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    Worst day for my Duet Wifi

    Duet Hardware and wiring
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    • Rina
      Rina last edited by

      I connected the end stops for test. X and Y are switches and Z is optical Lerdge. alt text
      When turned on, only some diodes glowed (VIN, 5V+). Wifi was not glowing. I was scared that I had connected the optical sensor incorrectly, turned off the Duet, rechecked the connection, but everything was right. Then I disconnect the VCC line from sensor. The Duet started. The sensor did not work.
      Then I connected to the sensor 5V from the expansion (#1 +5V). The Duet turned on, the sensor was determined. At the moment of the optical sensor was closed, element U3 began to smoke. I immediately turned off the Duet.
      alt text
      alt text
      I have two questions. What did I do wrong and what can I do?

      Thank you!

      JoergS5 1 Reply Last reply Reply Quote 0
      • JoergS5
        JoergS5 @Rina last edited by

        @rina I have only found one thread https://forum.duet3d.com/topic/6462/u3-burned-a-hole-in-itself/6 about burned U3, where the reason was probably a short circuit.

        Rina 1 Reply Last reply Reply Quote 1
        • A Former User
          A Former User last edited by

          There has been speculation of a bad batch of those U3 regulators. If you convince the devs here you didn't wire it wrong they might authorize a warranty replacement.

          But I guess it also depends on when/where it was purchased. If you can't get the board replaced you might be able to buy a 5v supply and connect that to take over from U3. (Or a dc/dc converter to make up 5v from the existing power supply).

          1 Reply Last reply Reply Quote 0
          • Rina
            Rina @JoergS5 last edited by

            @joergs5 Thank you for the link! I checked the diode D2, it seems it is damaged.

            1 Reply Last reply Reply Quote 0
            • dc42
              dc42 administrators last edited by dc42

              I am sorry that your Duet WiFi had failed. Please ask your supplier to replace the board. I am automatically approving warranty replacements in cases of U3 failing.

              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

              Rina 1 Reply Last reply Reply Quote 1
              • Rina
                Rina @dc42 last edited by

                @dc42 Thanks for the answer! I ordered a Duet in Filastruder with delivery to Russia. Do I need to send a card to Filastruder? Can I contact you in private messages?

                dc42 1 Reply Last reply Reply Quote 0
                • dc42
                  dc42 administrators @Rina last edited by

                  @rina, you will need to email Filastruder.

                  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

                  1 Reply Last reply Reply Quote 0
                  • Rina
                    Rina last edited by

                    Thanks to Duet3D for the replacement!

                    Recently completed all connections and here are the results of the first print.

                    Not good, but I am very happy with this result.

                    alt text

                    1 Reply Last reply Reply Quote 2
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