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    Shorted circuit for hot end fan

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    • gpermanundefined
      gperman
      last edited by

      I shorted out the circuit for my hot end fan, is there any way to repair it or will I need to buy a new duet2 wifi board?

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      • jens55undefined
        jens55
        last edited by

        Check the fuses and the mosfet for that particular fan that you shorted. Chances are you will see a small crater in the mosfet chip and yes, it can be replaced.

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        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          https://duet3d.dozuki.com/Wiki/Connector_and_spare_part_numbers#Section_Fan_mosfet

          Z-Bot CoreXY Build | Thingiverse Profile

          gpermanundefined 1 Reply Last reply Reply Quote 0
          • gpermanundefined
            gperman @Phaedrux
            last edited by

            @phaedrux Thank you!

            Also, does anyone know of a wire strain relief apparatus that goes on the two main in connectors for a smart effector? The movement of the effector keeps breaking my wires art the crimp.

            dc42undefined 1 Reply Last reply Reply Quote 0
            • gpermanundefined
              gperman
              last edited by gperman

              unnamed.jpeg

              TR5 and TR9 dont not seem to be damaged. The 3 blade fuses are intact as well.

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              • Phaedruxundefined
                Phaedrux Moderator
                last edited by

                The damage isn't always visible.

                You can test them with a multimeter. Be careful with the probe tips.

                https://www.google.com/search?q=testing+mosfet+with+multimeter&oq=testing+mos&aqs=chrome.3.69i57j0l9.4510j0j7&sourceid=chrome&ie=UTF-8

                Z-Bot CoreXY Build | Thingiverse Profile

                gpermanundefined 1 Reply Last reply Reply Quote 0
                • gpermanundefined
                  gperman @Phaedrux
                  last edited by gperman

                  @phaedrux digikey kept sending me the wrong components.

                  I resoldered in a new mosfet but that didnt change any symptoms. Took the hot fan off and tested, works good. heated the hot end up past the threshold fo rthe fan and only see 3v at the pins off the duet2 wifi board.

                  I replaced the mosfet at TR5 (Fan0) I believe that's the correct fan for the hotend. No effect.

                  I suppose I could switch the fan to pwm fan2 but that doesn't fix my board.

                  dc42undefined 1 Reply Last reply Reply Quote 0
                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    Can you show a photo of the repair job?

                    Z-Bot CoreXY Build | Thingiverse Profile

                    gpermanundefined 1 Reply Last reply Reply Quote 0
                    • gpermanundefined
                      gperman @Phaedrux
                      last edited by

                      @phaedrux alt text

                      gpermanundefined 1 Reply Last reply Reply Quote 0
                      • gpermanundefined
                        gperman @gperman
                        last edited by

                        @gperman sorry for the poor camera quality. That was the best I could do. These are very small.

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                        • gpermanundefined
                          gperman
                          last edited by

                          @gperman i didnt touch anything but TR5

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                          • dc42undefined
                            dc42 administrators @gperman
                            last edited by

                            @gperman said in Shorted circuit for hot end fan:

                            @phaedrux Thank you!

                            Also, does anyone know of a wire strain relief apparatus that goes on the two main in connectors for a smart effector? The movement of the effector keeps breaking my wires art the crimp.

                            I tie the cables to the Bowden tube. It doesn't completely eliminate flexing, but it does reduce 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

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

                              @gperman said in Shorted circuit for hot end fan:

                              @phaedrux digikey kept sending me the wrong components.

                              I resoldered in a new mosfet but that didnt change any symptoms. Took the hot fan off and tested, works good. heated the hot end up past the threshold fo rthe fan and only see 3v at the pins off the duet2 wifi board.

                              I replaced the mosfet at TR5 (Fan0) I believe that's the correct fan for the hotend. No effect.

                              I suppose I could switch the fan to pwm fan2 but that doesn't fix my board.

                              Check that you still have VIN voltage on the positive output pin of the fan connector. Also measure the gate to source voltage of the mosfet. It should be 3.3V when the fan is supposed to be on, and 0V when it is supposed to be off.

                              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

                              gpermanundefined 1 Reply Last reply Reply Quote 0
                              • gpermanundefined
                                gperman @dc42
                                last edited by gperman

                                @dc42 i measured the V+ Header pin on the duet2wifi board (multimeter between v+ and - ) when the fan is supposed to be on and it outputs 3.something volts. Forgot to write it down.

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                                • gpermanundefined
                                  gperman @dc42
                                  last edited by

                                  @dc42 performed a mosfet continuity test as per:
                                  https://www.google.com/search?q=testing+mosfet+with+multimeter&oq=testing+mos&aqs=chrome.3.69i57j0l9.4510j0j7&sourceid=chrome&ie=UTF-8#kpvalbx=_6gCnYJmFE-yj_Qb_xKjgBg17

                                  Realllllly difficult to get my finger in there to short out all 3 pins but i think I did......maybe.

                                  When I short out all 3 then probe source to drain I get temporary continuity that slowly dissipates to open circuit. Then probe source to gate and get the same thing......light continuity 1900 or so that dissipates to 1.

                                  pretty sure its a bad mosfet. Going to resolder one in and do it again I guess.....

                                  gpermanundefined 1 Reply Last reply Reply Quote 0
                                  • gpermanundefined
                                    gperman @gperman
                                    last edited by

                                    Using that test from that link, I cant seem to turn on any of my mosfets. I tried 4 so far. Held probes to source and gate then source and drain, nothing. No continuity

                                    gpermanundefined 1 Reply Last reply Reply Quote 0
                                    • gpermanundefined
                                      gperman @gperman
                                      last edited by gperman

                                      yea this circuit is dead. I ripped the copper trace off the board for the source terminal.

                                      I cant even get the hotfan to work with the fan2 circuit. I am way out of my depth here. All I've managed to print is benchies after 2 year of owning this predator. I think it's time to toss this whole thing in the trash and buy a prusa.

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

                                        @gperman said in Shorted circuit for hot end fan:

                                        yea this circuit is dead. I ripped the copper trace off the board for the source terminal.

                                        I did that once. I repaired it by adding a fine wire between the mosfet source terminal and a nearby component that was connected to ground.

                                        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

                                        gpermanundefined 1 Reply Last reply Reply Quote 0
                                        • gpermanundefined
                                          gperman @dc42
                                          last edited by

                                          @dc42 I bought the genuine duet2 wifi board from you. can I send it back to you for repair? how much would that cost?

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                                          • Phaedruxundefined
                                            Phaedrux Moderator
                                            last edited by Phaedrux

                                            Where are you located? May find a local option here: https://forum.duet3d.com/topic/13875/community-repairs?_=1622215254328

                                            Z-Bot CoreXY Build | Thingiverse Profile

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