HP ProBook 6545b Maintenance And Service Manual page 141

Remove the modem module:
1. Remove the Phillips PM2.0×5.0 screw 1 that secures the modem module to the system board.
2. Lift the right side 2 of the modem module to disconnect it from the system board.
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
4–67