HP Compaq 6820s Maintenance And Service Manual page 82

Remove the ExpressCard assembly:
Turn the system board upside down, with the USB connectors toward you.
1.
Remove the two Phillips PM2.0×8.0 screws (1) and the Phillips PM2.0×4.0 screw (2) that secure
2.
the ExpressCard assembly to the system board.
Turn the system board right-side up, with the USB connectors toward you.
3.
Remove the ExpressCard assembly from the system board.
4.
Reverse this procedure to install the ExpressCard assembly.
74 Chapter 4 Removal and replacement procedures