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Miller 330A/BP welder (NO WELD OUTPUT)

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  • #16
    6 A 600v cartridge fuse is F2, part find number 29 on page1of the parts list if that's the right one. It's on the upper left quadrant of the schematic in the transformer primary circuit for mag amp control, remote control and HF timer. Must have been a pretty impressive short circuit somewhere to make the sparks and take out the fuse. Anyway, since it only welds at low power, it sounds like something in the lower left section of the schematic is messed up. R7 adjusts amperage by varying current in the mag amp control winding; I'm guessing it isn't doing that any more. Going to take some power-on troubleshooting.

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    • #17
      i tryed what the trouble giude said but nothing worked i have to look harder in to it

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