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Syncrowave 180 Gas valve problem

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  • Syncrowave 180 Gas valve problem

    I have a Syncrowave 180. It does not have the digital display. The Gas valve opens as soon as I turn the unit on. I checked the foot pedal its working properly. Checked without foot pedal connected still turns on. Are there any schematics available of the board. I do have electronic equipment to test such as meters and a scope. Thanks

  • #2
    Serial number ???

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    • #3
      The serial # is KK066257 . Appreciate the help.
      Thanks

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      • #4
        Before you go looking at the board, check the gas solenoid. Is it receiving power to turn on, or is it just stuck on?

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        • #5
          Receives power as soon as welder is turned on, opens and wont shut off till power is switched off.

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          • #6
            Click image for larger version

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            • #7
              Thank you very much for the schematic. I'm suspecting Q4 shorted or diode D15 ??? I have the board out on the bench.

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              • #8
                Checked Q4 in "diode mode" seems to be shorted Source to Drain. Continuity in both direction.

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