HP Compaq nc6300 Maintenance And Service Manual page 167

2. Remove the two HM5.0×9.0 screw locks 1 on each side
of the serial connector.
3. Lift the serial connector module and cable 2 out of the base
enclosure.
4. Disconnect the serial connector module cable 3 from the
system board.
Removing the Serial Connector Module
Reverse the above procedures to install the serial connector
module.
Maintenance and Service Guide
Removal and Replacement Procedures
5–65