Where can I buy a FC-300 RRC2 Board and connecting cable to repair a Roland foot controller?

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It looks like the cable terminates into a 1/4" stereo or 3 wire plug.

Best: I recommend going to Radio shack or an audio store and buying a 1/4" stereo plug/ with cable that has one end loose and attaching the loose end to your foot pedal. I do not know why it is stereo unless there are 2 pedals but if so ,you will need to determine which wire works on which pedal so leave pedal cover loose until you test it. I have replaced these before.
OK method: The cable can be spliced using solder and heat shrink to isolate the wires. Use probably 1//8 to 3/16" shrink for the wires and 1/4" to 3/8" shrink over the whole job. Keep each wire separate by color type.If the wire is too hard to twist it may be a special type that can be connected using terminal strips(radio shack has them) or use wire nuts and tape them.

Probably from Roland, however the cost would likely be almost the cost of a new unit. Best to look at repair. What is wrong with the unit?

R-C-L stand for right, center, left... On a standard piano, the RIGHT or "R" pedal is the "damper".

The other pedals are the soft and sostenuto The "Soft" is the LEFT pedal and the Sostenuto the center. The FC controller inputs can usually be configured by the user so you need to read in your user manual how to set those and connect whichever cable to the appropriate FC input.

Sorry, but Roland uses the opposite sense switch. They use normally closed where Casio requires normally open contacts. SOMETIMES one can rewire the pedal internally, but you have to be mechanically and electrically inclined to do that.

You just need the cables to connect the devices.

The answer is NO... Roland uses the opposite sense switches on foot pedals... They use NIRMALLY CLOSED and your Yamaha is a NORMALLY OPEN switch.

SOMETIMES you can open these pedals and find that the pedal has the opposite sense switch available and you only have to unsolder and move one wire to make it a NORMALLY CLOSED pedal.

You can get the connectors at DigiKey.com. They are a 6 pin DIN style.

The second line item here MIGHT be the connector:

http://www.mouser.com/Interconnects/Audio-Video-Connectors/DIN-Connectors/_/N-778d5?Keyword=connector&No=50&FS=True&P=1yzvtn8Z1z0yxti

Compare the specs to what you are mating with.

Hi - not sure if you found a solution to your question. One thing I found hunting around for a new rcc ( since my cable was stolen a few years ago and now I need it...of course) was another blog where the cable had "crimped" ; the user had cut out the bad section and spliced it.

You may want to test it, along each bit of length to see if your patch and bank switching enables to see if that's the problem.

I have a FC-200. I don't know by your post what you are trying to do but think of the pedal as a device that can alter a communication between two other devices or one device which transmits info which the pedal receives, alters and then transmits to whatever is on the receiving end. In this case your program. The pedal has to have sysex info transmitted to it or midi info such as a sequence etc. I use mine to control the parameters on my wind syth module. I go from midi out on the module to midi in on the pedal and from midi out on the pedal to midi in on the module. There is also a battery onboard that you might want to check that stores your pedals programmed parameters. Hope this helps.