A tooth picker fall into the keyboard of a Yamaha YDP S-30. Can I open it and fix it by my myself? Or should I send it to somewhere to repair? Thanks

Suppliers here

https://www.google.com/search?q=yamaha+model+YDP+161+piano+board

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A YDP uses the same key type as a basic Yamaha Clavinova. As you have stripped the keyboard to reveal the keys take a look at the end where the key hinges. There will be an arrow pointing to one side. You will need to remove att the screws holding the key base (black plastic ) to the wooden base. Slide the whole keyboard back a couple of inches, push down where the arrow points between the keys, the offending key will pop up. Slide forward and jiggle out. Replace key. reassemble. If the tag on the back of the old key has snapped off remove the piece of debris that might be there before refitting.

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replacement keys can be found online

http://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=17431

There's an extremely comprehensive pair of videos about repairing this problem on YouTube thanks to David Allyn. I have embedded them below, or you can search "P70 Noisy Keyboard Repair".

Yamaha YDP223 :

YAMAHA YDP 223 223C PARTS Service Manual free download schematics eeprom...

Korg i3 :

KORG I2 I3 SM Service Manual free download schematics eeprom repair info...

On SOME Yamaha pianos, there is an electrolytic capacitor 1mfd/50v that becomes leaky and causes this. On those with the particular main board the capcitor is at location C94. On other pianos there are other caps that bypass the wire from the pedals that are ceramic. Likely one of these has shorted. There is also a possibility that the pedal contact has shorted. Test for this by unplugging the pedal cable. If it still sustains, then problem is internal. Unless you are adept at electronics this is NOT a DIY repair.

Yamaha keyboards can be prone to sticking keys due to the rear part of the key cracking around the return spring - if this is the case the only solution is replacing the affected key modules. However this problem generally only occurs with long term use by very physical players.
Otherwise the problem may be caused by a build up of dust / fluff between adjacent keys - try raking out the spaces with a thin piece of fairly rigid plastic (maybe a credit card might work?)

check manufacturers site or go to some .torrent sites i'm sure you will be able to find somewhere there

I have same problem. Do you have any solution?

I wrote up and photographed for my similar YDP, see solution 2 under this post:
http://www.fixya.com/support/t8881187-1_key_not_spring

have you tried using the can of air. you can get it at almost any drug store walmart or kmart. just spray the can of air between the keys and they should become unstuck.