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Guru

Join Date: Jul 2008
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Jump Starting a PC Power Supply

06/01/2009 8:20 AM

A 20 year old 600 watt power supply in an old Intel Computer case finally said "enough". It owed me nothing so I was not upset.

There is no motherboard in the case. The old 80287 design had long ago been ripped out and the case served soley as a place to house a half dozen SCSI drives. They are ribbon cabled externally to a workstation alongside.

I've plenty of spare power supplies but they are all looking for newer motherboards. They only work when that big, multipin connector is plugged into a motherboard or a power supply tester.

Does anyone know the Pin-Outs on the big mother board connector and which to jump so I can fool the power supply into running?

Thanks

L.J.

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Join Date: Mar 2009
Location: United Kingdom
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#1

Re: Jump Starting a PC power supply

06/01/2009 8:45 AM

http://web2.murraystate.edu/andy.batts/ps/powersupply.htm

Copy & Paste

Wiring coming off an industry standard circuit board will be:

ORANGE+3.3 V
YELLOW+12 V
BLUE-12 V
RED+5 V
WHITE-5 V (May not be present on recently manufactured supplies)
BLACKGND

GREEN

POWER-ON (Active high -- must be shorted to ground to force power up)
GRAYPOWER-OK

What is this??

PURPLE+5 V STANDBY
BROWN+3.3 V REMOTE SENSING

Design Guide Update

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Guru

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#2
In reply to #1

Re: Jump Starting a PC power supply

06/01/2009 9:07 AM

Thanks Woody!

I'll try it tonight!

L.J.

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#3
In reply to #1

Re: Jump Starting a PC power supply

06/01/2009 9:07 AM

Good link.

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Guru
Engineering Fields - Electrical Engineering - New Member United States - Member - New Member

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#4

Re: Jump Starting a PC power supply

06/01/2009 10:16 AM

Jag,

This is not adding anything to the discussion, but might make some reconsider "throwing out old junk". We recently had an "E-Waste" collection (electronics waste) locally, and I got rid of no less than three of the old-style AT-PC power supplies. I would have gladly donated one or more to you for the price of shipping. Oh well, as the song goes "You don't know what you got till it's gone". And the other saying, you won't have a need for something until shortly after you get rid of it. Perhaps others on our great CR4 site still have some of the old AT supplies sitting around? It would save you from having to fool the newer ATX style into powering up, and possibly keep one more piece of still-useful gear out of a landfill.

Tom

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Guru

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#5
In reply to #4

Re: Jump Starting a PC power supply

06/01/2009 11:31 AM

All this effort was started by upgrading the SCSI controller from a 160 to a 320 version.

Some of the drives are very old, reliable beyond my wildest dreams. However, they are slowing down the entire system. I need only provide power long enough to transfer data from the kluge of old drives to a pair of large SCSI drives so I can initiate a RAID environment.

I'll miss those monster Seagates. The sound they make reminds me of Rolls-Royce jet turbines! If they sounded like Merlins I'd keep 'em!

Thanks, to everyone.

L.J.

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"Both the revolutionary and the creative individual are perpetual juveniles. The revolutionary does not grow up because he cannot grow, while the creative individual cannot grow up because he keeps growing." Eric Hoffer
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Anonymous Poster
#6

Re: Jump Starting a PC Power Supply

06/02/2009 12:32 PM

Can't remember the pin-layout on the AT-PC, I've tricked an ATX power supply before, I'll lookit up and post things here tomorow. You can also buy an ATX pwr-sup at £16 to £20 these days and it will give you 500 to 600W if you need it to.

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