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Behringer Europower pmp1680s noise on top of signal

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  • Behringer Europower pmp1680s noise on top of signal

    i have a Behringer Europower pmp1680s noise on top of signal Its weird included video.
    There is no DC on the outputs.
    I'm thinking filtering from the power supply but not sure.
    nosaj
    soldering stuff that's broken, breaking stuff that works, Yeah!

  • #2
    What sort of noise ... hum ... hiss ... parasitic?
    I don't allow the gargler to use my information so won't even bother to try and open your link.
    Support for Fender, Laney, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk
    If you can't fix it, I probably can.

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    • #3
      Almost sounds like hash , sounds digital . I'll see if I can get a scope picture. Reason I used google drive was video was 9.8megs max upload limit here is 9megs.
      nosaj
      soldering stuff that's broken, breaking stuff that works, Yeah!

      Comment


      • #4
        Service manual
        nosaj
        P0A8M_service_PMP1680S_P0A8M_Service_Manual_RevF.pdf
        soldering stuff that's broken, breaking stuff that works, Yeah!

        Comment


        • #5
          Click image for larger version

Name:	20230318_174557.jpg
Views:	37
Size:	1.18 MB
ID:	979363 Here is a pic
          soldering stuff that's broken, breaking stuff that works, Yeah!

          Comment


          • #6
            Where are you looking to see the noise?
            Can you trace it back before the power amps?
            Can you pin point the source?
            Yes, it could be a noisy rail.
            Support for Fender, Laney, Marshall, Mesa, VOX and many more. https://jonsnell.co.uk
            If you can't fix it, I probably can.

            Comment


            • #7
              I'm finding it on all outputs(monitor out, FX out, tape out).
              IDK if I'm overlooking it or what but I'm not seeing the power supply section in the service manual.

              nosaj
              soldering stuff that's broken, breaking stuff that works, Yeah!

              Comment


              • #8
                Power supply is SMPS u29
                SMPS U29.pdf
                nosaj
                soldering stuff that's broken, breaking stuff that works, Yeah!

                Comment


                • #9
                  Looks like the power section is also missing from that service manual too.
                  nosaj
                  soldering stuff that's broken, breaking stuff that works, Yeah!

                  Comment

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