Miller Synchrowave 350LX Problem

admin

My SW350LX was working fine.  When I turned the power switch off, I heard a noise behind the control panel.  I turned it back on and the foot pedal won’t start an arc or start the gas flow nor does the fan come on.  In “Lift Arc”, I get a small, unsustainable, arc.  In the “On” mode, the fan comes on and gas flows.I had a similar problem 8 years ago; the foot pedal stop working without notice between beads.  It turned out to be either diode D41 or D42 on the motherboard.  I don’t recall which one it was but I replaced both.  I don’t believe they’re the problem this time.Does anyone know what the problem might be this time or have diagnostic instructions?
Reply:I forgot to mention, when I turn it on in DCEN, the volt and amp display sequence is: (V: “209”, A: “882”), (V: “-4”, A: “  “), & finally (V: “- - -“, A: “164”)