Broken key I have a broken D key. Is it hard to replace?

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.

the contact rubbers might be broken or the rubber itself is wornout because of usage or there is dirt in it.. its lose its touch response, the best easient way is to replace the contact rubber.

Clean or replace the rubber contact pads.

This depends on "how" they are "broken".

Many of the keyboards with semi-weighted keys get the keys knocked out of the pivot points and one has to open the unit and reseat the key and/or the key spring retainer.

If the keys have broken parts, replacement is the only option.

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.

SOMETIMES the keys are not really broken, but instead knocked out of their pivot arrangements. Technics is out of business and you MAY have a hard time finding replacements. I believe they were bought out by Panasonic. You will LIKELY have to get parts for this, if available, through an instrument repair shop.

I might suggest taaking it to a shop and see if they MIGHT be able to swap the keys with ones you don't use.

They SHOULD be able to disarm them so it is at least playable.

Be forewarned that SOMETIMES excess forces on the keys from dropping CAN crack the circuit board onder the keys and that can be fatal and require board replacement, if available.

Call Roland to get replacement parts. Go to the Roland website and go to Support/parts.

The interdigitated fingers are circuit traces coated with a very hard, non wearing, carbonized type conductive surface. If a board crack runs through this carbonized area, that is FATAL. Replace the circuit board.
Realize that these contacts drive high impedance CMOS circuitry so the contact resistance is often in the 200 to 1000 ohm range.

The silicone rubber domes contain a conductive rubber pills, often two of them. One contacts the fingers before the second and the time difference between those is the measure of "velocity".The silicone dome acts as the restoring force for the key.

The keyboard is scanned as a matrix. Strobe lines intermittently select the first and then the second of the finger patterns, ONE octave at a time. The octave, 12 notes worth, are read in parallel one at a time.

The diodes are "disconnect diodes" which preven sneak paths when more than one note is held that are in different octaves.

Not sure of the keys in your synth, but MANY of them have a couple of tangs that come forward from the key and catch on a rail at the front to hold the key from coming up too far. THESE CAN GET BROKEN or slip past the rail if abused.

So check the front of the keys for any signs of something breaking off.

If it has, POSSIBLY you can attach something to replace the broken tangs. Gkluing on the old broken ones will not work. They will soon break off.

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!