Dell OptiPlex 5490 Service Manual page 11

NOTE: Some systems have magnetic surfaces. Ensure that the screws are not left attached to such surface when
replacing a component.
NOTE: Screw color may vary with the configuration ordered.
Table 1. OptiPlex 5490 All-in-One screw list
Component
Cable cover—optional
System-board shield
Bottom cover
M.2 2230 solid-state drive
M.2 2280 solid-state drive
System fan
Wireless-card shield
Wireless card
Camera assembly
Camera door
Heat sink—UMA
Heat sink—Discrete
Power-supply unit (PSU)
PSU fan
Rear-I/O bracket
System board
Speakers
Screw type
M3x9
M3x5
M3x5
M2x2.5
M2x2.5
M3x5
M2x2.5
M2x2.5
M3x5
M3x5
Captive screws
Captive screws
M3x5
M3x5
M3x5
M3x5
M3 4+7.1xZN
Quantity
1
5
4
1
1
3
2
1
2
2
5
9
2
2
4
9
6
Removing and installing components
Screw image
11