Recently picked up a very grubby but very functional unmodified korg poly 800 mk1. Love the sound of the filter :O Everything seems to work (all the keys/midi/buttons/other parameters) as it should, except for the chorus which will just not turn on. I've tried it in stereo, mono and headphones separately.
I've had a look under the hood and whilst it was quite dusty, I've cleaned that all out and can see no signs of battery acid leakage/damage and comparing to other online photos I can see no cosmetic damage. The top and underside of the chorus board looks perfectly intact and undamaged to my eyes.
I've reset to factory settings and got fresh batteries in there but no luck getting that chorus to turn on. Anyone have any ideas on whether I'm missing something simple here, happy to provide some up close picks of the internals if anyone has any ideas?