Dell Precision 620 - Manual (Page 19)

Figure 27. Removing the Power Supply
4. Open the release latch and slide the power supply about 25 mm (1 inch) toward the front of the system.
5. Detach the power supply by rotating the power supply handle outward and down.
6. To completely remove the power supply from the chassis:
a. Remove the AGP Pro card brace .
b. Remove all full-length expansion cards .
c. Remove the AGP Pro expansion-card guide .
d. Disconnect the DC cables connected to the drives and to the system board.
e. Using a flat-tipped screwdriver, pry out the power-supply hinge pin from the chassis foot.
f. While supporting the weight of the power supply, pull the power-supply hinge pin completely out to release the power supply from the
chassis.
When installing a replacement power supply, remember to rotate and secure the "L" end of the hinge pin into the groove on the chassis foot
after installing the hinge pin.
System Board Components
Figure 28 shows the system board and the location of all its sockets and connectors.
Figure 28. System Board Components
1 Power supply
2 Release latch
3 AC power receptacle
4 AC power cable
NOTE: Perform the next step only if you are completely removing the power supply from the chassis.