I need to find replacement keys D-F-A for WK3700... Where can I go?!?!?!

Firstly take a look at the keys that are sticking. Are they leaning slightly to the left? The gap on either side should be equal, you should be able to slide a business card freely into the gap.

If they are leaning to one side it is a sure bet that the key has broken on the fixing under the bank of switches.

You will need to dismantle the keyboard and remove the broken key ( and the bit that has probably broken off ) and replace it.

Replacement keys can be found at www.beckettsmusic.co.uk if required. If you need further assistance contact via the links on the site.

You will need to gain access to the keybed, remove screw from back of keybed the fix it to the base of the keyboard. Slide the keybed back making a gap of about 2cm at the front of the keybed.

Look at the back of the key towards where it pivots and you will see a small arrow, push something like a credit card between the keys at this point and the key will pop up, you can then slide forward releasing the key.

If you need more info please ask.

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

Old reply so hopefully it's fixed. Dust or hair can get through the gaps and land on or near the contacts of the electronic key sensors. To be on the safe side (rather than doing a diy) take it in to the technicians. They'll have it fixed in a jiffy

Here's some links.https://www.google.com/search?q=korg+keyboard&aq=f&oq=korg+keyboard&sugexp=chrome,mod=0&sourceid=chrome&ie=UTF-8#hl=en&tbo=d&sclient=psy-ab&q=replacement+keys+korg+keyboard&oq=korg+keyboard+keys+replace+ment&gs_l=serp.1.0.0i8i13i30.43550.56800.0.59049.18.18.0.0.0.0.165.1688.14j4.18.0.les%3Bcesh..0.0...1.1.geeNjdPgveM&pbx=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&fp=142cd5af7754d791&bpcl=35466521&biw=1066&bih=532

Get replaceement keys from Yamaha America (musical instruments). Search Google for the phone number in California. You will need the model number and the key position that is broken and maybe the SN of your unit.
Download a service manual for instructions here: http://elektrotanya.com/yamaha_psr-e213_ypt-210_sm.pdf/download.html
When you go to this site DO NOT click on the download button but wait a minute for "Get Manual" to appear in the BOTTOM RIGHT and click on that link. You will get a PDF file of your SERVICE manual that has everything you need to understand how the keys are attached. BE VERY CAREFUL when opening the unit as there are tender ribbon cables between to two halves of the case. The manual probablly has a part number for the key in the parts list.

You would need to call casio for such parts or go to a part store which by googling it you can find the parts for this unit.

If you just want to record, use a cable with the proper ends to go from the stereo lineout jacks on your Casio into the soundcard line in on your computer. Use recording software such as Audacity. If you want to connect using Midi you will need an adapter such as this product:http://www.roland.com/products/en/UM-1EX/ You use it to connect the Midi In/Out jacks on your Casio to the USB port on your computer. Using midi opens up a world of possibilities. Please let me know if this helps.

Look for any drag of the key to the case or adjacent keys. Beyond that, the silicone rubber contact dome probably is damaged and needs replacing. Unit has to be opened and serviced. Parts are pprobably available from YamahaAmerica in CA.

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!