Dell OptiPlex 3020M Owner's Manual page 16

1. Perform the following steps as shown in the illustration:
a) Remove the screws that secure the cover to the chassis [1].
b) Slide and lift the cover upwards to remove it from the chassis [2].
16 Installing the Accessories
M4 X L8 mm, pitch 0.5 mm, machine screw PUZ plate with thread screw holes — Dell
M3 X L8 mm, pitch 0.5 mm, self-tapping
screw
M3 X L8 mm, pitch 0.35 mm, machine
screw
P,U,PU,UZ- series monitors
E Plate without thread screw holes— Dell
E-series monitors
E Plate with thread screw holes— Dell E-
series monitors
U Plate — Universal monitors