Found this site today while looking for a schematic...
http://www.eserviceinfo.com/ (http://www.eserviceinfo.com/)
A whole bunch of good stuff in there, I had a good look at the Playstation SCPH-7500 service manual...
http://www.eserviceinfo.com/downloadsm/188..._SCPH-7500.html (http://www.eserviceinfo.com/downloadsm/18807/Sony_SCPH-7500.html)
Please post a link if you find any other console/interesting schematics in that mess of information!
Thanks.