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Miller 330 A/BP won't strike arc without dragging tungsten on work

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  • #16
    It's the capacitors

    Originally posted by NHTIG View Post
    Check the capacitors..which I am sure is your next step.......
    OK, thanks to some great troubleshooting tips from NHTIG, I've found out I've got a failed high frequency capacitor. He told me how to isolate the bad one so we could still use our machine, at somewhat decreased capacity, until I can get the new parts in there. I'm just going to replace them both. Seems like it's probably time. Many thanks to NHTIG. He's got my vote of confidence!

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    • #17
      Glad you got it figured out...
      .

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      • #18
        Originally posted by hunamongyou View Post
        OK, thanks to some great troubleshooting tips from NHTIG, I've found out I've got a failed high frequency capacitor. He told me how to isolate the bad one so we could still use our machine, at somewhat decreased capacity, until I can get the new parts in there. I'm just going to replace them both. Seems like it's probably time. Many thanks to NHTIG. He's got my vote of confidence!
        No problem, we are all here to help when we can. Thanks for coming back in here and letting people who have been trying to help know what the outcome was. Now when someone else is troubleshooting a similar problem they will know what the outcome was. All who have been trying to help here appreciate knowing what the problem turned out to be.

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        • #19
          how can you check the HF capacitance

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          • #20
            Checking the capacitance of the high voltage capacitors is an exercise in futility. The capacitance can be fine at the couple volts the tester puts through it, yet turn into essentially a direct short at a kilovolt as it arcs internally. High voltage RF capacitors are so cheap, they should be replaced at the first sign of trouble.

            80% of failures are from 20% of causes
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