How to test a standard 20 pin ATX power supply:
Set the meter to test DC voltage.
As you test the power supply with your meter, attach your black lead from your meter to the chassis or to a black wire on the ATX connector and leave it in the same position for the entire test. Also, you only need to test one of each color unless you suspect that one was cut, so where there are 3 oranges, all 3 will have the exact same reading. When you are onsite and testing, write down the power voltages for each color, so that you can provide them if you need to call in to tech support. Please do not round, as we need to determine if some of these are above or below allowed tolerances.
| 4 Pin Berg Connector Used to connect the PSU to small form factor devices, such as 3.5" floppy drives. available in: AT, ATX & ATX-2 |
| 4 Pin Molex
Connector This is used to power various components, including hard drives and optical drives. available in: AT, ATX & ATX-2 |
| 20 Pin Molex ATX
Power Connector This is used to power the motherboard in ATX systems. available in: ATX( ATX-2 have four extra pins) |
| 4 Pin Molex P4 12V
Power Connector Used specifically for Pentium 4 Processor Motherboards. available in: ATX (integrated into the power connector in ATX-2) |
| 6 Pin AUX Connector Provides +5V DC, and two connections of +3.3V. available in: ATX/ATX-2 |
note: The pinouts above relate to the
connectors not the sockets.
note: To power up an ATX or ATX-2 PSU for testing, short
pin 14 (PS_ON) with one of the grounds.