Yamaha RX-A1020 protect

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  • hanasaku
    New Member
    • Mar 2022
    • 9
    • sweden
    #1

    Yamaha RX-A1020 protect

    HI, i wonder i someone can guide me with my yamaha receiver, i test almost everything that i found on the net, im run out of option, i have in all the channel -7v and just the right front -5.2v, i check and i have randomly 6 and 8 v from the signal AMP_OLV, all the power supply signal are ok, sometines i have goog voltages on the +B and -B but now a have 70v and -55v.

    Thanks for the help
    Tags: None
    • hanasaku
      New Member
      • Mar 2022
      • 9
      • sweden
      #2
      Re: Yamaha RX-A1020 protect

      anyone can guide me?

      can be a floating ground i suspect, or a bad capacitor.

      thanks in advance.

        Comment

        • hanasaku
          New Member
          • Mar 2022
          • 9
          • sweden
          #3
          Re: Yamaha RX-A1020 protect

          i found something on the right channel, the resistor R1111 3 point 22ohm x2 just one side was ok, and the diode D1028 was open/Bad.

          i will check changing this .

            Comment

            • petehall347
              Badcaps Legend
              • Jan 2015
              • 4423
              • United Kingdom
              #4
              Re: Yamaha RX-A1020 protect

              check the output transistors .
              am guessing the resistors are 2x 0.22 ohms

                Comment

                • hanasaku
                  New Member
                  • Mar 2022
                  • 9
                  • sweden
                  #5
                  Re: Yamaha RX-A1020 protect

                  Originally posted by petehall347
                  check the output transistors .
                  am guessing the resistors are 2x 0.22 ohms
                  yes. one of the 0.22 ohms resistor fail, i already change and the diode but burn the transistors on the right channel .

                    Comment

                    • hanasaku
                      New Member
                      • Mar 2022
                      • 9
                      • sweden
                      #6
                      Re: Yamaha RX-A1020 protect

                      I suspect the problem is in the -LB signal because R1287 and Q1098 are extremely hot but they work, also the signal shorting the double resistor is the positive transistor Q1048P which is connected to the -LB_R

                        Comment

                        • hanasaku
                          New Member
                          • Mar 2022
                          • 9
                          • sweden
                          #7
                          Re: Yamaha RX-A1020 protect

                          This 2 components are hot even if i isolate the amp side , Its that normal?
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