Dear colleagues, our GP-500 started behaving strangely: when I release the sustain pedal for a fraction of a second and press the pedal down again, for the next one or two seconds the sustain is still off. And all of sudden, it starts sustaining again correctly.
When I release the sustain pedal for a longer period of time (1 s is already enough) and then press it, the sustain is there immediately after pressing the pedal.
There is no external equippment connected to the piano. No modifications have been performed on the frimware. Since the purchase the piano has been working flawlesly until now.
So this has very probably nothing to do with the wiring or the mechanics of the pedal switch itself. As an electronics guy I’d guess there is a trouble in the electronics for the electr. debouncing of the pedal switch.
Will be thankful for any tipps/tricks!