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Yamaha pt300. was working fine. Now only makes loud humming noise which doesn't repsond to change in volume. Monitor display shows keys register as being played, but no sound can be heard except loud humming. ? Keyboard has been well taken care of and otherwise in excellent condiditon. could it be power connection, speakers blown out?

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Likely the power adapter has failed if it uses one. Try a new one first.

If half the rectifier blows out, a very impure DC voltage is applied which will be heard in the audio output.

Posted on Sep 29, 2009

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