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Dell Latitude C400 Service Manual
DellTM LatitudeTM 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.
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Dell Latitude C400 Service Manual
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
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Before You Begin : Dell Latitude C400 Service Manual
Back to Contents Page
Before You Begin
DellTM LatitudeTM 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.
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Before You Begin : Dell Latitude C400 Service Manual
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:
q #1 magnetized Phillips screwdriver
q Small flat-blade screwdriver
q 5-mm nut driver
q 7-mm nut driver
q Needle-nose pliers
q Flash BIOS update program floppy disk or CD
Computer Orientation
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Before You Begin : Dell Latitude C400 Service Manual
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
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Before You Begin : Dell Latitude C400 Service Manual
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) (1 each)
Keyboard: Display Assembly:
(4 each)
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Before You Begin : Dell Latitude C400 Service Manual
Display Bezel: Palm Rest to Bottom Case:
(6 each)
Rubber screw covers: 6 each
Critical Component Shield: Palm Rest to System Board:
(6 each) (6 each)
Cooling Fan: Audio Board:
(3 each) (2 each)
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Before You Begin : Dell Latitude C400 Service Manual
System Board:
(1 each)
Guide pins: 2 each
5-mm hex nuts: 4 each
7-mm hex nuts: 2 each
Back to Contents Page
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System Components : Dell Latitude C400 Service Manual
Back to Contents Page
System Components
DellTM LatitudeTM 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
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System Components : Dell Latitude C400 Service Manual
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
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System Components : Dell Latitude C400 Service Manual
7 bottom case 14 keyboard
Back to Contents Page
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Keyboard : Dell Latitude C400 Service Manual
Back to Contents Page
Keyboard
DellTM LatitudeTM 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
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Keyboard : Dell Latitude C400 Service Manual
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 and 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
and keys.
e. Lift the center cover up and away from the bottom case.
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Keyboard : Dell Latitude C400 Service Manual
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.
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Keyboard : Dell Latitude C400 Service Manual
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
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Keyboard : Dell Latitude C400 Service Manual
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
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Keyboard : Dell Latitude C400 Service Manual
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 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
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Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual
Back to Contents Page
Memory Module and Modem Daughter
Card
DellTM LatitudeTM 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
up to and including removal of the critical component shield. Then replace the
memory module.
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. Turn the computer over, and use a #1 Phillips screwdriver to release the two
captive screws from the memory module/modem cover.
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Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual
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.
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Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual
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.
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Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual
Replacing the Memory Modules
NOTE: Memory modules are keyed, or designed to fit into their sockets, in only
one direction.
NOTICE: The memory module must be inserted at a 45-degree angle to avoid
damaging the connector.
1. Align the notch in the memory module with the slot in the center of the socket.
2. Slide the edge connector of the module firmly into the socket at a 45- degree
angle, and rotate the module down until you hear a click. If you do not hear the
click, remove the module and reinstall it.
3. Replace the cover and tighten the two captive screws.
Removing the Modem Daughter Card
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. Turn the computer over, and remove the memory module/modem cover.
2. Remove the M2 x 4-mm screw that secures the modem daughter card to the
system board.
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Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual
NOTICE: Do not pull on the modem cable. Pull from the modem connector to
disconnect the cable.
3. Use the pull tab to pull the modem daughter card straight up out of its
connector.
4. Disconnect the modem cable from the modem daughter card.
Modem Daughter Card Removal
1 M2 x 4-mm screw (1)
2 pull tab
3 boss
4 modem connector
5 modem cable
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Memory Module and Modem Daughter Card : Dell Latitude C400 Service Manual
Replacing the Modem Daughter Card
1. Connect the modem cable to the modem daughter card.
NOTICE: The connectors are keyed for correct insertion; do not force the
connections.
2. Using the screw hole and the boss at the opposite corner of the daughter card to
align the card, press the card into its connector on the system board.
3. Install the M2 x 4-mm screw that secures the modem to the system board.
4. Replace the memory module/modem cover and tighten the two captive screws.
Back to Contents Page
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Hard Drive : Dell Latitude C400 Service Manual
Back to Contents Page
Hard Drive
DellTM LatitudeTM C400 Service Manual
Removing the Hard Drive
Replacing the Hard Drive
Removing the Hard Drive
1. Save and close any open files, exit any open programs, and shut down the
computer.
NOTICE: Disconnect the computer and any attached devices from electrical
outlets, and remove the battery.
NOTICE: The hard drive is very sensitive to shock. Handle the hard drive by its
edges (do not squeeze the top of the hard drive case), and avoid dropping it.
NOTICE: Read "Preparing to Work Inside the Computer" before performing the
following procedure.
NOTICE: To prevent data loss, turn off your computer before removing the
hard drive. Do not remove the hard drive while the computer is on, in standby
mode or in hibernate mode.
CAUTION: If you remove the hard drive from the computer when the
drive is hot, do not touch the metal housing of the hard drive.
2. Ground yourself by touching a metal connector on the back of the computer.
3. Turn the computer over. Remove the M2.5 x 12-mm screw from the hard drive
door.
Hard Drive Removal
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Hard Drive : Dell Latitude C400 Service Manual
1 bottom of computer
2 M2.5 x 12-mm screw (1)
3 hard drive door
4. Slide the hard drive straight out of the computer.
Replacing the Hard Drive
NOTICE: Use firm and even pressure to slide the hard drive into place. If you
force the hard drive into place using excessive force, you may damage the
connector.
1. Push the hard drive into the drive bay until it is fully seated in the bay.
2. Replace the M2.5 x 12-mm screw in the hard drive door.
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Hard Drive : Dell Latitude C400 Service Manual
Back to Contents Page
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Wireless Network Adapter : Dell Latitude C400 Service Manual
Back to Contents Page
Wireless Network Adapter
DellTM LatitudeTM C400 Service Manual
Removing the Wireless Network Adapter
Replacing the Wireless Network Adapter
Removing the Wireless Network Adapter
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.
2. Remove the keyboard.
Wireless Network Adapter
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Wireless Network Adapter : Dell Latitude C400 Service Manual
1 wireless cables (2)
2 wireless cable connectors (2)
3. Disconnect the two wireless cables from the wireless card.
4. Spread the two metal securing tabs apart, and pull the card from its socket.
Replacing the Wireless Network Adapter
The wireless card is keyed to the connector. Make sure the card is fully seated in the
socket before attempting to pivot it down into place.
Back to Contents Page
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Wireless Network Adapter : Dell Latitude C400 Service Manual
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Display Assembly and Display Latch : Dell Latitude C400 Service Manual
Back to Contents Page
Display Assembly and Display Latch
DellTM LatitudeTM C400 Service Manual
Removing the Display Assembly
Replacing the Display Latch
Removing the Display Assembly
NOTICE: You must remove the display assembly before you remove the palm rest.
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 battery.
2. Remove the hard drive.
3. Remove the center cover.
4. Close the display.
5. Turn the computer over and remove the two M2.5 x 6-mm screws at the bottom back
corners of the computer.
Display Screws
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Display Assembly and Display Latch : Dell Latitude C400 Service Manual
1 M2.5 x 6-mm screws (2)
6. Turn the computer right-side up and open the display 180 degrees.
Display Assembly
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Display Assembly and Display Latch : Dell Latitude C400 Service Manual
1 display-feed flex cable
2 M2.5 x 12-mm screws (2)
3 display-feed flex cable hold-down board
4 pull tab
7. Remove the two M2.5 x 12-mm screws from the display-feed flex cable hold-down board.
8. Use the pull tab to disconnect the display-feed flex cable from its connector on the system
board.
9. Move the display assembly to an upright position and pull it up out of the computer.
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Display Assembly and Display Latch : Dell Latitude C400 Service Manual
Replacing the Display Latch
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.
To replace the display latch, you must replace the whole bezel.
1. Remove the battery.
2. Remove the hard drive.
3. Open the display 180 degrees, and remove the six rubber screw covers and the six
M2 x 4-mm screws that secure the bezel.
Bezel Removal
1 bezel
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Display Assembly and Display Latch : Dell Latitude C400 Service Manual
2 display latch
3 M2 x 4-mm screw (6)
4 display assembly
4. Use a small flat-blade screwdriver to carefully pry around the perimeter of the bezel until
the bezel separates from the display assembly.
5. Install the new bezel.
Back to Contents Page
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Palm Rest : Dell Latitude C400 Service Manual
Back to Contents Page
Palm Rest
DellTM LatitudeTM C400 Service Manual
Removing the Palm Rest
Replacing the Palm Rest
Removing the Palm Rest
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.
2. Remove the keyboard.
NOTICE: You must remove the display assembly before you remove the palm
rest; the display hinges pass through the back of the palm rest.
3. Remove the display assembly.
4. Turn the computer over and remove the four M2.5 x 6-mm screws (two screws
to each side of the battery bay).
Palm-Rest Screws on Bottom of Computer
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Palm Rest : Dell Latitude C400 Service Manual
1 M2.5 x 6-mm screws (4)
2 M2.6 x 1.8-mm screws (4)
3 M2 x 4-mm screws (2)
4 M2.5 x 6-mm screws (2)
5. Remove the four M2.6 x 1.8-mm screws located inside the battery bay.
6. Remove the two M2.5 x 6-mm screws located near the service tag at the back
edge of the computer.
7. Turn the computer over and remove the two M2 x 4-mm screws located above
the serial, docking, and video connectors on the back panel.
Critical Component Shield
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Palm Rest : Dell Latitude C400 Service Manual
1 M2 x 4-mm screws (6) (one screw may be captive)
2 critical component shield
8. Remove the six M2 x 4-mm screws (one of which may be captive) that secure
the critical component shield to the system board, and lift the shield away.
NOTE: At this point, the memory module under the critical component shield
can be replaced.
Palm Rest Removal
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Palm Rest : Dell Latitude C400 Service Manual
1 M2.5 x 6-mm screws (6)
2 LED cable
3 palm-rest flex cable
9. Remove the six M2.5 x 6-mm screws that secure the palm rest to the system
board.
10. Disconnect the LED and palm-rest flex cables.
11. If a Mini PCI wireless card is installed, disconnect the two wireless cables from
the card.
12. Lift the palm rest away.
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Palm Rest : Dell Latitude C400 Service Manual
Replacing the Palm Rest
To aid with proper flex cable connection, a white locator line has been added near the
ends of the flex cables. When replacing the LED and palm-rest flex cables, 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.)
Back to Contents Page
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Cooling Fan : Dell Latitude C400 Service Manual
Back to Contents Page
Cooling Fan
DellTM LatitudeTM C400 Service Manual
Removing the Cooling Fan
Removing the Cooling Fan
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.
2. Remove the keyboard.
3. Remove the display assembly.
4. Remove the palm rest.
Cooling Fan Removal
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Cooling Fan : Dell Latitude C400 Service Manual
1 cooling fan
2 M2.5 x 6-mm screws (3)
3 fan cable
4 fan extender cable
5. Remove the fan cable from the fan extender cable that runs under the system
board.
6. Remove the three M2.5 x 6-mm screws that secure the cooling fan.
7. Lift out the cooling fan.
Back to Contents Page
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Cooling Fan : Dell Latitude C400 Service Manual
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Reserve Battery : Dell Latitude C400 Service Manual
Back to Contents Page
Reserve Battery
DellTM LatitudeTM C400 Service Manual
Removing the Reserve Battery
Replacing the Reserve Battery
Removing the Reserve Battery
NOTICE: The reserve battery provides power to the computer's RTC and
NVRAM when the computer is turned off. Removing the battery causes the
computer to lose the date and time information as well as all user-specified
parameters in the BIOS. If possible, make a copy of this information before you
remove the reserve battery.
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.
2. Remove the keyboard.
3. Remove the display assembly.
4. Remove the palm rest.
Reserve Battery Removal
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Reserve Battery : Dell Latitude C400 Service Manual
1 reserve battery connector on system board
2 reserve battery cable
3 reserve battery
5. Disconnect the reserve battery cable from the system board connector.
6. Pry the reserve battery free from the system board. The reserve battery is
attached to the system board with a piece of adhesive tape.
7. Remove any remnants of the adhesive tape from the system board.
Replacing the Reserve Battery
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Reserve Battery : Dell Latitude C400 Service Manual
1. Connect the reserve battery cable to the system board connector.
2. Press the reserve battery into place on the system board.
3. Update the BIOS using a flash BIOS update program floppy disk or CD. For
instructions on how to flash the BIOS, see "Flashing the BIOS."
Back to Contents Page
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Flashing the BIOS : Dell Latitude C400 Service Manual
Back to Contents Page
Flashing the BIOS
DellTM LatitudeTM C400 Service Manual
Perform the following steps to update the BIOS:
1. Make sure that the AC adapter is plugged in and that the main battery is
installed properly.
2. Turn on the computer. The following error message appears:
System hardware failures: #0010
Strike the F1 key to shutdown
3. Instead of pressing , insert the Flash BIOS update floppy disk or CD into
the appropriate drive and press , and then press . The computer
displays the following message on the screen:
Failure override
Processor update failure. Reload current BIOS
Strike the F1 key to continue, F2 to run the setup utility.
4. Press . The computer continues to boot and updates the new BIOS.
5. Press to enter the system setup program and reset the boot sequence
with the appropriate drive, if required.
6. Press to exit the system setup program.
7. Remove the Flash BIOS update floppy disk or CD from the drive and restart the
computer.
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Flashing the BIOS : Dell Latitude C400 Service Manual
Back to Contents Page
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Audio Board : Dell Latitude C400 Service Manual
Back to Contents Page
Audio Board
DellTM LatitudeTM C400 Service Manual
Removing the Audio Board
Replacing the Audio Board
Removing the Audio Board
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.
2. Remove the keyboard.
3. Remove the display assembly.
4. Remove the palm rest.
Audio Board Removal
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Audio Board : Dell Latitude C400 Service Manual
1 M2 x 4-mm screws (2)
2 audio board shield
3 audio board
5. Remove the two M2 x 4-mm screws from the audio board shield, and remove
the shield.
6. Pull the audio board up out of its connector.
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Audio Board : Dell Latitude C400 Service Manual
Replacing the Audio Board
The audio board can be easily misaligned. When replacing it, first align the two screw
holes in the board with the holes in the bosses. Then, as you press the audio board
into the connector, sight sideways between the audio board and the system board to
ensure that all pins on the audio board connector are headed correctly into the system
board connector.
Back to Contents Page
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System Board : Dell Latitude C400 Service Manual
Back to Contents Page
System Board
DellTM LatitudeTM C400 Service Manual
Removing the System Board
Replacing the System Board
Removing the System Board
The system board's BIOS chip contains the service tag sequence, which is also visible on a
barcode label on the bottom of the computer. The replacement kit for the system board
may include a CD that provides a utility for transferring the service tag sequence to the
replacement system board.
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 PC Card or plastic blank, if present, from the PC Card slot.
2. Remove the hard drive.
3. Remove the keyboard.
4. Remove the display assembly.
5. Remove the palm rest.
6. Remove the wireless network adapter, if present.
7. Remove the modem daughter card, if present.
8. Remove all installed memory modules.
9. Remove the audio board.
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System Board : Dell Latitude C400 Service Manual
System Board Removal
1 fan
2 reserve battery cable
3 connector for fan extender cable
4 hard-drive connector
5 M2 x 4-mm screw (1)
6 memory module socket
7 guide pins (2)
8 5-mm hex nuts (4)
9 7-mm hex nuts (2)
10. Remove the four 5-mm hex nuts near each end of the serial and video connectors.
11. Use a flat-blade screwdriver to remove the two 7-mm hex nuts near each end of the
docking connector.
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System Board : Dell Latitude C400 Service Manual
12. Remove the two guide pins from the IDE connector.
13. Disconnect the cooling fan from the fan extender cable.
14. Disconnect the fan extender cable from the connector beside the internal memory
socket.
15. Disconnect the reserve battery cable from the system board.
16. Remove the M2 x 4-mm screw that secures the right front corner of the system
board.
17. Disengage the system board from the back panel.
Replacing the System Board
While replacing the system board, pull the fan extender cable aside to avoid trapping it
beneath the system board. After replacing the system board, route the cable between the
hard-drive connector and the internal memory socket.
After you have replaced the system board, insert the floppy disk or CD that accompanied
the replacement system board into the appropriate drive, and turn on the computer. Follow
the instructions on the screen.
NOTE: After replacing the system board, be sure to enter the computer's service tag
sequence into the BIOS of the replacement system board.
Back to Contents Page
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Battery Latch : Dell Latitude C400 Service Manual
Back to Contents Page
Battery Latch
DellTM LatitudeTM C400 Service Manual
Removing the Battery Latch
Replacing the Battery Latch
Removing the Battery Latch
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 PC Card or plastic blank, if present, from the PC Card slot.
2. Remove the hard drive.
3. Remove the keyboard.
4. Remove the display assembly.
5. Remove the palm rest.
6. Remove the wireless network adapter, if present.
7. Remove the modem daughter card, if present.
8. Remove all installed memory modules.
9. Remove the audio board.
10. Remove the system board.
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Battery Latch : Dell Latitude C400 Service Manual
Battery Latch Removal
1 tension spring
2 bottom case
3 battery latch
4 battery release-button tabs
NOTICE: The tabs on the release button are plastic. When squeezing the tabs,
be careful not to break them.
11. On the inside of the bottom case, use needle-nose pliers to gently squeeze the
two release-button tabs together and push the tabs down through the hole,
catching the release button on the outside of the bottom case.
12. To remove the battery latch, unhook the small tension spring located on the
metal post next to the hard drive.
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Battery Latch : Dell Latitude C400 Service Manual
Replacing the Battery Latch
1. With the inside of the bottom case facing up, place the battery latch in position.
2. Turn the bottom case over and align the slot in the battery latch with the release-
button slot in the bottom case.
3. Holding the battery latch in place, press the release-button tabs through the
underside of the bottom case and into the battery latch until the tabs snap into
place.
4. Replace the tension spring.
Back to Contents Page
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Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual
Back to Contents Page
Pin Assignments for I/O Connectors
DellTM LatitudeTM C400 Service Manual
Serial Connector USB Connector
Docking Connector IDE Module Bay Connector
Video Connector
Serial Connector
Pin Signal
1 DCD
2 RXDA
3 TXDA
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
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Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual
Docking Connector
Pin Signal Pin Signal Pin Signal Pin Signal
51 HSYNC 101 VGA_GRN 151 GND
1 STRB#/5V
52 VSYNC 102 GND 152 CLK_SPCI
53 GND 103 VGA_RED 153 GND
2 PD0
54 DOCKED 104 GND 154 SAD0
3 PD1 55 USB_VD1+ 105 VGA_BLU 155 SAD1
4 PD2 56 USB_VD1- 106 DOCK_SD/MODE 156 SAD2
5 PD3 57 GND 107 D_IRTX 157 SAD3
6 PD4 58 USB_VD2+ 108 D_IRRX 158 SAD4
7 PD5 59 USB_VD2- 109 GND 159 SAD5
8 PD6 60 DOCKOC1# 110 SPIRQB# 160 SAD6
9 PD7 61 RUN_ON# 111 SPIRQC# 161 GND
10 GND 62 GND 112 DAT_DDC2 162 SAD7
11 DOCK_SPKR 63 NC 113 CLK_DDC2 163 SAD8
12 DOCK_MIC 64 DOCK_SCLK 114 SPAR 164 SC/BE0#
13 DOCK_LINE 65 DOCK_LRCK 115 SPME# 165 SAD9
14 DOCK_CDROM 66 DOCK_MCLK 116 GND 166 SAD10
15 GND 67 GND 117 SSERR# 167 SAD11
16 NC 68 +12V 118 SPERR# 168 SAD12
17 POWER_SW# 69 AFD# 119 SLOCK# 169 GND
18 QPCIEN# 70 ERROR# 120 SSTOP# 170 SAD13
19 S1.6M_EN# 71 ACK# 121 GND 171 SAD14
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Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual
20 DFDD/LPT# 72 GND 122 SDEVSEL# 172 SAD15
21 GND 73 INIT# 123 STRDY# 173 SAD16
22 NC 74 SLCT_IN# 124 SIRDY# 174 SC/BE1#
23 NC 75 BUSY 125 SFRAME# 175 CD/BE2#
24 D_ACTLED 76 PE 126 SCLKRUN# 176 GND
25 D_PWRLED 77 SLCT 127 GND 177 SAD17
26 DOCK_PWR_SRC 78 GND 128 SGNTA# 178 SAD18
27 DOCK_PWR_SRC 79 DAT_SMB 129 SREQA# 179 SAD19
28 DOCK_PWR_SRC 80 DCLK_SMB 130 SGNT0# 180 SAD20
29 GND 81 SMB_INIT# 131 SREQ0# 181 SAD21
30 +5VDOCK 82 GND 132 SPCIRST# 182 GND
31 +5VDOCK 83 DAT_DOCKSM1 133 SH1SEL# 183 SAD22
32 +5VDOCK 84 CLK_DOCKSM1 134 GND 184 SAD23
33 +5VDOCK 85 DAT_DOCKKBD 135 SWRPRT# 185 SAD24
34 +5VDOCK 86 CLK_DOCKKBD 136 SDSKCHG#/DRQ 186 SC/BE3#
35 GND 87 GND 137 SDIR# 187 SAD25
36 DOCK_PWR_SRC 88 RI0 138 STRK0# 188 GND
37 DOCK_PWR_SRC 89 CTS0 139 SSTEP# 189 SAD26
38 DOCK_PWR_SRC 90 RTS0 140 SDRV1# 190 SAD27
39 DOCK_PWR_SRC 91 DSR0 141 GND 191 SAD28
40 GND 92 GND 142 SMTR1# 192 SAD29
41 DOCK_+DC_IN 93 DTR0 143 SWRDATA# 193 SAD30
42 DOCK_+DC_IN 94 TXD0# 144 SWGATE# 194 SAD31
43 DOCK_+DC_IN 95 RXD0# 145 SRDATA# 195 GND
44 DOCK_+DC_IN 96 DCD0 146 SINDEX# 196 NC
45 DOCK_+DC_IN 97 NC 147 GND 197 NC
46 DOCK_+DC_IN 98 +5VSUS 148 NC 198 NC
47 DOCK_+DC_IN 99 NC 149 +5VALW 199 NC
48 DOCK_+DC_IN 100 NC 150 NC 200 GND
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Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual
49 GND
50 LOW_PWR
Video Connector
Pin Signal Pin Signal
1 RED 9 CRT_VCC
10 GND
2 GREEN
11 NC
12 DAT_DDC2
3 BLUE
13 HSYNC
4 NC
14 VSYNC
5 GND
15 CLK_DDC2
6 GND
7 GND
8 GND
USB Connector
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Pin Assignments for I/O Connectors: Dell Latitude C400 Service Manual
Pin Signal
1 VCC
2