I really appreciate this forum. I'm new to learning keyboard not but not music. I have several guitars. I too picked up an old CT-6500 and when inspecting it, I should it and heard something pop around. I came home and discovered that the drum kit doesn't work. So, me, being impatient on my super dirt cheap purchase, decided to take it apart. I found a lonely 1 amp /250 V fuse bouncing around. I don't see a location for it. Is this the fuse that might control the drum kit and such? Also you say there is a coin type battery, but I only found one, but it's not easy to remove. Is this it in the pic?
pics attached.
Again, I appreciate anything anyone can add to this old topic.
https://imgur.com/gallery/jwiDql1