Compaq Presario 1905 User manual

Thank you for purchasing this Factory Service
Manual CD/DVD from servicemanuals4u.com.
Please check out our eBay auctions for more great
deals on Factory Service Manuals:
servicemanuals4u

Compaq.com - Compaq Discovery 1900 Series Maintenance and Service Guide - Models: 1905, 1910, 1915, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| 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
Status Panel
Left Side
Components
Right Side
Components
Bottom of
Unit
Left Side
and Top
Wedge
Components
Right Side
Wedge
Components
Rear
Connectors
Port
Replicator
Connectors
Welcome to the Maintenance & Service Guide (MSG). This online guide is designed to
serve the needs of those whose job it is to repair Compaq products. Many of the
components of the hardcopy MSG are contained in this online guide. The Notice,
contains the copyright and trademark information. The Preface shows symbol
conventions, Technician Notes and Serial Number locations on the unit.
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/index.html (1 of 2)6/27/2004 5:04:32 AM

Compaq.com - Compaq Discovery 1900 Series Maintenance and Service Guide - Models: 1905, 1910, 1915, and 1920
Port
Replicator
Components
Power
Management
This MSG will be periodically maintained and updated online as needed.
For content comments or questions, contact the Editor.
To report a technical problem, contact your Regional Support Center or IM Help
Center.
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...%201915%201919%201920%201922%201925/index.html (2 of 2)6/27/2004 5:04:32 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| 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.
Ó 1998 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
Compaq, Presario 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 1900 Series Portable Computers
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/notice.html (1 of 2)6/27/2004 5:04:38 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
First Edition (Oct. 1998)
Compaq Computer Corporation
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...201915%201919%201920%201922%201925/notice.html (2 of 2)6/27/2004 5:04:38 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1815, 1820, and 1825
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| 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 1900 Series Portable Computers.
Compaq Computer Corporation reserves the right to make changes to the Compaq Presario 1900 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
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/preface.html (1 of 2)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1815, 1820, and 1825
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 1900 Series Portable Computer documentation set
●Introducing Windows 98 Guide
●Service Training Guides
●Compaq Service Advisories and Bulletins
●Compaq QuickFind
●Compaq Service Quick Reference Guide
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/preface.html (2 of 2)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| 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
Status Panel
Left Side
Components
Right Side
Components
Bottom of
Unit
Left Side
and Top
Wedge
Components
Right Side
Wedge
Components
Rear
Connectors
Compaq
Presario
1900 Series
Portable
Computers
are a new
generation
of
multimedia
portable
computers
with an
ultimate thin
and light-
weight
design,
outstanding
audio and
video,
advanced
core
features,
and
attractive
styling.
The
Removable
Drive Wedge
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/product.html (1 of 3)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
Port
Replicator
Connectors
Port
Replicator
Components
Power
Management
provides
multimedia
expansion
capability
with a DVD
or CD-ROM
Drive and a
Diskette
Drive or LS-
120 Drive
integrated
into one
removable
component.
Compaq
Presario
1900 Series
Portable
Computers
also have an
optional
integrated
10/100BaseT
Ethernet
Port
Replicator
allowing the
user to
quickly and
easily attach
or detach
the
computer
from
peripheral
devices. It
contains a
full array of
ports, some
which are
accessible
while the
system is
docked to
the Port
Replicator.
This full-
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/product.html (2 of 3)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
function
Intel Celeron
and Pentium
II - based
portable
computer
provides full
desktop
functionality.
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/product.html (3 of 3)6/27/2004 5:04:39 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| 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 1900 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.
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/trouble.html (1 of 2)6/27/2004 5:04:40 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
NOTE:
If the problem is
intermittent, check the
computer several times to
verify that the problem is
solved.
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...201915%201919%201920%201922%201925/trouble.html (2 of 2)6/27/2004 5:04:40 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| Home Page | Notice |Preface |Product Description | Troubleshooting
Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications
Pin Assignments | Battery Pack Operations
System Unit
Boards
Display
Assembly
Mass Storage
Devices
Miscellaneous
Hardware and
Plastics Kit
Miscellaneous
Hardware and
Plastics Wedge
Kit
Miscellaneous
Parts
Documentation
and Software
This
section
provides
an
illustrated
parts
breakdown
and a
reference
for spare
parts for
the
Presario
1900
Series
Portable
Computer.
The
computer
(1) serial
number
should be
provided to
Compaq
whenever
requesting
information
or ordering
spare
parts. The
serial
number is
located on
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/illustra.html (1 of 2)6/27/2004 5:04:41 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
bottom of
unit.
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/illustra.html (2 of 2)6/27/2004 5:04:41 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| 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
Electrostatic
Discharge
Service
Considerations
Cables and
Connectors
Preparing the
Computer for
Disassembly
Battery Pack
Hard Drive
Keyboard
Memory
Module
Modem
Heatspreader
Processor
Display Panel
Assembly
Report the
computer
serial
number to
Compaq
when
requesting
information
or ordering
spare
parts. The
serial
number is
located on
bottom of
unit.
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/removal.html (1 of 2)6/27/2004 5:04:42 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
Upper CPU
Cover with
Palmrest and
TouchPad
Hard Drive/
Battery
Charger Board
Converter
Board
Low Voltage
Differential
Signal Board
Fan Assembly
System Board
Speaker
Assembly
Disassembling
the Wedge
DVD or CD
Drive
System to
Wedge
Interface
Board
Diskette Drive
Wedge to Port
Replicator
Interface
Board
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...01915%201919%201920%201922%201925/removal.html (2 of 2)6/27/2004 5:04:42 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| Home Page | Notice | Preface | Product Description | Troubleshooting
| Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications
Pin Assignments | Battery Pack Operations
Specifications
This chapter covers the following specifications of Compaq Presario 1900 Series Portable
Computers:
●Physical and Environmental
●System Interrupts
●System DMA
●System I/O Addresses
●System Memory Catalog
●Display
●Diskette Drive or LS-120 Drive
●Hard Drive
●CD ROM or DVD Drive
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/specific.html (1 of 2)6/27/2004 5:04:44 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
1.800.AT.COMPAQ
privacy and legal statement
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20check...01915%201919%201920%201922%201925/specific.html (2 of 2)6/27/2004 5:04:44 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
United States June 27, 2004
COMPAQ
STORE | PRODUCTS | SERVICES | SUPPORT | CONTACT US |
SEARCH
Maintenance & Service Guide
Presario 1900 Series
Models: 1905, 1906, 1910, 1915, 1919, 1920, 1922, and 1925
| Home Page | Notice |Preface |Product Description | Troubleshooting
Illustrated Parts Catalog | Removal & Replacement Procedures | Specifications
Pin Assignments | Battery Pack Operations
Connector Pin Assignments
This appendix provides connector pin assignment tables for Compaq Presario 1900 Series Portable
Computers. For more information on connectors, refer to the section on Rear 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
Serial Connector
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...10%201915%201919%201920%201922%201925/pin.html (1 of 4)6/27/2004 5:04:45 AM

Compaq.com - Compaq Presario 1900 Series Maintenance and Service Guide - Models: 1905, 1906, 1910, 1915, 1919, and 1920
Connector Pin Signal
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
Connector Pin Signal
1
2
3
4
5
6
Data
Not defined
Ground
+5 VDC
Clock
Not defined
External VGA Monitor Connector
Connector Pin Signal
file:///C|/SERVICE%20MANUALS/COMPAQ%20_%20chec...10%201915%201919%201920%201922%201925/pin.html (2 of 4)6/27/2004 5:04:45 AM