Canon iR C6800 Series Service Manual page 906

Chapter 13
<Step 2>
1) Set " 3" or " 4" to the following in service mode: COPIER>ADJUST>COLOR>ADJ C.
<Step 3>
1) Set " 1" or " 2" to the following in service mode: COPIER>ADJUST>COLOR>ADJ C.
Description
This symptom does not occur while the printer unit is used on its own.
This symptom tends to be most conspicuous when a C mono color image is copied. Although the CA 1 Text Chart,
in particular, is subject to this symptom, the degree of the symptom is not serious enough to cause practical problems
to the user.
13.3.2.3.7 Transfer Faults on Mono Color Prints
0006-3717
Cause
The machine executes primary transfer ATVC control at specific intervals when making mono color prints. When there
is a change in the environment, however, the machine can at times fail to execute the control, resulting in transfer faults.
Field Remedy
Perform the following work:
Execute the service mode item used to change the intervals of executing primary transfer control: i.e., set "1" to the
following: COPIER>OPTION>BODY>INTROT 1.
Description
In the case of color prints, the machine executes ATVC control for every job; as such, the output is of the symptom.
Image Sample
F-13-21
13-34