HP ProBook 6545b Maintenance And Service Manual page 153

Remove the serial connector and cable:
1. Disconnect the serial connector cable 1 from the system board.
2. Remove the two Hex HM5.0×10.0 screw locks 2 that secure the serial connector to the base enclosure.
3. Remove the serial connector 3.
Reverse this procedure to install the serial connector and cable.
Maintenance and Service Guide
Removal and replacement procedures
4–79