Found this while looking for a replacement for the Sony chip, its from a Japanese Mac SE/30 Site, already translated into English.
http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html#SimasiMac
Scroll down a bit to Solutions, and then 5, ad then 6 just below it.
http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html#SimasiMac
Scroll down a bit to Solutions, and then 5, ad then 6 just below it.