12. The copy has white spots (horizontal).CHAPTER 11 TROUBLESHOOTING11-76 COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseDevelopingassemblyDrumCopy paperScanner rail,Scanner cableCharging wire,PhotosensitivedrumChecksIs the problem noted at intervalsof about 52 mm?Is the problem noted at intervalsof about 25 cm?Try fresh copy paper. Is theproblem corrected?Does the problem occur at thesame location on all copies?Are there scratches on the surfaceof the photosensitive drum?Step12345YES/NOYESYESYESYESNOYESAction1. Clean the developingrolls.2. Dry wipe the surfaceof the developingcylinder.3. If the surface of thedeveloping cylinderhave scratches,replace thedeveloping cylinder.1. Clean the drum.2. If scratches are found,replace the drum.The copy paper may bemoist. Advise the useron the correct method ofsorting paper.1. Check the scanner railfor foreign matter.2. Adjust the scannercable.Clean the chargingassembly.Replace thephotosensitive drum.
