Dell Latitude C640 - Manual (Page 43)

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System Board
Dell™ Latitude™ C540/C640 Service Manual
Removing the System Board
The system board's BIOS chip contains the service tag sequence, which is also visible on a bar code label on the bottom of
the computer. The replacement kit for the system board includes 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 hard drive .
2. Remove the keyboard .
3. Remove the display assembly .
4. Remove the palm rest .
5. Remove the microprocessor thermal cooling assembly .
6. Remove the microprocessor module .
7. Remove the modem , memory modules , and Mini PCI card .
8. From the bottom of the computer, remove the six M2.5 x 5-mm screws labeled "circle B" that secure the system board
to the bottom case.
9. Remove the three M2.5 x 5-mm screws labeled "circle B" that secure the fan guard to the bottom case.