Well, this is a new approach. A truly nice human being, BasementLoadSound has scanned in, and made an HD video of the complete Farfisa Soundmaker Service Manual which includes all of the schematics. Here’s his description:
Very rare and cool 1979 Farfisa Soundmaker service manual (Italian and English). Maybe the only one all over the world 🙂 I did my best to scan the pages but you have to watch the video full screen and possibly in HD resolution. Hope Soundmaker owners will find this document useful.