Yamaha CR2020

Discussion in 'Yamaha' started by Jacob Carter, Apr 18, 2018.

  1. avionic

    avionic " Black Knights " Subscriber

    Messages:
    41,563
    Location:
    Fort Dodge, Iowa
     

     

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  2. avionic

    avionic " Black Knights " Subscriber

    Messages:
    41,563
    Location:
    Fort Dodge, Iowa
    On top of each amplfier assembly there are two side by side solder lugs marked TP0 and E. Measure the DC voltage across these two lugs. DON'T short these two test points out with your meter probe or you will destroy output transistors if there not already bad. We are looking for zero volts +/- a few millivolts. Check both amp assemblies.
     
  3. avionic

    avionic " Black Knights " Subscriber

    Messages:
    41,563
    Location:
    Fort Dodge, Iowa
    This is the DC offset test point before the protect relay. If there is more than a few millivolts we have a problem.If not,then we have a power supply problem or a protect circuit issue.
     
  4. Alan NY

    Alan NY AK Subscriber Subscriber

    Messages:
    220
    Location:
    Stanfordville, NY
    That there is why I resubscribed.
    I have a CR 2020 that has been a problem child.
    Time to get busy.

    thanks avionic

    Alan
     

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