I got fed up with not having a schematic for the power supply PCB of my 7075, so I reverse engineered it. The power supply schematic in the 7075 PDF, available on various websites, bears only a superficial resemblance to my unit. I have attached the schematic below, as it may be of help to other 7075 owners with the same power supply. No guarantees, there may be the odd mistake, but I think that it is pretty close.
It also gave me the chance to play around a little with KiCad, which I hadn't used before. I didn't use the current version, just V4.0.5 from the Debian Stretch distribution, so I expect I have missed out on a lot of functionality.