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Did all those keys fail at once? If so, it's likely a simple fix, eg a single broken wire. Keys are usually wired on a grid array eg 25 columns x 3 rows.Pressing a key eg connects the 17th column to the 2nd row so the device knows which key it was. So if there is a broken wire to one of the rows, 1/3 of the keys will suddenly stop working.
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.
Hi, I’m repairing a casio cdp-220r for the same reason. The F3 key does not sound at all and some adjacent keys sound louder than the rest at normal play attack. I will have to replace the entire octave memebrane as I found that it was broken when I finally got access to it. See phot
There probably is NOT a fuse and usual cause is problem with the adapter or the power connectors. Broken solder of the connector in the keyboard is common. Broken cords on the adapter is common as well.
Open the unit CAREFULLY to avoid damaging cables between top and bottom. Inspect the defective keys. It may either be a broken part on the key OR the silicone rubber key contact carriers that can act as springs. Get repair parts from Yamaha America in California. Find number online and call the "parts department"
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.
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.
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