Canon iR C6800 Series Service Manual page 909

Chapter 13
Filed Remedy (cause 2)
1) Replace the primary transfer roller.
2) Dry wipe the rollers [1] and the scraper [2] shown in the following figure with lint free paper.
[1]
[2]
F-13-23
Memo:
When the primary transfer roller becomes worn, shavings from its surface will likely move on the intermediate
transfer belt to reach all rollers inside the intermediate transfer unit. The presence of shavings between the belt and
the rollers will hinder the movement of the belt, possibly causing displacement of color in sub scanning direction.
The shavings, in passing, have a high degree of viscosity, and tends to resist removal from the rollers.
13.3.2.4.2 Smeared of Colored Characters/Lines
0005-8556
Cause
When 2 color (blue, green, red) is used to form an image of characters or lines, an excess of toner deposit can cause
the layer of toner to grow too thick during the first transfer of the second color, thus leading to smears of toner
(character edges) on the intermediate transfer belt because of separation discharges.
Field Remedy
Execute the following service mode item to decrease the amount of toner that is deposited for individual colors:
set ' 3' to the following: COPIER>ADJUST>COLOR>ADJ Y
set ' 3' to the following: COPIER>ADJUST>COLOR>ADJ M
set ' 3' to the following: COPIER>ADJUST>COLOR>ADJ C
set ' 3' to the following: COPIER>ADJUST>COLOR>ADJ K
Note:
If the images are too light after the change, set the item to ' 1' to ' 2'.
When you have executed these items, be sure to execute auto gradation correction (full; image characteristics
corrective control) in user mode so as to maintain the optimum level of density.
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