Dell OptiPlex 5270 All-in-One Service Manual page 36

4. To remove the WLAN card:
a) Remove the screw (M2x2.5) that secures the WLAN card bracket and the WLAN to the system board [1].
b) Slide and lift the WLANs card bracket off the WLAN card [2].
c) Disconnect the antenna cables from the WLAN card [3].
d) Slide and remove the WLAN card out of the WLAN card slot [4].
36 Removing and Installing components