I need to repair a sticky key on a P120. Is there a repair manual?

If it's an ivory piano key just clean it a bit underneath with sand paper then glue it down with aquadhere and sticky tape until set.

Yamaha FC4 and FC5 sustain pedals are normally closed, sorry Fred. Roland is opposite. I suspect the P120 just needs to be reinitialized. Hold down top white key (C) while turning on power. Wait 3 seconds and then release white key. Should now be reset to factory spec. Always plug the pedal in before you turn it on. If it still doesn't work check it with a meter.

Not sure what you mean by sticky... If sticky to the touch, clean them carefully with a soft cloth wetted with Windex and then dry with dry cloth.

If the keys stick down, check if there is clearance from the board in front of them. If they are dragging here, you may need to have the keyboard adjusted to have adequate cleance. This is not an uncommon problem that can happen due to warping or humidity and temperature changes.

Drag a business card between the front of the keys and the front rail to check for clearance.

These are sold online at Kraft Music

Yamaha WB53080R Music Rest
Replacement Music Rest for P120, P140, P155, PF500, PF1000

call up Yamaha. They will fix it for free as it is a manufacturing fault.

Just bought a P120 from craigslist. A computer recycle company was selling it as parts for $150. They said it has the SCN error code and the keys don't play. It played the demos only.. Payed $100; took it home, opened it up & found the keyboard plug had detached from the motherboard. Plugged it in & BAM! It works just fine.

Many of thee synths use conductive rubber contacts. These "pills" are within silicone rubber "domes" that ALSO serve as the restoring force for the keys.

Your synth will have to be opened and the nature of the problem investigaated and cured. It will LIKELY require a repair part/parts.

If you are not familiar with electronics and the care necessary with the cabling within these synths, you best take it to a repair shop.

The parts should be readily available.

you may not need to open it up.
try using a wax based furniture polish on the keys, it will leave a layer to act as a lubricant between the keys.

I've had the very same problem twice so far. The only solution I figured is to simpy purchase an equivalent key (contact Yamaha service in your country for this) and to replace the broken one. The reason why the key doesn't work smoothly as the other one is not dirt therefore any cleaning won't help. The key is cracked deep in the place where it's attached to its 'axis'. So you'll need to remove all the screws and unmount the cover (it needs a sideshift to open once the screws are removed), be careful with the speaker wires. However you'll need firm moves anyway. Opening is tricky and gets me surprised anytime I do it so you'll need some courage :). Replacing the key is even more tricky. You'll have to remove the broken one by pulling it horizontaly (use some force, it's broken anyway). Placing a new key you'll need to uplift the 'hammer' and then slide a new one. I'm sure you'll figure it out once you see it with your own eyes (it's really hard to decribe but not so hard to do it). Hope you'll do fine. I haven't tried glueing the crack for I doubt it would work for long. Good luck!

Hi. I saw this looking for info on the C3500 of which I own one myself. I don't know the answer to your question but I found a site where you may buy a downloadable c350 service manual for $45. Go here, http://www.musicparts.com/products.asp?Company=Korg.

Regards,
/Mats Rahm
Sweden.