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Konica 7728 copy machine Error Code F28-3?

Does somebody have a Service Manual and can tell me what to do with this error? Best would be an indication how to get a complete service manual. I tried in all known http's, but they don't have it.
granhermano2, September 2009
Corona problem usually caused by dampness on high voltage corona units
remove corona units and dry out .

copytech, October 2009