COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 11 TROUBLESHOOTING11-69C. Troubleshooting Image Faults1. The copy is too light (halftone only).CauseScannerDevelopingassemblyDevelopingassemblyLamp regulatorDC controllerPCBChecksPerform the Image AdjustmentBasic Procedure. Is the problemcorrected?Clean the standard white plate,mirror, lens, and dust-proofingglass. Is the problem corrected?Are the rolls of the developingassembly in firm contact with thedrum during copying?Is the developing cylinder coatedwith an even layer of toner?Replace the lamp regulator. Is theproblem corrected?Step12345YES/NOYESYESNONOYESNOActionEnd.End.Check the developingassembly locking lever.Check the developingassembly.End.Replace the DCcontroller PCB.
