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Dell™ OptiPlex™ GX620
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 Begin."
   
   
2. Disconnect the DC power cables from the system board and the drives.
   
   

Note the routing of the DC power cables underneath the tabs in the computer chassis as you remove them from the system board and drives. You must route these cables properly when you replace them to prevent them from being pinched or crimped.

3. Remove the four screws that attach the power supply to the back of the computer chassis.
   
   
4. Press the release button located on the floor of the computer chassis.
   
   

1	release button
2	power supply
3	screws (4)
4	AC power connector

5. Slide the power supply toward the front of the computer by approximately 1 inch.
   
   
6. Lift the power supply up and out of the computer.
   
   
7. Slide the replacement power supply into place.
   
   
8. Replace the screws that secure the power supply to the back of the computer chassis.
   
   
9. Reconnect the DC power cables to the power supply.
   
   
10. Connect the AC power cable to the AC power connector.
    
    
11. Replace the computer cover.
    
    

DC Power Connectors

DC Power Connector P1

Pin Number	Signal name	18-AWG Wire
1	+3.3 VDC	Orange
2	+3.3 VDC	Orange
3	GND	Black
4	VCC (+5 V)	Red
5	GND	Black
6	VCC (+5 V)	Red
7	GND	Black
8	PS_PWRGOOD	Gray
9	P5AUX	Purple
10	V_12P0_DIG	Yellow
11	V_12P0_DIG	Yellow
12	+3.3 V	Orange
13	+3.3 V	Orange
14	-12 V*	Blue
15	GND	Black
16	PWR_PS_ON	Green
17	GND	Black
18	GND	Black
19	GND	Black
20	NC	N/C
21	VCC (+5 V)	Red
22	VCC (+5 V)	Red
23	VCC (+5 V)	Red
24	GND	Black
*Use 22-AWG wire instead of 18-AWG wire.

DC Power Connector P2

Pin Number	Signal Name	18-AWG Wire
1	COM	Black
2	COM	Black
3	+12 VDC	Yellow
4	+12 VDC	Yellow

DC Power Connectors P3 and P5

Pin Number	Signal name	18-AWG Wire
1	+3.3 VDC	Orange
2	COM	Black
3	+5 VDC	Red
4	COM	Black
5	+12 VDC	Yellow

DC Power Connector P4

Pin Number	Signal name	18-AWG Wire
1		N/C
2	COM	Black
3	COM	Black
4	+ 3.3 VDC	Orange
5	+5 VDC	Red
6	+12 VDC	Yellow

DC Power Connector P7

Pin Number	Signal Name	22-AWG Wire
1	+5 VCD	Red
2	COM	Black
3	COM	Black
4	+12 VDC	Yellow

DC Power Connectors P8 and P9

Pin Number	Signal name	18-AWG Wire
1	+12 VDC	Yellow
2	COM	Black
3	COM	Black
4	+5 VDC	Red

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