Dell Precision 3520 Owner's Manual page 26

f SSD card or hard drive
3 To release the chassis frame:
a Release the WLAN and WWAN cables from the routing channels [1].
b Disconnect the speaker cable from the connector on the system board [2].
c Lift the latch and disconnect the keyboard cable, touchpad cable and pointstick cable from the connector [ 3, 4, 5, 6].
4 To remove the chassis frame:
a Remove the screws (M2.0x3.0, M2x5) that secure the chassis frame to the computer [1].
b Lift the chassis frame away from the computer [2].
26 Removing and installing components