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    Duet 3 6HC Output_0 always on

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    Duet Hardware and wiring
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    • razrudyundefined
      razrudy @fcwilt
      last edited by razrudy

      @fcwilt 1000W 40A PSU too much for the board

      @tpyoknig I am inclined to believe that most likely the mosfet on the board is the culprit for your problem

      From dozuki manual :
      "The ground side of OUT_0 is switched by the mosfet and the positive side is protected by a 15A fuse."

      tpyoknigundefined fcwiltundefined 2 Replies Last reply Reply Quote 1
      • tpyoknigundefined
        tpyoknig @razrudy
        last edited by

        @razrudy That was my conclusion as well but per Filastruder I have to have a mod/admin approve to get an RMA issued.

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        • fcwiltundefined
          fcwilt @razrudy
          last edited by

          @razrudy said in Duet 3 6HC Output_0 always on:

          @fcwilt 1000W 40A PSU too much for the board

          Your bed heater draws 40 amps?

          Wow.

          Frederick

          Printers: A FT-5 with the 713 upgrade bits, a custom MarkForged style, a small Utilmaker style, a small CoreXY from kit and a E3D MS/TC setup. Various hotends. Using Duets (2 and 3) running 3.4.6

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          • Phaedruxundefined
            Phaedrux Moderator
            last edited by

            It would appear that the mosfet for Out_0 has failed closed. Not a good situation. Please contact your vendor and initiate a warranty exchange and include a link to this thread as authorization.

            Z-Bot CoreXY Build | Thingiverse Profile

            tpyoknigundefined 1 Reply Last reply Reply Quote 2
            • razrudyundefined
              razrudy
              last edited by razrudy

              Can you see any damage or something on the mosfet on the board? Maybe one "leg" is not soldered properly
              1615243318265-pxl_20210308_221256774.jpg

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              • tpyoknigundefined
                tpyoknig @Phaedrux
                last edited by

                @Phaedrux thank you - I've linked them to this thread.

                @razrudy the mosfet looks fine. No physical damage, bulges, loose connections etc.

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