power supply for mig welder

The units i have are the Jobsite, 70lb Breadbox on Steroids type.
they have been solid units
 
Here is my dilemma, I have two mig welders , both are US. One has the wire feed psu board broken (sip 200 amp) and the other (afrox 200 amp) has a transformer problem . I was just trying to think of a way to get them both working. I could probably build one out of the other, but I was trying to get both to work .
 
One has the wire feed psu board broken .

One of my two 1980s ESAB Smashweld 180 MIGs died earlier this month, no life at all when I turned it on and pressed Go.
I checked a grinder worked on the same outlet and checked the fuse in the plug, both OK.
Stripping out the control board revealed some of the polymer foil capacitors were cracked, figuring it was worth a punt I called in the local Maplin store and bought modern equivalents for the grand sum of £4.11 and fitted them.
That worked!

Had the caps not fixed the MIG I was considering replacing all the transistors on the board and if that didn't work replacing the board with a small relay to power the gas solenoid and a cheap DC motor variable speed control for the feed, this would lose the link between voltage and feed speed but if you can set up a MIG that's no issue really.
Regards,
Nick
 
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