Horizontal Lines With 94Mm Pitch On A Halftone Image - Canon C5500 Series Troubleshooting Manual

Horizontal lines with 94mm pitch on a halftone image

For CE
Symptom
Horizontal lines with 94mm pitch [a] may occur when a halftone image is output.
The arrow [b] indicates the direction of feeding.
[Reference] In this symptom, the horizontal lines may occur as bunches of plural lines[c]/diagonal lines [d] / lines with dropped
part [e].
[Cause]
The inside of main body infinitesimally vibrates when the main body is operating.
The friction force of surface of the drum becomes uneven due to the vibration which the drum gets.
Therefore the several thousand paper feeding may make the difference of shaved surface condition of the drum.
Since there are different shaved conditions on the surface of the drum, uneven potential is generated at the each point and then
cause the foregoing symptom.
The shaved condition on the drum surface becomes even gradually with the advancement of life of the drum, and then the
symptom will be improved.
[Service work]
1) Select Settings/Registration > Adjustment/Maintenance > Maintenance > Clean Inside Main unit, and press "Start" button.
[Reference] The cleaning takes about 130 sec.
2) Output the image having shown the symptom, and check that the symptom does not occur.
If the improvement of the symptom is not sufficient, a couple of implementations of Procedure 1) are required.
3) Output the image having shown the symptom, and check that the symptom does not occur.
If the symptom does not improve, check other causes.
3