The jack uses three wires because it supports TRS (Tip-Ring-Sleeve) type ΒΌ" jacks as well as standard TS (guitar) jacks.
To best see which wires go to which posts, it's easiest to find a TRS type jack and unscrew the cover to see the configuration.
If you can't find one, keep this general principle in mind:
Typically, the ground wire is black and is soldered to the main body of the connector, and the remaining wires are soldered together as one to the other post.
SOURCE: Can I replace the pedal unit to the Yamaha Clavinova CVP-75?
I can't solve the problem, but just wanted to sympathize because I have the same problem. My pedal is broken on my Yamaha Clavinova cvp85a. It worked wonderfully for years but finally it broke.
I'd be in the market for buying a new pedal or fixing the old one. But I've not found any suggestions in any of these forums for either solution.
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