HP COMPAQ NC4200 Maintenance And Service Manual page 147

Removal and Replacement Procedures
3. Disconnect the modem cable from the two connectors 1 on
the system board.
4. Remove the two PM2.0×4.0 screws 2 that secure the modem
board to the system board.
5. Lift the right side of the modem board 3 to disconnect it
from the system board.
6. Remove the modem board.
Removing the Modem Board
Reverse the above procedure to install the modem board.
6–58 Maintenance and Service Guide