Dell OptiPlex 7440 All-In-One Owner's Manual

Removing the Power Supply Unit - PSU

1. Follow the procedure in Before working inside your computer.
2. Remove the:
   1. stand
   2. back cover
   3. cable cover
   4. speaker cover
   5. system board shield
3. To release the PSU cable:
   1. Unthread the power supply cables from the retention clips in the chassis [1].
   2. Disconnect the power supply cable from the connector on the system board [2].
      NOTE Press lock clip to release the power supply cable from the system board.
   
4. To release the PSU:
   • NOTE There is an additional cable retention clip on the side of the VESA mount bracket. The PSU near that is not visible in the removing cables from retention clips image.
   1. Remove the screw that secures the power supply socket to the chassis [1].
   2. Slide the socket to remove it from the computer [2].
   
5. To remove the PSU:
   NOTE Field Engineers to ensure defective Power Supply Unit is returned along with BIST board.
   1. Remove the screw that secures the PSU to the chassis [1].
   2. Slide the PSU and lift it away from the chassis [2].