Hello. I collect audio equipment from the 1980s. Now I started collecting synthesizers. I recently bought a Casiotone 401 and a Casiotone 403. The Casiotone 401 starts up, there is noise in the speaker, the diodes next to the sound sectors light up, and the tempo note flashes. I think the sound production track is OK. I think that the amplifier input stage (preamplifier) or coupling capacitor has been damaged. The Casiotone 403 was connected to a 220V mains with the switch set to 110V. The mains transformer was probably damaged. I noticed that it has two power supplies (power stages). I don't know what voltage should be connected to the rectifier bridges (power supplies). Please help, service diagrams if you have them. Please send it to the following e-mail address: marekkrzyszton@gmail.com Regards. Marek.
