Can Anyone Help me with my Yamaha C-35N Electone Organ?

About a week ago i got an old 1978 Yamaha C-35N Electone Organ, and i had a little jam on it and it all worked well but all the ons and switches weren't exactly the clearest, so i got out the Manual for it and was going over all the switches, and when i got to the wah pedal it said that there was a switch next to it to turn it off tucked away. So i was hooking my foot round to find this switch and then all off a sudden the organ started to crackle so i quickly moved away, and then smoke started to emerge from the keys so i turned it off and took out the plug. I haven't touched it since, anyone know what happened and/or how to fix it? Thanks in advance. - joey