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Millermatic 135 Control PCB Schematic

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  • #31
    Fixed! Welder is now operating normally with full voltage and wire speed controls working. Replaced electrolytic capacitor C24 and ran the unit for awhile simulating trigger on (welding). This is a friend's welder so after he actually tries welding with it I will report back with final outcome.

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    • #32
      Well does it weld good?

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      • #33
        It had the same problem like yours
        Erratic wire feed
        Now I wanted to try it but I'm afraid to connect the board as I'm not sure of which wire from the colored ones goes where on the board so I stopped there

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        • #34
          So please someone

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          • #35
            I changed bad tiristor, ( q5)
            Last edited by samuil_mk; 01-14-2018, 12:59 AM.

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            • #36
              Ok thanks everyone
              I found some schematic on internet, Now my 135 welds perfect

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