Question about A & A Manufacturing Ramsond 40D Plasma Cutter Inverter

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Lotos cut 40 plasma cutter, not firing

I've used my plasma cutter twice, the o.c. light came on, so I cut of power let it reset cut it back on everything looked ok, but the moment I triggered the switch the o.c. light came back on. I have air pressure and the fan comes on, but no fire. The green LED on the top board comes on, ther is a smaller board that is piggy back on the top board that has a smaller green, and red LED they are not coming on at all, I am assuming that this is the pulse modulating board. All components look good, have no plans to go by, and the operators manual dont say much. Would like to get this back online soon. THANKS IF YOU CAN HELP!!!

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Test all the mosfets, good chance one or more are failed.

Posted on Nov 01, 2009

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