Streaked Image Or Spots On An Image Due To Contamination Of The Primary Charging Wire And The Dustproof Filter - Canon imageRUNNER ADVANCE 8105 Series Manual

Symptom
Streaked image or spots on an image due to contamination of the primary charging wire and the
dustproof filter
[Inspected by Canon Inc. ]
Description
In the paper feed direction, streaked image [a] or spots [b] appeared on an image.
The sample below shows an enlarged view of a part of test print PG TYPE1. The arrow [A] indicates the
paper feed direction.
Cause
The dustproof filter [1] was clogged with dust etc., resulting in contamination of the surface of the primary
charging wire.
Since the primary charging wire was not uniformly contaminated, discharge current was increased at a
portion not contaminated. This increased the drum surface potential, resulting in the symptom.
pg. 98