Canon iR4570 Series Service Manual page 718

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14.2.1.3.2 Soiled Image Leading Edge

iR2270 / iR2870 / iR3570 / iR4570 / iR3530

This problem occurs when paper moves between the photosensitive drum and the transfer roller. When the

photopositive surface comes close to or into contact with the toner-coated surface of paper, the toner layer can

become shifted toward the trailing edge of the paper. This problem tends to be conspicuous when the toner layer is

relatively high against the width of lines (about 0.2 to 0.6 mm) and, in addition, when the lines are at a right angle to

the feed direction (axial direction of the photosensitive drum).

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