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Problem with XMT 300 CC/CV

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  • Problem with XMT 300 CC/CV

    Hi,
    I have an XMT 300 cc/cv that doesn't power up at all. Plug it in, turn it on, nothing happens. I've checked everything as suggested by the tech line and manual, but can't pinpoint the problem.

    Things that are obviously wrong: The relay coil on the line in is not getting any voltage, so it's not turning on. Voltage on the input capacitors is zero all the time also. Seems like whatever turns on that relay coil is the problem. Is there a way to test, or bypass safely, the "Auto-Link" board?

  • #2
    Xmt300

    The contactor gets power from the control transformer green leads (24VAC). If there is power on this circuit, the pilot light should be on. The ground for the contactor is thru PC6 driver board. I could tell more with serial number (at least the first 2 letters) Remember there is LETHAL Voltage in this unit, and the capacitors can hold a charge.

    Brian

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    • #3
      KE630128 is the serial, and I am not getting a pilot light. There is nothing happening at all, no click, no hum, no light, no readout: nothing at all!

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      • #4
        Check the breakers on the front of the machine, if not, its probably the control transformer gone.
        Brian

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        • #5
          Turns out it's the board. The diodes around the IGBT plugs are all shorted, and resistor R159 looks like it has overheated, especially from the bottom. Here's the bottom of the board:




          Any idea where I can get a replacement or repair board for a good price?

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