Horizontal Line Caused By Impact From The Developing Rotary - Canon iR C6800 Series Service Manual

Chapter 13
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13.3.2.6.6 Horizontal Line Caused by Impact from the Developing Rotary

Cause
When a full color print is made, the vibration from the movement of the developing rotary affects the laser exposure
mechanism, at times resulting in a horizontal line in the output.
Field Remedy
Perform the following to adjust the target contrast potential of individual colors:
1) Generate test prints (COPIER>TEST>PG>TYPE=1).
2) Decrease the target contrast of the color in which the line is conspicuous.
change the setting to ' 30' in service mode (COPIER>ADJUST>V CONT>VCONT Y).
change the setting to ' 30' in service mode (COPIER>ADJUST>V CONT>VCONT M).
change the setting to ' 30' in service mode (COPIER>ADJUST>V CONT>VCONT C).
3) Once again, generate test prints (COPIER>TEST>PG>TYPE=1); then, check the output against the output
generated in step 1). If there is no improvement, go to step 4).
4) Decrease the target contrast potential of the color in question further in service mode:
change the setting to ' 50' in service mode (COPIER>ADJUST>V CONT>VCONT Y).
change the setting to ' 50' in service mode (COPIER>ADJUST>V CONT>VCONT M).
change the setting to ' 50' in service mode (COPIER>ADJUST>V CONT>VCONT C).
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