Question about Yamaha Music

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Yamaha pt300 keyboard. only make loud humming sound. Keys register on monitor when touchedas do change in song etc...but no sound other than humming.

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Mine is like this so I think im just gonna buy a new one.

Posted on Jul 16, 2013

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  • Yamaha Master
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If the unit uses a wall transformer, make sure you have the right unit.

The Yamaha correct ones are branded Yamaha. Use of the wrong one can damage keybooard or be inoperative.

The PT300 did not come up as a valid keyboard. Suspect the number is either YPT-300 or a P-300..

Posted on Sep 28, 2009

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Posted on Jan 02, 2017

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I have a Yamaha PSR-S700. Recently, the touch sensitivity in one of the keys stopped working. Very little pressure applied would cause the note to sound as if the touch sensitivity was off completely. Now...


You MAY be confusing touch sensitivity with VELOCITY sensing. Touch sensitivity is PRESSURE put on AFTER the note sounds that causes modulation. VELOCITY is what is used for example to control the loudness of pianoo notes depending how fast they are struck. VELOCITY sensing is done by using TWO contacts at every key... one closes first. IF one of these gets dirty, FULL velocity will be sensed and it will be LOUD. The contacts can be cleaned using ONLY 99% isoprophyl alcohol and Qtips after MUCH disassembly of the keyboard. The contacts are conductive rubber pills in silicone rubber domes. Clean boththe contacts and the circuit traces they pres down onto.

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We have a Yamaha keyboard YPT-330 note E and F sharp not working why?

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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...


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.

Sep 27, 2009 | Dean Dimeblade Tribute Electric Guitar

1 Answer

Keyboard not working


from what you say the humming is caused by large capasister which maybe leaking so could well be a power supply falt
or mabe dry wire
o/c on audio maybe
you need engineer freind

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Yamaha psr-240 lights up but no sound.. no sound from head phones either. Seems to be working with exception of sound out..


try placing your ear on the speakers, adjust the volume control up and down several times, you should hear a humming sound that goes up and down. if not problem with the stage before the amplifier, that is the sound processor. if you dont hear the hum. problem with the amplifier and speakers, including the sound ports or jack. dissassemble the unit. look for loose connections from speakers to amplifier.

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I'm sorry but it sounds like you will have to have it repaired professionally.

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I had similar problem out of the box; fixed by setting Function to Style Volume and adjusting upward.

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Hi, BHOWDY.
Probably the best thing to do is call the Yamaha service center nearest you. I live in the Los Angeles area, and the Yamaha service center closest to me is in Buena Park. I called them on the phone and told them what the problem was, and they knew immediately what parts were needed and they shipped them out that same day.
The contacts that seem to wear out the fastest are the ones near the middle of the keyboard. On my CLP-170, it's the keys between middle C and the G above that -- probably no more then 4 or 5 keys. However, I ordered replacement contacts for all 88 keys because once you take the piano apart to replace the contacts, you may as well replace all of them.
Good luck, Howard

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