Canon imagePRESS C7000VP Series, Trouble Shooting Information

Page: 77 / 137

Trouble Shooting Information for C7000VP series
Page 77
Rev. 2.0
2010/09/17
[5]
3.14
3.7mm Pitch Banding

Symptom
Due to abrasion of the photosensitive drum cleaner drive gears or the like, 3.7mm banding
image may occur.

Cause
The photosensitive drum drive gears do not engage well because of abrasion, and this caused
vibration. This results in uneven drum rotation and causes 3.7mm banding image.
This symptom also occurs due to soiled gears or contaminants.

Field Remedy
1. Check the sliding performance of the gears.
In a heavy sliding condition, there may be foreign objects on the shaft and inner
circumference of two types of gears [3] and [4].
In this case, clean the shaft and inner circumference with lint-free paper containing alcohol.
4. If the problem is not eliminated after performing the foregoing procedure, replace the
photosensitive drum cleaner drive gear [5].
[1] Developing assembly
[2] Drum cleaner motor unit
[3] 32T gear FU6-0474
[4] 26T/26T gear FU6-0473
[5] 16T/55T gear FU6-0304
5. If the problem still occurs, try performing the procedure in 2.9 Noise from around
developing drive assembly/Cracked developing drive gear .
Image Sample