Yamaha M80 repair

Discussion in 'Yamaha' started by bobok7787, Dec 19, 2018.

  1. bobok7787

    bobok7787 New Member

    Messages:
    28
    Thanks for the reply!

    I did readjust bias to 15 mv immediately after powering on with output transistors installed. It adjusts accurately and remains stable after warm up. The OTOvoltages above are with both channels adjusted to 15 mv after warm up.
     

     

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  2. avionic

    avionic " Black Knights " Subscriber

    Messages:
    45,571
    Location:
    Fort Dodge, Iowa
    Pull one leg or R152 and check the resistance. Should be 220Ω.
     
  3. avionic

    avionic " Black Knights " Subscriber

    Messages:
    45,571
    Location:
    Fort Dodge, Iowa
    Also check R136 and 138. Both should be 1KΩ.
     
  4. avionic

    avionic " Black Knights " Subscriber

    Messages:
    45,571
    Location:
    Fort Dodge, Iowa
    Also need to check R234. ( 470Ω )
     
  5. brutal

    brutal YamaHoarder Subscriber

    Messages:
    4,460
    Location:
    Parker, CO

    You'll get there.

    LOL @legendary. He was't even mitigating the DSBG until someone pointed it out to him. ;)
     

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