Dell Optiplex 7070 Small Form Factor Service Manual page 56

e Heatsink assembly
3 To release the PSU:
a Disconnect the CPU power cable from the system board [1].
b Unroute the power cables from the retention clips on the chassis [2].
4 To remove the PSU:
a Remove the 3 screws that secure the PSU to the system [1].
b Disconnect the system power cable from the connector on the system board [2].
c Lift the cables away from the system [3].
d Press the blue release tab [4] at the rear end of the PSU unit, slide the PSU and lift it away from the system [5].
56 Removing and installing components