http://www.thevintageknob.org/technics-SU-V707.html
Oh, "microchip" bias circuit...
I wouldn't touch it myself. If Dr Dan couldn't fix it, I'm not sure there's much to be done. Lots of older IC's and custom power pack IC's are no longer in production.
My best advice would be to join audiokarma.org and ask around in there if anyone knows how to fix. Possibly cheaper in the long run to ship it to someone that can repair it. Considering replacement cost for a working unit of the same model, it's not really cost effective unless it has some sentimental value.