SOURCE: ricoh 1045 sc990
Generally changing the cylinder (blade and developer) Initialize td and id sensor usually it is solved. If it is not thus it proves the following thing: press point and numeral (enter) simultaneously for more than 10 seconds until this clear the service call. If the problem persists can be the hard disk, change.
SOURCE: sc990
sc 990 relates to the nv ram chip on the main board also check the values of the lazer unit are correct and not changed
SOURCE: I have A problem of SC990 in the ricoh aficio
The light copies and overtoning is probably caused by the developer going bad. Do you have a service contract on your copier? It's likely time for a whole PM (preventive maintenance) procedure.
The sc990 is probably caused by the copier's condition as well. Once you have the PM done (or at least replace the developer, rebuild the photoconductor unit, and clean or rebuild the transfer unit) the sc990 codes should go away along with the poor copy quality.
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