13. The copy has a soiled back.CHAPTER 11 TROUBLESHOOTING11-77COPYRIGHT © 1997 CANON INC. CANON NP6560/NP6360/NP6260 REV. 0 NOV. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CauseDevelopingassemblyCleanerassemblyFixing assemblyDeliveryassemblyChecksTurn off the power switch whilecopy paper is moving through thefeeding assembly. At this time, isthe back of the paper soiled?Does the problem occur atintervals of about 52 mm?Is the take-up mechanism of thefixing cleaning belt and thecleaning mechanism of the upperroller normal?Step123YES/NONOYESNONOYESActionGo to step 3.1. Clean the registrationroller.2. Clean the transferguide.3. Check the developingassembly for leakageof toner.1. Clean the feedingassembly.2. Check the cleanerassembly for leakageof toner.1. Check the take-upmechanism of thecleaning belt.2. Clean the upper rollerand the lower roller.3. Clean the fixingassembly inlet guide.Clean the delivery rollerand the separationclaws.