HP EliteBook 820 G1 Maintenance And Service Manual page 93

3. Remove the WLAN module (3) by pulling the module away from the slot at an angle.
NOTE:
If the WLAN antenna cables are not connected to the terminals on the WLAN module,
protective sleeves should be installed on the antenna connectors, as shown in the following illustration.
Reverse this procedure to install the WLAN module.
Component replacement procedures
ENWW 83