Dell OptiPlex Tower Plus 7020 - Page 128

Figure 98. Removing the system board
4. Lift the pull tab on the PCIe door outwards to open the PCIe door.
5. Remove the seven screws (#6-32) that secure the system board to the chassis.
6. Remove the two M.2 solid-state drive standoff nuts (M2) that secure the system board to the chassis.
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Removing and installing Field Replaceable Units (FRUs)