Dell C400 User Manual

Dell™ Latitude™ C400 Service Manual

Before You Begin System Components Keyboard Memory Module and Modem Daughter Card Hard Drive Wireless Network Adapter Display Assembly and Display Latch Palm Rest Cooling Fan Reserve Battery Flashing the BIOS Audio Board System Board Battery Latch Pin Assignments for I/O Connectors

Notes, Notices, and Cautions

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.

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. October 2001 Rev. A00

Back to Contents Page

Before You Begin

Dell™ Latitude™ C400 Service Manual

Preparing to Work Inside the Computer Recommended Tools Screw Identification

Preparing to Work Inside the Computer

NOTICE: 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 warranty.

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

1. Make sure that the work surface is clean to prevent scratching the computer cover.

2. Save any work in progress and close all open application programs.

3. Turn off the computer and all attached devices.

NOTE: Make sure the computer is turned off and not in suspend-to-disk or hibernate mode. If you cannot shut

down the computer using the computer's operating system, press and hold the power button for 4 seconds.

4. Make sure 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, including the IDE modular bay cable (if connected).

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.

NOTICE: To avoid damaging the system board, you must remove the battery before you service the computer.

10. Remove the battery from the battery bay.

11. To dissipate any static electricity while you work, use a wrist grounding strap or periodically touch an unpainted metal surface.

12. Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by it edges or by its metal mounting bracket. Hold internal components by their edges, not by their pins.

Recommended Tools

The procedures in this manual require the following tools:

#1 magnetized Phillips screwdriver Small flat-blade screwdriver

5-mm nut driver 7-mm nut driver Needle-nose pliers Flash BIOS update program floppy disk or CD

Computer Orientation

1 back 2 right 3 front 4 left

Screw Identification

When you are removing and replacing components, photocopy the placemat as a tool to lay out and keep track of the screws. The placemat provides the number of screws and their sizes.

Screw Identification

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

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

Hard Drive Door:

Modem Daughter Card:

(1 each)

Keyboard: (4 each)

Display Bezel: (6 each)

(1 each)

Display Assembly:

Palm Rest to Bottom Case:

Rubber screw covers: 6 each

Critical Component Shield: (6 each)

Cooling Fan: (3 each)

Palm Rest to System Board: (6 each)

Audio Board: (2 each)

System Board: (1 each)

Guide pins: 2 each 5-mm hex nuts: 4 each 7-mm hex nuts: 2 each

Back to Contents Page

System Components

Dell™ Latitude™ C400 Service Manual

NOTICE: 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 warranty.

NOTICE: Unless otherwise noted, each procedure in this manual assumes that a part can be replaced by performing

the removal procedure in reverse order.

System Components

1 display 8 memory module/modem cover 2 center cover 9 battery 3 hard drive 10 audio card 4 cooling fan 11 audio card shield 5 reserve battery 12 critical component shield 6 system board 13 palm rest 7 bottom case 14 keyboard

Back to Contents Page

Keyboard

Dell™ Latitude™ C400 Service Manual

Removing the Keyboard Replacing the Keyboard

Removing the Keyboard

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed

batteries.

NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on

the computer.

NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.

1. Remove the hard drive

NOTICE: The key caps on the keyboard are fragile, easily dislodged, and time-consuming to replace. Be careful when

removing and handling the keyboard.

2. Turn the computer right-side up and remove the center cover.

Center Cover Removal

1 center cover

a. Open the computer all the way (180 degrees) so that it lies flat against your work surface. b. Press and hold down the <F4> and <F5> keys to reveal the left release slot of the center cover.

NOTE: To protect the keycaps, it may be helpful to place a straightedge (such as a short ruler) across the first

row or two of keycaps, and press on the straightedge instead of on the keycaps themselves.

c. Insert a flat-blade screwdriver into the slot. While holding the screwdriver, make your hand into a fist, brace

your knuckles against the keyboard, and pry up the center cover. d. Repeat steps b and c for the right release slot, located behind the <F9> and <F10> keys. e. Lift the center cover up and away from the bottom case.

3. Remove the four M2 x 4-mm screws that secure the back edge of the keyboard.

Keyboard Screws

1 M2 x 4-mm screws (4) 2 keyboard locator tab 3 keyboard securing tabs (5)

4. Pry up the keyboard locator tab, lift the back edge of the keyboard slightly, and then pull the keyboard a small distance toward the back of the computer to release the five securing tabs located across the front edge of the keyboard.

5. Rotate the keyboard toward the front of the computer and place it face-down on the palm rest.

NOTICE: Do not pull on the keyboard flex cable.

Keyboard Removal

1 keyboard flex cable

6. Use the pull tab to pull the keyboard flex cable up from its connector on the system board.

The keyboard is now disconnected from the bottom case.

Replacing the Keyboard

1. Replace the hard drive.

2. Place the keyboard face-down on the palm rest, with the keyboard flex cable pointing toward the back of the computer.

NOTICE: To avoid damage to the connector pins, press the keyboard flex cable connector evenly into the interface

connector on the system board, and do not reverse the keyboard connector.

3. Connect the keyboard flex cable to its interface connector on the system board.

To aid with proper flex cable connection, a white locator line has been added near the end of the flex cable. Press the cable into the connector until the white line disappears and hold it steady while you snap the flex cable connector down. (The white line may reappear after the connector is closed; this should not indicate a problem with the connection.)

NOTICE: Position the keyboard flex cable so that it is not pinched when you replace the keyboard in the bottom case.

Keyboard Replacement

1 keyboard securing tabs (5)

4. Carefully rotate the keyboard back and fit it into the bottom case.

Ensure that all five securing tabs are engaged in their respective slots before trying to completely seat the keyboard. Fitting the tabs to the slots may be easiest when viewed from above and slightly behind the front edge of the keyboard. Press down on the left and right <ALT> keys to help control tab/slot alignment.

When the keyboard appears to be completely seated, confirm that the front edge of the keyboard is aligned with the edge of the palm rest before proceeding.

5. Replace the four M2 x 4-mm screws at the back of the keyboard.

6. Replace the center cover.

Back to Contents Page

Memory Module and Modem Daughter Card

Dell™ Latitude™ C400 Service Manual

Removing the Memory Module/Modem Cover Removing the Memory Modules Replacing the Memory Modules Removing the Modem Daughter Card Replacing the Modem Daughter Card

Removing the Memory Module/Modem Cover

NOTE: This procedure covers removing and replacing the memory module located under the memory module/modem

cover on the bottom of the computer. A second memory module resides on the upper surface of the system board under the critical component shield. To replace the memory module under the critical component shield, perform the procedure for removing the palm rest memory module.

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove any installed

batteries.

up to and including removal of the critical component shield. Then replace the

NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on

the computer.

NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.

1. Turn the computer over, and use a #1 Phillips screwdriver to release the two captive screws from the memory module/modem cover.

2. Place your finger under the cover at the indentation, rotate the cover open, and remove it.

Memory Module/Modem Cover

Removing the Memory Modules

NOTICE: Disconnect the computer and any attached devices from electrical outlets, and remove the battery.

NOTICE: To avoid ESD, ground yourself by using a wrist grounding strap or by touching an unpainted metal surface on

the computer.

NOTICE: Read "Preparing to Work Inside the Computer" before performing the following procedure.

1. Remove the memory module/modem cover

NOTICE: To prevent damage to the memory module connector, do not use tools to spread the inner metal tabs that

secure the memory module.

2. Use your fingertips to carefully spread apart the inner tabs on each end of the memory module socket.

The module should pop up.

Memory Module Removal

1 memory module socket 2 inner tabs (2)

3. Lift the memory module out of its socket.

Replacing the Memory Modules

NOTE: Memory modules are keyed, or designed to fit into their sockets, in only one direction.

+ 28 hidden pages