Dell Latitude C840 User manual

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Dell Latitude C840 Service Manual
Dell™ Latitude™ C840 Service Manual
Before You Begin
Preparing to Work Inside the Computer 
Recommended Tools 
Computer Orientation 
Screw Identification 
System Components
Hard Drive and Fixed Optical Drive
Hard Drive 
Fixed Optical Drive 
System Upgrades
Memory Modules 
Modem Daughter Card 
Mini PCI Card 
Keyboard
Display
Display Overview 
Hinge Cover 
Display Assembly 
Display Bezel 
Display Panel 
Display Latch 
Microprocessor Thermal-Cooling Assembly
Microprocessor Module
Video Graphics Board
Palm Rest
Reserve Battery
System Board
Battery and Module Bay Latches
Battery Charger Board
LED Board
Fan
RJ-11/RJ-45 Module
Pin Assignments for I/O Connectors
Notes, Notices, and Cautions
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Dell Latitude C840 Service Manual

NOTE: A NOTE indicates important information that helps you make better use of your

computer.

NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you

how to avoid the problem.

CAUTION: A CAUTION indicates a potential for property damage, personal injury, or

death.

Information in this document is subject to change without notice.

Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.

Trademarks used in this text: Dell, the DELL logo, and Latitude are trademarks of Dell Computer Corporation; Intel is a

registered trademark of Intel Corporation; Microsoft and Windows are registered trademarks of Microsoft Corporation.

Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and

names or their products. Dell Computer Corporation disclaims any proprietary interest in trademarks and trade names other

than its own.

This product incorporates copyright protection technology that is protected by method claims of certain U.S. patents and

other intellectual property rights owned by Macrovision Corporation and other rights owners. Use of this copyright

protection technology must be authorized by Macrovision Corporation, and is intended for home and other limited viewing

uses only unless otherwise authorized by Macrovision Corporation. Reverse engineering or disassembly is prohibited.

February 2002 Rev. A00

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Before You Begin: Dell Latitude C840 Service Manual

Back to Contents Page

Before You Begin

Dell™ Latitude™ C840 Service Manual

Preparing to Work Inside the Computer

Recommended Tools

Computer Orientation

Screw Identification

Preparing to Work Inside the Computer

CAUTION: Only a certified service technician should perform repairs on your

computer. Damage due to servicing that is not authorized by Dell is not covered by

your warrantly. Read and follow all safety instructions in "Safety and EMC

Instructions: Portable Computers" in your System Information Guide.

NOTICE: To avoid damaging the computer, perform the following steps before you begin

working inside the computer.

1. Ensure that the work surface is flat and clean to prevent scratching the computer cover.

2. Save any work in progress and exit all open programs.

3. Turn off the computer and all attached devices.

NOTE: Before turning off the computer, ensure that the computer is not in a power-

management mode.

4. Ensure that the computer is undocked.

5. Disconnect the computer from the electrical outlet.

6. To avoid possible damage to the system board, wait 10 to 20 seconds and then disconnect any

attached devices.

7. Disconnect all other external cables from the computer.

8. Remove any installed PC Cards or plastic blanks from the PC Card slot.

9. Close the display and turn the computer upside down on a flat work surface.

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Before You Begin: Dell Latitude C840 Service Manual

10. Remove the battery from the battery bay.

NOTICE: To avoid component damage, always remove any installed batteries before you

service the computer.

11. Remove any device installed in the module bay.

12. To dissipate static electricity while you work, periodically touch an unpainted metal surface on

the computer chassis.

13. Handle components and cards by their edges, and avoid touching pins and contacts.

Recommended Tools

The procedures in this document require the following tools:

●#1 magnetized Phillips screwdriver

●Small flat-blade screwdriver

●Microprocessor extractor

●Nonmarring plastic scribe

●Flash BIOS update floppy disk or CD (provided when needed to upgrade the BIOS)

Computer Orientation

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Before You Begin: Dell Latitude C840 Service Manual

Screw Identification

When you are removing and replacing components, photocopy the placemat as a tool to lay out and

keep track of the component screws. The placemat provides the number of screws and the sizes.

Screw Identification

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Before You Begin: Dell Latitude C840 Service Manual

NOTICE: When reinstalling a screw, you must use a screw of the correct diameter and length.

Ensure that the screw is properly aligned with its corresponding hole, and avoid overtightening.

Hard-Drive Door Security:

M3 x 5 mm (1 each)

Keyboard to Bottom Case:

M2.5 x 20 mm (4 each; one in memory

door and one in Mini PCI door)

Display to Bottom Case:

M2.5 x 6 mm (3 each; 2

at back of computer; 1 at

display flex-cable strain

relief)

Display Bezel:

Rubber screw covers (4 each)

Plastic screw covers (2 each)

M2.5 x 4 mm (6 each)

Display Panel to Display Mounting

Bracket:

M2 x 3 mm (6 each)

Flex-Cable Mounting Bracket to Top

Cover:

M2.5 x 4 mm (1 each)

Video Graphics Board:

M2.5 x 8 (3 each)

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Before You Begin: Dell Latitude C840 Service Manual

Palm Rest to

Bottom Case:

M2.5 x 20 mm (9 each)

Palm Rest Bracket:

M2.5 x 4 mm (4 each)

System Board:

M2.5 x 4 mm captive washer

(3 each)

M2.5 x 20 mm (1 each)

LED Board:

M2 x 4 mm (2 each)

Fan:

M2 x 4 mm (3 each)

Memory Module/Modem Cover:

M2.5 x 20 mm (1 each)

Modem Daughter Card:

M2 x 3 mm (1 each)

Mini PCI Card:

M2.5 x 20 mm (1 each)

Back to Contents Page

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System Components: Dell Latitude C840 Service Manual

Back to Contents Page

System Components

Dell™ Latitude™ C840 Service Manual

NOTICE: Unless otherwise noted, each procedure in this document assumes that a part can be

replaced by performing the removal procedure in reverse order.

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System Components: Dell Latitude C840 Service Manual

1 display assembly 7 main battery

2 hinge cover 8 device in module bay

3 microprocessor thermal-cooling

assembly 9 fixed optical drive

4 system board 10 palm rest

5 hard drive 11 keyboard

6 bottom case

Back to Contents Page

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