HP ProBook 4310s Maintenance And Service Manual page 88

Remove the modem module:
1. Remove the two Phillips PM2.0×4.0 screws 1 that secure the modem module to the system board.
2. Lift the modem module 2 away from the system board to disconnect it.
3. Disconnect the modem module cable 3 from the modem module.
4. Remove the modem module.
Reverse this procedure to install the modem module.
Maintenance and Service Guide
Removal and replacement procedures
4–43