2 system board
3 network connector
4 modem connector
5 network cable cover
6 M2.5 x 20-mm screw
The BIOS chip on the system board 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 floppy disk or CD that provides a utility for
transferring the service tag sequence to the replacement system board.
NOTICE: If you received a flash BIOS update floppy disk or CD with the replacement
microprocessor, you must update the BIOS after replacing the microprocessor module.
Removing the System Board
1. Follow the instructions in "Preparing to Work Inside the Computer."
2. Remove the hard drive and the fixed optical drive.
3. Remove any installed Mini PCI Cards.
4. If migrating the memory, remove all installed memory modules.
5. Remove (if migrating) or disconnect the modem daughter card.
6. Remove the keyboard.
7. Remove the hinge cover.
8. Remove the display assembly.
9. Remove the palm rest.
10. Remove the video graphics board.
11. Remove the microprocessor thermal-cooling assembly.
12. If migrating the microprocessor, remove the microprocessor module.
13. Separate the network cable from the system board:
a. First remove the network cable cover: Insert a narrow plastic scribe or small screwdriver
just barely into the slot that faces the back of the computer (do not insert the scribe far
enough to catch on the wires inside), press down on the cover lightly to secure it, and
pry upward to release the cover.
file:///I|/SERVICE%20MANUALS/DELL%20MANUALS/LA...Latitude/C840/C840_SERVICE_MANUAL/sysboard.htm (2 of 5)6/21/2004 1:36:21 AM
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