CHAPTER 11 TROUBLESHOOTINGCOPYRIGHT © 1999 CANON INC. CANON NP6512/6612/7120/7130/7130F REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)11-6013 The back of the copy is soiled.YES/NONOYESYESNOCause------------Transferguide assem-blyFeedingassemblyPickup guideassembly,DeliveryrollerStep123ChecksTurn off the power while copy paper ismoving through the feeding assembly.Is the back of the paper soiled?Is the transfer guide assembly soiled?Is the feeding assembly soiled?ActionGo to step 3.1. Clean the transferguide.2. Clean the registra-tion roller.3. Check the varistor.4. Check the develop-ing assembly forleakage of toner.Clean the feedingassembly.Clean the pickup guideassembly and thedelivery roller.12 The copy has white spots. (horizontal)YES/NOYESYESYESNOCauseCopy paperScanner railScanninglamp, Devel-oping biasStep123ChecksIs the paper of a recommended type?Try paper fresh out of package. Is theproblem corrected?Is the problem noted at the sameposition on all copies?ActionTry a recommendtype. If the results aregood, ask the user touse a recommendedtype.The paper may bemoist. Instruct the useron the correct methodof storing paper.1. Check the scannerrail for foreignmatter.2. Adjust the tensionof the scanner cable.Check the scanninglamp for flickeringand the presence/absence of a develop-ing bias.
