Dell OptiPlex 5270 All-in-One Service Manual page 38

2. To install the WLAN card shield:
a) Align the screw slot on the WLAN card shield with the screw slot on the system board and place the WLAN card shield on the
system board [1].
b) Replace the two screws (M2x2.5) that secure the WLAN card shield to the system board [2]
38 Removing and Installing components