HP 1825, 1800T Service Manual

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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
Connectors

Welcome to the Presario 1800 Series Maintenance and Service Guide. This
online guide is designed to serve the needs of those whose job it is to repair
Compaq products. The

Preface shows symbol conventions, Technician Notes and Serial Number

The
locations on the unit.

Notice contains the copyright and trademark information.

Power
Management
for Windows
98

This MSG will be periodically maintained and updated online as needed. For
content comments or questions, contact Tech Support..

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

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Notice

The information in this guide is subject to change without notice.

COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR TECHNICAL OR
EDITORIAL ERRORS OR OMISSIONS CONTAINED HEREIN, NOR FOR INCIDENTAL
OR CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING,
PERFORMANCE, OR USE OF THIS MATERIAL.

This guide contains information protected by copyright. No part of this guide may be
photocopied or reproduced in any form without prior written consent from Compaq
Computer Corporation.

1999 Compaq Computer Corporation.
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 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 1800 Series Portable Computer

First Edition (August 1999)
Compaq Computer Corporation

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Preface

This Maintenance and Service Guide is a troubleshooting guide that can be used for reference when
servicing the Compaq Presario 1800 Series Portable Computers.

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

Symbols

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

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

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

IMPORTANT:

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

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

NOTE:

information.

Technician Notes

WARNING: Only authorized technicians trained by Compaq should repair this equipment. All
troubleshooting and repair procedures are detailed to allow only subassembly/module level
repair. Because of the complexity of the individual boards and subassemblies, the user should
not attempt to make repairs at the component level or to make modifications to any printed
circuit board. Improper repairs can create a safety hazard. Any indications of component
replacement or printed circuit board modifications may void any warranty

Serial Number

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

Locating Additional Information

The following documentation is available to support this product:

● Compaq Presario 1800 Series Portable Computer documentation set

● Introducing Windows 98 Guide

● Service Training Guides

● Compaq Service Advisories and Bulletins

● Compaq QuickFind

● Compaq Service Quick Reference Guide

Top of Page

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin 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 of
Unit

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

Compaq
Presario
1800 Series
Portable
Computers
are a new
generation
of
multimedia
portable
computers
with a thin
and light­weight
design,
outstanding
audio and
video,
advanced
core
features,
and
attractive
styling.

The 1800T
Series
allows
configure-to­order (CTO)
accessibility,
providing a
range of
outstanding
and
innovative
features and
components.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Preliminary
Steps

Clearing the
Power-On
Password

This section covers troubleshooting information for the Compaq Presario 1800 Series
Portable Computers. The basic steps in troubleshooting include:

1. Follow the

Preliminary Steps.

Power-On Self
Test (POST)

Compaq
Diagnostics

Diagnostic Error
Codes

Troubleshooting
Without
Diagnostics

Solving Minor
Problems

Contacting
Compaq
Support

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

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.

POST and

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit
Miscellaneous

Hardware Kit
Miscellaneous

Plastics Kit
Miscellaneous

Parts
Documentation

and Software

This section provides a breakdown of spare parts and
identifies the spare part ordering number associated with
each item for Compaq Presario 1800 Series Portable
Computers.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal and Replacement Procedures

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

Serial Number Location

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

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

Report the computer serial number
ordering spare parts. The serial number is located on the underside of the
computer.

to Compaq when requesting information or

Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Specifications

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

● Physical and Environmental

● System Interrupts

● System DMA

● System I/O Address

● System Memory Catalog

● Display

● Memory Expansion

● Diskette or LS120 Drive

● Hard Drive

● DVD or CD drive

● Battery Pack

Physical and Environmental

Dimensions

Height
Depth
Width

Computer Specifications

U.S. Metric

1.65 in

13.00 in

10.99 in

4.20 cm

33.00 cm

27.90 cm

Weight

Stand-Alone (Battery Pack) Power
Requirements

Nominal Operating
Maximum Average
Peak Operating

AC Power Requirements

Operating Voltage
Operating Current
Operating Frequency
Maximum Transient

7.9 lbs 3.58 kg

Li-ion 3.2 mAh

W @ 14.8 V
W @ 14.8 V
W @ 14.8 V

100-240 V

0.8/0.4 A RMS
47-63 Hz
Meets IEC 801-4 and IEC801-5
1kV for 50 ns

Temperature

Operating
Nonoperating

Relative Humidity (noncondensing)

Operating

Nonoperating (tw = 38.7°C max)

Altitude

Operating

Nonoperating

Shock

50° to 95 °F

-4° to 140 °F

90%

5% to 95%

0 to 10,000 ft

0 to 30,000 ft

10° to 35 °C

-20° to 60 °C

10% to 90%

5% to 95%

0 to 3.05 km

0 to 9.14 km

Operating

Non operating

Vibration

Operating

Nonoperating
NOTE: Applicable product safety standards specify thermal limits for plastic surfaces. Compaq Explorer

Series Portable Computers operate well within this range of temperatures.

Top of Page

System Interrupts

10 G, 11 ms, half sine

240 G, 2 ms, half sine

0.5 G

1.5 G

System Interrupts

Hardware IRQ System Function

IRQ0 System timer
IRQ1 Standard 101/102-key or Microsoft Natural Keyboard
IRQ2 Programmable interrupt controller
IRQ3 Lucent 56K V.90 PCI DF Modem
IRQ4 Communications Port (COM1)
IRQ5 ESS SOLO-1 PCI AudioDrive
IRQ5 RAGE LT PRO AGP 2X (English)
IRQ6 Standard Floppy Disk Controller
IRQ7 Printer Port (LPT1)
IRQ8 System CMOS/real time clock
IRQ9 Available
IRQ10 Available
IRQ11 Intel 21143/2 based 10/100 mbps Ethernet Controller
IRQ11 Texas Instruments PCI-1211 CardBus Controller
IRQ11 Intel 82371AB/EB PCI to USB Universal Host Controller
IRQ12 Synaptics PS/2 TouchPad
IRQ13 Numeric Data Processor
IRQ14 Intel 82371AB/EB PCI Bus Master Primary IDE Controller
IRQ15 Intel 82371AB/EB PCI Bus Master Secondary IDE Controller

Top of Page

System DMA

Hardware DMA System Function

DMA 1 ESS SOLO-1 DOS Emulation
DMA 2 Standard Floppy Disk Controller

System DMA

DMA 3 ECP Printer Port (LPT1)
DMA 4 Direct memory access controller

Top of Page

System I/O Address

System I/O Address

I/O Address (Hex) System Function (Shipping Configuration)

0000h-000Fh Direct memory access controller
0020h-0021h Programmable interrupt Controller`
0040h-0043h System timer

0060h-0060h

Standard 101/102-Key or Microsoft Natural
Keyboard

0061h-0061h System speaker

Standard 101/102-Key or Microsoft Natural

0064h-0064h

Keyboard
0070h-0071h System CMOS/real time clock
0072h-0073h Motherboard resources
0080h-0080h Motherboard resources
0081h-008Fh Direct memory controller
00A0h-00A1h Programmable interrupt controller
00C0h-00DFh Direct memory access Controller
00ECh-00EFh Motherboard resources
00F0h-00FFh Numeric data processor

Intel 82371AB/EB PCI Bus Master IDE
0170h-0177h

controller
0170h-0177h Secondary IDE controller (dual fifo)

Intel 82371AB/EB PCI Bus Master IDE
01F0h-01F7h

controller
01F0h-01F7h Primary IDE controller (dual fifo)

0200h-0203h Gameport Joystick
0220h-022Fh ESS SOLO-1 DOS Emulation
0330h-0331h ESS SOLO-1 DOS Emulation

Intel 82371AB/EB PCI Bus Master IDE
0376h-0376h

Controller
0376h-0376h Secondary IDE controller (dual fifo)
0378h-037Fh ECP Printer Port (LPT1)
0388h-038Bh ESS SOLO-1 DOS Emulation
03B0h-03BBh RAGE LT PRO AGP 2X (English)
03C0h-03Dfh RAGE LT PRO AGP 2X (English)
03E0h-03E1h Motherboard resources
03F0h-03F5h Standard Floppy Disk Controller

Intel 82371AB/EB PCI Bus Master IDE
03F6h-03F6h

Controller
03F6h-03F6h Primary IDE controller (dual fifo)
03F7h-03F7h Standard Floppy Disk Controller
03F8h-03FFh Communications Port (COM1)
04D0h-04D1h Motherboard resource
0CF8h-0CFFh PCI bus
2180h-218Fh Motherboard resources
8000h-803Fh Motherboard resources

Intel 82443BX Pentium ® II Processor to AGP
E000h-EFFFh

controller
E800h-E8FFh RAGE LT PRO AGP 2X (English)
F4D8h-F4DBh ESS SOLO-1 PCI AudioDrive
F4DCh-F4DFh ESS SOLO-1 PCI AudioDrive
F4E0h-F4Efh ESS SOLO-1 PCI AudioDrive
F4F0h-F4FFh ESS SOLO-1 PCI AudioDrive
F800h-F8FFh Lucent 56K V.90 PCI DF Modem

Intel 21143/2 based 10/100 mbps Ethernet
FC00h-FC7Fh

Controller
FC88h-FC8Fh Lucent 56K V.90 PCI DF Modem
FC90h-FC97h Primary IDE controller (dual fifo)

Intel 822371AB/EB PCI Bus Master IDE
FC90h-FC9Fh

Controller
FC98h-FC9F Secondary IDE controller (dual fifo)

FCA0h-FCBFh

Intel 82371AB/EB PCI to USB Universal Host

Controller
FCC0h-FCFFh ESS SOLO-1 PCI AudioDrive

Top of Page

System Memory Catalog

System Memory Catalog

Memory Address System Function

00000000h-0009FFFFh System board extension for PnP BIOS
000A0000h-000AFFFFh RAGE LT PRO AGP 2X (English)
000B0000h-000BFFFFh RAGE LT PRO AGP 2X (English)
000C0000h-000CBFFFh RAGE LT PRO AGP 2X (English)
000E0000h-000E7FFFh Motherboard resources
000E8000h-000FFFFFh System board extension for PnP BIOS
00100000h-03FFFFFFh System board extension for PnP BIOS
08000000h-08000FFFh Texas Instruments PCI-1211 CardBus Controller
F8000000h-FBFFFFFFh Intel 82443BX Pentium ® ll Processor to PCI

bridge
FD000000h-FDFFFFFFh RAGE LT PRO AGP2X (English)
FD000000h-FECFFFFFh Intel 82443BX Pentium ® ll Processor to AGP

controller
FE000000h-FE01FFFFh RAGE LT PRO AGP 2X (English)
FECFE000h-FECFFFFh RAGE LT PRO AGP 2X (English)
FEDFF800h-FEDFFBFFh Intel 21143/2 based 10/100 mbps Ethernet

Controller
FEDFFC00h-FEDFFCFFh Lucent 56K V.90 PCI DF Modem
FFF80000h-FFFFFFFFh Motherboard resources

Display

Dimensions

Height
Width

Display Dimensions

Height
Width
Depth

Weight

15.0" (Diagonal) TFT Display with LVDS
U.S. Metric

9.48 in

12.43 in

8.99 in

11.98 in
Information not available

24.36 oz 690 gm

24.05 cm

31.55 cm

22.81 cm

30.41 cm
Information not
available

Contrast Ratio
Brightness
Total Power Consumption

Top of Page

Dimensions
Height
Width

14.1" (Diagonal) TFT Display with LVDS

Display Dimensions
Height
Width
Depth

150:1 mini
120 cd/mm^3
Information not available

U.S. Metric

8.92 in

11.76 in

8.44 in

11.26 in
Information not
available

22.65 cm

29.85 cm

21.43 cm

28.57 cm
Information not
available

Weight 19.94 oz 565 gm
Contrast Ratio 150:1 mini
Brightness 120 cd/mm^3
Total Power Consumption Information not available

Top of Page

Memory Expansion

System Memory Expansion Board

64-MB
64-MB

Memory Expansion

Total Memory

Memory

64-MB

32-MB 96-MB

64-MB
64-MB

Diskette or LS120 Drive

Capacity per Diskette (High/Low)
Diskette Size
Number of LED Indicators (Read/Write)
Number of Drives Supported
Drive Rotation (rpm)
Transfer Rate (Kbps)

64-MB 128-MB
128-MB 192-MB

Diskette Drive LS120 Drive

1.44 MB/720KB 120 MB

3.5" 3.5"
0 1
1 1
300 720
500 5458

Bytes per Sector
Sectors per Track (High/Low)
Tracks per Side (High/Low)
Access Times

Track-to-Track (ms)
Average (ms)
Setting Time (ms)
Latency Average (ms)

Cylinders (High/Low)
Number of Read/Write Heads

Top of Page

Hard Drive

512 512
18/9
80

3
94
15
100

80 1736
2 2

20
112
800

41.67

Capacity Per Drive
Drive Type

Logical Configuration

Cylinders
Heads
Sectors per track
Bytes per sector

Seek Times
(Typical, Including settling in ms)
Single track
Average
Full stroke

Transfer Rate At Interface

Hard Drive

4.8-GB 6.4-GB 10.0-GB 18.0-GB

4.8-GB 6.4-GB 10.0-GB 18.0-GB

11648
3
190/330
512

8647
4
190/330
512

11968
6
190/330
512

16383
6
Not available
512

4
14
24

33.3 MB/s 33.3 MB/s 33.3 MB/s 33.3 MB/s

4
14
24

4
14
24

2.5 (Read)
12 (Read)
23 (Read)

Top of Page

CD/DVD Drive

Dimensions
Weight
Rotational Speed
Typical Transfer Rate

Sustained Data Transfer
Rate

Access Time

Average Random Access
Time

CD/DVD Drive

4x DVD 6x DVD 24x CD-ROM

128 x 129 x 12.7 mm 128 x 129 x 12.7mm 128 x 129 x 12.7 mm

0.27 kg 0.28 kg <0.27 kg
2300 rpm 3450 rpm 4225 rpm
5400 KB/s

8100 KB/s 3600 KB/s

140 ms

140 ms 120 ms

Spin Up time
Data Buffer Capacity

Top of Page

Battery Pack

Dimensions

Height
Length
Width

Weight

3.8 s <15 s 2.7 s
128 KB 512 KB 128 KB

Battery Pack

Lithium Ion (Li ion) *

0.8 in (20.3 mm)

5.7 in (145 mm)

3.1 in (78.7 mm)

0.90 lb (408.2 g)

Battery Pack Operating Time

2 hr 30 min*

Energy

Nominal Open Circuit Voltage
Capacity
Power

14.4 V
3200 mAH

46.1 WH

Environmental Requirements

Operating Temperature
Non-operating Temperature
Charging Temperature

32° F (0-50° C)

-20° C -60° C
5° C-45° C

*The battery operating time changes depending on your power management settings, system
components, options, and applications you use.

Top of Page

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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 Port

Replicator Connectors.

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

Parallel Connector

Pin Signal Pin Signal

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

Top of Page

Serial Connector

Connector Pin Signal

1

2

Carrier Detect

Receive Data

3

4

5

6

7

8

9

Keyboard/Mouse

Transmit Data

Data Terminal Ready

Signal Ground

Data Set Ready

Ready to Send

Clear to Send

Ring Indicator

Connector Pin Signal

1

2

3

4

5

6

Data 1

Data 2

Ground

+5 V

Clock 1

Clock 2

Top of Page

External VGA Monitor

Connector Pin Signal

1

2

3

4

5

6

7

8

Red Analog

Green Analog

Blue Analog

Not connected

Ground

Ground Analog

Ground Analog

Ground Analog

Top of Page

9

10

11

12

13

14

15

Universal Serial Bus

+5V

Ground

Monitor Detect

DDC2B Data

Horizontal Sync

Vertical Sync

DDC2B Clock

Connector Pin Signal

1

2

3

4

+5V
Data ­Data +
Ground

Top of Page

Modem

Connector Pin Signal

1

2

Unused

Tip

3

4

5

6

Ring

Unused

Unused

Unused

Top of Page

TV Out

Connector Pin Signal

1

2

Ground

Composite

3

Ground

Top of Page

Game Port

Connector Pin Signal

1

2

3

4

5

+5V

SWA

RBTA

GND

GND

6

7

8

9

10

11

12

13

14

RBTB

SWB

+5V

+5V

SWC

RBTC

RMSO

RBTD

SWD

15

RMSI

Top of Page

S Video

Connector Pin Signal

1

2

3

4

Ground

Ground

SYR

SCG

Top of Page

Port Replicator Connector

Pin Signal Pin Signal Pin Signal Pin Signal

1 Adapter Power 21 Serial Port CTS 41 Not Connected 61 Switch C
2 Adapter Power 22 Serial Port DCD 42 Power Cycle 62 Switch D
3 Adapter Power 23 Serial Port DSR 43 Keyboard Clock 63 MIDI Input
4 Adapter Power 24 Serial Port TXD 44 Keyboard Data 64 MIDI Output
5 Adapter Power 25 Serial Port RTS 45 Mouse Clock 65 Not Connected
6 Adapter Power 26 Monitor DDC 46 Mouse Data 66 USB Power
7 Not Connected 27 Monitor DDC 47 Lp Select 67 USB Power
8 Printer Data 0 28 Monitor Indicator 48 Lp Paper End 68 USB Power
9 Printer Data 1 29 V. SYNC 49 Lp Initialize 69 USB Power
10 Printer Data 2 30 Ground 50 Lp Busy 70 USB A­11 Printer Data 3 31 H.SYNC 51 Lp Error 71 USB A+
12 Printer Data 4 32 Ground 52 Lp Acknowledge 72 USB B­13 Printer Data 5 33 Blue 53 Lp AutoFeed 73 USB B+
14 Printer Data 6 34 Ground 54 Lp Strobe 74 5V
15 Printer Data 7 35 Green 55 Joystick Data A 75 5V
16 Lp Indicator 36 Ground 56 Joystick Data B 76 Not Connected
17 Port Replicator Dock

Indicator
18 Serial Port RXD 38 Ground 58 Joystick Data D 78 Ground
19 Serial Port RI 39 Composite TV Out 59 Switch A 79 S-Video SCG
20 Serial Port DTR 40 Not Connected 60 Switch B 80 Ground

37 Red 57 Joystick Data C 77 S-Video SYR

Top of Page

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Battery Pack Operations

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

● Increasing battery pack operating time

● Conditioning a battery pack

● Disposing of a used battery pack

Increasing Battery Pack Operating Time

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

● Power management settings

● Hardware configuration

● Software applications

● Installed options

● Display brightness

● Hard drive usage

● Changes in operating temperature

● Type and number of installed PC Cards

NOTE:

The power consumption requirements for PC Cards vary widely. Some cards drain the battery pack
very rapidly.

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

Minimizing the Energy Required

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

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

● Customize the timeout value to work more efficiently with the applications. The length of battery life

depends on the values selected.

Maximizing the Energy Stored

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

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

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

constant trickle charge.

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

Top of Page

Conditioning a Battery Pack

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

To condition a battery pack, complete the following steps:

1. Plug in the AC adapter and allow the battery to charge until the battery charging status icon turns off. Your

battery gauge may show four bars (and Windows may report 100%) before the battery charging status icon

turns off. Do not unplug the AC adapter until the battery charging status icon disappears.

2. Unplug the AC adapter and allow the battery to drain until the computer reaches hibernation and turns itself

off. Do not plug in the AC adapter during this process or you will need to restart with Step 1. You

may use the computer while the battery is draining.

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

The table below shows the approximate battery pack charge times.

Approximate Battery Charge Time

Computer On Line Off Line

Li ion Battery Pack 4.5 hours 2:50 hrs

Top of Page

Disposing of a Used Battery Pack

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

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

Top of Page

Maintenance & Service Guide

14.1 " TFT

Celeron 400-MHz w/128 Cache

4.8 GB

24x CD-ROM

3.5" Floppy Drive

64 MB

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Models and Features

Models and
Features

Controls and
Lights

Internet
Zone
Buttons and
Lights

Front Bezel
Components

Left Side
Components

Right Side
Components

Bottom of
Unit

Compaq Presario 1800 Series Portable Computer Models

Display
Processor
Hard Drive
CD or DVD Drive
Diskette Drive
Modem
Networking
Battery
System Memory

Display

Model 1825

15.0" TFT
Pentium II/366-MHz w/256 Cache

6.4-GB
4x DVD Drive

3.5" Floppy Drive

56.0 Kbps Data/Fax with PCI
10/100TX Integrated Ethernet
sLi ion
64 MB

Model 1800T CTO (Configure to Order)

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

Processor

Hard Drive

CD or DVD Drive

Diskette Drive

Modem
Networking

System Memory

56.0 Kbps Data/Fax with PCI
10/100TX Integrated Ethernet

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Illustrated Parts Catalog | Removal & Replacement Procedures |

Pin Assignments | Battery Pack Operations

Product Description

Troubleshooting

Specifications

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
Connectors

Power
Management
for Windows
98

Controls
and
Lights

1. Display
Release
Latch

2. Display

3. Power

(On/Off)
Button

4.
Keyboard

5. Touch
Pad

6.

Integrated
Speakers

7. Touch
Pad
Button
(Left)

8. Scroll
Up/Down
Button

9. Touch
Pad
Button
(Right)

10. Model
Number

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin 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 of
Unit

Internet Zone
Buttons and
Lights

1. AC Adapter
Light

2. Cap Lock Light

3. Instant

Internet Access
Button

4. Instant E-Mail
Button

5. My Presario
Instant Access
Button

6. Power Button

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

7. Instant Search

Button

8. Online
Marketplace
Button (US/Puerto
Rico), Instant
Answer Button
(countries outside
the US)

9. Retail Central
Button (US/Puerto
Rico), Instant E­Commerce Button
(countries outside
the US)

10. Num Lock
Light

11. Scroll Lock
Light

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin 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 of
Unit

Back
Connectors

Port
Replicator
Components

Front Bezel
Components

1. Previous
Track Button

2. Next Track
Button

3. Sleep Status
Icon

4. Power Status
Icon

5. Battery
Charging Status
Icon

6. DisqPlay
Status Icon

7. Battery
Gauge

8. DisqPlay
On/Off Button

9. Volume
Down Button

Port
Replicator
Connectors

Power
Management
for Windows
98

10.Volume Up

Button

11. Play/Pause
Button

12. Stop Button

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin 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 of
Unit

Back
Connectors

Port
Replicator
Components

Left Side
Components
with
Diskette
Drive

1. Security Slot

2. CD or DVD

Drive

3. CD or DVD
Drive Eject Button

4. CD or DVD
Drive Manual Eject
Hole

5. Diskette Drive

6. Diskette Drive

Eject Button

Left Side
Components with
LS120 Drive

Port
Replicator
Connectors

Power
Management
for Windows
98

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Product Description

Left Side Components
with LS120 Drive

1. Security Slot

2. CD or DVD Drive

3. CD or DVD Drive Eject

Button

4. CD or DVD Drive Manual
Eject Hole

5. LS120 Drive

6. LS120 Drive Eject

Button

7. LS120 Drive Manual
Eject Hole

Back to Left Side Components with
Diskette Drive

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin 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 of
Unit

Right Side
Components

1. Battery
Compartment

2. PC Card Eject
Button

3. PC Card Slot

4. Headphone

Jack

5. Microphone
Jack

6. Modem Port

7. Ethernet Port

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin 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 of
Unit

Bottom of Unit

1. Stand Feet

2. Serial Number

3. Memory

Compartment Door

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin 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 of
Unit

Back
Connectors

Back
Connectors

1. Keyboard/Mouse
Port

2. AC
Adapter Connector

3. Parallel Port

4. Port Replicator

Connector

5. Fan Vent

6. TV Out Connector

7. External Monitor

Port

8. Serial Port

9. Universal Serial

Bus Port

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin 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 of
Unit

Port
Replicator
Components

1. Port
Replicator
Interface
Connector

2. Port
Replicator Guide
Posts

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin 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 of
Unit

Port
Replicator
Back
Connectors

1. Universal Serial
Bus Port

2. Universal Serial
Bus Port

3. Power (AC
Adapter) Connector

4. Keyboard/Mouse
Port

5. Keyboard/Mouse
Port

6. Parallel Port

Back
Connectors

Port
Replicator
Components

Port
Replicator
Connectors

Power
Management
for Windows
98

7. Game Port

8. Serial Port

9. External Monitor

Port

10. S Video

11. (Composite)

TV Out

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Power Management for Windows 98

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

● Power Management Settings

● Hibernation Mode

● Sleep Mode

● Battery Operating Time

● Rebooting After a Lockup

● Recovering From a Loss of Electrical Power

● Servicing the Computer - Full Off Mode

Power Management Settings

Differing patterns of computer use determine the level 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, 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:

● when the computer goes into Sleep (Standby) mode

● when the screen times out and goes blank

● 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 must
be 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 is
listed below in the tables.

Power Management Properties

Always on Plugged in Running on Batteries
System Standby
Turn OFF Monitor
Turn OFF Hard Disks

Never 5 minutes
15 minutes 2 minutes
1 hour 3 minutes

Portable/Laptop Plugged in Running on Batteries
System Standby
Turn OFF Monitor
Turn OFF Hard Disks

Never 15 minutes
3 hours Never
15 minutes 10 minutes

Home/Office Desk Plugged in Running on Batteries
System Standby
Turn OFF Monitor
Turn OFF Hard Disks

20 minutes 1 minute
15 minutes 2 minutes
30 minutes 10 minutes

CAUTION: The settings on the Alarms tab have been preset for the computer to run at
its best. Changing any of these settings could cause the computer to function improperly.
It is recommended that these settings be left at their default values.

Power Management Properties

Alarms:
Low Battery Alarm: 10%

Critical Battery Alarm 0%
Alarm Actions: Notification: Text

Power Mode: No Action

Compaq Presario 1800 Series Computers have two levels of power management: Hibernation and Sleep.

Hibernation mode occurs by pressing the Power button once. The computer saves the contents of the computer memory
to the hard drive. This is followed by the computer turning off.

Sleep mode is a low-power mode, also referred to as Standby mode. It occurs by pressing the Fn+F4 function key or by
clicking the Start button, then Shutdown, then Standby.

CAUTION: While in Sleep mode, the computer will maintain system information and open
files. Unsaved information will be lost if the computer is turned off prior to system wake­up, or if a power loss occurs while using the AC adapter.

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

Hibernation and Sleep Functions
Mode To Initiate To End Indicators

Manual - Fn+F4 key

Flashing Power light*

combination or click the Start

Sleep

button on the Windows Taskbar,
then point to Shutdown, then
click Standby.

Time-Out Default - 15 minutes

Press any key.

*Moon icon appears on status display
(1800 Series only)

if using battery power.
Computer will not automatically
enter Sleep mode if on AC
power.

Manual - Press Power Button

Power light is off, screen is blank*

once

*Power icon does not appear on status

Hibernate

Press Power

display (1800 Series only)

Button once

Off

Time-Out Default - If your

battery is low or after 1 hour of
Sleep. Computer will not
automatically enter Hibernation
mode if on AC power.

Standard - Perform normal
Windows shutdown using the
Start button on the Windows
Taskbar.

Manual* - Press and hold down
the Power button for 4 seconds.

*The Manual shutdown mode is
not recommended unless the
Standard shutdown mode does
not work.

Press Power
Button once

No Power light (or icon), screen is blank.

Hibernation Mode

Hibernation helps conserve battery life and protect the data. Hibernation can be a routine power-saving event or the result
of a low battery. As the computer enters Hibernation, it automatically saves the content of the computer memory to the
hard drive before it turns off.

The computer will automatically enter Hibernation mode when the battery has little power left or when the computer
(operating on battery power) has been in Sleep mode for more than one hour. Activate Hibernation mode by pressing the
Power button once.

To restart the computer, press the Power button once. When the computer enters or wakes from Hibernation mode, it
displays a Progress window.

Top of Page

Sleep Mode

Selecting Sleep mode instead of turning off the computer when finished allows the computer to wake up faster than turning
it completely off and saves power over the active (On) mode.

Activate Sleep mode by pressing Fn+F4. Or, click Start, select the Shut Down option, and click Standby.

Servicing the Computer - Full Off Mode

The computer must be turned off completely when installing or replacing components in the system. Follow the instructions
above for properly putting the computer into Off mode, unplug from the outlet, and remove the battery

(see battery

section for instruction on removing battery).

Top of Page

Rebooting After a Lockup

To reboot the computer (as if from a cold start), when the keyboard is frozen or the screen is locked, 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 does not recover, press the Power button and hold for four seconds to shut it down, then remove
the battery or unplug the AC power for at least 30 seconds. Reinsert the battery or reconnect AC power and press the
Power button once to reboot.

Top of Page

Recovering From a Loss of Electrical Power

Loss of electrical power will cause the Internet PC to automatically turn off. This may cause loss of data because the
Microsoft Windows operating system is not able to properly close all files and programs.

Loss of power may be caused by one of the following:

● Electrical power service is interrupted.

● The power cord is accidentally disconnected.

If power surges or sags, the display and status lights may flicker, and the computer may automatically restart. If an
improper shutdown occurs, ScanDisk, a Microsoft Windows utility program, will automatically run once power is restored.
ScanDisk will determine if the improper shutdown caused any errors on the hard disk. These errors may occur if the
Microsoft Windows operating system was not able to properly close all files before the shutdown. If no errors are found, the
restart process will continue. If ScanDisk does detect errors, follow the instructions shown to continue the restart process.
Work that was not saved prior to the lockup may be lost.

Use of a surge suppressor, line conditioner, or uninterruptible power supply (UPS) may protect the computer from damage
caused by power surges or sags.

If a power failure occurs or the power cord disconnects while the computer is turned on, turn off the computer until normal
service has been restored. ScanDisk may run to check the hard disk for errors caused by the improper shutdown the next
time the computer turns on.

Top of Page

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

● 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 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Preliminary Steps

Before running POST, complete the following preliminary steps:

1. If a power-on password has been established, type the password and press the

Enter key. If the password is not known, 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:

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.

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.

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

Return to Troubleshooting

POST.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting

Clearing the Power-on Password

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

The RTC battery is located
on the system board directly
forward of the fan.

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

1. Turn off the computer.

2. Disconnect the power cord.

3. Remove the

4. Remove the palmrest cover

with touchpad.

battery pack.

5. Remove the keyboard.

6. Remove the heatspreader.

7. Slide the black switch
toward the front of the
computer to clear CMOS. Hold
the switch in the forward
position for at least 15
seconds to ensure that the
password is cleared. The
switch is located on the back
of the DVD or CD drive in the
middle of the system board.

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.

Return to

Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Power-On Self Test (POST)

Running POST

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 logo
and 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. 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.

NOTE:

Probable Cause Recommended Action

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

Power-On Self-Test Messages

102-System Board Failure

DMA, timers, etc. Replace the system board.

162-System Options Not Set

Probable Cause Recommended Action

Configuration incorrect Run Computer Setup.
CMOS reflects that an invalid

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

Memory test data error 1. Replace the memory modules.

XX000YZZ RAM failure Replace the system board.

Run Computer Setup.

2. Replace the system board.

2. Replace the system board.

XX000YZZ 201-Memory Error

Probable Cause Recommended Action

Probable Cause Recommended Action

Keyboard failure 1. Ensure the keys are not depressed during POST.

304-Keyboard or System Unit Error

Probable Cause Recommended Action

Keyboard or system board error 1. Replace the keyboard.

1. Replace the memory modules.

2 Replace the system board.

301-Keyboard Error

2. Reconnect the keyboard with the computer off.

3. Replace the keyboard.

2. Replace the TouchPad or mouse.

3. Replace the system board.

601-Diskette Controller Error

Probable Cause Recommended Action

Mismatch in drive type or failure in the diskette
controller

605-Diskette Drive Error

Probable Cause Recommended Action

Mismatch in drive type Run Computer Setup.

1780-Primary Hard Drive 0 Failure

Probable Cause Recommended Action

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

1. Run Computer Checkup (TEST).

2. Check and/or replace cables.

3. Replace the system board.

2. Replace the hard drive.

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

2. Replace the hard drive.

1782-Hard Drive Controller

Probable Cause Recommended Action

Hard drive controller failure 1. Run Computer Setup.

2. Replace the hard drive.

Top of Page

Return to Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Compaq Diagnostics

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

The Diagnostics menu includes the following utilities:

■ Computer Checkup (TEST)

■ View System Information (INSPECT)

■ Prepare Computer for a Compaq Service Call (RemotePaq)

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

Computer Checkup (TEST)

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

Follow these steps to run Computer Checkup:

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

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

3. Insert the Compaq Diagnostics diskette in drive A.

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

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

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

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

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

NOTE:

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

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

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

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

■ Automatic Diagnostics. Runs unattended, maximum testing of each device with

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

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

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

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

11. Exit the Test Option menu.

12. Exit the Diagnostics menu.

View System Information (INSPECT)

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

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

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

2. Insert the Compaq Diagnostics diskette in drive A.

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

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

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

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

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

7. Follow the instructions on the screen to cycle through the screens, to return to the list and

choose another item, or to print the information.

Top of Page

Return to Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Contacting Compaq Support

Obtain the following information before contacting Compaq Reseller Support:

● Product name

● Product serial number

● Purchase date

● Conditions under which the problem occurred

● Any error messages that have occurred

● Hardware configuration

● Type of printer connected

● Hardware/software being used

● Printed result of Computer Checkup (TEST)

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

Shipping Preparation

To ship the computer, complete the following steps:

1. Back up the critical hard drive files. Ensure that backup tapes/diskette are not

exposed to electrical or magnetic fields while stored in transit.

2. Turn off the computer and external devices.

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

IMPORTANT:

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

Return to Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

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.

Retest the system after completing each step. If the problem

IMPORTANT:

has been resolved, 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
600 through 699 Diskette or LS120 Drive Test
1101 Serial Test
1701 through 1736 Hard Drive Test
501 through 516 Video Test
2402 through 2456
2458 through 2480
3206 Audio Test
8601 through 8602 TouchPad Pointing Device Test
3301 through 6623 DVD or CD Test

Processor Test Error Codes
Error

Code Description Recommended Action

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

Utilities.

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

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

2. Verify cable connections to speaker.

3. Replace the system board and retest.

Memory Test Error Codes

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

Keyboard Test Error Codes

300-xx Failed ID Test 1. Check the keyboard connection. If
301-xx Failed Self-test/Interface Test
302-xx Failed Individual Key Test
304-xx Failed Keyboard Repeat Test

2. Replace the system board and retest.

2. Install a new memory module and
retest.

disconnected, turn off the computer and
connect the keyboard.

2. Replace the keyboard 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

403-xx Printer pattern test failed

Diskette or LS 120 Drive Test

600-xx
601-xx Diskette or LS120 format failed

602-xx Diskette or LS 120 read test failed
603-xx

604-xx
605-xx Diskette or LS120 ID media failed

Diskette or LS120 ID drive types test

failed

Diskette or LS120 write, read,

compare test failed

Diskette or LS120 random read test

failed

3. Install the loop-back connector and
retest.

4. Check port and IRQ configuration.

5. Replace the system board and retest.

1. Replace the diskette media and retest.

2. Check and/or replace the diskette power
and signal cables and retest.

3. Replace the diskette or LS120 drive and
retest.

4. Replace the system board and retest.

606-xx Diskette or LS120 speed test failed
609-xx

610-xx
697-xx Diskette or LS120 type error
698-xx

699-xx

1101-xx

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

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

Diskette or LS120 reset controller test

failed

Diskette or LS120 change line test

failed

Diskette or LS120 drive speed not

within limits

Diskette or LS120 drive/media ID

error

Serial Test Error Codes

Serial port test failed 1. Check port configuration

Hard Drive Test Error Codes

Hard drive write/read/compare test

failed

1. Replace media.

2. Run the Configuration and Diagnostics
Utilities.

2. Replace the system board and retest.

Utilities and verify drive type.

2. Verify that all secondary drives have
secondary drive capability.

3. Replace the hard drive and retest.

4. Replace the system board and retest.

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

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

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

Hard drive conditional format test

failed

Video Test Error Codes

501-xx Video controller test failed The following steps
502-xx Video memory test failed
503-xx Video attribute test failed
504-xx Video character set test failed

505-xx

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

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

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

apply to error codes 501-xx through 516­xx:

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

2. Replace the display assembly and retest.

3. Replace the system board and retest.

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

2405-xx

2406-xx

2408-xx

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

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

2402-xx through 2456-xx:

1. Run the Configuration and Diagnostics
Utilities.

2. Replace the display assembly and retest.

3. Replace the system board and retest.

2414-xx Video white screen test failed

2416-xx Video noise pattern test failed

2418-xx ECG/VGC memory test failed

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

Utilities.

2421-xx ECG/VGC 640 x 200 graphics mode

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

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

failed
2424-xx ECG/VGC monochrome text mode test

failed

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

3. Replace the display assembly and retest.

4. Replace the system board and retest.

2425-xx ECG/VGC monochrome graphics mode

test failed
2431-xx 640 x 480 graphics test failure

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

test failure
2448-xx Advanced VGA Controller test failed

2451-xx 132-column Advanced VGA test failed

2456-xx Advanced VGA 256 Color

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

2458-xx through 2480-xx:

2468-xx Advanced VGA DAC test

Replace the system board and retest.

2477-xx Advanced VGA data path test

2478-xx Advanced VGA BitBLT test

2480-xx Advanced VGA LineDraw test

Audio Test Error Codes

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

TouchPad/Pointing Device Interface Test Error Codes

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

2. Replace the system board and retest.

8602-xx Interface test failed

DVD or CD Drive Test Error Codes

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

2. Verify that the speakers are connected.

3305-xx DVD or CD drive seek test failed

6600-xx ID test failed

6605-xx Read test failed

6608-xx Controller test failed

6623-xx Random read test failed

3. Verify that drivers are loaded and
properly installed.

4. Replace the DVD or CD drive and retest.

5. Replace the system board and retest.

Top of Page

Return to Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Troubleshooting Without Diagnostics

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

Audio 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 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.

Top of Page

Return to Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Solving Minor Problems

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

Solving Audio Problems

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

Solving Audio Problems

Problem Probable Cause Solution(s)

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

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

No action is required.

Solving Battery Pack and Battery Gauge Problems

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

Solving Battery Pack and Battery Gauge Problems

Problem Probable Cause Solution(s)

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

Computer is beeping and battery icon is
blinking.

Battery pack is discharged. Connect the computer to an external

power source and charge the battery
pack.

Replace the battery pack with a fully
charged battery pack.

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

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

do any one of the following:

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

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

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

Volume is turned down too low. Adjust the volume.

Battery pack is already charged. No action is necessary.
Battery pack was exposed to

temperature extremes.
Battery pack is at end of its life. Replace battery pack.
RTC battery is dead. Replace the RTC battery.

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

Top of Page

Problem Probable Cause Solution(s)

Battery charge does not last as long
as expected.

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

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
the battery.

Normal warming has occurred due to
charging.

Power management is turned off or
disabled.

An external device or PC Card is draining
the battery.

Battery pack has partially self­discharged.

Turn off or disconnect external devices
when not using them.

No action is required.

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

Turn off or disconnect external devices
when not using them.

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

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

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

Top of Page

Solving DVD or CD Drive Problems

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.

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

Solving DVD or CD Drive Problems

Problem Probable Cause Solution(s)

DVD or CD drive cannot read a compact
disc.

Disc is upside down or is improperly
inserted in the DVD or CD drive.

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

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

Remove the CD.

Top of Page

Solving Diskette or LS120 Drive Problems

Some common causes and solutions for diskette and LS120 drive problems are listed in the
following table.

Solving Diskette and Diskette Drive Problems

Problem Probable Cause Solution(s)

Diskette or LS120 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-

Computer is writing to
the wrong drive.

Not enough space is left

protected.
Check the drive letter in the

path statement.
Use another diskette.

on the diskette.
Drive error has occurred. Run Computer Checkup from

the Compaq Diagnostics
diskette.

Diskette is not formatted. Format the diskette. At

the system prompt, enter

Diskette or LS120 drive cannot
read a diskette.

Cannot boot from diskette.

FORMAT A:

The wrong type of diskette is
being used.

Use the type of diskette
required by the drive.

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

another diskette. Reformat bad
floppy.

Drive error has occurred. Run Computer Checkup from

the Compaq Diagnostics
diskette.

Diskette is not
formatted.

Format the diskette. At the
system prompt, enter

FORMAT A:

Bootable diskette is not in
drive A.

Put the bootable diskette in
drive A.

Diskette Boot has incorrect
setting in Computer Setup.

Run Computer Setup and set
diskette as first to boot.

Top of Page

Solving Display Problems

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

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

1. Turn off the monitor.

2. Turn off the computer.

3. Disconnect the monitor signal cable from the computer.

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

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

Solving Display Problems

Problem Probable Cause Solution(s)

Screen is dim.

Control for brightness Adjust the Brightness of the

display by using Fn + F7 (¯ )
or

Screen is blank.

Display is blank and the Suspend
icon is flashing.

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

Top of Page

Fn + F8 (- ).

Computer screen is in direct

Tilt display or move computer.

light.
Screen save was initiated by

Power Management due to

Press any key or touch the
Touch Pad.

lack of user activity.
Display has overheated. If computer is in direct sunlight,

move it and allow it to cool off.

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

TouchPad.

Display function was switched
to the external monitor.

Use Fn + F3 to switch between

LCD or CRT.

Problem Probable Cause Solution(s)

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

Using 1024 × 768 or
higher resolution on
external monitor and

Restart the computer.

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

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

Improper backlight or display
cable connections

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

Replace the display assembly.

Defective system board. Replace the system board.

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

Backlight (brightness) cannot be adjusted with

Fn + F7 (¯ ) or
Fn + F8 (- ).***

** 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 icons to turn on at the front of the computer.

Defective system board. Replace the system board.

Improper display cable
connections.

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

1. Reseat the display cable to the
system board.

2. Replace the display assembly.

Problem Probable Cause Solution(s)

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

Improper display cable
connections

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

1. System board

2. Display assembly

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

Top of Page

Defective display cable. Replace the display assembly.

Defective inverter board. Replace the display assembly.

Defective system board. Replace the system board.

Defective display panel. Replace the display assembly.

To perform a "self-test" on an external VGA color or monochrome monitor, complete the
following steps: The screen should be white. A narrow black border may also appear on

NOTE:

the left and right sides of the display. Either of these displays indicates that the monitor is
working properly.

Solving Hard Drive Problems

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

CAUTION: To prevent loss of information, always maintain an up-to-date backup of
your hard drive at all times, in case of errors or failures.

Solving Hard Drive Problems

Problem Probable Cause Solution(s)

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

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

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

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

failed.

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

Run Computer Checkup.

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

Solving Hardware Installation Problems

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

Solving Hardware Installation Problems

Problem Probable Cause Solutions(s)

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

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

Power switch of new external
device is not turned on.

Ensure that all cables are
properly and securely
connected.

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

Device is not seated properly. Turn off the computer and

reinsert the device.

Top of Page

Solving Keyboard/Numeric Keypad Problems

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

Solving Keyboard/Numeric Keypad Problems

Problem Probable Cause Solution(s)

Embedded numeric keypad on
computer keyboard is disabled.

Embedded numeric keypad is
disabled and Num Lock function is

Num Lock function is not
enabled.

External numeric keypad is
connected to the computer.

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

Disconnect the external
numeric keypad from the

on.

computer.

Top of Page

Solving Memory Problems

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

Solving Memory Problems

Problem Probable Cause Solution(s)

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

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

Ensure that the optional
memory expansion card is
installed correctly.

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

Top of Page

Solving Minor Problems continued

System ran out of
memory for the application.

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

Check the application
documentation for memory
requirements.

Install additional memory.

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

Return to Troubleshooting

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Solving PC Card Problems

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

Solving PC Card Problems

Problem Probable Cause Solution(s)

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

Card is not inserted properly.

PC Card beeps are disabled.

Speaker is turned off or volume is
turned down.

PC Card drivers are not installed. Double click the Add New

Ensure that the card is inserted in
the correct orientation.

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

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

Hardware icon in the Control Panel
for installation instructions.

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

PC Card modem or fax card does

Card or card driver is not
supported.

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

Telephone cord is not plugged in
all the way.

Necessary drivers are not
installed (turned on).

You are trying to access the card

If PC Card or drivers are not
compatible with Windows, install
drivers and use the PC Card in MS­DOS 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.

Check and secure telephone
connection.

Install drivers.

See

Specifications to verify COM

not work.

Modem network PC Card does not
work.

Memory or storage card does
not work.

using the wrong COM port.
The card conflicts with a serial

device.
The card is not supported. Use supported cards only.

Network driver is not installed or
is not set up properly.

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

port.
See

Install driver.

Verify telephone connection.

Install driver.

Specifications to verify address.

Top of Page

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. Contact your Compaq authorized

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

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

Solving Power Problems

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

Solving Power Problems

Problem Probable Cause Solution(s)

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

Computer is not connected to a
power source.

Power cords to the external
power source are unplugged.

Insert battery or connect an
external power source.

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

Power adapter is defective. Replace AC Adapter and restart.

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

Top of Page

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

to a critical low-battery
condition.

System initiated Hibernation
after a preset timeout.

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 Probable Cause Solution(s)

Printer will not turn on. The signal cable may not be

connected properly, or the printer
is unplugged.

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

offline.

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
online.

The device drivers for your
application are not installed.

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

Printer cable is too long,
unshielded, or defective.

Paper tray is empty. Fill the paper tray with paper and

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

Connect the printer to the network.

Replace the cable.

set the printer to online.

Printer prints garbled information. Correct printer drivers are not

installed.

Cable is not connected properly. Ensure that the printer signal cable

Top of Page

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

is properly connected to the
computer.

Solving TouchPad/Pointing Device Problems

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

Solving Touch Pad/Pointing Device Problems

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

installed.

The device driver is not installed
in Windows.

External mouse does not work. Mouse is not securely connected

or is connected to an incorrect
external connector.

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

Mouse is not enabled. Enter MOUSE at the system prompt

Install the device driver and add to
the AUTOEXEC.BAT file or
CONFIG.SYS file.

Install the TouchPad/mouse driver in
Windows.

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

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

Cursor skips or moves abnormally
when using the TouchPad.

Top of Page

turned on or restarted.

Cable not properly seated in
TouchPad board.

Defective TouchPad board. Replace TouchPad board.
Defective system board. Replace system board.
Device driver is not correctly

installed in Windows.
The TouchPad needs to be

cleaned.

Reseat cable.

Install the appropriate device driver
in Windows.

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

Return to Solving Minor Problems

Return to Troubleshooting

Maintenance & Service Guide

US 138180-001

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

Presario 1800 Series

Models: 1825 and 1800T

System Unit

Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit
Miscellaneous

Hardware Kit
Miscellaneous

Plastics Kit
Miscellaneous

Parts
Documentation

and Software

System Unit

Description

1. Keyboards

2. Palmrest

Cover
w/TouchPad and
Button Board

3. Upper CPU
Cover w/Power
Switch

4. Speaker
Assembly
w/Cables

Spare Part
Number

138181-001

138183-001

138185-001

5. Enclosure
Base

6. Battery Pack
Li ion Enhanced

LS120 Enclosure
Base (not
shown)

Button Board
Cover (not
shown)

138182-001

138184-001

143925-001

143926-001

Maintenance & Service Guide

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

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

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

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

Presario 1800 Series

System Unit

Boards

Display
Assembly

Mass Storage
Devices

Miscellaneous
Cable Kit

Miscellaneous
Hardware Kit

Miscellaneous
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Boards

Description Part

Number

1. Heatspreader 159698-

001

2. Battery Charger Board 138177-
001

3. Modem

4. Processors

5. System Board 158804-

001

6. Fan Assembly

7. Ethernet Card PCI

8. Memory

9. Internet Button Board

10. LCD Indicator

Module

138162­001

138164­001

138186­001

138187­001

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit

Boards
Display

Assembly

Mass Storage
Devices

Miscellaneous
Cable Kit

Miscellaneous
Hardware Kit

Miscellaneous
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Display Assembly

Spare

Description

1. Display

14.1"
TFT/LVDS

2. Display

15.0"
TFT/LVDS

Part
Number

138175­001

138176­001

Maintenance & Service Guide

6.4-GB Hard Drive 138179-001

1.44-MB Diskette Drive 138188-001

4X 2C DVD Drive 138178-001

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly

Mass Storage
Devices

Miscellaneous
Cable Kit

Miscellaneous
Hardware Kit

Miscellaneous
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Mass Storage Devices

Description

2. Diskette Drives

3. CD/DVD Drives

Spare Part
Number

6X DVD Drive (not
shown)

4.8-GB Hard Drive
(not shown)

24X 2C CD-ROM
Drive (not shown)

LS-120 Drive (not
shown)

158165-001

149371-001

143922-001

143927-001

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices

Miscellaneous
Cables Kit

Miscellaneous
Hardware Kit

Miscellaneous
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Miscellaneous Cables Kit

Miscellaneous Cables Kit

Spare Part Number: 138189-001

Description Quantity

1. Hard Drive Cable

2. CD/DVD Drive Cable

3. Diskette Drive Cable

4. Status Panel Cable

5. LS120/CD-ROM(DVD)

Cable
Modem Cable (not shown)

Touch Pad Cable (not shown) 1 each

Network Interface Card Cable

1 each
1 each
1 each
1 each
1 each

1 each

1 each

(not shown)

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit

Miscellaneous
Hardware Kit

Miscellaneous
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Miscellaneous
Hardware Kit

Miscellaneous

Hardware Kit

Spare Part

Number: 138160-

001

Description Quantity

1. Hard Drive

Mounting
Bracket (right)

2.Hard Drive
Mounting
Bracket (left)

3.Reinforcement
Bracket

1 each

1 each

1 each

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit
Miscellaneous

Hardware Kit

Miscellaneous
Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Miscellaneous
Plastics Kit

Miscellaneous

Plastics Kit

Spare Part

Number:

138190-001

Description Quantity

1. Door,

Battery Pack

2. Cover,

Memory
Module

3. Door,

PCMCIA

4. Display

Hinge
Cover,
(Right)

1 each

1 each

1 each

1 each

5. Display

Hinge
Cover,
(Left)

6. CD

Drive
Guide

7. Latch,

(Right)

8. Latch,

(Left)

9. Stand-

foot

10.

Rubber
Foot

1 each

1 each

10 each

10 each

10 each

10 each

11.

Rubber
Plug (Side
Mount)

12.

Rubber
Plug, LCD

13.

Cover,
LCD FPC

10 each

10 each

1 each

Maintenance & Service Guide

Miscellaneous Screw Kit (not shown) 138161-001

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit
Miscellaneous

Hardware Kit
Miscellaneous

Plastics Kit

Miscellaneous
Parts

Documentation
and Software

Use the scroll down menu for the description
and spare part number of spare parts Not

Shown.

Miscellaneous Parts

Spare

Description

1. A

C Adapter

2. Port
Replicator

Part
Number

298239-001
138167-001

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Illustrated Parts Catalog

System Unit
Boards
Display

Assembly
Mass Storage

Devices
Miscellaneous

Cable Kit
Miscellaneous

Hardware Kit
Miscellaneous

Plastics Kit
Miscellaneous

Parts

Documentation
and Software

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 desired
month. If you do not specify the 3-digit suffix, the default is the
current month in which the order is placed.

QuickFind Part 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

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Electrostatic Discharge

A sudden discharge of static electricity from a finger or other conductor can
destroy static-sensitive devices or microcircuitry. Often the spark is neither
felt nor heard, but damage occurs. An electronic device exposed to
electrostatic discharge (ESD) may not seem to be affected at all and will work
perfectly throughout a normal cycle. Although, it may function normally for a
while, 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 parameters
or melt silicon junctions.

Generating Static

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

Typical Electrostatic Voltages

Event 10% 40% 55%

Walking across carpet 35,000 V 15,000 V 7,500 V
Walking across vinyl floor 12,000 V 5,000 V 3,000 V
Motions of bench worker 6,000 V 800 V 400 V
Removing DIPS from plastic tubes 2,000 V 700 V 400 V
Removing DIPS from vinyl trays 11,500 V 4,000 V 2,000 V
Removing DIPS from Styrofoam 14,500 V 5,000 V 3,500 V
Removing bubble pack from PCBs 26,000 V 20,000 V 7,000 V
Packing PCBs in foam-lined box 21,000 V 11,000 V 5,000 V
NOTE: 700 volts can degrade a

product.

Relative Humidity

Return to Removal & Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Service Considerations

Listed below are some of the considerations that you should keep in mind during the disassembly
and assembly of the computer.

Tool and Software Requirements

To service the computer, you need the following:

● Torx T-8 or T-9 screwdriver

● 5mm nut drivers (for screwlocks and standoffs)

● Small standard screwdriver

● Small Phillips screwdriver

● Diagnostics software

Screws

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

IMPORTANT:

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

Return to Removal & Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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. Handle
cables by the connector whenever possible. In all cases, avoid bending, twisting, or tearing the cables, and ensure
that the cables are routed in such a way that they cannot be caught or snagged by parts being removed or replaced.

Cables

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

● Always handle cables by their connectors.

● Avoid bending, twisting, or pulling on the cables.

● Apply minimum required force when seating or unseating the cables from their connectors.

● Place the cables in such a manner that they cannot be caught or snagged by parts being removed

or replaced.

● Handle flex cables with extreme care; they can tear easily.

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

Select the desired illustration.

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.

The ribbon cable position for the LS120 drive.

The cable position for the speaker assembly.

The cable position for the modem.

The cable position for the Network Interface Card.

The ribbon cable position for the keyboard.

Plastic Parts

Plastic parts can be damaged by the use of excessive force during disassembly and reassembly. When handling the
plastic parts, use care. Apply pressure only at the points designated in the maintenance instructions.

Return to Removal & Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

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

CAUTION: A ZIF connector and
its attached cable can be easily
damaged. Handle only the
connector slide when removing
or replacing a cable. Never pull
or twist on the cable while it is
connected.

CAUTION: When servicing this
computer, ensure that cables
are placed in their proper
location during the reassembly
process. Improper cable
placement can damage the
computer.

Back to

Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The ribbon cable position for the hard drive.

Back to

Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The ribbon cable position for the DVD or CD drive.

Back to Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The ribbon cable position for the diskette drive.

Back to Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The ribbon cable position for the LS120 drive.

Back to Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The cable position for the speaker assembly is shown below. The cable is routed under the
battery charger board and under the edge of the system board.

Back to Cables and Connectors.

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

The cable position for the modem.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

Pin Assignments | Battery Pack Operations

Back to Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The cable position for the Network Interface Card.

Back to Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

The ribbon cable position for the keyboard.

I

Back to Cables and Connectors.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Preparing the Computer for Disassembly

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Before beginning
steps:

1. Disconnect AC power and any external devices.

2.

3. Remove any PC Cards.

4.

Remove the battery pack.

Remove the Port Replicator.

Removal & Replacement Procedures, complete the following

IMPORTANT:

The battery pack should be removed before performing any
internal maintenance on the computer.

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly

NOTE:

WARNING: Metal objects can damage the battery pack as well as

the 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
Portable Computers into the battery compartment. Do not force the
battery pack into the bay if insertion does not occur easily.

CAUTION: Do not crush, puncture, or incinerate the battery pack.
Do not open a battery pack, as this damages the pack, makes it
unusable, and exposes potentially harmful battery components.
There are no field-serviceable parts located inside the battery pack.

The Compaq Presario 1800 Series Portable Computers have several
screws of various sizes which are not interchangeable. Care must be
taken during reassembly to ensure that the correct screws are used
in their correct location. During removal please keep respective
screws with their associated sub-assembly.

Upper CPU
Cover

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack

Palmrest
Cover with
Touch Pad

Keyboard
Status Panel
Internet

Button Board

Removing
the
Battery
Pack

To remove the
battery pack,
complete the
following steps:

1. Slide the
battery pack
compartment
door down and
remove it from
the chassis.

2. Pull the
battery pack
from the chassis
by the tab
located on the
end of the
battery pack.

Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly

To replace the
battery pack,
reverse the
previous
procedures.

Return to
Removal &
Replacement
Procedures

Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack

Palmrest
Cover with
TouchPad

Keyboard
Status Panel

Removing the
Palmrest
Cover with
TouchPad

It is not
necessary
to remove
the display
panel

NOTE:

To remove the
palmrest cover with
touchpad, complete
the following steps:

assembly to
access the
interior
components
of the
computer.

Internet
Button Board

Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover

1.

Prepare the
computer for
disassembly.

2. Close the display
assembly and turn
the computer upside
down.

3. Remove five
screws from the
bottom of the
computer.

Next Step

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
Palmrest Cover with
TouchPad, continued

4. Turn the computer right
side up.

5. Pull the display release
latches and open the display
assembly.

6. Lift up the front end of the
palmrest cover with touchpad
and remove it from the
groove in the chassis.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the Palmrest Cover with
TouchPad, continued

7. Disconnect the flex cable from the LIF connector
on the DisqPlay Module.

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

CAUTION:When replacing the palmrest
cover with touch pad, ensure that the
flex cable is fully inserted into the LIF
connectors on both ends. If the metal
ends should come in contact with the
keyboard, damage may occur to the
computer.

Return to Removal & Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard

Status Panel
Internet

Button Board
Heatspreader

Removing
the
Keyboard

To remove the
keyboard, complete
the following steps:

1.

Prepare the
computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Gently lift up the
front of the
keyboard and
disconnect the flex
cable from the ZIF
connector on the
system board and
remove the
keyboard.

Network
Interface Card

Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive

When
replacing
the
keyboard,
the

keyboard

NOTE:

To replace the
keyboard, reverse
the previous
procedures.

cable should

fold behind
the ZIF
connector
rather than
underneath
the
keyboard.

Battery
Charger Board

Speaker
Assembly

System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard

Removing
the Status
Panel
Assembly

Illustrations
may show
parts
removed
that are not
part of this
procedure.

NOTE:

It is
necessary
to remove
only the
parts listed
in the
written
procedure.

Status Panel

Internet
Button Board

Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly

To remove the
status panel
assembly, complete
the following steps:

1.

Prepare the
computer for
disassembly.

2. Open the display
assembly and
squeeze the sides of
the display
assembly hinge
covers while sliding
them off the hinges.

Next Step

Upper CPU
Cover

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
Status Panel
Assembly,
continued

3. Remove two innermost
screws from the display
assembly hinges which secure
the status panel to the
chassis.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the Status
Panel Assembly,
continued

4. Turn the unit upside down and
remove two screws located in the back
that secure the status panel assembly
to the chassis.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
Status Panel
Assembly,
continued

5. Turn the unit right side up
and open the display
assembly.

6. Lift up one corner of the
status panel assembly,

push forward from the back
(center piece) to release the
snaps on the status panel

assembly and remove
from the chassis.

To replace the status panel
assembly, reverse the
previous procedures.

Return to Removal &
Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard

Removing the
Internet Button
Board

Illustrations
may show
parts
removed
that are not
part of this
procedure.

NOTE:

It is
necessary
to remove
only the
parts listed
in the
written

Status Panel

Internet
Button Board

Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly

procedures.

To remove the
Internet Button
board, complete
the following
steps:

Prepare the

1.

computer for
disassembly.

2. Remove the

status panel.

3. Remove screw

Upper CPU
Cover

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

securing the
display flex cable
bracket and
disconnect the
display flex cable
and backlight
cable from the
Internet Button
Board.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
Internet Button
Board, continued

4. Remove two screws
securing the Internet Button
Board and remove from the
chassis.

To replace the Internet Button
Board, reverse the previous
procedures.

Return to Removal &
Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard
Status Panel
Internet

Button Board

Removing the
Heatspreader

To remove the heatspreader,
complete the following steps:

1.

Prepare the computer for

disassembly.

2. Remove the palmrest

cover with touch pad.

3. Remove the keyboard.

4. Remove four screws from
the heatspreader and lift out
of the chassis.

If the thermal pads
on the heatspreader

NOTE:

are missing or
damaged, a new
heatspreader should
be installed.

Heatspreader

Network
Interface Card

Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive

Before
installing the
new
heatspreader,

IMPORTANT:

To replace the heatspeader,
reverse the previous
procedures.

WARNING: To
prevent damage, do
not use excessive
force when
replacing the
screws.

remove the
plastic
covering from
the thermal
pads.

Battery
Charger Board

Speaker
Assembly

System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard
Status Panel

Removing
the
Network
Interface
Card

To remove the
Network
Interface Card
(NIC), complete
the following
steps:

1.

Prepare the
computer for
disassembly.

2. Remove the

palmrest cover
with touchpad.

Internet
Button Board

Heatspreader

Network
Interface Card

Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive
Battery

Charger Board

3. Remove the

keyboard.

4. Remove the

heatspreader.

5. Remove two
screws from the
Network
Interface Card,
lift the Network
Interface Card
off the system
board and
disconnect the
cable from the
Network
Interface Card.

To replace the
Network
Interface Card,
reverse the
previous
procedures.

Speaker
Assembly

System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
TouchPad

Keyboard

Removing
the Modem

To remove the
modem, complete
the following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover with
touchpad.

3. Remove the

keyboard.

4. Remove the

status panel.

Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card

Modem

Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover

5. Remove the

heatspreader.

6. Remove the

Network Interface
Card.

7. Remove three
screws from the
modem board, lift
the modem board
off the connector on
the system board,
and disconnect the
modem cable from
the modem board.

To replace the
modem board,
reverse the previous
procedures.

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Return to Removal
& Replacement
Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Removing
the Hard
Drive

Illustrations
may show
parts
removed
that are not
part of this
procedure.

NOTE:

It is
necessary
to remove
only the
parts listed
in the
written
procedure.

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem

Hard Drive

DisqPlay
Module

Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover

To remove the hard
drive, complete the
following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover with
touchpad.

3. Remove three
screws from the
hard drive mounting
bracket, disconnect
the hard drive data
cable and lift out the
hard drive with
drive mounting
bracket attached.

Next Step

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
Hard Drive
Mounting
Brackets,
continued

To remove the hard drive
mounting brackets, complete
the following step:

1. Remove two screws from
each of the hard drive
mounting brackets.

To replace the hard drive and
hard drive mounting brackets,
reverse the previous
procedures.

Return to Removal &
Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard

Removing
the
DisqPlay
Module

Illustrations
may show
parts
removed
that are not
part of this
procedure.

NOTE:

It is
necessary
to remove
only the
parts listed
in the
written
procedure.

Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive

DisqPlay
Module

Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive

To remove the
DisqPlay Module,
complete the
following steps:

1.

Prepare the
computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Remove the hard

drive.

4. Lift up the
DisqPlay Module,
disconnect the flex
cable from the
DisqPlay Module,
and remove the
DisqPlay Module
from the chassis.

Battery
Charger Board

Speaker
Assembly

System Board
Memory

Module

To replace the
DisqPlay Module,
reverse the
previous
procedures.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Removing
the
Processor

To remove the
processor, complete
the following steps:

1.

Prepare the
computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Remove the

keyboard.

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module

Processor

DVD or
CD Drive

Display Panel
Assembly

4. Remove the

heatspreader.

5. Remove screw,
lift the processor up
off the connector on
the system board,
and slide the
processor from
under the upper
CPU cover to
remove from the
chassis.

Next Step

Upper CPU
Cover

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Replacing the Processor

To replace the processor complete the following steps:

IMPORTANT:

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

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

2. Replace the screw.

Return to Removal & Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard

Removing
the DVD or
CD Drive

To remove the DVD
or CD drive,
complete the
following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Remove the

keyboard.

Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor

DVD or
CD Drive

Display Panel
Assembly

4. Remove the

heatspreader.

5. Turn the unit
over and remove
two screws from the
base enclosure
which secure the
DVD or CD drive to
the chassis.

Next Step

Upper CPU
Cover

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
DVD or CD Drive,
continued

6. Turn the unit over and
remove two screws located at
the back of the DVD or CD
drive.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
DVD or CD Drive,
continued

7. Disconnect the DVD or CD
drive cable from the DVD or
CD drive and push forward
from the back of the DVD or
CD drive to remove from the
chassis.

To replace the DVD or CD
drive, reverse the previous
procedures.

Return to Removal &
Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
TouchPad

Keyboard

Removing
the Display
Panel
Assembly

Illustrations
may show
parts
removed
that are not
part of this
procedure.

NOTE:

It is
necessary
to remove
only the
parts listed
in the
written
procedures.

Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive

Display Panel
Assembly

Upper CPU
Cover

To remove the
display panel
assembly, complete
the following steps:

1.

Prepare the
computer for
disassembly.

2. Remove the

status panel
assembly.

3. Remove screw
securing the display
flex cable bracket
and disconnect the
display flex cable
and backlight cable
from the Internet
Button Board.

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the Display
Panel Assembly,
continued

4. Remove two outermost screws from
the display base hinges.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing
the Display
Panel
Assembly,
continued

5. Remove the
display assembly
from the chassis.

To replace the
display panel
assembly, reverse
the previous
procedures.

Return to Removal
& Replacement
Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

the Upper
CPU Cover

To remove the
upper CPU cover,
complete the
following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Remove the

keyboard.

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly

Upper CPU
Cover

4. Remove the

heatspreader.

5. Remove the

status panel
assembly.

6. Remove the

Internet Button
board.

7. Remove the hard

drive.

8. Remove the

display panel
assembly.

9. Remove four
screws located on
the top of the upper
CPU cover.

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board
Memory

Module

10. Lift the upper
CPU cover off the
chassis.

To replace the upper
CPU cover, reverse
the previous
procedures.

Return to Removal
& Replacement
Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Removing
the Fan
Assembly

To remove the fan
assembly, complete
the following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Remove the

keyboard.

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover

Fan Assembly

Diskette Drive
Battery

Charger Board
Speaker

Assembly
System Board

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. Lift the fan
assembly from the
chassis slot and
disconnect the fan
cable from the
connector on the
system board.

Next Step

Memory
Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the Fan
Assembly,
continued

To remove the fan gasket,
complete the following step:

Pull the gasket from the fan.
To replace the fan assembly

and gasket, reverse the
previous procedures.

When
replacing the
fan assembly
ensure the
arrow

IMPORTANT:

(located on
the side of
the fan near
the
connector) is
pointing
inward.

Return to Removal &
Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with

Removing
the
Diskette
or LS120
Drive

To remove the
diskette or
LS120 drive,
complete the
following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover
with touch pad.

Touch Pad
Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module

3. Remove the

keyboard.

4. Remove the

heatspreader.

5. Remove the

DVD or CD
Drive.

6. Remove the

status panel
assembly.

7. Remove the

Internet Button
board.

Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly

Diskette Drive

Battery
Charger Board

Speaker
Assembly

System Board

8. Remove the

display panel
assembly.

9. Remove the

hard drive.

10. Remove the

upper CPU
cover.

11. Remove
screw from the
diskette or
LS120 drive
retaining
bracket.

Next Step

Memory
Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the Diskette or LS120
Drive, continued

12. Remove the screw that connects the diskette or
LS120 drive bracket to the chassis.

13. If you have a diskette drive, then disconnect the
diskette drive data cable from the ZIF connector on the
system board and lift the diskette drive from the
chassis.

If you have a LS 120 drive, then disconnect the

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

LS120 drive from the chassis.

CAUTION: Ensure that cables are placed in
their proper location during the reassembly
process.

LS120

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

Return to Removal & Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard
Status Panel

Removing
the Battery
Charger
Board

To remove the
battery charger
board, complete the
following steps:

1. Prepare the

computer for
disassembly.

2. Remove the

palmrest cover with
touch pad.

3. Remove the

keyboard.

Internet
Button Board

Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly

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.

Diskette Drive

Battery
Charger Board

Speaker
Assembly

System Board
Memory

Module

10. Remove two
screws from the
battery charger
board, unplug the
board from the
connector on the
system board, and
lift out of the
chassis.

When
replacing
the battery
charger
board,
ensure that

NOTE:

the pins are
aligned with
the
connector
on the
system
board.

To replace the
battery charger
board, reverse the
previous
procedures.

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Removing the
Speaker Assembly

To remove the speaker assembly,
complete the following steps:

1. Prepare the

disassembly.

2. Remove the palmrest cover

with touch pad.

3. Remove the keyboard.

4. Remove the heatspreader.

5. Remove the status panel

assembly.

computer for

Cover with
Touch Pad

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module

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 cables
from the system board and
remove the speaker assembly
from the chassis.

Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive
Battery

Charger Board

Speaker
Assembly

CAUTION: Ensure that

cables are placed in their
proper location during the
reassembly process.

To replace the speaker assembly,
reverse the previous procedures.

System Board
Memory

Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Removing the System Board

To remove the system board, complete the following steps:

1. Prepare the

2. Remove the palmrest cover with touchpad.

3. Remove the keyboard.

4. Remove the heatspreader.

5. Remove the status panel assembly.

6. Remove the Internet Button board.

7. Remove the display panel assembly.

computer for disassembly.

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive
DisqPlay

Module
Processor
DVD or

CD Drive
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.

12. Remove the modem.

13. Remove the Network Interface Card.

14. Remove the DVD or CD drive.

15. Remove the fan assembly.

16. Disconnect the diskette or LS120 drive cable from the system board.

Upper CPU
Cover

Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly

System Board

Memory
Module

17. Remove the battery charger board.

18. Disconnect the speaker assembly cables.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing
the System
Board,
continued

19. Remove ten
standoffs from the
system board.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing
the System
Board,
continued

20. Remove two
screws from the DVD
or CD drive mounting
rail and remove the
mounting rail from
the system board.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
System Board,
continued

21. Remove four screws from
the system board.

Next Step

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

| Home Page | Notice | Preface | Product Description |

Troubleshooting

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the
System Board,
continued

22. Lift up the front and pull
forward to remove the system
board from the chassis.

Before
replacing the

IMPORTANT:

To replace the system board,
reverse the previous
procedures.

system board,
remove all
remaining
cables.

Return to Removal &
Replacement Procedures

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removal
Sequence

Electrostatic
Discharge

Service
Considerations

Cables and
Connectors

Preparing the
Computer for
Disassembly

Battery Pack
Palmrest

Cover with
Touch Pad

Keyboard
Status Panel
Internet

Button Board
Heatspreader
Network

Interface Card
Modem
Hard Drive

Removing
the Memory
Module

To remove the
memory
module,
complete the
following
steps:

1. Prepare the

computer for
disassembly.

2. Close the
computer and
turn it upside
down.

3. Remove the
screw from the
memory
module door.

4. With the
front of the
computer
facing you,
slide the
memory
module door
to the left.

DisqPlay
Module

Processor
DVD or

CD Drive
Display Panel

Assembly
Upper CPU

Cover
Fan Assembly
Diskette Drive
Battery

Charger Board
Speaker

Assembly

Next Step

System Board

Memory
Module

Maintenance & Service Guide

Presario 1800 Series

Models: 1825 and 1800T

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

Illustrated Parts Catalog | Removal & Replacement Procedures |

Specifications

Pin Assignments | Battery Pack Operations

Removal & Replacement Procedures

Removing the Memory Module,
continued

5. Pull side levers to release the
memory module and unplug the
memory module from the system
board.

To replace the memory module,
reverse the previous procedures.

Return to Removal & Replacement
Procedures