Canon imageRUNNER 2270 Service Manual page 569

Chapter 14
14.2.1.2.3 Horizontal Line/Blurring at Intervals of 94 to 95 mm
0007-7091
<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 cleaning blade forcing itself against the surface of the photopositive
drum and increasing the friction.
<Field Remedy>
Make about 10 copies of the Test Chart.
<Image Sample>
14-11