Dell OptiPlex 5055 Tower - Power Supply Unit (PSU) Service

NOTE: To remove the PCIe brackets (2 and 4), push the bracket upwards from the inside of your computer to release it and
then lift the bracket away from your computer.
7 Repeat the steps to remove any additional PCIe expansion cards.
Installing PCIe expansion card
1 Insert the PCIe expansion card to the connector on the system board.
2 Secure the PCIe expansion card by pushing the card retention latch until it clicks into place.
3 Repeat the steps to install any additional PCIe expansion cards.
4 Close the release latch.
5 Close the front panel door.
6 Install the:
a Front bezel
b Back cover
7 Follow the procedure in After working inside your computer.
Power supply unit
Removing power supply unit – PSU
1 Follow the procedure in Before working inside your computer.
2 Remove the:
a Cover
b Front bezel
3 Open the Front panel door.
4 To release the PSU:
a Disconnect the PSU cables from the connectors on the system board [1, 2].
b Pull the clips to release the cables from the cable holders [3].
c Unroute the PSU cables from the cable holders [4].
d Remove the screws( 6+/-1) that secure the PSU to the computer [5].
Disassembly and reassembly
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