I had a machine that was throwing SC670 on startup. A ribbon cable and multiple boards later the SC code still existed. The problem was narrowed down to connector CN203 on the Imaging IOB board, then further narrowed to the "ID Chip" PCB:TCB (Yellow). The PCB:TCB was swapped with another color (Cyan) but the problem remained with (Yellow). After ruling out a pinched/shorted wiring harness, I remembered there is small "chip" on the toner bottle. So we finally removed the toner bottle (Yellow) and the problem went away entirely. Put the bottle back in and it the SC670 came back. Swapped the bottle with a good one and problem solved. There happened to be some sort of defective "chip" on this particular toner bottle. Hope no one ever has this problem, but if you do maybe this will help.
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