HP CONTURA AERO Manual

5 (1)

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.

Compaq, Deskpro, LTE, Contura

Registered U.S. Patent and Trademark Office.

Contura Aero is a trademark of Compaq Computer Corporation.

The software described in this guide is furnished under a license agreement or nondisclosure agreement. The software may be used or copied only in accordance with the terms of the agreement.

Product names mentioned herein may be trademarks and/or registered trademarks of their respective companies.

MAINTENANCE AND SERVICE GUIDE

Compaq Contura Aero Family of Personal Computers

First Edition (February 1994)

Part Number 197235-001

Preface

This Maintenance and Service Guide is used for reference when servicing the Compaq Contura Aero Family of Personal Computers. Additional information is available in the following publications:

o Compaq Contura Aero 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

Compaq Computer Corporation reserves the right to make changes to the Compaq Contura Aero 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 in the warning could result in bodily harm or loss of life.

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

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

Text set off in this manner indicates that failure to follow directions could result in damage to equipment or loss of data.

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

IMPORTANT: Text set off in this manner presents clarifying information or specific instructions.

NOTE: Text set off in this manner presents commentary, sidelights, or interesting points of information.

Technician Notes

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

Only authorized technicians trained by Compaq should repair this equipment. All troubleshooting and repair procedures are detailed to allow only subassembly/module level repair. Because of the complexity of the individual boards and subassemblies, 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.

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

Chapter 1. Illustrated Parts Catalog

Chapter 1.0 Introduction

Chapter 1.1 Illustrated Parts Breakdown: Compaq Contura Aero Family Of Personal Computers

The Compaq Contura Aero Family of Personal Computers joins a display assembly and system unit together with a clutch secured by screws in the chassis, display enclosure, and a display pin allowing it to open and close. The display assembly is secured by screws installed in the front of the display enclosure. The system unit is secured to the system unit enclosure by screwlocks in the rear and screws in the bottom of the system unit enclosure.

SYSTEM UNIT MODULE DESCRIPTION

The system unit (Figure 1-4) includes the following replaceable parts:

o Battery and spacer o Base enclosure

o Keyboard

o Hard drive

o Power supply

o PCMCIA ejector rails o Trackball assembly

o Memory expansion board (optional) o System board

The keyboard is secured to the system unit with four screws and a hook latch in the front. Once the screws are removed, the keyboard must be rotated from the rear forward to disengage it from the hook latch. The keyboard must be removed to allow access to any of the system board components. The keyboard is connected to the system board with two ribbon cables and zero insertion force (ZIF) connectors. The cables do not necessarily have to be disconnected to service the system board. The keyboard may be laid on top of the battery compartment to access the system board.

The	hard	drive	is connected directly				to the system board		with no
intervening cables. It				is	mounted	to	the	chassis with a hard drive bracket.
The	hard	drive	bracket	is	secured	to	the	hard drive with	three screws.

The power supply is secured to the system board with one threaded standoff. There is no cable between the power supply and the system board; the power supply connects directly to the system board.

The trackball assembly consists of the trackball, buttons, flex cable, and speaker. The trackball plugs directly into the cable with a low insertion force (LIF) connector and mounts with two screws in the right front corner of the base enclosure. The flex cable includes the buttons and speaker. The buttons fit in a recessed area on the right side of the base enclosure and control the functions of the trackball. The speaker is connected to the flex cable with two wires and fits in a narrow area in the right front corner of the base enclosure. Sound is directed through the enclosure. The remainder of the flex cable is routed behind and over the hard drive assembly and plugs with a LIF connector directly into the system board.

The system board is mounted directly to the chassis. All system module components connected to the system board must be removed prior to removing the system board.

The PCMCIA rails are secured to the system board header with two screws at the top. The rails plug directly into the system board connector.

The memory expansion board plugs into the system board in the bottom of the base enclosure. Remove the door, and the memory expansion board plugs into a single connector. System memory can be increased to a maximum 12 MB by adding an 8 MB Memory Expansion Board. A 4 MB Memory Expansion Board is also available.

DISPLAY ASSEMBLY MODULE DESCRIPTION

The display assembly (Figures 1-5 and 1-6) includes the following replaceable parts:

o Display bezel

o Liquid crystal display (LCD) panel o Display inverter board

o Display cable o Display shield

o Display enclosure

Compaq Contura Aero 4/25

The display assembly is secured with two screws in the bottom corners of the display bezel and by a screw in a clutch and a pin to the base enclosure. To remove the display assembly from the base enclosure, the display bezel must be removed first. Then the CPU cover is removed to allow access to the system board.

The monochrome LCD is secured to the display enclosure with two screws in the top left corner and one screw in the top right corner. The bottom right corner has two small cables attached to a connector for the backlight and the inverter board.

The display cable is a flex cable plugged into a connector on the left side of the LCD, folded, and secured to the display shield with a pressure sensitive adhesive. One end of the display cable is exposed at the bottom of the display enclosure and is connected to the system board with a zero insertion force (ZIF) slider. The other end is connected with a low insertion force (LIF) connector to the display inverter board.

The display inverter board is aligned in the bottom of the display enclosure with pins. One end connects to the display cable; the other end plugs into the backlight cable of the LCD panel and is held in place with pressure sensitive adhesive tape.

The display shield lays in the display enclosure.

Compaq Contura Aero 4/33C

The color LCD is secured to the display enclosure with four screws in the corners of the LCD panel. The top right corner has two small cables attached to a connector for the backlight and the inverter board.

The display cable is a flex cable plugged into a ZIF connector on the left side of the LCD, folded, and secured to the display shield with a pressure sensitive adhesive. One end of the display cable is exposed at the bottom of the display enclosure and is connected to the system board with a ZIF connector. The other end plugs into a LIF connector on the display inverter board in the lower right hand corner of the display enclosure.

The display inverter board is aligned on the right side of the display enclosure and mounted component side down. One end connects to the display cable; the other end plugs into the backlight cable of the LCD panel.

The display shield lays in the display enclosure and has tabs that bend over the screw holes of the LCD and secure the display shield to the LCD.

Chapter 1.2 System Unit Module

Table 1-1. System Unit

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

Description Spare Part No. Notes

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

1 Base enclosure 197253-001 Includes screw covers.

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

2 System board, 4 MB			Does not	include PCMCIA ejector
			rails.
Compaq	Contura	197241-001	Includes	screw covers.
Aero 4/25
Compaq	Contura	199222-001

Aero 4/33C

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

3 Door assembly	197239-001	Includes battery and memory
		expansion board doors.

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

4 Power supply, DC-DC 190521-001 Includes screw covers.

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

5 Hard drive
- Model 250			199233-001	Does not include hard drive
-	Model	170	190661-001	bracket. Includes screw covers.
-	Model	84	190660-001

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

6Memory expansion board

-	4	MB	190565-001
-	8	MB	190596-001

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

7 Real time clock

117099-001

battery

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

8 NiMH Battery Pack
- 8A: Extended Life		190626-001	Extended Life battery does not
-	8B: Standard	190697-001	include spacer. Standard battery
-	8C: Spacer	197317-001	includes spacer.

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

9 Trackball cable and	197312-001	Includes screw covers.
speaker assembly

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

10 Trackball assembly 197286-001 Includes screw covers.

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

11 Hard drive bracket	197236-001	Includes screws and screw
		covers.

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

12 System ROM 197229-001 Includes screw covers.

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

13 CPU cover 197311-001 Includes screw covers.

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

14 CPU chassis 199276-001 Includes clip and screw covers.

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

Chapter 1.3 VGA Display

Table 1-2. Compaq Contura Aero 4/25 Monochrome VGA Display

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

Description Spare Part No. Notes

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

1 Display enclosure	197237-001	Includes enclosure, clutch, pin,
kit		latch, spring, screws,	display
		shield, slotted bushing, ground
		clip, screw covers and	logo.

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

2 Display panel 190624-001 Includes labels, screw covers.

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

3 Display bezel 197344-001 Includes screw covers.

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

4 Backlight inverter	190522-001	Includes adhesive tape, screw
board		covers.

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

5 Display cable	197238-001	Includes ZIF slider and screw
		covers.

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

6 Display hardware *	197316-001	Includes screws, ground clip,
		and screw covers.

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

* Not Shown

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

Table 1-3. Compaq Contura Aero 4/33C Color VGA Display

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

Description Spare Part No. Notes

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

1 Display enclosure	199257-001	Includes enclosure, clutch, pin,
kit		latch,	spring, screws, display
		shield, slotted bushing, screw
		covers	and logo.

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

2 Display panel 199232-001 Includes labels, screw covers.

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

3 Display bezel 199260-001 Includes screw covers.

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

4 Backlight inverter 199223-001 Includes screw covers. board

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

5 Display cable	199258-001	Includes ZIF slider and screw
		covers.

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

6 Display hardware *	197316-001	Includes screws and screw
		covers.

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

* Not Shown

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

Chapter 1.4 Keyboards

Table 1-4. Notebook Keyboards

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

Description Spare Part Number

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

1	U.S.	190620-001
2	U.K.	190620-003 *
3	German	190620-004 *
4	French	190620-005 *
5	Italian	190620-006 *
6	Spanish	190620-007 *
7	Danish	190620-008 *
8	Norwegian	190620-009 *
9	Swedish/Finnish	190620-010 *
10	Swiss	190620-011 *
11	French Canadian	190620-012 *
12	Portuguese	190620-013 *
13	Latin American	190620-016	*
14	Belgium	190620-018	*
15	Japanese	190620-019	*

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

* Not Shown

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

Table 1-5. Enhanced Keyboards

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

Description Spare Part Number

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

1	Enhanced II Keyboard U.S.	112573-001 (No longer
		available)*
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 *

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

*Not Shown

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

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

Chapter 1.5 Cables

Table 1-6. Cables

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

Description Spare Part Number

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

1	Display	Cable	(Compaq Contura Aero 4/25)	197238-001
2	Trackball/Speaker Cable			197312-001
3	Communication		Cable	197318-001
4	Display	Cable	(Compaq Contura Aero 4/33C)	199258-001

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

Chapter 1.6 AC Adapter And Power Cord

Table 1-7. AC Adapter and Power Cord

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

Description Spare Part Number

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

1	AC Adapter		190621-001
2	Power Cord	(U.S./Canada)	197230-001
3	Power Cord	(U.K.)	197232-001 *
4	Power Cord	(Europe)	197231-001 *
5	Power Cord	(Japan)	197233-001	*
6	Power Cord	(Asia Pacific)	197234-001	*

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

* Not shown

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

Table 1-8. Documentation and Software

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

Description Spare Part Number

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

MAINTENANCE AND SERVICE GUIDE

197235-001

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

QUICK SETUP CARD, BEYOND SETUP

English	197243-001
German	197243-041
French	197243-051
Italian	197243-061
Spanish	197243-071

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

COMPAQ SERVICE QUICK REFERENCE GUIDE

106854-001

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

LOTUS ORGANIZER MANUAL

English	137885-001
German	137885-041
French	137885-051
Italian	137885-061
Spanish	137885-071

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

Online USER'S GUIDE

English	190512-001
German	190512-041
French	190512-051
Italian	190512-061
Spanish	190512-071

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

WINLINK (diskettes)

English	197330-001
German	197330-041
French	197330-051
Italian	197330-061
Spanish	197330-071

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

Table 1-9. Accessories

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

Description Spare Part Number

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

Automobile adapter		190551-001
Memory	expansion board
4 MB		190565-001
8 MB		190596-001
Base unit		190568-001
PCMCIA	external diskette drive	190563-001
Mobile	port expander	197364-001
Carrying case		121423-001
Briefcase		129930-001
Slipcase cover		197242-001

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

Table 1-10. Mounting Hardware

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

Description Spare Part Number

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

Kit,	CPU base screws and screwlocks	197315-001
Kit,	display screws	197316-001
Trackball removal tool		194041-001

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

Table 1-11a. Fastener List for CPU Base Screws and Screwlocks

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

Description Type Where Used Part Number Drive Qty

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

M2.5 x 7.0 * Hex System board to 139576-004 3/16 2 chassis

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

M2.5 x 3.55 * Hex	Power supply board to	197257-001	3/16	1
	chassis

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

#4-40 * Hex I/O connector 106902-004 3/16 4

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

M3.0 x 3.0	Pan	Hard	drive	bracket to	139574-001	PH/1	3
		hard	drive

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

M2.0 x 7.0	Pan	PCMCIA rails to	144762-002	PH/1	2
		chassis

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

M2.0 x 2.5 Truss Keyboard to chassis 144863-002 T8/SL 3

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

M2.5 x 12.0	Truss Hard drive	to keyboard 144864-005	T8/SL 1
	to chassis

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

M2.5 x 6.0 Truss Clutch, system board 144865-003 T8/SL 7

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

M2.5 x 16.0 Truss Base 144865-005 T8/SL 4

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

* Screwlocks

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

Table 1-11b. Fastener List for the Compaq Contura Aero 4/25 Display

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

Description Type Where Used Part Number Drive Qty

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

M2.0	x 4.0		Truss	Pin	144863-001	T8/SL	2
M2.5	x 4.5		Truss	Clutch	144864-001	T8/SL	2
M2.0	x	6.0	Pan	Bezel	197341-002	PH/1	2
M2.0	x	2.5	Truss	Panel to enclosure	144863-002	T8/SL	3

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

Table 1-11c. Fastener List for the Compaq Contura Aero 4/33C Display

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

Description Type Where Used Part Number Drive Qty

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

M2.0	x 4.0		Truss	Pin and inverter board	144863-001	T8/SL	2
M2.5	x 4.5		Truss	Clutch	144864-001	T8/SL	2
M2.0	x	6.0	Pan	Bezel	197341-002	PH/1	2
M3.0	x	6.0	Truss	Panel to enclosure	198889-001	T8/SL	4

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

Table 1-12. Miscellaneous Kits

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

Description Spare Part Number

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

Base unit tilt feet

197346-001

CPU enclosure feet	197345-001
Battery and memory doors	197239-001
PCMCIA eject rails	197314-001
Carton, quantity 5	137863-001
Carton and buns, quantity 1	137864-001
Display connector slider	140071-001
Plate logo	197251-001
Battery spacer	197317-001

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

Chapter 2. Service Preliminaries

Chapter 2.0 Introduction

This chapter provides general service information for the computer and the base unit.

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

Chapter 2.1 Electrostatic Discharge (International)

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 or 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.

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		35,000V	15,000V	7,500V
Walking across vinyl	floor	12,000V	5,000V	3,000V
Motions of bench worker		6,000V	800V	400V
Removing DIPS from plastic tubes		2,000V	700V	400V
Removing DIPS from vinyl trays		11,500V	4,000V	2,000V
Removing DIPS from styrofoam		14,500V	5,000V	3,500V
Removing bubble pack	from PCBs	26,000V	20,000V	7,000V
Packing PCBs in foam	lined box	21,000V	11,000V	5,000V

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

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 antistatic 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

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

Antistatic	Plastic	1,500
Carbon Loaded Plastic		7,500
Metallized	Laminate	15,000

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

Grounding Workstations

To prevent static damage at the workstation, use the following 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.

o Use field service tools, such as cutters, screwdrivers, vacuums, that are conductive.

o Use a 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.

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

Recommended Materials and Equipment

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

o Antistatic tape

o Antistatic 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

SERVICE CONSIDERATIONS

Listed below are some of the considerations that should be kept in mind during the disassembly and assembly of the computer.

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 Cross recess (Phillips) screwdriver (included in 130619-001)

o Trackball tool (spare part number 194041-001)

o Case utility tool (spare part number 119070-001 and included in 10076-001)

o PCMCIA external diskette drive (part number 190533-001)

o Preloaded application diskettes

Screws

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.

IMPORTANT: As each subassembly is removed from the computer, it should be placed away from the work area to prevent damage.

Cables and Connectors

Most cables used throughout the unit are flex cables (Figures 2-1, 2-2, 2-3). 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 units, ensure that cables are placed in their proper location during the reassembly process. Improper cable placement can cause severe damage to the unit.

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

Plastics

The plastics used can be damaged by application of 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.

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, battery components should be recycled.

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

Never attempt to open or service a battery pack. Opening a battery pack not only damages the pack and makes it unusable, but also exposes potentially harmful battery components.

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

Chapter 2.1 Electrostatic Discharge (U.S. and Canada)

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.

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		35,000V	15,000V	7,500V
Walking across vinyl	floor	12,000V	5,000V	3,000V
Motions of bench worker		6,000V	800V	400V
Removing DIPS from plastic tubes		2,000V	700V	400V
Removing DIPS from vinyl trays		11,500V	4,000V	2,000V
Removing DIPS from styrofoam		14,500V	5,000V	3,500V
Removing bubble pack	from PCBs	26,000V	20,000V	7,000V
Packing PCBs in foam	lined box	21,000V	11,000V	5,000V

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

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.

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

Table 2-2. Static Shielding Protection Levels

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Method Voltages

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Antistatic	Plastic	1,500
Carbon Loaded Plastic		7,500
Metallized	Laminate	15,000

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Grounding Workstations

To prevent static damage at the workstation, use the following 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.

o Use field service tools, such as cutters, screwdrivers, vacuums, that are conductive.

Grounding Equipment

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

Recommended Materials and Equipment

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

o Antistatic tape

o Antistatic 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

SERVICE CONSIDERATIONS

Listed below are some of the considerations that should be kept in mind during the disassembly and assembly of the computer.

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 Cross recess (Phillips) screwdriver (included in 130619-001)

o Trackball tool (spare part number 194041-001)

o Case utility tool (spare part number 119070-001 and included in 10076-001)

o PCMCIA external diskette drive (part number 190533-001)

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

Screws

IMPORTANT: As each subassembly is removed from the computer, it should be placed away from the work area to prevent damage.

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