Don't have a schematic, but for what it's worth, I fixed my 35665A power supply solely by inspection. In my case, the thing blew a fuse immediately
and was already drawing 2A when I supplied 8VAC into it via a Variac. It's a bit of a pain to disassemble, but an ohmmeter showed shorts in the main
switching transistor, the driving transistor, three 1N4148s and three 5.6V Zeners. Quite a bit of carnage, but all easily replaced, and it fixed the unit.
So open it up, look for burnt parts, shorted parts, the usual stuff.