CHAPTER 11 TROUBLESHOOTINGCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 11-6319 The copy has horizontal fogging.YES/NOYESYESNOYESNOCauseScanninglampDrum unit,High-voltagetransformerassemblyScanningsystemFeedingsystemStep123ChecksDoes the scanning lamp flicker?Replace the drum unit. Is the problemcorrected?Make a reduced copy, and compare itagainst one made in Direct. Is theproblem found at different positions?ActionReplace the scanninglamp.End.Check the high-voltage transformer(composite powersupply PCB).Check the scanningsystem.Check the feedingsystem.20 The copy has poor sharpness. (out-of-focus)YES/NOYESYESNONOYESNOCause------------OriginalLensMirrorpositionScannerDrum unitStep12345ChecksIs the image also too light?Is the original off the copyboard glass?Turn off and then on the power switch.Does the lens move smoothly?Is the horizontal ratio in Direct withinspecification?Clean the scanning lamp, reflectingplate, mirror, and lens. Is the problemcorrected?ActionCorrect the lightimage problem first.1. Check thecopyboard cover toosee if it happens tobe warping.2. Instruct the user onthe correct methodof placing originals.Check the lens rail forforeign matter, andclean it.Adjust the distancebetween No. 1 mirrorand the No. 2 mirror.End.Replace the drum unit.
