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Toshiba T1200 internal power supply issues

Was just wondering how would I power the -22 and -9 volt rails on the power supply ? Would I just be able to use a normal dc power supply and just connect the ground to the -22 rail and 22v from the bench power supply to the ground rail of the computer. I just can’t wrap my head around how I would power it externally. If someone could please explain how I should wire it to test if the main parts at least work.
 
What model computer?

Can you post hi res photos of the psu?

I think if you know which rails are which, and the voltages, then you should be able to isolate the psu and supply with all external rails.

Power supply sync might be a concern on power up?
 
The psu is from a Toshiba T1200. A few years ago I found it in the trash, brought it home and decided to try power it up without doing any research, then it showed the red blinking light, only later I decide to open it and discovered that the capacitors were leaking. As i was inexperienced I didn’t know how badly I messed it up so i decided to start disassembling it and creating a wiring diagram to help troubleshoot the board which got me to some places as I could switch some of the visually broken parts. It’s been about a year since I last worked on it and have decided to work on it and ask as many questions while the few people who have a working one of these or knowledge that might help me. I thought I should at least check if the rest of the computer is ok and attempt to power it up with some desktop power supplies, I’m just not entirely sure how I should wire it so I don't create any magic smoke. How would I create -22 volts and +5 volts while using a dc desktop power supply ? Where should I connect the ground for the -22 and +5 ?
 

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I think what you want to focus on is the motherboard. How does this psu connect to it. What pins are what rails.

That psu looks pretty disassembled!
 
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