compaq contura 400 family User Manual

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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 >>>>>>>
						

							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 400 486 DX2/40 MHz 170 MB 4 MB 9.5 in Monochrome
Contura 400 486 DX2/40 MHz 250 MB 4 MB 9.5 in Monochrome
Contura 400C 486 DX2/40 MHz 250 MB 4 MB 9.5 in Color STN
Contura 400CX 486 DX2/40 MHz 250 MB 4 MB 8.4 in. Color TFT
Contura 410 486 DX2/50 MHz 250 MB 4 MB 9.5 in Monochrome
Contura 410C 486 DX2/50 MHz 250 MB 4 MB 9.5 in Color STN
Contura 410C 486 DX2/50 MHz 350 MB 4 MB 9.5 in Color STN
Contura 410CX 486 DX2/50 MHz 350 MB 4 MB 8.4 in. Color TFT
Contura 420C 486 DX4/75 MHz 350 MB 4 MB 10.4 in. Color STN
Contura 420C 486 DX4/75 MHz 420 MB 8 MB 10.4 in. Color STN
Contura 420CX 486 DX4/75 MHz 420 MB 8 MB 10.4 in. Color TFT
Contura 430C 486 DX4/100 MHz 420 MB 8 MB 10.4 in. Color STN
Contura 430C 486 DX4/100 MHz 720 MB 8 MB 10.4 in. Color STN
Contura 430CX 486 DX4/100 MHz 720 MB 8 MB 10.4 in. Color TFT
---------------------------------------------------------------------------
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  th e system  board  with  two  connectors. 
						

							o Battery pack -- The Nickel Metal Hydride battery pack is accessedthrough 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