Well finding a schematic sure would help u find things easy , but a good look around with a flashlight inside the thing (power off) for anything that looks like it got hot or burnt is good to , I do believe the transformer could take a few moments of over power , but what I suspect is more damaged is the control board , you'll need to remove the covers to see this !!!!!! its in there , and I bet its got one or two fuses on it, id try and replace them first !! then move on to looking at seeing if any power is getting thru control board to other things ~~ working out from control board (its a short journey)
The weld wiring burning doesn't meant the transformer is good, it only means you have shorted hot to ground and thats what happens when hot touches ground it heats and melts. I would start by looking for a schematic for you welder. Check and making sure your getting good power to the power supply, relay(s) first. Also you can ohm out the transformer and check for the proper resistance but without the schematic/wiring diagram I can't say what the specs are. Normally on these the power comes in to the switch and then to the relay(s) which send power to the fan, and then splits to the trigger which allows power to the transformer, wire feed motor etc. But without the diagram your just shooting in the dark.
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If you have gotten a solid answer or repaired your Handler, please share some information with me, the exact same thing has happened to my Handler 140, and I am stumped without values.
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