TC Impact Twin mods

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  • Integrion
    New Member
    • Oct 2019
    • 4
    • USA

    #21
    Re: TC Impact Twin mods

    That's very helpful.

    If I understand correctly then, at initial power-on, if the digital supply doesn't spin up, the MCU will never boot, and therefore the analogue supply will never activate. This would explain why neither switching supply is spinning up.

    I therefore first need to understand why the digital supply isn't spinning up. Looking at the schematic, it appears that the switched 3.3V output rail is what provides the shunt regulator feedback for the digital supply switcher. I'll first check the output filter caps C518, C517, C576 and C575, and then go from there.

    Comment

    • Khron
      Badcaps Legend
      • Sep 2006
      • 1350
      • Finland

      #22
      Re: TC Impact Twin mods

      At least in the bigger Konnekt 48's, the 3.3V output caps crapping out DO impede them from booting. Or best case, they go into this "hiccup" mode, where they start to boot, but the 3.3V rail collapses, undervoltage / brown-out protection kicks in, rinse & repeat.
      Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

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      • LUCAS CAMPANI
        Member
        • Apr 2021
        • 10
        • Brazil

        #23
        Re: TC Impact Twin mods

        Where is this full schematic?

        Comment

        • Khron
          Badcaps Legend
          • Sep 2006
          • 1350
          • Finland

          #24
          Re: TC Impact Twin mods

          Which "full schematic" do you mean?
          Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

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          • LUCAS CAMPANI
            Member
            • Apr 2021
            • 10
            • Brazil

            #25
            Re: TC Impact Twin mods

            To interface that one member post one page only. Impact Twin. I need the reference of "IC18".
            Thanks

            Comment

            • Khron
              Badcaps Legend
              • Sep 2006
              • 1350
              • Finland

              #26
              Re: TC Impact Twin mods

              There is no schematic for the Impact Twin. The internal power supplies are similar (if not identical) to the ones in the Konnekt 48 though.

              What chip (as in, what role it plays) is IC18?
              Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

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              • LUCAS CAMPANI
                Member
                • Apr 2021
                • 10
                • Brazil

                #27
                Re: TC Impact Twin mods

                Its a octo/ photo acoplator.nobody has this diagram?

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                • LUCAS CAMPANI
                  Member
                  • Apr 2021
                  • 10
                  • Brazil

                  #28
                  Re: TC Impact Twin mods

                  PHOTOTRANSISTOR OPTOCOUPLERS
                  Sorry for my english, but is not this component. Its IC18.
                  I need the schematic.

                  Comment

                  • Khron
                    Badcaps Legend
                    • Sep 2006
                    • 1350
                    • Finland

                    #29
                    Re: TC Impact Twin mods

                    IC18 in my "sacrificial" Konnekt 8 (same board as the Konnekt 24 and Impact Twin) is indeed a 6N137 optocoupler.

                    Why exactly do you need "the schematic", though?
                    Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

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                    • LUCAS CAMPANI
                      Member
                      • Apr 2021
                      • 10
                      • Brazil

                      #30
                      Re: TC Impact Twin mods

                      Because the component its not in the board and I need repair this interface.

                      Comment

                      • LUCAS CAMPANI
                        Member
                        • Apr 2021
                        • 10
                        • Brazil

                        #31
                        Re: TC Impact Twin mods

                        Thank you Khron, I will buy 6n137

                        Comment

                        • Khron
                          Badcaps Legend
                          • Sep 2006
                          • 1350
                          • Finland

                          #32
                          Re: TC Impact Twin mods

                          Do you know what that component is used for? And is that the (only) problem with that interface, that needs repairing?
                          Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

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                          • LUCAS CAMPANI
                            Member
                            • Apr 2021
                            • 10
                            • Brazil

                            #33
                            Re: TC Impact Twin mods

                            I dont. This component is near to the power supply and some outputs, but I neither stop to pay attention on what function this have. I will replace and after problably I will have to change some caps.

                            Comment

                            • Khron
                              Badcaps Legend
                              • Sep 2006
                              • 1350
                              • Finland

                              #34
                              Re: TC Impact Twin mods

                              Well... If you DID do a bit more research, you might have discovered that the IC18, a 6N137 (8-pin optocoupler) is actually dealing with the MIDI connectors, and has nothing to do with any power supply.

                              I'm really sorry if this sounds rude, but... Do you actually have any idea what you're doing?

                              It might be a LOT more constructive if you maybe described what problem(s) you're having with your Impact Twin, and we could start from there. But then again, that's just me, i have a thing about logic and making sense...
                              Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

                              Comment

                              • LUCAS CAMPANI
                                Member
                                • Apr 2021
                                • 10
                                • Brazil

                                #35
                                Re: TC Impact Twin mods

                                Phisically the IC is near to the entering of power, I only said this and ask for somebody to tell me a single component that is lacking in the board. I thank you for your help with this. I will replace the component and after this I will search others problem that the device may have.
                                Last edited by LUCAS CAMPANI; 04-26-2021, 06:31 PM.

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                                • LUCAS CAMPANI
                                  Member
                                  • Apr 2021
                                  • 10
                                  • Brazil

                                  #36
                                  Re: TC Impact Twin mods

                                  ��

                                  Comment

                                  • LUCAS CAMPANI
                                    Member
                                    • Apr 2021
                                    • 10
                                    • Brazil

                                    #37
                                    Re: TC Impact Twin mods

                                    Comment

                                    • Khron
                                      Badcaps Legend
                                      • Sep 2006
                                      • 1350
                                      • Finland

                                      #38
                                      Re: TC Impact Twin mods

                                      Right, so just because a component happens to be near other components, it needs to be replaced... And whatever problem you're having, is still a secret

                                      I hope you'll understand if noone provides you any meaningful help.

                                      Have fun shotgunning all the parts on the board... because reasons
                                      Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

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