Dell OptiPlex Small Form Factor 7020 Owner's Manual page 88

Restricted - Confidential
Figure 42. Removing the power-supply unit
Steps
1. Disconnect the power-supply cables from their connectors (ATX CPU1, ATX CPU2 and ATX SYS) on the system board.
2. Remove the power-supply cables from the routing guides on the chassis.
3. Remove the three screws (#6-32) that secure the power-supply unit to the chassis.
4. Slide and lift the power-supply unit off the chassis.
88 Removing and installing Field Replaceable Units (FRUs)