Color Displacement In Sub Scanning Direction; New Item - Canon imagePRESS C7000VP Series Trouble Shooting Information

3.28 Color displacement in sub scanning direction

 Cause
The sliding load between the sintered bushing for grounding of the idler roller and the roller in
the ITB becomes large. Color displacement in sub scanning direction occurs due to uneven
rotation of the ITB caused by the change of the load.
 Field Remedy
Apply grease (Super Lube grease) to the sliding area between the sintered bushing and the
roller to reduce the load.
1. Release the ITB pressure lever to release the tension of the ITB.
(Up to this point, remove the parts around the ITB according to the normal procedure.)
2. Check the surface of the idler roller involved.
If there is a flat area of the roller due to abrasion, the idler roller needs to be replaced.
3. If there is any abnormality in other rollers than the roller [A], remove the ITB.
* If the only idler roller that has a problem in rotation is the roller [A], it is possible to
implement the following operation.
(It is unnecessary to remove the ITB.)
4. Remove the sintered bushing at the rear side of the idler roller.
* In the case of the roller [A]: If removing the rear grounding spring, the busing can
be removed.
* In the case of other rollers than the roller [A]: If removing the retaining ring at the
front side and the idler roller, the sintered bushing can be removed. (See the
photos below.)
In the case of [A]
Grounding spring
In the case of those other than [A]
Retaining ring
(there may be one location)
Trouble Shooting Information for C7000VP series
Page 90
-> New item
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［A
Sintered bushing
Rev. 2.0
2010/09/17