Canon iR4570 Series Service Manual page 713

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14.2.1.2.2 White lines appear in sub scanning direction on solid black and halftone images: Foreign

substances adhere to edge of Feeder Guide

iR2270 / iR2870 / iR3570 / iR4570 / iR3530

[ Inspected by Canon Inc. ]

As a result of inspection, it was found this symptom occurred because foreign substances on the edge of the feed

guide of the developing assembly came into contact with the surface of the drum. If the symptom occurs, clean the

feed guide referring to the Service Manual [Maintenance and Inspection > Cleaning > Cleaning the Developing

Assembly Spacer, Feed Guide, Dust-Blocking Glass and Fixing Inlet Guide].

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