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P8/P9 Power Supply

post #1 of 4
Thread Starter 
Hi. I found an old power supply and I want to know if it's working or not. The problem is that it's using P8/P9 connectors and I cannot attach it to my motherboard. I've tested new power supplies without connecting them to a motherboard by connecting the green wire and one of the black wires with a paperclip. But the P8/P9 connectors don't have green wire. Is it possible to test the power supply with the same trick and which wires should I connect?
post #2 of 4
OrangeP8.1 Power Good
Red P8.2 +5 V
YellowP8.3 +12 V
Blue P8.4 −12 V
Black P8.5 Ground
Black P8.6 Ground

Black P9.1 Ground
Black P9.2 Ground
White P9.3 −5 V
Red P9.4 +5 V
Red P9.5 +5 V
Red P9.6 +5 V

Source:
http://en.wikipedia.org/wiki/Power_s...iring_diagrams

(About 3/4 of the way down)

Not sure if this helps, might give you an idea.

Although, if I recall correctly, I'm pretty sure the power button on computers back then were actually the switches as opposed to the motherboard doing the switching.

EDIT:
Yeah, the power switch is connected directly:
Quote:
There are two basic differences between AT and ATX power supplies: The connectors that provide power to the motherboard, and the soft switch. On older AT power supplies, the Power-on switch wire from the front of the computer is connected directly to the power supply.

Edited by SectorNine50 - 7/22/11 at 4:20pm
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post #3 of 4
Thread Starter 
You're right. Thanks! I realized that I wasn't able to figure that out because that wire connecting the power-on switch and the power supply was cut off.
I'm not very good at electronics, but if I place an on/off switch at the end of that cut off wire should make the power supply work. Or not..?
post #4 of 4
Quote:
Originally Posted by Evellon View Post
You're right. Thanks! I realized that I wasn't able to figure that out because that wire connecting the power-on switch and the power supply was cut off.
I'm not very good at electronics, but if I place an on/off switch at the end of that cut off wire should make the power supply work. Or not..?
Not being able to see the wires being referenced, I can't say for sure. However, if they are in fact the wires that ran to the switch on the case, then yes, completing the circuit with a switch (or otherwise) should cause the power supply to power on.
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