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    7.5 Fuse keeps blowing with nothing connected.

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    Duet Hardware and wiring
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    • PrincessAlbertundefined
      PrincessAlbert
      last edited by

      Hello everyone. Got some problems.
      Am using a Duet Wifi 1.04 on my custom built 3Dprinter. It worked fine yesterday and printed well. Today when I turned the power on, preheated the bed and hotend everything went smooth, it homed befor the printe and then, got me grounding error on the steppers.
      Tried resetting a couple of times, made an inspection and found that the 7.5 fuse for the heater and steppers was blown.. Changed it, plugged everything out from the board except power, turned the power on and poof.. ther it goes again..
      I know the green power cable connector on the board was a bit loose, so i soldered it a bit but no luck.
      Without the fuse and power on I get no VIN reading on the webconsole except the usb power.
      I find no bent connectors or blown chips..

      Any idea what to check for?

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      • dc42undefined
        dc42 administrators
        last edited by

        Does any of the stepper driver chips look damaged?

        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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        • PrincessAlbertundefined
          PrincessAlbert
          last edited by PrincessAlbert

          No, all look intakt. I checkt that the pcb cables have power, mesured the fusecontacts without fuses inserted and god following results shown in picture below.

          alt text

          Feels wierd that the 7.5A fuse blows but that the 1A fuse shows 0V?

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          • dc42undefined
            dc42 administrators
            last edited by

            Does the small square chip U3 look intact?

            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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            • PrincessAlbertundefined
              PrincessAlbert
              last edited by

              yes nothing visible on either front or back side of the chip.

              dc42undefined 1 Reply Last reply Reply Quote 0
              • dc42undefined
                dc42 administrators @PrincessAlbert
                last edited by dc42

                @princessalbert, I am sorry that your Duet seems to have failed. I assume that you haven't mounted it so close to a conductive surface that some pins on the back of the Duet are contacting that surface. If it's a genuine Duet within the 6 month warranty period, ask your supplier to replace it.

                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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