrittenprocedure.

To remove theDisqPlay Module,complete thefollowing steps:

1. Prepare the

computer for

disassembly.

2. Remove the

palmrest cover withtouch pad




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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

Modem

R e m o v in g

t h e

P r o c e s s o r

To remove the

processor, completethe following steps:

1. Prepare the

computer for

disassembly.

2. Remove thepalmrest cover with

touch pad.



5. Remove screw,lift the processor upoff the connector onthe system board,and slide the

processor fromunder the upper

Maintenance & Service GuidePresario 1800 SeriesModels: 1825 and 1800T



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R e p la c in g t h e P ro c e s s o r

To replace the processor complete the following steps:

IMPORTANT:When installing the processor, be sure that the system board connector fully aligns with the processorconnector.

1. Press down carefully on the processor directly overthe connectors to seat the processor.

2. Replace the screw.





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Specifications



RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the


Battery Pack

Palmrest

Cover w ith

Touch Pad


Internet

Button Board

Heatspreader

Network

Interface Card

R e m o v in g

t h e DV D o r

CD Driv e

To remove the DVDor CD drive,complete thefollowing steps:


disassembly.


touch pad.



5. Turn the unitover and removetwo screws from thebase enclosurewhich secure the

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Specifications




DVD o r CD Dr iv e ,

c o n t i n u e d

7. Disconnect the DVD or CDdrive cable from the DVD orCD drive and push forwardfrom the back of the DVD or

CD drive to remove from thechassis.

To replace the DVD or CDdrive, reverse the previousprocedures.

Return to Removal &Replacement Procedures


|Home Page |Notice | Preface | Product Description | TroubleshootingI llustrated Parts Catalog | Removal & Replacement Procedures|Specifications


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Removal

Sequence

Electrostatic

Discharge

Service

Considerations

Cables andConnectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover with

TouchPad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

Modem

Hard Drive

DisqPlay

Module

R e m o v in g

t h e D is p la yP a n e l

A s s e m b ly

NOTE:

Illustrationsmay showparts

removedthat are notpart of thisprocedure.It isnecessaryto removeonly theparts listed

in thewrittenprocedures.

To remove thedisplay panelassembly, completethe following steps:


disassembly.

2. Remove thestatus panel

assembly.



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R e m o v in g t h e Dis p la y

Pa n e l A s s e m b ly ,

c o n t i n u e d

4. Remove two outermost screws from

the display base hinges.

Next Step




T bl h ti
http://www.compaq.com/index.htmlhttp://www.compaq.com/worldwide/index.htmlhttp://www.compaq.com/support/index.htmlhttp://www.compaq.com/showroom/index.htmlhttp://www.compaq.com/search.htmlhttp://www.compaq.com/index.html

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Specifications



R e m o v in g

t h e Dis p la y

P a n e lA s s e m b ly ,

c o n t i n u e d

5. Remove thedisplay assemblyfrom the chassis.

To replace thedisplay panelassembly, reversethe previousprocedures.

Return to Removal

& Replacement

Procedures




Spe ifi tion

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RemovalSequence


Service

Considerations

Cables and

Connectors


Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

R e m o v in g

t h e Up p e r

CP U Co v e r

To remove the

upper CPU cover,complete thefollowing steps:


disassembly.


touch pad.




assembly.

6 Remove the




Specifications

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RemovalSequence

Electrostatic

DischargeService

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

R e m o v in g

t h e Fa n

A s s e m b ly

To remove the fan

assembly, completethe following steps:


disassembly.


touch pad.




assembly.

6 Remove theInte net B tton




Troubleshooting

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Specifications



R e m o v in g t h e Fa n

A s s e m b ly ,

c o n t i n u e d

To remove the fan gasket,complete the following step:

Pull the gasket from the fan.

To replace the fan assemblyand gasket, reverse theprevious procedures.

IMPORTANT:

Whenreplacing the

fan assemblyensure thearrow(located onthe side ofthe fan neartheconnector) ispointing



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Specifications

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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors


Disassembly

Battery Pack

Palmrest

Cover w ithTouch Pad

Keyboard

Status Panel

Internet

Button Board

R e m o v in g

t h e

D i s k e t t e

o r LS 1 2 0

Drive

To remove thediskette orLS120 drive,complete thefollowing steps:


disassembly.

2. Remove thepalmrest cover

with touch pad.



5 Remove the




Pin Assignments | Battery Pack Operations

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R e m o v in g t h e Dis k e t t e o r LS 1 2 0D riv e , c o n t in u e d

12. Remove the screw that connects the diskette orLS120 drive bracket to the chassis.

13. If you have a diskette drive, then disconnect thediskette drive data cable from the ZIF connector on the

system board and lift the diskette drive from thechassis.

If you have a LS 120 drive, then disconnect the LS120

drive data cable from the back of the drive and lift the

LS120 drive from the chassis.

CAUTION: Ensure that cables are placed intheir proper location during the reassembly

process.

To replace the diskette or LS120 drive, reverse theprevious procedures.





SpecificationsPin Assignments | Battery Pack Operations

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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

M d

R e m o v in g

t h e B a t t e ry

C h a r g e r

B oard

To remove thebattery chargerboard, complete thefollowing steps:


disassembly.


touch pad.




assembly.





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RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

Modem

Hard Drive

DisqPlay


S p e a k e r A s s e m b ly

To remove the speaker assembly,complete the following steps:

1. Prepare the computer for

disassembly.

2. Remove the palmrest cover

with touch pad.


4. Remove the heatspreader.

5. Remove the status panel

assembly.

6. Remove the Internet Button

board.

7. Remove the display panel

assembly.

8. Remove the hard drive.

9. Remove the Upper CPU cover.

10. Remove the battery charger

board.

11. Disconnect the speaker cablesfrom the system board and

remove the speaker assembly



SpecificationsPi A i t | B tt P k O ti

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pPin Assignments|Battery Pack Operations


RemovalSequence

Electrostatic

Discharge

Service

Considerations

Cables and

Connectors

Preparing the

Computer for

Disassembly

Battery Pack

Palmrest

Cover w ith

Touch Pad

Keyboard

Status Panel

Internet

Button Board

Heatspreader

Network

Interface Card

R e m o v in g t h e S y s t e m B o a rd

To remove the system board, complete the following steps:

1. Prepare the computer for disassembly.

2. Remove the palmrest cover with touchpad.


4. Remove the heatspreader.

5. Remove the status panel assembly.

6. Remove the Internet Button board.

7. Remove the display panel assembly.

8. Remove the hard drive.

9. Remove the Upper CPU cover.

10. Disconnect the DisqPlay module cable from the system board.

11. Remove the processor.



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19. Remove tenstandoffs from thesystem board.

Next Step




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20. Remove twoscrews from the DVDor CD drive mounting

rail and remove themounting rail fromthe system board.

Next Step

Maint

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HP / Compaq 1800t-1825

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