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Notice

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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.

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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 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

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 400 486 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

o Memory expansion -- System memory can be upgraded with optional memory

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

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

o Diskette drive -- The diskette drive attaches to the system board by a

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.

Chapter 1.5 Docking Base

The docking base includes the following replaceable parts:

o Battery door

o Feet

o Handle

Chapter 1.6 Monitor Support Cover

The monitor support cover is used with the docking base. The foot on the monitor support cover is the only replaceable part.

Chapter 1.7 System Unit Module Parts

Table 1-2. System Unit Module -- Models 400 and 410 ===========================================================================

Spare Part

Description Number Notes

===========================================================================

1. Base enclosure 147856-001 Includes: a. PC Card eject levers, pin, door,

and spring b. battery latch button and spring c. handle bracket, screws and

washers d. battery shield, insulator e. tilt foot and screws f. warning label * g. anti-skid pads * h. memory door *

---------------------------------------------------------------------------

2. System board Include PC Card ejector rails, hard

- 486 DX2/40 MHz 147944-001 drive insulators, and gasket.

- 486 DX2/50 MHz 147621-001

---------------------------------------------------------------------------

3. Diskette drive bracket 147857-001

---------------------------------------------------------------------------

4. Diskette drive 147963-001

---------------------------------------------------------------------------

5. Processor upgrade 486 DX2/50 MHz 169644-001

---------------------------------------------------------------------------

6. Real-time clock battery 117099-001

---------------------------------------------------------------------------

7. Mechanical Trackball 147876-001

---------------------------------------------------------------------------

8. PC Card ejection Includes the following and screws *. assembly 147871-001 a. rails

b. clip c. screws *

---------------------------------------------------------------------------

9. Chassis 147865-001

---------------------------------------------------------------------------

10. Clutches 147858-002 Includes: a. left b. right

---------------------------------------------------------------------------

11. Hard drive *

- 350 MB 189111-001 Does not include hard drive bracket.

- 250 MB 199233-001

- 170 MB 169685-001

---------------------------------------------------------------------------

12. Hard drive

bracket * 147872-001

---------------------------------------------------------------------------

13. Memory expansion

board *

- 4 MB 147654-001

- 8 MB 147656-001

- 16 MB 147658-001

- 24 MB 189261-001

---------------------------------------------------------------------------

14. NiMH battery

pack * 190626-001

---------------------------------------------------------------------------

15. Screws kit * 147885-001

---------------------------------------------------------------------------

* Not Shown ===========================================================================

Table 1-3. System Unit Module -- Models 420 and 430 ===========================================================================

Spare Part Description Number Notes ===========================================================================

1. Base enclosure 189239-001 Includes: a. PC Card eject levers, pin, door,

and spring b. battery latch button and spring c. handle bracket, screws and

washers d. battery shield, insulator e. tilt foot and screws f. warning label * g. anti-skid pads * h. memory door *

---------------------------------------------------------------------------

2. System board Includes PC Card ejector rails,

- 486 DX4/75 MHz 189115-001 hard drive insulators, and gasket 4MB

- 486 DX4/75 MHz 189116-001 8MB

- 486 DX4/100 MHz 189134-001 8MB

---------------------------------------------------------------------------

3. Diskette drive bracket 189240-001

---------------------------------------------------------------------------

4. Diskette drive 147963-001

---------------------------------------------------------------------------

5. Real-time clock battery 117099-001

---------------------------------------------------------------------------

6. Optical Trackball assembly 189197-001

---------------------------------------------------------------------------

7. PC Card ejection Includes the following and screws *. assembly 189242-001 a. rails

b. clip c. screws *

---------------------------------------------------------------------------

8. Chassis 189241-001

---------------------------------------------------------------------------

9. Clutches 147858-001 Includes:

a. left b. right

---------------------------------------------------------------------------

10. Hard drive * Does not include hard drive bracket.

- 720 MB 189156-001

- 540 MB 189132-001

- 420 MB 189112-001

- 350 MB 189111-001

---------------------------------------------------------------------------

11. Hard drive bracket * 147872-001

---------------------------------------------------------------------------

12. Memory expansion board *

- 4 MB 147654-001

- 8 MB 147656-001

- 16 MB 147658-001

- 24 MB 189261-001

---------------------------------------------------------------------------

13. NiMH battery pack * 190626-001

---------------------------------------------------------------------------

14. Screws kit * 147885-001

---------------------------------------------------------------------------

* Not Shown ===========================================================================

Chapter 1.8 Monochrome Display Assembly Parts

Table 1-4. Monochrome Display Assembly -- Models 400 and 410 =========================================================================== Description Spare Part Number Notes ===========================================================================

1. Display bezel 147882-001

2. Backlight inverter

board 147622-001

3. Display panel 147877-001 Includes labels and shield

4. Display cables 147884-001 Includes:

a. display cable b. display ground cable

5. Display clutch 147858-001 Includes screws for handle

(left and right) bracket, washer, tilt feet

6. Display enclosure 147880-001 Includes enclosure, latch,

kit spring, and logo

7. Screw kit * 147885-001

---------------------------------------------------------------------------

* Not Shown ===========================================================================

Chapter 1.9 Color STN (9.5 inch) Display Assembly Parts

Table 1-5. CSTN (9.5 inch) Display Assembly -- Models 400 and 410 =========================================================================== Description Spare Part Number Notes ===========================================================================

1. Display bezel 147883-001

2. Backlight inverter

board 147624-001

3. Display panel 147878-001 Includes labels and shield

4. Display cables 147884-001 Includes:

a. display cable b. display ground cable

5. Display clutch 147858-001 Includes screws for handle

(left and right) bracket, washer, tilt feet

6. Display enclosure 147881-001 Includes enclosure, latch,

kit spring, and logo

7. Screw kit * 147885-001

---------------------------------------------------------------------------

* Not Shown

===========================================================================

Chapter 1.10 Color STN (10.4 inch) Display Assembly Parts

Table 1-6. CSTN (10.4 inch) Display Assembly -- Models 420 and 430 ===========================================================================

Spare Part Description Number Notes ===========================================================================

1. Display bezel 189246-001

2. Backlight inverter

board 189135-001

3. Display panel 189113-001 Includes labels and shield

4. Display cables 189247-001 Includes:

a. display cable b. display ground cable c. XOVER board

5. Display clutch Includes screws for handle

(left and right) 147858-001 bracket, washer, tilt feet

6. Display enclosure Includes enclosure, latch,

kit 189245-001 spring, logo and pad for

Sharp CSTN

7. Screw kit * 147885-001

--------------------------------------------------------------------------* Not Shown ===========================================================================

Chapter 1.11 Color TFT (8.4 inch) Display Assembly Parts

Table 1-7. CTFT (8.4 inch) Display Assembly -- Models 400 and 410 ===========================================================================

Spare Part Description Number Notes ===========================================================================

1. Display bezel 147869-001

2. Backlight inverter

board 147624-001

3. Display panel 147879-001 Includes labels and shield

4. Display cables 147884-001 Includes:

a. display cable b. display ground cable

5. Display clutch Includes screws for handle

(left and right) 147858-001 bracket, washer, tilt feet

6. Display enclosure Includes enclosure, latch,

kit 147881-001 spring, and logo

7. Screw kit * 147885-001

--------------------------------------------------------------------------* Not Shown ===========================================================================

Chapter 1.12 Color TFT (10.4 inch) Display Assembly Parts

Table 1-8. CTFT (10.4 inch) Display Assembly -- Models 420 and 430 ===========================================================================

Spare Part Description Number Notes ===========================================================================

1. Display bezel 189244-001

2. Backlight inverter

board 189136-001

3. Display panel 189114-001 Includes labels and shield

4. Display cables 189247-001 Includes:

a. display cable b. display ground cable

5. Display clutch Includes screws for handle

(left and right) 147858-001 bracket, washer, tilt feet

6. Display enclosure Includes enclosure, latch,

kit 189243-001 spring, and logo.

7. Screw kit * 147885-001

--------------------------------------------------------------------------* Not Shown ===========================================================================

Chapter 1.13 Keyboards

Table 1-9. Contura Notebook Keyboards =========================================================================== Description Spare Part Number

===========================================================================

1. CPU Cover Includes: 147860-001 a. PC Card door b. spring * c. indicator panel d. light deflector

2. U.S. 147875-001

3. U.K. 147875-003 *

4. German 147875-004 *

5. French 147875-005 *

6. Italian 147875-006 *

7. Spanish 147875-007 *

8. Danish 147875-008 *

9. Norwegian 147875-009 *

10. Swedish/Finnish 147875-010 *

11. Swiss 147875-011 *

12. French Canadian 147875-012 *

13. Portuguese 147875-013 *

14. Latin American 147875-016 *

15. Belgian 147875-018 *

16. Japanese 147875-019 *

17. Korean 147875-033 *

18. Brazilian 147875-035 *

--------------------------------------------------------------------------* Not Shown ===========================================================================

Table 1-10. Contura Enhanced Keyboards =========================================================================== Description Spare Part Number ===========================================================================

1. Enhanced II Keyboard - Domestic 140536-101

2. Enhanced III Keyboard - U.K. 140536-103

3. Enhanced III Keyboard - German 140536-104 *

4. Enhanced III Keyboard - French 140536-105 *

5. Enhanced III Keyboard - Italian 140536-106 *

6. Enhanced III Keyboard - Spanish 140536-107 *

7. Enhanced III Keyboard - Danish 140536-108 *

8. Enhanced III Keyboard - Norwegian 140536-109 *

9. Enhanced III Keyboard - Swedish/Finnish 140536-110 *

10. Enhanced III Keyboard - Swiss 140536-111 *

11. Enhanced III Keyboard - French Canadian 140536-112 *

12. Enhanced III Keyboard - Portuguese 140536-113 *

)

13. Enhanced III Keyboard - Turkish 140536-114 *

14. Enhanced III Keyboard - Greek 140536-115 *

15. Enhanced III Keyboard - Latin American 140536-116 *

16. Enhanced III Keyboard - Arabic 140536-117 *

17. Enhanced III Keyboard - Belgian 140536-118 *

18. Enhanced III Keyboard - Japanese 140536-119 *

19. Enhanced III Keyboard - BHCSY ** 140536-120 *

20. Enhanced III Keyboard - Hungarian 140536-121 *

21. Enhanced III Keyboard - Polish 140536-122 *

22. Enhanced III Keyboard - Slovakian 140536-123 *

23. Enhanced III Keyboard - Russian 140536-124 *

24. Enhanced III Keyboard - Czech 140536-129 *

25. Enhanced III Keyboard - Thai 140536-130 *

26. Enhanced III Keyboard - Beijing 140536-132 *

27. Enhanced III Keyboard - Segul 140536-133 *

28. Enhanced III Keyboard - Taipei 140536-134 *

29. Enhanced III Keyboard - Brazil 140536-135 *

--------------------------------------------------------------------------* Not Shown

** Bosnia-Herzegovina, Croatia, Slovenia, and Yugoslavia ===========================================================================

Chapter 1.14 Cables (Models 400 and 410

Table 1-11. Cables for Models 400 and 410

)

=========================================================================== Description Spare Part Number ===========================================================================

1. Display cables 147884-001

a. CSTN (9.5 in) Models 400 and 410 b. MSTN (9.5 in) (Model 400 only) c. CTFT (8.4 in) Models 400 and 410 d. Ground cable for Models 400 and 410

---------------------------------------------------------------------------

2. Diskette cable 147866-001

===========================================================================

Chapter 1.15 Cables (Models 420 and 430

Table 1-12. Cables for Models 420 and 430 =========================================================================== Description Spare Part Number ===========================================================================

1. Display cables 189247-001

a. CTFT (10.4 in) Models 420 and 430 b. CSTN (10.4 in) Models 420 and 430 c. XOVER board for CSTN (10.4 in) only d. Ground cable for Models 420 and 430

---------------------------------------------------------------------------

2. Diskette cable 147866-001

===========================================================================

Chapter 1.16 Ac Adapter and Power Cord

Table 1-13. Contura AC Adapter and Power Cord =========================================================================== Description (All Models) Spare Part Numbers ===========================================================================

1. AC adapter with wallprongs 147679-001

2. AC adapter 147679-002

3. Power cord (U.S./Canada) 197230-001

4. Power cord (U.K.) 197232-001 *

5. Power cord (Europe) 197231-001 *

6. Power cord (Japan) 197233-001 *

7. Power cord (Australia) 197234-001 *

---------------------------------------------------------------------------

* Not shown ===========================================================================

Chapter 1.17 Memory and Processor

Table 1-14. Contura Memory and Processor =========================================================================== Description (All Models) Spare Part Numbers ===========================================================================

1. Memory expansion board

a. 4 MB 147654-001 b. 8 MB 147656-001 c. 16 MB 147658-001 d. 24 MB * 189261-001

2. Processor upgrade (Model 400 only)

486 DX2/50 MHz 169644-001

---------------------------------------------------------------------------

* Not Shown ===========================================================================

Chapter 1.18 Miscellaneous Carrying Devices

Table 1-15. Miscellaneous Carrying Devices =========================================================================== Description (All Models) Spare Part Numbers ===========================================================================

1. Briefcase, Ramie 129930-001

2. Slipcase 194162-001

3. Briefcase, SS (soft-sided) 121423-001 *

---------------------------------------------------------------------------

* Not Shown ===========================================================================

Chapter 1.19 Docking Base and Monitor Support Cover

Table 1-16. Docking Base and Monitor Support Cover =========================================================================== Description (All Models) Spare Part Numbers ===========================================================================

1. Docking Base - Ethernet 147675-001

2. Docking Base - pass-thru 147699-001

3. Docking base miscellaneous 169666-001

a. Battery door b. Feet c. Handle d. Screws (Quantity = 2)

4. Monitor support cover 147676-001

5. Monitor support cover foot 169681-001

---------------------------------------------------------------------------

* Not Shown ===========================================================================

Chapter 1.20 Miscellaneous CPU Kits

Table 1-17. Miscellaneous Contura CPU Kits

=========================================================================== Description Spare Part Number Spare Part Number

Models 400 & 410 Models 420 & 430 =========================================================================== Handle 147678-001 * 147678-001 *

--------------------------------------------------------------------------Automobile adapter 190551-002 * 190551-002 *

--------------------------------------------------------------------------Memory door assembly includes hard drive tray 169713-001 * 169713-001

--------------------------------------------------------------------------Carton, (Quantity = 5) 147862-001 * 147862-001 *

--------------------------------------------------------------------------Carton and buns, (Quantity = 1) 147863-001 * 147863-001 *

--------------------------------------------------------------------------Clutches (left and right) 147858-001 * 147858-001 *

--------------------------------------------------------------------------Anti-skid feet 147859-001 * 147859-001 *

--------------------------------------------------------------------------Plate logo 197251-001 * 189292-001 *

--------------------------------------------------------------------------Box, 420C 189265-001 *

--------------------------------------------------------------------------SpeedPaq 192 Data Fax Cellular 187123-001 Modem

--------------------------------------------------------------------------PC Card (PCMCIA) 288 Fax/Modem 189661-001 *

--------------------------------------------------------------------------PC Card (PCMCIA) 192 Fax/Modem 188512-001 *

--------------------------------------------------------------------------PC Card (PCMCIA) modem pouch 194133-001 *

--------------------------------------------------------------------------CA, TEL MED 187145-001 *

--------------------------------------------------------------------------Keyboard Warning Label, English 189288-001 *

--------------------------------------------------------------------------Country Kit 140204-001 *

--------------------------------------------------------------------------Trackball removal tool 147779-001 * 147779-001 *

--------------------------------------------------------------------------Miscellaneous 147874-001 * 189262-001 *

Includes: Trough Battery latch Battery tray PC Card door PC Card ejection levers and pin Extension spring (battery eject button,

display latches) Lock plate provision Keyboard ground clips Left clutch ground clip Right clutch ground clip Flex ground clip Hard Drive Tray

--------------------------------------------------------------------------* Not Shown ===========================================================================

Chapter 1.21 Fastener List

Table 1-18. Fastener Kit for All Models =========================================================================== Description: Spare Part Number

--------------------------------------------------------------------------Screws and Fastners Kit (Quantity = 25 each) 147885-001 ===========================================================================

=========================================================================== Description Type Where Used Part Number Drive Qty =========================================================================== M2.5 x 4.0 Truss Ground tabs on 144864-001 SL/T8 3 *

display shields

Diskette bracket 3 to system board

Hold down system 5 * board to base and 4 ** chassis

Trackball assembly 1 * to base 2 **

Battery contracts 2 to base/through system board

CPU cover to 7 keyboard

Clutches to 4 * display enclosure (Models 400 and

410)

--------------------------------------------------------------------------M2.5 x 5.0 Truss CPU base to 144865-007 SL/T8 4

clutches Blk 4 Display bezel to display enclosure

Ground tabs on 2 ** display shields (Models 420 and

430)

Clutches to 4 ** display enclosure (Models 420 and

430)

Display to display enclosure 4 **

--------------------------------------------------------------------------Description Type Where Used Part Number Drive Qty

---------------------------------------------------------------------------

M3.0 x 8.0 Pan Display to display 121187-007 SL/T8 4 **

enclosure

--------------------------------------------------------------------------M2.5 x 24.0 Truss CPU cover to CPU 144865-006 SL/T8 7

base

--------------------------------------------------------------------------M2.6 x 2.0 Fillister Diskette drive 121188-001 T8 4

to FDD bracket

--------------------------------------------------------------------------M3.0 x 3.6 Truss Hard drive to HDD 121187-001 T8 4

bracket

--------------------------------------------------------------------------M2.0 x 6.0 Fillister PC Card Header 126790-004 T8 2 **

--------------------------------------------------------------------------M2.0 x 15.5 Fillister PCMCIA rails 126790-010 T8 2

--------------------------------------------------------------------------Spring, PC Card door 147758-001 2 torsion actuation

--------------------------------------------------------------------------Spring, Battery latch 147759-001 1 extension return spring

Display latch 2 return spring

--------------------------------------------------------------------------Washer Under handle 147923-001 2

bracket

--------------------------------------------------------------------------M2.5 Shoulder Handle bracket to 147760-001 T8 2

clutch/through CPU base

--------------------------------------------------------------------------M2.5 Shoulder CPU foot to 147778-001 T8 2

clutch/through CPU base

--------------------------------------------------------------------------4-40 Screw Three connectors 106902-001 3/16 6

locks at rear of unit

--------------------------------------------------------------------------Alignment Shoulder Alignment screws 169643-001 T8 2 screws for docking base

connector

--------------------------------------------------------------------------* Models 400 and 410

** Models 420 and 430 ===========================================================================

Chapter 1.22 Documentation and Software

Table 1-19. Documentation and Software =========================================================================== Description (All Models) Spare Part Number =========================================================================== MAINTENANCE AND SERVICE GUIDE 147861-001

---------------------------------------------------------------------------

Online USER'S GUIDE

English 147990-001

German 147990-041 French 147990-051 Italian 147990-061 Spanish 147990-071 Netherlands 147990-331 Swedish 147990-101

---------------------------------------------------------------------------

Manuals - English 147989-001

QUICK SETUP BEYOND SETUP

---------------------------------------------------------------------------

Manuals - German 147989-041

QUICK SETUP BEYOND SETUP KEYBOARD REFERENCE

---------------------------------------------------------------------------

Manuals - French 147989-051

QUICK SETUP BEYOND SETUP KEYBOARD REFERENCE

---------------------------------------------------------------------------

Manuals - Italian 147989-061

QUICK SETUP BEYOND SETUP KEYBOARD REFERENCE

---------------------------------------------------------------------------

Manuals - Spanish 147989-071

QUICK SETUP BEYOND SETUP KEYBOARD REFERENCE

---------------------------------------------------------------------------

Manual - TABWORKS QUICK START GUIDE

English 195866-001 German 195866-041 French 195866-051 Italian 195866-061 Spanish 195866-071 Swedish 195866-101 Netherlands 195866-331

---------------------------------------------------------------------------

Manual - AMERICA ONLINE 181194-001

---------------------------------------------------------------------------

Manual - MS WORKS 196077-001

---------------------------------------------------------------------------

Manual - ESSENTIALS OF MS-DOS AND MS-WINDOWS

English 144958-001 German 144958-041 French 144958-051 Italian 144958-061 Spanish 144958-071 Swedish 144958-101 Portuguese 144958-131 Dutch 144958-331

---------------------------------------------------------------------------

Manual - MS-DOS GUIDE, 6.0 and MS Windows

English 195973-001 German 195973-041 French 195973-051 Italian 195973-061 Spanish 195973-071

Danish 195973-081 Norwegian 195973-091 Swedish 195973-101 Portuguese 195973-131 Dutch 195973-331 Finnish 195973-351

---------------------------------------------------------------------------

Manual - LOTUS ORGANIZER

English 137885-001 German 137885-041 French 137885-051 Italian 137885-061 Spanish 137885-071 Danish 137885-081 Norwegian 137885-091 Swedish 137885-101 Dutch 137885-331 Finnish 137885-351

---------------------------------------------------------------------------

COMPAQ SERVICE QUICK REFERENCE GUIDE 106854-001

---------------------------------------------------------------------------

ROMPaq diskette 181088-001 ===========================================================================

Chapter 2. Preparing the Computer for Service

Introduction

This chapter provides general service information necessary to prepare the computer for service in the following areas:

o Electrostatic discharge

o Service preliminaries

o Battery disposal

Adherence to the procedures and precautions described in this chapter is essential for proper service.

Chapter 2.1 Electrostatic Discharge

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Static electricity can damage electronic components. Before beginning these procedures, make sure you are grounded (discharged of static electricity) by briefly touching a grounded, unpainted, metal object or surface.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

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

This section details methods of generating, preventing, and grounding static electricity.

Generating Static

Table 2-1 shows how different activities generate static electricity and at different electrostatic voltage levels.

Table 2-1. Typical Electrostatic Voltages ===========================================================================

Relative Humidity 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. ===========================================================================

Preventing Electrostatic Damage to Equipment

Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of sensitivity. The following proper packaging and grounding precautions are necessary to prevent damage:

o Protect all electrostatic parts and assemblies with conductive or

approved containers or packaging.

o Keep electrostatic sensitive parts in their containers until they arrive

at static-free stations.

o Place items on a grounded surface before removing them from their

container.

o Always be properly grounded when touching a sensitive component or

assembly.

o Place reusable electronic-sensitive parts from assemblies in protective

packaging or conductive foam.

Use transporters and conveyors made of anti-static belts and metal roller bushings. Mechanized equipment used for moving materials must be wired to ground and proper materials selected to avoid static charging. When grounding is not possible, use an ionizer to dissipate electric charges.

Preventing Damage to Drives

To prevent static damage to hard drives, use the following precautions:

o Handle drives gently, using static-guarding techniques.

o Store drives in the original shipping containers.

o Avoid dropping drives from any height onto any surface.

o Handle drives on surfaces that have at least one inch of shock proof

foam.

o Always place drives PCB assembly side down on the foam.

Grounding Methods

The method for grounding must include a wrist strap or a foot strap at a grounded workstation. When seated, wear a wrist strap connected to a grounded system. When standing, use footstraps and a grounded floor mat.

Table 2-2. Static-Shielding Protection Levels =========================================================================== Method Voltages =========================================================================== Anti-static Plastic 1,500

Carbon-Loaded Plastic 7,500

Metallized Laminate 15,000 ===========================================================================

Grounding Workstations

To prevent static damage at the workstation, follow these precautions:

o Cover the workstation with approved static-dissipative material.

Provide a wrist strap connected to the work surface and properly grounded tools and equipment.

o Use static-dissipative mats, heel straps, or air ionizers to give added

protection.

o Handle electrostatic sensitive components, parts, and assemblies by the

case or PCB laminate. Handle them only at static-free workstations.

o Avoid contact with pins, leads, or circuitry.

o Turn off power and input signals before inserting and removing

connectors or test equipment.

o Use fixtures made of static-safe materials when fixtures must directly

contact dissipative surfaces.

o Keep work area free of nonconductive materials such as ordinary plastic

assembly aids and Styrofoam.

Grounding Equipment

Use the following equipment to prevent static electricity damage to the equipment:

Wrist Straps are flexible straps with a minimum of 1 megohm +/-10% resistance to the ground cords. To provide proper ground, a strap must be worn snug against the skin. On grounded mats without banana-plug connectors, connect a wrist strap with alligator clips.

Heelstraps/Toestraps/Bootstraps can be used at standing workstations and are compatible with most types of boots and shoes. On conductive floors or

dissipative floor mats, use straps on both feet with a minimum of 1 megohm of resistance between operator and ground. To be effective, the conductive strips must be worn in contact with the skin.

Field service tools, such as cutters, screwdrivers, vacuums, that are conductive.

Portable field service kit with a static dissipative vinyl pouch that folds out of a work mat. Also use a wrist strap and a ground cord for the work surface. Ground the cord to the chassis of the equipment undergoing test or repair.

Recommended Materials and Equipment

Other materials and equipment that are recommended for use in preventing static electricity include:

o Anti-static tape

o Anti-static smocks, aprons, or sleeve protectors

o Conductive bins, and other assembly or soldering aids

o Conductive foam

o Conductive table-top workstations with ground cord of 1 megohm of

resistance

o Static dissipative table or floor mats with hard tie to ground

o Field service kits

o Static awareness labels

o Wrist straps and footwear straps providing 1 megohm +/- 10% resistance

o Material handling packages

o Conductive plastic bags

o Conductive plastic tubes

o Conductive tote boxes

o Metal tote boxes

o Opaque shielding bags

o Transparent metallized shielding bags

o Transparent shielding tubes

Chapter 2.2 Service Preliminaries

Some of the service preliminaries that should be kept in mind during the disassembly and assembly of the computer include:

o Tool requirements

o Screws

o Cable and connectors

o Plastics

Tool Requirements

o Flat-bladed screwdriver

o Torx T8 screwdriver (included in 130619-001)

o Hex socket driver (3/16)

o 25-Pin printer loopback plug (included in 100767-001)

o 9-Pin serial loopback plug (included in 100767-001)

o Trackball removal tool (spare part number 147779-001)

o Case Utility tool (spare part number 119070-001 and included in

100767-001))

o Preloaded application diskettes (Compaq Order Center, 1-800-952-7689)

Cables and Connectors

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Most cables used throughout the unit are flex cables. These 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 or pull tabs whenever possible. In all cases, avoid bending, twisting, or tearing the cables, and ensure that cables are placed in such a way that they cannot be caught or snagged by parts being removed or replaced.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Display

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Excess flexing and bending of the shield tabs and fingers can damage the shield.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Keyboard

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

The computer becomes top heavy when the keyboard assembly is removed and the display is opened. To prevent damage to the display and the computer, ensure that the display assembly is opened at a 90-degree angle.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Memory Expansion Board

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

To prevent damage to the memory expansion board, do not apply pressure to the middle of the board. Press only in the area directly over each connector.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Plastics

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

The plastics can be damaged by applying excessive force during disassembly and reassembly. When handling the plastic cases and housing assemblies, use care. Do not use screwdrivers or similar tools to pry apart plastics. Where necessary, use the Case Utility tool (spare part number 119070-001). Proper handling of this tool is illustrated in the disassembly and reassembly procedures.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Screws

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

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

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Real-Time Clock Battery

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Do not touch the bottom of the battery during replacement.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Chapter 2.3 Disposal of a Used Battery

Battery components are considered environmentally harmful. Disposal of a Nickel Metal Hydride (NiMH) Battery Pack should comply with country,

state, province, or local regulations. Whenever possible, recycle the battery components.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> WARNING <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

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.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> WARNING <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

There is a danger of explosion and risk of personal injury if the battery is incorrectly replaced or mistreated. Do not attempt to recharge the battery, disassemble it, or immerse it in water or dispose of it in fire. Replacement is to be done by Authorized Compaq Service Provider using the Compaq spare designated for this product.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Compaq offers its portable product customers in North America an environmentally sound method for disposing of depleted Compaq rechargeable battery packs used in Compaq laptop and subnotebook personal computers.

In the interest of our customers and the protection of our environment, Compaq has initiated a disposal/recycling program for these battery packs. Further, because Compaq is funding all costs associated with the program, it is offered at no cost to Compaq laptop and notebook customers.

IMPORTANT: Toll-Free Number (U. S.) 1-800-524-9859, (Canada)

1-800-263-5868

Customers in North America can take advantage of this program immediately. To safely dispose of a depleted Compaq rechargeable battery pack, follow these steps:

1. Call the Compaq toll-free telephone number. A recorded message asks you

to provide your name, mailing address, and information about the battery pack. Within approximately two to three weeks, Compaq will send a postage-paid "battery mailer" envelope preaddressed to the reclamation facility.

2. Place the Compaq rechargeable battery pack into the battery mailer.

3. Mail it to the Compaq address shown on the mailer.

NOTE: Do not return Compaq rechargeable battery packs to authorized Compaq

service providers (except in the case of service or warranty exchanges) nor to any Compaq address other than the address on the preaddressed battery mailer envelope.

Chapter 3. Removal and Replacement Procedures

Introduction

This chapter provides complete removal and replacement procedures for the Compaq Contura 400 Family of Personal Computers. Procedures that apply to specific models are indicated in parenthesis.

After completing removal and replacement procedures, run the diagnostics program to verify that all components operate properly.

For replacement procedures, follow the removal procedures in reverse order unless otherwise specified.

Chapter 3.1 Disassembly/Assembly Sequence Chart

This chart shows the order in which disassembly procedures are provided:

| |-- Handle | |-- 3.31 MONITOR SUPPORT COVER

Chapter 3.2 Preparing the Computer

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> WARNING <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> WARNING <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Ensure that the power cord is disconnected from the electrical outlet and that the battery pack is removed from the computer before beginning replacement procedures. Failure to disconnect power could result in serious injury or damage to the equipment.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Before beginning the removal and replacement procedures, follow these steps to disconnect all power to the computer and remove the diskette or PC Card, if installed:

1. Save all files and exit all applications.

2. Turn off the computer by pressing the left Ctrl+Alt keys and power

button.

3. Disconnect all external equipment.

4. Disconnect the AC Adapter from the electrical outlet (Figure 3-1).

5. Disconnect the AC Adapter power cord from the computer (Figure 3-2).

6. Eject the diskette (Figure 3-2) and PC Card, if installed.

7. Open the battery compartment by lifting up the front of the computer [1]

and sliding the battery compartment release button to the right [2]. The battery compartment opens slightly. Lower the compartment [3] (Figure 3-3).

8. Remove the battery pack (Figure 3-4).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Metal objects can damage the battery pack and the connectors inside the compartment. To prevent damage, do not let metal objects touch any of the connectors. Do not place any objects other than the battery pack in the battery compartment.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

9. Close the battery compartment.

Chapter 3.3 Handle Bracket

This procedure is necessary if replacing the handle bracket or if separating the display assembly from the system unit module.

Removing the Handle Bracket

To remove the handle bracket, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

2. Close the computer and turn it top-side down.

3. Move the tilt foot toward the front of the computer, exposing the

handle bracket screw on either side of the computer (Figure 3-5).

4. Using a Torx T8 , remove the screw and washer from each handle bracket.

These screws are not reusable and must be discarded.

5. Remove the handle bracket (Figure 3-6).

6. To install the handle bracket, reverse the previous steps. Discard the

old screws and replace with new screws.

Chapter 3.4 Tilt Feet

This procedure is necessary if replacing the tilt feet or if separating the display assembly from the system unit module.

Removing the Tilt Feet

To remove the tilt feet, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

2. Using a Torx T8 , remove the tilt foot screw (Figure 3-7). Screws from

the tilt feet are not reusable and must be discarded.

3. Remove the tilt foot (Figure 3-7).

4. To install the tilt foot, reverse the previous steps. Discard the old

screws and replace with new screws.

Chapter 3.5 Hard Drive

This section contains removal procedures for the following hard drive components:

o Hard drive compartment cover

o Hard drive

o Hard drive bracket

Removing the Hard Drive Compartment Cover

To remove the hard drive compartment cover, follow these steps:

1. Disconnect all power from the computer and remove the battery pack,

diskette, and PC Card, if installed (Section 3.2).

2. Close the computer and turn it top-side down.

3. Using a Torx T-8 or flat-bladed screwdriver, remove the two screws from

the hard drive compartment cover (Figure 3-8).

NOTE: These two screws also secure the CPU base to the keyboard and

must be removed in order to remove the keyboard and access system components.

4. Use a Case utility tool to remove the hard drive compartment cover

(Figure 3-9).

5. To replace the hard drive compartment cover, reverse the previous steps

making sure to insert the bracket's tab under the plastic edge.

Removing the Hard Drive

1. Remove the hard drive compartment cover. Refer to "Removing the Hard

Drive Compartment Cover" in this section.

2. Remove the hard drive by grasping the hard drive bracket and sliding it

toward the front of the computer [1] (Figure 3-10).

3. Lift the hard drive and bracket [2] up and out of the computer

(Figure 3-10).

4. To replace the hard drive, reverse the previous steps.

Removing the Hard Drive Bracket

1. Remove the hard drive compartment cover. Refer to "Removing the Hard

Drive Compartment Cover" in this section.

2. Remove the hard drive and bracket. Refer to "Removing the Hard Drive"

in this section.

3. Using a Torx T8 , remove the four screws from the hard drive bracket

and separate the bracket from the hard drive (Figure 3-11).

4. To replace the hard drive bracket, reverse the previous steps.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

To prevent damage to the system board connectors, ensure that the hard drive is aligned correctly.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

IMPORTANT: The hard drive bracket has four screw holes, one of which is

elongated and one is small. When replacing the hard drive into the hard drive bracket, replace the screw in the small hole first [1], then insert the second screw into the elongated screw hole [2] (Figure 3-12).

Chapter 3.6 Memory Expansion Board

This section contains removal and replacement procedures for the memory compartment cover and the memory expansion board.

The memory compartment cover and the bottom of the CPU base are embossed with arrows and two icons that indicate whether the memory compartment cover is unlocked [1] or locked [2].

Removing and Replacing the Memory Compartment Cover

To remove the memory compartment cover, follow these steps:

1. Disconnect all power from the computer and remove the battery pack,

diskette, and PC Card, if installed (Section 3.2).

2. Close the computer and turn it top-side down.

3. Slide the memory compartment cover toward the rear of the computer and

lift up (Figure 3-14).

IMPORTANT: Be sure to maintain the same orientation of the cover to the

computer when removing and replacing.

4. To replace the memory compartment cover, reverse the previous steps.

Removing the Memory Expansion Board

To remove the memory expansion board, follow these steps:

1. Remove the memory compartment cover. Refer to "Removing and Replacing

the Memory Compartment Cover" in this section.

2. Gently rock the memory expansion board back and forth, disconnecting

the board from both connectors (Figure 3-15).

Replacing the Memory Expansion Board

To replace the memory expansion board, follow these steps:

1. Align the two connectors on the memory expansion board with the

corresponding connectors on the system board.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

To prevent damage to the memory expansion board, do not apply pressure to the middle of the board. Press only in the area directly over each connector.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Insert the memory expansion board into the compartment and press the

memory expansion board down. Apply pressure directly over each connector. Ensure that both connectors snap into place (Figure 3-16).

3. Replace the memory compartment cover. Refer to " Removing and Replacing

the Memory Compartment Cover" in this section.

Chapter 3.7 Keyboard Assembly

This section contains removal and replacement procedures for the following the keyboard assembly components:

o CPU cover

o Keyboard

o Top PC Card door and spring

NOTE: The bottom PC Card door and spring are part of the CPU base.

Removing the Keyboard Assembly

To remove the keyboard assembly, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

2. Close the computer and turn it top-side down.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Screws in the computer are not interchangeable. As you remove screws, place them with the components you removed. Damage may occur if you insert the screws in the wrong place.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

3. Using a Torx T-8 or flat-bladed screwdriver, remove the five screws

from the bottom of the computer and two screws from the hard drive compartment cover (Figure 3-17).

4. Use a case utility tool to remove the hard drive compartment cover

(Figure 3-18).

5. Carefully, turn the computer top-side up and open the display to its

fully opened position (135-degree angle) (Figure 3-19).

6. Using the case utility tool, lift up the outside rear corners of the

keyboard assembly to release the keyboard snaps [1], and tilt the keyboard assembly toward you to release the keyboard connector [2] (Figure 3-20).

IMPORTANT: When using the case utility tool, use care to keep it out of

the diskette drive area.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

The computer becomes top heavy when the keyboard assembly is removed and the display is opened. To prevent damage to the display and the computer, be sure to support the computer when opening the display.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

7. Remove the keyboard assembly by lifting it up [1] and off the front of

the computer [2] (Figure 3-21).

8. Position the display to a 90-degree angle (Figure 3-22).

Removing the CPU Cover

To remove the CPU cover for replacement, follow these steps.

1. Remove the keyboard assembly from the computer. Refer to "Removing the

Keyboard Assembly" in this section.

2. Turn the keyboard assembly top-side down.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Note the position of the screws removed from the bottom of the keyboard assembly. The remaining screws holes are for the screws that go through the keyboard assembly to the CPU base.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

3. Using a Torx T-8 or flat-bladed screwdriver, remove the seven screws on

the bottom of the keyboard assembly (Figure 3-23).

IMPORTANT: Some computers will have a light director located in the status

panel. When removing the CPU cover from the keyboard, the light director will come loose. Be sure to replace the light director in the status panel when replacing the CPU cover to the keyboard.

4. Separate the CPU cover from the keyboard (Figure 3-23).

5. To replace the CPU cover, reverse the previous steps.

Removing the Top PC Card (PCMCIA) Door and Spring

To remove the top PC Card door and spring from the keyboard assembly, follow these steps:

1. Remove the keyboard assembly from the computer. Refer to "Removing the

Keyboard Assembly" in this section.

2. Turn the keyboard assembly top-side down.

3. Remove the PC Card door from the keyboard assembly, unsnap the PC Card

door [1] from the posts, and remove the door (Figure 3-24).

4. Remove the spring [2] from the PC Card door (Figure 3-24).

Replacing the Top PC Card (PCMCIA) Door and Spring

To replace the top PC Card Door and Spring to the keyboard assembly, follow these steps:

1. Install the PC Card spring on the door post, ensuring that the bent arm

of the spring is placed against the rib on the PC Card door (Figure 3-25).

2. Install the PC Card (PCMCIA) door, ensuring that the spring is placed

between the post [1] and the rib [2] (Figure 3-26).

Replacing the Keyboard Assembly

If installing a new keyboard assembly, the hook and loop fastener will have to be attached to the diskette drive bracket:

To attach the hook and loop fastener to the diskette drive bracket, follow these steps:

1. Separate the new hook and loop fastener.

2. Attach the opposite color of the hook and loop fastener to the existing

hook and loop fastener on the tab on the diskette drive bracket [1] (Figure 3-27).

3. Remove the top layer from the hook and loop fastener to expose the

adhesive strip prior to replacing the keyboard assembly [2] (Figure 3-27).

To replace the existing keyboard assembly in the computer, follow these steps:

1. Open the display to its fully opened position of 135-degrees

(Figure 3-28).

2. Angle the front end of the keyboard assembly into place at the front

edge of the system unit module.

3. Ensure that the front plastic seams of the keyboard assembly and the

front of the system unit module are aligned and flush with each other.

4. Carefully lower the rear of the keyboard assembly to the system unit

module and press the outside rear corners until the keyboard assembly snaps into place.

5. Verify the alignment of the keyboard assembly to the computer base.

Check the seams between the front and side edges of the computer base and the keyboard assembly. If the seam is uneven, remove the keyboard assembly and correctly align the tabs and recesses.

6. Press firmly in the center of the keyboard assembly below the status

panel [1] to connect the keyboard connector [2] to the system board [3] (Figure 3-29).

Chapter 3.8 Battery Compartment Components

This section contains removal procedures for the following battery compartment components:

o Battery compartment

o Anti-skid pad

o Battery release button spring

o Battery release button

Removing the Battery Compartment

To remove the battery compartment components, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

2. Turn the computer top-side down.

3. Gently squeeze in the sides of the compartment, rocking it back and

forth, then lifting it up from the bottom of the base (Figure 3-30).

4. To replace the battery compartment, reverse the previous steps.

Attaching the Anti-Skid Pads

If installing a new battery compartment, two anti-skid pads must be attached to the bottom of the battery compartment. To attach the anti-skid pads, follow these steps:

1. Peel off the top layer of one of the anti-skid pads to expose the

adhesive.

2. With the adhesive-side down, place the anti-skid pad into the raised

oval outline on the battery compartment (Figure 3-31).

Removing the Battery Release Spring and Button

To remove the battery release spring and button, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. From the battery enclosure, remove the battery release button spring by

unhooking the spring from the post on the CPU base [1], then releasing it from the hook on the battery release button [2] (Figure 3-32).

4. Rotate the battery release button counterclockwise, until it bows

slightly, and lift it up to clear the hook on the computer base (Figure 3-33).

5. To replace the battery release button and spring, reverse the previous

steps.

Chapter 3.9 Real-Time Clock Battery (Models 400 and 410)

To remove the real-time clock battery, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. Remove the real-time clock battery from the system board by inserting a

non conductive probe into the battery holder and pushing back on the battery to release it (Figure 3-34).

NOTE: Refer to Chapter 2 "Preparing the Computer for Service" for battery

disposal procedures.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Do not touch the bottom of the battery during replacement.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

4. To replace the real-time clock battery, reverse the previous steps.

Chapter 3.10 Real-Time Clock Battery (Models 420 and 430)

To remove the real-time clock battery, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. Remove the real-time clock battery from the system board by inserting a

non conductive probe into the battery holder and pushing back on the battery to release it (Figure 3-35).

NOTE: Refer to Chapter 2 "Preparing the Computer for Service" for battery

disposal procedures.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Do not touch the bottom of the battery during replacement.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

4. To replace the real-time clock battery, reverse the previous steps.

Chapter 3.11 Processor Upgrade Option (Model 400 Only)

This section provides installation and replacement procedures for the processor upgrade. The Compaq Contura 400 is the only model with the DX2/40 MHz Processor that can be upgraded to a DX2/50 MHz processor. Once the processor is installed, the upgraded processor overrides control of the processor on the system board. You do not have to remove the system board processor.

NOTE: Use only the DX2/50 MHz processor in the upgrade option slot.

To install the processor upgrade option, do the following:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. Disconnect the processor board from the two connectors on the system

board (Figure 3-36).

4. To remove the processor upgrade, reverse the previous steps.

Chapter 3.12 Integrated Mechanical Trackball Assembly (Models 400 and 410)

IMPORTANT: The mechanical trackball assembly is not interchangeable with

the optical trackball assembly in Models 420 and 430.

To remove the integrated mechanical trackball assembly, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. Using a Torx T-8 or flat-bladed screwdriver, remove the screw from the

front right-hand corner of the integrated mechanical trackball assembly (Figure 3-37).

4. Disconnect the integrated mechanical trackball assembly from the system

board by pulling forward on the integrated mechanical trackball assembly until it stops.

5. Tilt up the front of the integrated mechanical trackball assembly and

lift it up to clear the connectors and the system board (Figure 3-38).

6. To replace the integrated mechanical trackball assembly, reverse the

previous steps.

Trackball Cleaning Procedures

1. Turn off the computer by pressing the left Ctrl+Alt keys and the power button. Disconnect the AC power and remove the battery pack.

2. Loosen the trackball retaining ring by placing the trackball tool over the retaining ring and turning the tool counterclockwise one quarter turn.

3. Carefully remove the retaining ring. This is a delicate part and repetitious handling of this piece may cause it to tear.

4. Remove the ball from its cage by gently lifting the computer and turning it over so that the ball falls into your hand.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Do not soak components, and do not use any solvents other than isopropyl (rubbing) alcohol!

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5. Clean the trackball with isopropyl (rubbing) alcohol only. Dry it with a clean, lint-free cloth. DO NOT USE AN ABRASIVE CLEANER.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

If a foam-tipped swap is not available, you can use a cotton swab. But use a cotton swap only once and then discard it as it may scratch the trackball.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

6. Gently wipe the cage to remove residue from the surface. Clean the ball bearings by rubbing with the swab. Do not attempt to remove the bearings. Next, gently swab the rollers from side to side until all buildup is removed. Rotate rollers to ensure that all surfaces are cleaned.

7. Be sure not to leave any cotton fibers on any part of the trackball components. Use tweezers to remove any fibers that may have accumulated on or around the cage, rollers, or support post.

8. Let the unit air dry before reassembling it.

9. To reassemble, place the computer right side up and place the cleaned ball into its cage.

10. Gently replace the retaining ring by aligning the notches; then use the trackball tool to turn it clockwise one quarter turn until it locks into place.

11. Use the trackball to verify that it works properly without skipping or sticking.

Chapter 3.13 Integrated Optical Trackball Assembly (Models 420 and 430)

IMPORTANT: The optical trackball assembly is not interchangeable with the

mechanical trackball assembly in Models 400 and 410.

To remove the integrated optical trackball assembly, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. Using a Torx T-8 or flat-bladed screwdriver, remove the screw from the

front right-hand corner and the left rear corner of the trackball assembly (Figure 3-39).

4. Disconnect the integrated optical trackball assembly from the system

board by pulling upward on the trackball assembly.

5. To replace the integrated mechanical trackball assembly, reverse the

previous steps.

Trackball Cleaning Procedures

1. Turn off the computer, disconnect AC power, and remove the battery pack.

2. Remove the Integrated trackball.

3. Remove any large particles of debris that have fallen into the

trackball housing.

4. Dip a cotton swab in isopropyl alcohol and squeeze off excess liquid.

5. Carefully wipe inside the cage to remove residue from surfaces. Clean

the ball bearings by rubbing with the swab. Do not attempt to remove the bearings. Do not use alcohol on the sensor window. Instead, gently wipe the sensor window with a soft, dry, lint-free cloth until all debris is removed. Allow enough time for the parts to air dry before reassembling.

6. Replace the ball and gently secure the retaining ring by rotating it

clockwise.

7. Replace the battery pack and reconnect the AC power.

Chapter 3.14 Diskette Drive (All Models)

This section contains removal and replacement procedures for the following diskette drive components:

o Diskette Drive

o Diskette Drive Bracket

o Diskette Drive Insulator Strip

Removing the Diskette Drive

To remove the diskette drive, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and

battery pack (Section 3.2).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

2. Remove the keyboard assembly (Section 3.7).

3. Disconnect the diskette drive cable from the LIF connectors on the

diskette drive and the system board (Figure 3-41).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

Screws in the computer are not interchangeable. As you remove screws, place them with the components you removed. Damage may occur if you insert the screws in the wrong place.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

4. Using a Torx T-8 or flat-bladed screwdriver, remove the three diskette

drive bracket screws that screw into the system board (Figure 3-42).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

When removing or replacing the diskette drive, hold it by grasping the vertical sides. Pressure to the front drive door area of the diskette drive will cause the drive door to pop out from the mounting.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

5. Tilt up the diskette drive bracket, then lift it up and out of the

system chassis (Figure 3-43).

Removing the Diskette Drive from the Diskette Drive Bracket

1. Remove the diskette drive from the system chassis. Refer to "Removing

the Diskette Drive" in this section.

2. Remove the diskette drive from the bracket by removing the four screws

from both sides of the bracket (Figure 3-44).

3. Separate the diskette drive from the bracket (Figure 3-45).

4. To replace the diskette drive into the bracket, reverse the previous

steps.

Applying the Diskette Drive Hook and Loop Fastener

If installing a new diskette drive bracket, the hook and loop fastener must be attached to the bracket.

To attach the hook and loop fastener, follow these steps:

1. Separate the new hook and loop fastener.

2. Remove the backing from the adhesive on the hook and loop fastener that

is the opposite color of the hook and loop fastener attached to the keyboard assembly (for example, white to black or black to white).

3. Attach the new hook and loop fastener of the opposite color of the hook

and loop fastener on the keyboard assembly to the tab on the diskette drive bracket (Figure 3-46).

Replacing the Diskette Drive

To replace the diskette drive into the system chassis, follow these steps:

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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

1. Replace the diskette drive into the diskette drive bracket. Use the

four screws to secure the diskette drive to the bracket.

2. Tow in the back end of the diskette drive into the system chassis.

IMPORTANT: Ensure that the diskette drive door does not catch on the

outside edge of the system unit module.

3. Close the diskette drive door slightly while lowering the front of the

diskette drive into the system chassis (Figure 3-47).

4. Reconnect the Diskette Drive Cable and reinstall the three screws.

Chapter 3.15 The System Board (All Models)

To remove the system board, follow these steps:

1. Disconnect all power from the computer and remove the AC Adapter and battery pack (Section 3.2).

2. Remove the hard drive (Section 3.5).

3. Remove the memory expansion board, if installed (Section 3.6).

4. On the rear of the computer, use a hex socket driver to remove the six screw locks (Figure 3-48).

5. Using a Torx-T8 driver, remove the two alignment screws from the docking base connector (Figure 3-48).

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>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

6. Remove the keyboard assembly (Section 3.7).

7. Remove the processor upgrade, if installed (Section 3.11).

8. Remove the integrated trackball assembly (Section 3.12 for Models 400 and 410 and Section 3.13 for Models 420 and 430).

9. Remove the diskette drive (Section 3.14).

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> CAUTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

The ZIF connector and its attached cable can be damaged easily. Handle only the connector slide when disconnecting the ZIF connector. Never pull or twist the cable itself while it is seated in the ZIF connector.

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Compaq DX4-100, DX4-75, DX2-50, DX2-40 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Illustrated Parts Catalog

Chapter 2. Preparing the Computer for Service

Chapter 3. Removal and Replacement Procedures