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    Smoke Smoke Smoke!

    Duet Hardware and wiring
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    • rocky00717
      rocky00717 last edited by

      I have a rostock max v3 that i put a duet wifi in. It has worked great for about 300 hours and last night i was printing abs. Went good for about 2 hours and then the cooling fan kicked in for a bridge or something and smoke started coming off the board. Hit the power switch right away and had a look. Disconnected the cooling fan. (I use a berd-air with eswitch module) and tried the power. More smoke.

      I disconnected everything and took out the board and the mosfet seems to be ok. The smoke seems to have been coming from the always on fan port. Cleaned it up a bit with IPA and desoldered the connection and it is quite damaged underneath.
      i had 2 12v 0.1a 40mm fans connected in parallel to the always on fan port.
      Does anyone have any ideas?


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      • DjDemonD
        DjDemonD last edited by

        Are the fans working normally? Are they shorted? Might a wire have been pinched somewhere?

        Looks nasty.

        Simon. Precision Piezo Z-Probe Technology
        www.precisionpiezo.co.uk
        PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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        • rocky00717
          rocky00717 last edited by

          fans seem fine. Wires are not pinched. Definitely shorted but i think shorted on the board. There is only 45ohm resistance across the always on fan port

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          • dc42
            dc42 administrators last edited by

            I'm sorry to hear of your misfortune. It sounds to me that you have or had a short across the VIN rail, either in your always-on fan wiring or possibly a stepper driver. Is there any sign of damage to any of the stepper driver chips?

            Can you confirm that you are using 12V power?

            Duet WiFi hardware designer and firmware engineer
            Please do not ask me for Duet support via PM or email, use the forum
            http://www.escher3d.com, https://miscsolutions.wordpress.com

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            • rocky00717
              rocky00717 last edited by

              @dc42:

              I'm sorry to hear of your misfortune. It sounds to me that you have or had a short across the VIN rail, either in your always-on fan wiring or possibly a stepper driver. Is there any sign of damage to any of the stepper driver chips?

              Can you confirm that you are using 12V power?

              I cannot see any visible problems with the stepper chips. I am using 12V.

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              • dc42
                dc42 administrators last edited by

                With everything disconnected from the Duet, do you also get 45 ohms resistance across the VIN terminal block connections? Is it the same whichever way round you connect the multimeter?

                Duet WiFi hardware designer and firmware engineer
                Please do not ask me for Duet support via PM or email, use the forum
                http://www.escher3d.com, https://miscsolutions.wordpress.com

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                • rocky00717
                  rocky00717 last edited by

                  @dc42:

                  With everything disconnected from the Duet, do you also get 45 ohms resistance across the VIN terminal block connections? Is it the same whichever way round you connect the multimeter?

                  Yes that is with everything disconnected. It kinda jumps all over but the most stable, when i hold really still i get 45ohm. Same both ways.

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                  • dc42
                    dc42 administrators last edited by

                    Thanks. We'll replace your board under warranty, but we'd like the old one back for investigation because it's such an unusual fault. Please contact your supplier.

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

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                    • T3P3Tony
                      T3P3Tony administrators last edited by

                      Thanks for getting in touch we will email you with replacement details.

                      Duet Hardware Designer
                      www.duet3d.com

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