Hello faithful Casio fans, I recently acquired a Casiotone CT-6500 at the customary rate of $1/lb, it had a problem with the audio cutting in and out or being scratchy and distorted but I fixed that by reseating a ribbon cable, however I have an interesting issue where a whole set of buttons and lights are completely inactive - the chord and rhythm sections mostly:
https://ibb.co/D1hNMyf
However I can trigger the drums from an external MIDI source and the tempo light between START/STOP and SYNCHRO blinks accordingly. I have a scope and meter, the boards look in pretty good condition but it would be nice to know a good place to start. Thanks!
