Yamaha TSR-7810 receiver power drift

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  • ponteley
    New Member
    • May 2020
    • 4
    • USA
    #1

    Yamaha TSR-7810 receiver power drift

    Apparently same as RX-V681/RX-V781/RX-A760/RX-A860

    Everything working fine when plugged in and turned on.
    Output voltages on all speaker terminals are few mV.
    As time goes by (10-20 minutes), FR chanel goes to 10mv>100mv>200mv>300mv and up to 3V and then PROTECTION kicks in.

    Very strange issue. Can't find anything blown/overheating/shorted/open.
    All diodes and transistors checking out OK. Resistors too.

    Can't find service manual or schematic....

    Any help is greatly appreciated.
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8199
      • Canada
      #2
      Re: Yamaha TSR-7810 receiver power drift

      You got any high resolution pictures to show?

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