AS1100 , Yamaha amp , schematic please to identify component

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  • zen
    Badcaps Veteran
    • Apr 2011
    • 511
    #1

    AS1100 , Yamaha amp , schematic please to identify component

    Hi all

    Repairing the RIGHT channel output board .

    Replaced the 2 output devices & now working through circuitry .

    Discovered D130 ( S202 ) measuring O/C , but suspect there may be something special about it , as same diode on LEFT channel board is measuring 900 one way & 600 the other , on diode setting .
    Attached Files
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    • zen
      Badcaps Veteran
      • Apr 2011
      • 511
      #2
      Re: AS1100 , Yamaha amp , schematic please to identify component

      It's a Current regulative diode , type S-202T , manufactured by Semitec .

      Yamaha part number ZE906900

        Comment

        • redwire
          Badcaps Legend
          • Dec 2010
          • 3907
          • Canada
          #3
          Re: AS1100 , Yamaha amp , schematic please to identify component

          I would say it has gone open-circuit.
          S-202T is a current-regulator diode (basically a JFET) 100V 2mA rated.
          So I would expect a diode-drop in one polarity and low resistance sorta constant current in the other direction. It depends on your multimeter how much current it passes on diode-test.
          The datasheet doesn't shows forward direction it needs at least 1.7V-2.3V to begin regulating (pinch off). Internally the gate and source are tied together to make a 2-pin part.

            Comment

            • zen
              Badcaps Veteran
              • Apr 2011
              • 511
              #4
              Re: AS1100 , Yamaha amp , schematic please to identify component

              Thanks for the additional info

              Have ordered one just in case .

                Comment

                • zen
                  Badcaps Veteran
                  • Apr 2011
                  • 511
                  #5
                  Re: AS1100 , Yamaha amp , schematic please to identify component

                  Can confirm after receiving a new diode that previous reading mentioned is correct for this type of device .

                    Comment

                    • zen
                      Badcaps Veteran
                      • Apr 2011
                      • 511
                      #6
                      Re: AS1100 , Yamaha amp , schematic please to identify component

                      Rebuilt Right channel , but still not powering .

                      Only yellow LED flashing , with no AC being released to mains transformer , due to protection relay not clicking over .

                        Comment

                        • zen
                          Badcaps Veteran
                          • Apr 2011
                          • 511
                          #7
                          Re: AS1100 , Yamaha amp , schematic please to identify component

                          Trying to isolate this down , but not easy .

                          Pulled out power board & linked out relay contact , allowing supply to main transformer .

                          I increased AC supply gradually using Variac .

                          Right channel heat sink became fairly warm , & slightly hot .

                          Disconnected Right channel audio board & tried again , to see if unit would power , but no .

                          Suspect still an issue somewhere on Right channel ,& due to protection circuitry being very sensitive , won't allow me to power the amp with just left .

                          Doesn't help that someone else has worked on this before me .

                            Comment

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