Yamaha B-20BR Support Question
Yamaha B-20BR Support Question
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Question posted by nfalberts42 on October 7th, 2015
Yamaha B-20br Organ
Master oscillator checked with oscilloscope operation correct mixer outputs correct, signal injected on preamp and main amp good amplification therefore works correctly. Still not operative on upper, lower or pedal keyboards. also all wiring correct variable pots and switches fine. Any suggestions or solutions will be appreciated
Current Answers
Answer #1: Posted by hzplj9 on October 7th, 2015 6:57 AM
hzplj9
Member since:
June 25th, 2012 Points: 4,875,690
Member since:
June 25th, 2012 Points: 4,875,690
Sounds like you have knowledge of servicing. I would suggest taking a look at the power rails on the the power supply as if one has failed which supplies the pedals etc then that would cause your dilemma. It could be due to a failing capacitor on the board and without a service manual to identify the relevant supply it is a case of methodical checking.
Hope that helps.
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