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Tried to tack a roll cage together yesterday and the machine just blow tungestin off and melted part of the cup, look at machine and there was no output but the negative side of dc no ac no dc postive and you can not adjust the amps for dc negative now with the dial number stays at 200 any ideas as to what is wrong with it. first problem with it in 5 years of using great machine works really well. I believe it was teh over voltage light was on as well the little yellow green light in the upper right hand corner not sure if I called it the right name but its over something anyway. Thanks