I may be wrong, maybe they did publish schematics for their power supplies in their line of commodity test equipment, unlike the counters and function gens (eg. cfg-250, cfc-250) in the same line. The eBay auction does not show any schematics, though, although it suggests that they are included.
The eBay auction for the service manual shows one page of the adjustment section of the service manual, you may be able to infer the rest of it from the circuit board. It's not like it's going to be a terribly complex circuit with dozens of interacting adjustments.