I don't have an SC200, but the chip you're looking for is most likely going to be one of the following:
I/C PIN
MC3361xx 9
MC-3359P 10
MC3371D 9
MC-3359P 10
SC8780P/MC3357P 9
NJM-3359D-A 10
TK-10421 11
TK-10489M 11
TK-10489-MTL 11
TK10931V 12
TK-10421M-2 11
CA3089N 6
LSC1359P 9
I did a SC150 many years ago, and if I recall correctly, it was real nice to work on - lots of room, and a perfect spot to mount the jack on top of the case right next to the speaker jack.