I just got done switching the power supply to work on 240v for this Casiotone 401 I got secondhand (of course).
So it makes sounds - there is some kind of damage in the keys of the drum machine part ... (chord accompaniment).
The sounds change with those buttons but the accompaniment part seems to be out of control. Maybe some issue with the tempo. Its playing notes randomly and super fast ... can't really play on top or notice much.
Anyway - any advice tracing. I understand electronics to the degree I can make a lot of things - but don't really have much experience tracing a fault or repairing this. I thought maybe I should unplug some of the control cables from the motherboard and see what happens.
Happy to submit a video if anyone is willing to suggest.
