HP EliteBook 8540p Maintenance And Service Manual page 71

5. Remove the WWAN module (3) by pulling the module away from the slot at an angle.
NOTE:
Figure 4-1
Figure 4-2
Reverse this procedure to install the WWAN module.
64 Chapter 4 Removal and replacement procedures
WWAN modules are designed with a notch (4) to prevent incorrect insertion.
Ericsson module antenna locations
Qualcomm module antenna locations