HP Compaq 516 Maintenance And Service Manual page 86

Remove the modem module:
1. Turn the system board upside down with the front toward you.
2. Remove the two Phillips PM2.5×4.0 screws 1 that secure the modem module to the system board.
3. Disconnect the modem module 2 from the system board.
4. Disconnect the modem module cable 3 from the modem module.
5. Remove the modem module.
Reverse this procedure to install the modem module.
Maintenance and Service Guide
Removal and replacement procedures
4–43