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Re: ricoh cl4000dn toner bottle sensor
The toner bottle sensors don't go bad too often. Do you have an extra yellow toner bottle? Try replacing that first. Compare the tray where the yellow toner bottle sits to the other three colors, and make sure nothing where the toner bottle connects is broken or bent.
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Hi, the chip on those toner bottles stores information about how much toner is left, so once that chip registers an empty toner bottle, it won't work even if you attach it to a new toner bottle. You'll need the chip from a new toner bottle, or one that hasn't registered no toner.
sc 307 is a charge bias error having to do with the yellow photoconductor unit (PCU). Replacing the yellow PCU should resolve your problem. If the problem persists even with a new PCU, you will likely need to have either the high voltage supply board or the drum positioning plate replaced.
I just came across this post, you've likely solved it by now; However it is a "Toner density" error related to your cyan photoconductor. It is a defective connector. Replacing the cyan photoconductor should solve problem.