Canon imageRUNNER ADVANCE C3330 Series, Troubleshooting Manual, Page: 22 / 200

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Transfer Memory (Ghost)
[Symptom]
During printing text or lines of two solid colors (Red: Y+M/ Green: Y+C/ Blue: M+C), the background contained cyan halftone or
black halftone [A] when the drum had rotated one full turn (94mm), and white void ghost image [1] occurred in some instances.
In the combination of solid image of two colors and background color such as follows, the above mentioned symptom may occur.
- When there is text or a line of two solid colors (Red: Y+M) and also the background contains a cyan or black halftone.
- When there is text or a line of two solid colors (Green: Y+C) and also the background contains a black halftone.
- When there is text or a line of two solid colors (Blue: M+C) and also the background contains a black halftone.
Meanwhile, when the background contained cyan halftone or black halftone [A] after a full turn (94mm) of the drum with solid
white portion, a deep colored ghost image [2] occurred in some instances.
This symptom is less likely to occur when the background has no image [B] or is in high density [C].
The arrow [D] indicates the direction of feeding.
[Cause]
When paper is being fed, voltage is applied to the primary transfer roller. Thus, current flows from the primary transfer roller to
the drum.
The portion on the ITB where has a lot of toner such as two solid colors does not allow the current to flow easily from the primary
transfer roller to the drum as the toner works as resistance, on the other hand the portion where has a solid white image allows
the current to flow easily, so that there might be a difference between residual potentials on the drum depending upon the density
of image.
If there is a difference between residual potentials on the drum, the above mentioned symptom occurs after a full turn of the drum.
[Service Work]
1) Select Settings/Registration > Adjustment/Maintenance > Adjust Image Quality > Auto Adjust Gradation, and then press the
"Full Adjust" button.
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