Hi all,
I have a 330 A/BP that we've been using for several years. It's always worked great. A couple of days ago, switched over to AC to weld some aluminum and two minutes into welding, it seemed that the power dropped off. The machine won't arc now on DC or AC unless I drag the tungsten on the work. I see nothing at the points like usual and there seems to be no current there. I'm thinking it's probably a diode issue. Anyone got any troubleshooting input?