Yamaha CS80

I've got two keys on my CS-80 that are not responding to aftertouch.

I'm wondering if it actually might be the wiring. Here's what happens.... when I press the key by itself no aftertouch..... when I press it in combination with other specific keys it will respond to aftertouch at the speed (vco speed) of the other key. Any ideas?

stephen

I've got two keys on my CS-80 that are not responding to aftertouch. What is the procedure to disassemble and get to the aftertouch sensors and check them?

Thanks,

Lift up card rack.

Remove screws on left and right side of keyboard plywood platform.

Slide keyboard platform back (goes about 1/2 inch).

Remove two metal bars over keys.

Remove plastic key contact cover from back of keys (snaps off).

Remove keys. Note, you have to remove black keys next to any white keys

you want to remove. Black keys are easy - but be careful around switch

contacts at back of key. White keys need more careful work to get from

lip out from under metal edge. You'll likely have to remove a whole

octave of keys.

Once keys are out, you can see rubber aftertouch sensors along front of

keys. They are in strips of 7 for white keys and 5 for black keys. To

take apart, remove the two screws. The white, nylon frame will come

off, and then the 5 (or 7) rubber pads will be loose.

However, I'd first stick a volt-meter from ground to the appropriate

wire coming off the sensor (should be obvious which is which). Just

push on the rubber pad with your finger and see if the voltage goes up.

Check a good one first for reference.

If this is good, then it's not the sensor, but something in the wiring

or the circuit boards. If it's not, try taking apart the sensor and

cleaning the contacts under the rubber pad with a q-tip and alcohol.

Don't do any of this if you're not comfortable with this kind of thing.

I provide no warranty!

Good luck!

David