Dell OptiPlex 755 User Manual page 169

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User's Guide
Power Supply
Power Supply
Replacing the Power Supply
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.
1. Follow the procedures in Before You
2. Remove the computer cover (see
3. If installed, remove the optical drive (see
4. If installed, remove the floppy drive or media card reader (see
5. Disconnect the DC power cables from the system board and the drives.
NOTE: Remember the routing of the DC power cables underneath the tabs in the computer frame as you remove them from the system board and
drives. You must route these cables properly when you replace them to prevent their being pinched or crimped.
6. Remove the three screws that attach the power supply to the computer chassis.
1 power supply
7. Slide the power supply toward the front of the computer approximately 1 inch.
8. Lift the power supply up and out of the computer.
9. Slide the replacement power supply into place.
10. Replace the screws that secure the power supply to the back of the computer chassis.
11. Reconnect the DC power cables to the system board and drives (see
Begin.
Removing the Computer Cover).
Removing an Optical Drive).
Floppy
2 mounting screw
Drive).
System Board Components for connector locations).