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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.
Copyright 1994, 1995 Compaq Computer Corporation.
All rights reserved. Printed in the U.S.A.
Compaq, Deskpro, LTE, Contura, Presario, ProLinea
Registered U. S. Patent and Trademark Office.
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 CONTURA 400 FAMILY OF PERSONAL COMPUTERS
Second Edition (June 1995)
First Edition (September 1994)
Part Number 147951-002
Preface
This Maintenance and Service Guide is used for reference when servicing
the Compaq Contura 400 Family of Personal Computers.
Compaq Computer Corporation reserves the right to make changes to the
Compaq Contura 400 Family of Personal 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
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
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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, no one should 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.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Locating Additional Information
The following documentation is available:
o Compaq Contura 400 Family Documentation:
- QUICK SETUP
- BEYOND SETUP
- ONLINE USER'S GUIDE
o Compaq Service Quick Reference Guide
o Service Training Guides
o Compaq Service Advisories and Bulletins
o Compaq QuickFind
Chapter 1. Illustrated Parts Catalog
Introduction
Chapter 1.1 Illustrated Parts Breakdown
The computer combines a display assembly and system unit module. The
display and system unit module are joined together by clutches on either
side secured by screws in the chassis and display enclosure allowing it to
open and close. The system unit module is secured to the CPU base by screw
locks in the rear and screws in the bottom of the system unit enclosure.
The display assembly is secured by screws installed in the front bezel of
the display enclosure.
This chapter provides a description of the system unit module, display
assembly, docking base, and monitor support cover. It includes a complete
parts breakdown.
Chapter 1.2 Serial Number
The computer serial numbers should be provided to Compaq whenever
requesting information or ordering spare parts. The serial number is
located on the bottom of the computer.
The serial number on the Docking Base is located on the rear of the base.
Chapter 1.3 System Unit Module Overview
The system unit module (Figure 1-4) contains the following upgradable
components:
o Hard drive
o Memory expansion board
o Processor upgrade (Contura 400 only)
A complete list of replaceable parts is included in Table 1-1. Major
components include:
o Battery pack and compartment components
o Keyboard assembly
o Integrated trackball assembly
o Diskette drive
o System board
o PC Card (PCMCIA) ejector rails and components
The hard drive, memory expansion board, and battery pack are accessed from
the bottom of the computer. To service the remaining system unit module
components, the keyboard assembly must be removed. Most major components
connect directly to the system board by connectors. The only cables in
this unit are the display assembly cable, the display ground cable, and
diskette drive cable.
Compaq Contura Models
Table 1-1 lists the Compaq Contura 400 Family of Personal Computer Models
and standard features.
Table 1-1. Compaq Contura 400 Family of Personal Computer Models
===========================================================================
Model
Processor
Hard Drive Memory
Display
===========================================================================
Contura 400
Contura 400
Contura 400C
486 DX2/40 MHz
486 DX2/40 MHz
486 DX2/40 MHz
170 MB
250 MB
250 MB
250 MB
250 MB
250 MB
350 MB
350 MB
350 MB
420 MB
420 MB
4 MB
4 MB
4 MB
4 MB
4 MB
4 MB
4 MB
4 MB
4 MB
8 MB
8 MB
8 MB
8 MB
8 MB
9.5 in Monochrome
9.5 in Monochrome
9.5 in Color STN
8.4 in. Color TFT
9.5 in Monochrome
9.5 in Color STN
9.5 in Color STN
8.4 in. Color TFT
10.4 in. Color STN
10.4 in. Color STN
10.4 in. Color TFT
10.4 in. Color STN
10.4 in. Color STN
10.4 in. Color TFT
Contura 400CX 486 DX2/40 MHz
Contura 410
Contura 410C
Contura 410C
486 DX2/50 MHz
486 DX2/50 MHz
486 DX2/50 MHz
Contura 410CX 486 DX2/50 MHz
Contura 420C
Contura 420C
486 DX4/75 MHz
486 DX4/75 MHz
Contura 420CX 486 DX4/75 MHz
Contura 430C
Contura 430C
486 DX4/100 MHz 420 MB
486 DX4/100 MHz 720 MB
Contura 430CX 486 DX4/100 MHz 720 MB
---------------------------------------------------------------------------
Note: Processor, hard drive and memory upgrades are available for most
models
===========================================================================
Models 400 and 410
This section provides a description of the system unit module components
for Models 400 and 410. These components are accessed from the bottom of
the computer:
o Hard drive -- The hard drive is easily replaced or upgraded from the
bottom of the computer. Remove two screws from the hard drive
compartment cover to access the hard drive. The hard drive mounts to the
system chassis with a hard drive bracket and connects directly to the
system board with no intervening cables. The hard drive bracket attaches
to the hard drive with four screws.
o Memory expansion -- System memory can be upgraded with optional memory
expansion boards. An expansion board is added or replaced from the
bottom of the computer through the memory compartment cover. The memory
expansion board connects directly to the system board with two
connectors.
o Battery pack -- The Nickel Metal Hydride battery pack is accessed
through the battery compartment.
To access the remaining system unit components, open the computer and
remove the keyboard assembly. These components include the following:
o Integrated trackball assembly -- The mechanical trackball is centrally
located at the bottom of the keyboard assembly. The assembly consists of
the trackball, retaining ring, and connector. The trackball assembly
connects directly to the system board and is secured by one screw. It
cannot be replaced with the optical trackball used in the Models 420 and
430. The mechanical trackball and optical trackball are not
interchangeable.
o System board -- The system board is mounted directly to the system
chassis. All removable components connected to the system board, except
for the PC Card rails, must be removed prior to removing the system
board. The system board is unique and cannot be replaced by the one
used in the Models 420 and 430.
o Processor upgrade -- Systems that come with the DX2/40 MHz processor can
be upgraded to the DX2/50 MHz processor. Place the upgrade processor into
the two connectors on the system board (Refer to "Removal and
Replacement Procedures, Section 3.11). Once installed, the processor
overrides control of the system board processor. The system board
processor is not removable.
o Real-Time Clock Battery -- This battery is located directly behind the
Trackball.
o PC Card rails -- The PC Card rails are replaceable and are secured by
two screws from the bottom of the system board and a clip on top of the
rails. The rails are not interchangeable with those used in Models 420
and 430. The clip is common between all models. The header attaches
directly to the system board and cannot be removed. The top and bottom
PC Card ejection levers are replaceable, but are not interchangeable
with those used in the Models 420 and 430.
o Diskette drive -- The diskette drive attaches to the system board by a
bracket and three screws. It is connected by a diskette drive cable and
LIF connector. The bracket attaches to the drive with four screws. The
drive is protected by an insulator between the system board and the
drive.
Models 420 and 430
This section provides a description of the system unit module components
for Models 420 and 430. These components are accessed from the bottom of
the computer:
o Hard drive -- The hard drive is easily replaced or upgraded from the
bottom of the computer. Remove two screws from the hard drive
compartment cover to access the hard drive. The hard drive mounts to the
system chassis with a hard drive bracket and connects directly to the
system board with no intervening cables. The hard drive bracket attaches
to the hard drive with four screws.
o Memory expansion -- System memory can be upgraded with optional memory
expansion boards. An expansion board is added or replaced from the
bottom of the computer through the memory compartment cover. The memory
expansion board connects directly to the system board with two connectors.
o Battery pack -- The Nickel Metal Hydride battery pack is accessed
through the battery compartment.
To access the remaining system unit components, open the computer and
remove the keyboard assembly. These components include the following:
o Integrated trackball assembly -- This optical trackball is centrally
located at the bottom of the keyboard assembly. The assembly consists of
the trackball, retaining ring, and connector. The trackball assembly
connects directly to the system board and is secured by two screws. It
cannot be replaced with the mechanical trackball used in the Compaq
Models 400 and 410. The optical trackball and mechanical trackball are
not interchangeable among computer models.
o System board -- The system board is mounted directly to the system
chassis. All removable components connected to the system board, except
for the PC Card rails, must be removed prior to removing the system
board. The system board is unique and cannot be replaced by the one
used in the Compaq Models 400 and 410.
o Processor upgrade -- Models 420 and 430 are equipped with either a
DX4/75 MHz or a DX4/100 MHz processor on the system board. There are no
upgrade provisions for these models.
o Real-Time Clock Battery -- This battery is located in the left rear area
of the system board.
o PC Card rails -- The PC Card rails are replaceable and are secured by
two screws from the bottom of the system board and a clip on top of the
rails. The rails are not interchangeable with those used in Models 420
and 430. The clip is common between all models. The header attaches
directly to the system board and cannot be removed. The top and bottom
PC Card ejection levers are replaceable, but are not interchangeable
with those used in the Models 400 and 410.
o Diskette drive -- The diskette drive attaches to the system board by a
bracket and three screws. It is connected by a diskette drive cable and
LIF connector. The bracket attaches to the drive with four screws. The
drive is protected by an insulator between the system board and the
drive.
Chapter 1.4 Display Assembly Overview
Display Assembly Description
This section provides a description of the display assembly and
components.
All display assemblies (Figure 1-5 and Figure 1-6) include the following
replaceable parts:
o Bezel
o Enclosure latches
o Inverter board
o Liquid crystal display (LCD) panel
o Shield
o Enclosure
o Display cable and display ground cable
To replace the display assembly, the assembly must be removed from the
system unit module. This is done by removing the keyboard assembly,
disconnecting the display cable and display ground cable from the system
unit module, removing the tilt feet and handle brackets, removing the rear
clutch screws, and lifting off the display assembly.
To service display components, do not remove the display assembly from the
system unit module (unless the display enclosure or clutch replacement is
required). Access display components (inverter board or latches) by
removing the bezel secured with four screws on the front of the display.
The display cable is a prefolded, flex cable that connects to the display
inverter board with a low insertion force (LIF) connector. The other end
of the display cable is exposed at the bottom of the display enclosure and
connects to the system board with a zero insertion force (ZIF) slide
connector.
The display ground cable connects to the display shield on one end, and
the other end clips to a LIF-type spring clip located above the serial
port between the system board and system chassis.
The display inverter board is aligned to the right of the display
enclosure with pins. One end connects to the display cable; the other end
connects to the backlight cable of the LCD panel.
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