I need some help from a person that knows electrical problems. I have a used welder that I am refurbishing. I have made a repair to the interface board that had a blown capacitor. When I turned that welder on it seemed that everything was okay with the fix so I am testing the weld capabilities. As I don't have it set up for the tig yet, I am just testing the "arc" functions. When I selected AC and used a 7018 3/32" rod I was able to run a bead. When I selected DC (straight polarity) or DC (reverse polarity) and turned the welder on it flipped the circuit breaker. The question(s) that I have:
1) Is this a dead short in the rectifier bridge? diode? If so how can I check the fault?2) Can can check to see if the high frequency works using the "stick" function?
Thanks for any help.
Al