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Removing and installing components

NOTE: The images in this document may differ from your computer depending on the configuration you ordered.

Recommended tools

The procedures in this document may require the following tools:

● Phillips screwdriver #1

● Plastic scribe

Screw list

NOTE: When removing screws from a component, it is recommended to note the screw type, the quantity of screws, and

then place them in a screw storage box. This is to ensure that the correct number of screws and correct screw type is

restored when the component is replaced.

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 7490 All-in-One screw list

Component Screw type Quantity Screw image

Cable cover—optional M3x9 1

System-board shield M3x5 5

Bottom cover M3x5 4

M.2 2230 solid-state drive M2x2.5 1

M.2 2280 solid-state drive/

Intel Optane memory

M2x2.5 1

System fan M3x5 3

Wireless-card shield M2x2.5 2

Wireless card M2x2.5 1

10 Removing and installing components

Dell OptiPlex 7490 All-In-One User Manual

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