4. The copy has an uneven density (darker at front).5. The copy has an uneven density (lighter at front).CHAPTER 11 TROUBLESHOOTING11-70 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CausePrimarycharging wireDevelopingassemblyScannerPre-exposurelampDevelopingassemblyChargingassembly, CopypaperChecksPerform the Image AdjustmentBasic Procedure. Is the problemcorrected?Are the developing rolls of thedeveloping assembly firmly in con-tact with the photosensitive drum?Clean the scanning lamp, reflect-ing plate, side reflecting plate, mir-ror, lens, dust-proofing glass, andheat absorbing glass. Is the prob-lem corrected?Is the pre-exposure lamp flashingduring copying?Is the developing cylinder coatedwith an even layer of toner?Step12345YES/NOYESNOYESNONOYESActionEnd.Check the developingassembly locking unit.End.1. Replace the pre-exposure lamp.2. Replace the DCcontroller PCB.1. Clean the tip of theblade of thedeveloping assembly(dry wiping).2. Clean the surface ofthe developingcylinder.3. Check the toner insidethe developingassembly to see if it islevel.1. Clean all chargingwires once again, andcheck their height.2. Try replacing copypaper.
