Hi, This and a lot of similar keyboards have gold flashed pads on the PCB and the keys press one or two rubber caps, with conductive pads in them, down.
Clean the pads with isopropanol, (and nothing else) and it will be cured 99% of the time. If a few notes do not work, especially after heavy use, then the rubber caps can be replaced.
Taking the keyboard apart is long winded because of the number of screws involved.
The job its self is simple enough, but take note of the order things go in and where the screws go.
Hope this helps, Chris.
SOURCE: My yamaha psr 420 has
Your key contacts have gotten dirty. Two contacts per key are used to sense velocity and if one doesn't work the sound will be full velocity and loud.
The contacts are conductive rubber "pills" in silicone rubber domes that the key presses down onto circuit board traces under the keys. Clean both the "pills" and the black portion of the circuit board GENTLY using ONLY 99% isoprophyl alcohol and QTips. There is a lot of disassembly required and one has to keep track of where the screws go and length and thread type to re-assemble after cleaning. Also great care must be taken to not damage the ribbon cablles connecting the top and bottom halves of the case.
SOURCE: No Sound
You didn't give any specifics. Possibly it is just broken due to a loose cable to the keyboard (which you could look inside and check) or a burned out semiconductor (harder to check).
If it is a MIDI keyboard, usually symptoms like this are due to a "MIDI Channel ID" problem. It is sending the keyboard on one MIDI channel and whatever is producing the sound is listening on another. For this sort of thing, you can substitute devices to narrow down the problem or try to reset everything, removing all the batteries, if any, and checking the manuals or website for reset instructions. Of course, you may lose stored settings that way.
SOURCE: yamaha pt300 keyboard. only make loud humming
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..
SOURCE: My Casio Px 330 keyboard
This is a problem with one of the two contacts for that key. The contacts close at different times as the key is depressed and the time it takes between is measured as velocity which is used to control the loudness as in a regular piano. The contacts are conductive rubber pills. After a lot of dis-assembly you can clean them with 99% isoprphyl alcohol and Q Tips. Clean both the pills and the circuit traces on the board they are pressed against. Be very careful of the ribbon cables between the halves of the case.
SOURCE: I Just bought Yamaha MM6,
Usually that is a programed feature, but you can try the support center at the manufactures website.
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