have you checked in the links in the Schematic links thread in Mods & Tech?
Some pedals just don't seem to have schematics available.
Try a Google images search, Sometimes you will be surprised at what is there, that is near impossible to locate, that some Spider-Bot found buried way too deep on someones site.
Keep is informed of your efforts.
Can I ask why you need the Sch? Is your SOD faulty?