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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 :
guys i am using psr s 550b for 2years,,.and the problem was i stopped useing it for 2 months ....and when i started using it again my keys r not working only the styles r playing ....and i thought to do format since the keys r not working i am enable to format it ple tell me any solutions for it .ple.pleeeeeeeee
Hi, i think you can. You can go to any of the Yamaha companies around you area and explain to them the problem of the keyboard. They will give you good and quality replacement part for your Keyboard.
Make sure you go to only Yamaha company to avoid getting a wrong part for your Keyboard.Avoid road siderepairsforissue like this,it's more complicated to handle
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