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Millermatic 210

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  • Millermatic 210

    The wire feed on both the spool gun and mig gun has stopped.
    From the information gleaned from an archived thread I think
    the problem is the transistor at Q11 on board pc1
    ( part# 204807). Given the cost of a new board, or even a
    repair, I’m figuring it’s worth it to try replacing that transistor.
    Does anyone know the genetic part number of that
    transistor? Miller shared their part number but it won’t
    cross reference to anything.
    Thanks for any help with this.

  • #2
    Is Q11 beyond readable? Usually, the Miller Techs can give you more info than just the Miller part number, and the specs they provide can help you find a replacement.

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    • #3
      I did get the specs from them the the transistor store
      tells me that there are differences, even among transistors
      with the same specs

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      • #4
        What are the specs? Is Q11 on a heatsink or one of the transistors used for signals? If it's not on a heatsink, chances are you should be able to read the markings on the transistor body. Can you post a picture?
        Last edited by jjohn76; 06-10-2020, 09:28 PM.

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        • #5
          Best I can do right now.

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          • #6
            Part number and description. It’d be cool if Miller would
            sell the part but they don’t.
            Miller part #127266
            transistor, mosfet N Chan 28 A 100 V to -220AB

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            • #7
              I don't have time to do it now, but if you go to the Digikey or Mouser websites, and enter those specs for MOSFETS, they will probably provide you with an arms-length list of acceptable part numbers.

              In case you are not knowledgeable of transistor specs, the end of that list is the physical form definition. It is TO-220AB, and it means the transistor looks like this:

              https://www.vishay.com/docs/95180/to220abc.pdf
              Last edited by Aeronca41; 06-11-2020, 09:58 AM.

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              • #8
                Unless there's visible damage to the transistor, I'd recommend some basic testing before throwing parts at it, and also confirm that whatever is driving the transistor is not also blown.

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                • #9
                  And you reset the circuit breaker? and checked the trigger wires on the gun?...Bob
                  Bob Wright

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                  • #10
                    Yes to both questions.
                    It’s not only the spool gun but the mig gun as well.

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                    • #11
                      This is the old thread that I’m basing my diagnosis on;

                      https://forum.millerwelds.com/forum/...10-please-help

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                      • #12
                        Am I seeing a chunk out of D14 in lower left? It is directly connected to output to CB1 and BOTH spool and drive motor.

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                        • #13
                          I’ll check it out, thanks

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                          • #14
                            Originally posted by bxcall1 View Post
                            This is the old thread that I’m basing my diagnosis on;

                            https://forum.millerwelds.com/forum/...10-please-help
                            You could certainly have a bad Q11, but I'm loathe to replace parts without confirming they're bad beforehand, and that nothing else is bad nearby...

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                            • #15
                              Q11 deals with spool motor... Q10 deals with the drive motor... both motors are not working...

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