> Rob Jarratt >robert.jarr...@ntlworld.com> wrote: > I reverse engineered the schematic of the 12V output board. I >don't know if that would be of any use? How correct it is I don't know.
Sure, if you don't mind sharing. Everything helps. Looks like there are five separate PCBs in there. There's one long, skinny one that's obviously the AC input and rectifier board, which probably produces something like 300VDC for the regulator boards. There are two similar but not identical boards with huge heat sinks that are obviously the output regulators. I think this PS has +5, +3.3, +12 and -12 volt outputs, but I've no idea which board does which. And then there's a giant PCB, almost 11" square, covered with opamps, 74LS logic and discrete parts. There are filter caps, a transformer, and switching transistors on this board too so it obviously produces yet another power output for something. Oh, and I think this cabinet has variable speed fans, right? SO there's probably a fan speed controller on here as well. You'd think that will all this logic it could at least have some LEDs or something to tell me which output has failed, but it doesn't seem like it. Thanks Bob