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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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
Download the Maintenance and Service Guide (MSG) to your hard drive.
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
Notice contains the copyright and trademark
information. The
Preface shows symbol conventions, Technician Notes and
Serial Number locations on the unit.
This MSG will be periodically maintained and updated online as needed. For
content comments or questions, contact the Editor.
To report a technical problem, contact your Regional Support Center or IM
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Power
Management
for Windows
98
Help Center.
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COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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)
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Compaq Computer Corporation
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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.
NOTE:
Text set off in this manner presents commentary, sidelights, or interesting points of information.
Technician Notes
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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
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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
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
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Power
Management
for Windows
98
outstanding
and
innovative
features and
components.
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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
Power-On Self
Test (POST)
Compaq
Diagnostics
Diagnostic Error
Codes
Troubleshooting
Without
Diagnostics
Solving Minor
Problems
Contacting
Compaq
Support
This section covers troubleshooting information for the Compaq Presario 1800
Series Portable Computers. The basic steps in troubleshooting include:
1. Follow the Preliminary Steps.
2. Run the Power-On Self-Test (POST).
3. Follow the recommended actions described in the diagnostic tables if
you are unable to run POST or if POST displays an error message.
When following the recommended actions in the Sections on POST and
Diagnostic Error Codes perform them in the order listed. Rerun POST
after each recommended action until the problem is solved and no error
message occurs. Once the problem is solved, do not complete the
remaining recommended actions.
NOTE:
If the problem is intermittent, check the computer several
times to verify that the problem is solved.
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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.
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide - Models: 1825, 1826, 1827, 1830, 1800T
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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
Processor
Report the computer serial number to Compaq when requesting information or ordering spare
parts. The serial number is located on the underside of the computer.
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DVD or
CD Drive
Display Panel
Assembly
Upper CPU
Cover
Fan Assembly
Diskette Drive
Battery
Charger Board
Speaker
Assembly
System Board
Memory
Module
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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
Computer Specifications
U.S. Metric
Dimensions
Height
Depth
Width
1.65 in
13.00 in
10.99 in
4.20 cm
33.00 cm
27.90 cm
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Weight
7.9 lbs 3.58 kg
Stand-Alone (Battery Pack) Power
Requirements
Nominal Operating
Maximum Average
Peak Operating
Li-ion 3.2 mAh
W @ 14.8 V
W @ 14.8 V
W @ 14.8 V
AC Power Requirements
Operating Voltage
Operating Current
Operating Frequency
Maximum Transient
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
50° to 95 °F
-4° to 140 °F
10° to 35 °C
-20° to 60 °C
Relative Humidity (noncondensing)
Operating
Nonoperating (tw = 38.7°C max)
90%
5% to 95%
10% to 90%
5% to 95%
Altitude
Operating
Nonoperating
0 to 10,000 ft
0 to 30,000 ft
0 to 3.05 km
0 to 9.14 km
Shock
Operating
Non operating
10 G, 11 ms, half sine
240 G, 2 ms, half sine
Vibration
Operating
Nonoperating
0.5 G
1.5 G
NOTE: Applicable product safety standards specify thermal limits for plastic surfaces. Compaq
Explorer Series Portable Computers operate well within this range of temperatures.
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System Interrupts
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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
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System DMA
System DMA
Hardware DMA System Function
DMA 1 ESS SOLO-1 DOS Emulation
DMA 2 Standard Floppy Disk Controller
DMA 3 ECP Printer Port (LPT1)
DMA 4 Direct memory access controller
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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
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0060h-0060h Standard 101/102-Key or Microsoft Natural Keyboard
0061h-0061h System speaker
0064h-0064h Standard 101/102-Key or Microsoft Natural 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
0170h-0177h Intel 82371AB/EB PCI Bus Master IDE controller
0170h-0177h Secondary IDE controller (dual fifo)
01F0h-01F7h Intel 82371AB/EB PCI Bus Master IDE 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
0376h-0376h Intel 82371AB/EB PCI Bus Master IDE 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
03F6h-03F6h Intel 82371AB/EB PCI Bus Master IDE 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
E000h-EFFFh Intel 82443BX Pentium ® II Processor to AGP 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
FC00h-FC7Fh Intel 21143/2 based 10/100 mbps Ethernet Controller
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FC88h-FC8Fh Lucent 56K V.90 PCI DF Modem
FC90h-FC97h Primary IDE controller (dual fifo)
FC90h-FC9Fh Intel 822371AB/EB PCI Bus Master IDE 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
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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
15.0" (Diagonal) TFT Display with LVDS
U.S. Metric
Dimensions
Height
Width
9.48 in
12.43 in
24.05 cm
31.55 cm
Display Dimensions
Height
Width
Depth
8.99 in
11.98 in
Information not available
22.81 cm
30.41 cm
Information not
available
Weight
24.36 oz 690 gm
Contrast Ratio
150:1 mini
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Brightness
120 cd/mm^3
Total Power Consumption
Information not available
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14.1" (Diagonal) TFT Display with LVDS
U.S. Metric
Dimensions
Height
Width
8.92 in
11.76 in
22.65 cm
29.85 cm
Display Dimensions
Height
Width
Depth
8.44 in
11.26 in
Information not
available
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
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Memory Expansion
Memory Expansion
System Memory Expansion Board Memory Total Memory
64-MB
64-MB
64-MB
32-MB 96-MB
64-MB
64-MB 128-MB
64-MB
128-MB 192-MB
Diskette or LS120 Drive
Diskette Drive LS120 Drive
Capacity per Diskette (High/Low)
1.44 MB/720KB 120 MB
Diskette Size
3.5" 3.5"
Number of LED Indicators (Read/Write)
0 1
Number of Drives Supported
1 1
Drive Rotation (rpm)
300 720
Transfer Rate (Kbps)
500 5458
Bytes per Sector
512 512
Sectors per Track (High/Low)
18/9
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Tracks per Side (High/Low)
80
Access Times
Track-to-Track (ms)
Average (ms)
Setting Time (ms)
Latency Average (ms)
3
94
15
100
20
112
800
41.67
Cylinders (High/Low)
80 1736
Number of Read/Write Heads
2 2
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Hard Drive
Hard Drive
4.8-GB 6.4-GB 10.0-GB 18.0-GB
Capacity Per Drive
4.8-GB 6.4-GB 10.0-GB 18.0-GB
Drive Type
Logical Configuration
Cylinders
Heads
Sectors per track
Bytes per sector
11648
3
190/330
512
8647
4
190/330
512
11968
6
190/330
512
16383
6
Not available
512
Seek Times
(Typical, Including settling in ms)
Single track
Average
Full stroke
4
14
24
4
14
24
4
14
24
2.5 (Read)
12 (Read)
23 (Read)
Transfer Rate At Interface
33.3 MB/s 33.3 MB/s 33.3 MB/s 33.3 MB/s
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CD/DVD Drive
CD/DVD Drive
4x DVD 6x DVD 24x CD-ROM
Dimensions
128 x 129 x 12.7 mm 128 x 129 x 12.7mm 128 x 129 x 12.7
mm
Weight
0.27 kg 0.28 kg <0.27 kg
Rotational Speed
2300 rpm 3450 rpm 4225 rpm
Typical Transfer Rate
Sustained Data Transfer Rate
5400 KB/s
8100 KB/s 3600 KB/s
Access Time
Average Random Access Time
140 ms
140 ms 120 ms
Spin Up time
3.8 s <15 s 2.7 s
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Data Buffer Capacity
128 KB 512 KB 128 KB
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Battery Pack
Battery Pack
Lithium Ion (Li ion) *
Dimensions
Height
Length
Width
0.8 in (20.3 mm)
5.7 in (145 mm)
3.1 in (78.7 mm)
Weight
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.
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COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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
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Serial Connector
Connector Pin Signal
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1
2
3
4
5
6
7
8
9
Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
Data Set Ready
Ready to Send
Clear to Send
Ring Indicator
Keyboard/Mouse
Connector Pin Signal
1
2
3
4
5
6
Data 1
Data 2
Ground
+5 V
Clock 1
Clock 2
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External VGA Monitor
Connector Pin Signal
1
2
3
4
5
6
7
Red Analog
Green Analog
Blue Analog
Not connected
Ground
Ground Analog
Ground Analog
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8
9
10
11
12
13
14
15
Ground Analog
+5V
Ground
Monitor Detect
DDC2B Data
Horizontal Sync
Vertical Sync
DDC2B Clock
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Universal Serial Bus
Connector Pin Signal
1
2
3
4
+5V
Data Data +
Ground
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Modem
Connector Pin Signal
1
2
3
4
5
6
Unused
Tip
Ring
Unused
Unused
Unused
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TV Out
Connector Pin Signal
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1
2
3
Ground
Composite
Ground
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Game Port
Connector Pin Signal
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
+5V
SWA
RBTA
GND
GND
RBTB
SWB
+5V
+5V
SWC
RBTC
RMSO
RBTD
SWD
RMSI
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S Video
Connector Pin Signal
1
2
3
4
Ground
Ground
SYR
SCG
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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
37 Red 57 Joystick Data C 77 S-Video SYR
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
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privacy and legal statement
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
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.
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
● 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.
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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
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Disposing of a Used Battery Pack
In the interest of safeguarding our environment. Compaq Computer Corporation recommends that nickel metal
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Compaq.com - Compaq Presario 1800 Series Maintenance and Service Guide
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.
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