Dell PowerEdge SC 420 - Manual (Page 47)

1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet.
2. Open the system. See " Opening the System ."
3. Disconnect the following cables:
l P1 connector to the system board
l P3 and P5 connectors to the SCSI or SATA drives
l P7 connector to the diskette drive (if applicable)
l P8 connector to the optical drive (if applicable)
4. Using a #1 Phillips screwdriver, loosen the two Phillips screws that secure the power supply to the back panel.
5. While pressing the power supply release button, slide the power supply toward the front of the system and then away from the chassis. See Figure 6 -2 .
Figure 6-2. Removing the Power Supply and Cooling Fan
Installing the Power Supply
1. Prepare the new power supply for installation.
2. Align the power supply mounting holes with the mounting holes on the back panel.
3. Slide the power supply toward the back panel until it snaps into place.
4. Using a #1 Phillips screwdriver, install the two Phillips screws that secure the power supply to the back panel.
5. Reconnect the following cables:
l P1 and P2 connectors to the system board
l P3 and P5 connectors to the SATA drives
l P7 connector to the diskette drive (if applicable)
l P8 connector to the optical drive (if applicable)
6. Close the system. See " Closing the System ."
CAUTION: See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting
against electrostatic discharge.