Two of the keys have no sound when press
Dead keys on Yamaha PSR e413 keyboard: Flip keyboard upside down, remove cover screws (use marked cardboard template to remember where they came out), spray suspect key-contacts with fast-drying contact cleaner, (usually a PCB with a matrix of contacts under keys), re-assemble base cover, wiggle faulty keys as far as possible to 'scrub' any dirt or oxidization. If this cleaning trick doesn't work, get a pro to check it.
SOURCE: i have yamaha PSR-i425 keyboard.can i conect it
Yes. You will need to have a MIDI interface on your OC and also select in the sounds control panel of windows that you are using the external synth. The MIDI will expect the PSR to respond to the "general MIDI" assignments.
SOURCE: Instruction manual for a Yamaha PSR 195 keyboard.
Try going to http://www.yamaha.co.jp/manual/english/index.php. There, you can try to find your owners manual for free.
SOURCE: How do I take apart Yamaha PSR-280 keyboard to clean keys.
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.
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!
http://www2.yamaha.co.jp/manual/pdf/emi/english/port/PSR510E.pdf
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