A diode tester can test for shorted IGBTs, but you need and IGBT tester to fully test them. The big question is there any damage to the pcb that drives the IGBTs? The service manual doesn't have much more information than the owner's manual.
On a machine still in production Miller will give zero...
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Look up how to get into the user menus. You may have the wrong tungsten size set. You must set the right size here because this sets up the arc start
settings automatically. Make sure this matches what you are using. Also check your gas flow, if to high, to will see hard arc starting at low amps....
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