PD50G1 -Vy Testing Positive Voltage

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  • ChrisV
    Senior Member
    • Dec 2013
    • 66
    • USA

    #1

    PD50G1 -Vy Testing Positive Voltage

    Troubleshooting a plasma with no picture. Looking at the YSUS, the -Vy target is -195. My actual is +195v with only the bottom buffer board attached. There is no voltage on VA or VSC with upper buffer board in place.
    I'm thinking, I have a bad upper buffer board. What would cause the -Vy to test positive?
    Thanks for any help that is offered
    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: PD50G1 -Vy Testing Positive Voltage

    Such a positive -Vy would certainly be explosive to any capacitors nearby, so I doubt it's the case. Just need to reverse probes.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment

    • ChrisV
      Senior Member
      • Dec 2013
      • 66
      • USA

      #3
      Re: PD50G1 -Vy Testing Positive Voltage

      Thank you for the reply Tom66.
      Just for clarification, if I check voltage in the way that is described in the photo above, with red probe on + and black probe on -, it is a positive voltage. If I reverse the probes and place the red on the - and the black on the + it has the correct negative voltage.
      Could there be something wrong with my DMM or would this indicate correct voltage at this test point?
      Thanks again.
      PS - Thanks for making the service manuals available

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: PD50G1 -Vy Testing Positive Voltage

        I think it's a mistake in the service manual. Nothing to worry about.
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • ChrisV
          Senior Member
          • Dec 2013
          • 66
          • USA

          #5
          Re: PD50G1 -Vy Testing Positive Voltage

          Thank you Tom

          Comment

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