Horizontal Line/Blurring At Intervals Of 94 To 95 Mm - Canon iR4570 Series Service Manual

F-14-3

14.2.1.2.3 Horizontal Line/Blurring at Intervals of 94 to 95 mm

0007-7091
iR2270 / iR2870 / iR3570 / iR4570
<Cause>
The coefficient of friction on the surface of the photosensitive drum where the edge of the cleaning blade remains in
contact tends to change, causing uneven rotation and thus blurring.
This problem tends to occur during the initial period of use (less than 10K), when the coefficient of friction is
relatively even, or when a halftone image is generated after leaving the machine alone for 1 to 2 days. This problem,
on the other hand, tends to disappear when about 10 printouts are made.
This problem can also occur when the drum unit is taken out of and put back in the machine, with the edge of the