HP Compaq nc6400 Maintenance And Service Manual page 159

4. If it is necessary to remove the PC Card assembly from the
digital media board, disengage the hooks 1 on the PC Card
assembly from the tabs on the digital media board.
5. Remove the PC Card assembly 2 from the
digital media board.
Removing the PC Card Assembly
Reverse the above procedure to reassemble and install the
PC Card/digital media board.
Maintenance and Service Guide
Removal and Replacement Procedures
5–63