It's not a particularly good power supply - the L2 filter/coil is seriously under-rated (and/or insufficiently cooled, however you want to look at it) and this (plus the idle load resistor) cooked the output capacitors in mine - I'm waiting on new caps (& a different filter to experiment with) as i write this, so I don't know if mine has more trouble than that.
That said, it does seem very serviceable - simple one-sided PCB with through-hole components makes for super simple parts replacement, and the PCB even has a nice enough silkscreen with named components so you can find what I'm drawing in the schematic - if i bothered to name that particular component that is ... sorry.
This is the AC input all the way to the rectified mains caps. The most boring bit really. Not drawn: the 220/110V switch: it would in the 110V position connect one of the AC lines past the rectifier to the middle point of the caps.
This is the high-voltage side wiggly bits. I'll be honest and say that I don't (yet) really fully understand how this thing starts up (or some of the details of the controls).
This is how I've described the transformers in the PSU. W is named T2 on the PCB and Y is named T1. I don't really know why i decided to name their terminals Wx and Yx but what is done is done.
This is the first part of the low-voltage side logic - the bottom half of the TL494 chip and what it drives. I know my transistor orientation in the control drive section is funky, but sometimes you make some happy accidents.
This is the top half of the TL494-related circuitry - mostly what it senses.
Finally, the DC output section (and the feedback adjustment stuff).
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