http://gona.mactar.hu/Commodore/monitor/Commodore_monitors_by_model_number.html
Does not look like the schematic is going to turn up. The link above might give
you a reasonable substitute to look for.
This website seems to confirm that there is a schematic in the manual. If there isn't one floating around on the internet, then perhaps there might be someone here who might be kind enough to scan/photograph it if that is allowed?