COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR8500/7200 REV.1 AUG. 2001CHAPTER 6 TROUBLESHOOTING6-833.3.9 The copy has a black line (vertical, fine)Scanner (dirt)1) Does the problem occur only in copy images?YES: The cause is between the scanner and the CCD. Perform the fol-lowing:1. Check the standard white plate and mirrors for dirt.2. Execute the following in service mode:COPIER>FUNCTION>CCD>CCD-ADJ.Fixing system2) Using the door switch actuator, make copies with the front coveopen. Turn off the power switch while paper is in the feeding assem-bly, and check the image. Is the image normal?YES: The cause is after the fixing assembly. Check the following:1. Fixing assembly upper roller for scratches and black line2. Web for dirt3. Thermistor, separation claw for dirt, reciprocating movementPrimary charging assembly (dirt)3) Clean the primary charging assembly. Is the problem corrected?YES: End.Photosensitive drum cleaner4) Is there paper or foreign matter trapped on the cleaning blade ofthe cleaner assembly?YES: Remove the foreign matter, and clean the cleaning blade and thecleaner externals.5) Is there a scratch on the edge of the cleaning blade? (Put your fin-ger on the edge of the cleaning blade, and feel for a scratch.)YES: Use the edge that has not been used (If both edges have a scratch,replace the cleaning blade).Photosensitive drum, Developing assembly6) Is there a scratch or a black line in the peripheral direction of thesurface of the photosensitive drum?YES: Replace the photosensitive drum. If a scratch is found, be sure tofind out its cause.NO: Check the development system.
