I have a WK-3500 and it's a beautiful synth, though lately I've had a problem with it. The right speaker doesn't seem to produce any sound at all, and this has only happened recently. At first I thought it was the speaker itself, but plugging headphones in to the keyboard produces no sound out of the headphone's right speaker, either.

Now, I've tried resetting all the settings, unplugging it, everything you'd think to do to fix this (at least, unless i'm missing something obvious...) Does anyone have any idea what might be wrong here? I'm really at a loss for ideas and its a very irksome problem...

First do a system reset(restoring to factory defaults). If that does not fix it try plugging your line outs to your stereo. If it only happens on the onboard speakers and headphones then likely it is in the power amp circuit. Regards, calvero