COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001CHAPTER 6 TROUBLESHOOTING6-863.3.12 The copy has white spots (horizontal)Developing assembly1) Does the problem occur at intervals of about 58 mm or 79 mm?YES: Perform the following:1. Clean the developing members.2. Dry wipe the surface of the developing cylinder.3. If a scratch is found on the surface of the developing cylinder,replace the developing cylinder.Drum2) Does the problem occur at intervals of about 340 mm?YES: Perform the following:1. Clean the drum.2. If a scratch is found on the surface of the drum, replace thedrum.Paper3) Try fresh paper. Is the problem corrected?YES: The paper is moist. Advise the user on the correct method of stor-ing paper (place).Scanner rail, Scanner cable4) Does the problem occur only in copy images?YES: Perform the following:1. Check the scanner rail for foreign matter.2. Adjust the tension of the scanner cable.Charging wire5) Does the problem occur at even intervals?YES: Clean each charging wire.Photosensitive drum6) Is there a scratch on the surface of the photosensitive drum?NO: Clean the charging assemblies.YES: Replace the photosensitive drum.
