How to remove keys Yamaha PSR-510

[LeoBoston]

I have an old psr-510 with 2 loud keys. I was going to clean the rubber contacts and the contact board but stuck with the keys removal. I took all apart down to the key bed, removed all screws on the top. I can’t find how to unlock the keys.

Can someone give me an advice?
Thank you in advance.

 

[Gourockian]

Here's a picture of the relevant page from the Service Manual. If you want the complete manual, which covers the PSR-410 & 510, you can download it from here: https://www.manualslib.com/download/1012157/Yamaha-Portatone-Psr-410.html

Good luck,

Al

 

[nakeyer]

Unfortunately - it is only 10% that you'll solve the problem only with cleaning the rubber contacts and the contact board because your instrument is rather old. Better to find the new rubber contacts... If the cleaning will not bring any effect - try to use the conductive glue (I bought it on AliExspress one day and repair my TV Remote). It will help you for some time...