Dell OptiPlex 9020M Owner's Manual page 18

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].
18
M3 X L8 mm, pitch 0.5 mm, self-
tapping screw
M3 X L8 mm, pitch 0.35 mm,
machine screw
E Plate without thread screw
holes— Dell E-series monitors
E Plate with thread screw holes—
Dell E-series monitors
U Plate — Universal monitors