Question about Yamaha PSR-295MS Portable 61-Key Touch-Sensitive Electronic Keyboard with Adapter and Stand
There are some keys which do not play. and some other keys, which while playing in touch mode sound extremely loud. Can you please tell me what the problem could be. Is it advisable that I open up the keyboard and clean all the dust? If yes, how can that be done..? I feel, that a lot of dust may have accumulated. Need your help. Thanks
Hi, This is probably due to worn rubber contacts. The sound is switched by pressing a key which in turns press a carbon contact on the PCB under the key. In time these wear out and need to be replaced.
Firstly open up the keyboard and locate the rubber contacts, check to see if each one is seated squarely, if they are not seat straight then this can create the problem you mention.
If all are OK then you will need to replace the strip which is causing a problem.
Spares are available from many sources including :
Posted on Jul 29, 2013
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Posted on Jan 02, 2017
There are 17 screws on the underside of the keyboard that need to be removed. The base cover can then be removed. This gives access to the keyframe assembly which can be removed.
Posted on Feb 08, 2009
SOURCE: Yamaha PSR-510 Keyboard
There is no need for a manual. It is so easy to operate because it is designed for easy opeating. If you need a manual to operate the PSR-510 then you really won't be able to operate it even after studying the manual. But here it is just in case you can by some miracle!
Posted on Feb 10, 2009
SOURCE: Yamaha keyboard not working
First thing is to verify the power supply voltage, including that on the board.
This can affect the threshold of the keyboard scanning and cause keys to not work although some other things appear to work.
Replacing that chip in the filed is not practical, so whole board would be considered the FRU. One can probably get one from Yamaha America parts in CA.
Before doing that, checking the scanning signals and feedback from the keys needs to be checked with a scope. Also verify that the analog power amp section is working.
Posted on Feb 25, 2010
That is NOT touch response, but velocity sensing. Each key has two contacts and one closes before the other to facilitate measuring the key velocity. In your case, it sounds like the key you are holding down has a bad disconnect diode in the key matrix and is holding the "first contact" signal true so the next key senses max closure speed. If you are not electronically adept, you need to take it in for servicing... however first tip the thing and vibrate it as some contamination MAY be shorting a line in the key matrix. Staples and paper clips are notorious problems with keyboards when they get into the key area.
Posted on Oct 31, 2010
Testimonial: "Thanks, I'll try shaking the keyboard as this suggestion is more consistent with the symptoms...the failure is not permanent. It come and goes. Thanks"
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