Yamaha CR 2020 41Vdc on outputs!

Discussion in 'Solid State' started by Mid-Fi, Sep 12, 2017.

  1. Mid-Fi

    Mid-Fi AK Subscriber Subscriber

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    I did while I had the board out they are replaced as pictured.

    upload_2017-9-13_19-0-29.jpeg

    +230mv R1

    Curious if lifting R1 would allow the relay to close and Left channel to play.

    And yes confirmed +41 on both channels
     
  2. Mid-Fi

    Mid-Fi AK Subscriber Subscriber

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    No idea how to diode test. In or out of circuit. Will scan YT for video
     
  3. avionic

    avionic " Black Knights" Subscriber

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  4. mbz

    mbz Well-Known Member

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    808
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    Melbourne, Victoria
    Plenty of good posts on how to diode test as per avionic above.
    I like this one from markthefixer who updated a graphic from echowars.
    Red/black refer to probe orientation.

    DiodeTest.JPG
     
  5. mbz

    mbz Well-Known Member

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    808
    Location:
    Melbourne, Victoria
    Right In (yellow wire) is higher than LI, problem with right channel. TR611 and maybe TR612 are prime candidates, however certainly check outputs
    (TR613,4).

    If left channel dc offsec is below threshould then relay should activate. If this is just a solder connection then ok to try, but carefully secure
    this floating wire. If this is a wire wrap connection then don't tinker.
     
  6. Mid-Fi

    Mid-Fi AK Subscriber Subscriber

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    Gotcha. I'll dig in as the opportunity arises.
     

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