Canon LBP-3260, Service Manual

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Reference:
If the image on the photosensitive drum is not completely transferred onto the paper due to jam-
ming, etc., the toner may adhere to the transfer charging roller. The printer removes the toner
from the transfer charging roller by switching the transfer voltage between positive and negative
in the specified sequence. During wait mode, initial rotation, and last rotation, the printer sets
the primary DC voltage to 0V to make the charge on the drum 0V. At the same time, the trans-
fer voltage is set to negative to remove the toner with a negative charge from the transfer charg-
ing roller to the drum. The transfer charging roller is cleaned by removing the toner on its sur-
face to the drum.
Step 5 Separation
Figure 2-4-11
The stiffness of the paper causes it to separate from the drum. Thin paper or curled sheets to
be duplex printed may not separate, but remain wrapped around the drum. To prevent this, a
negative bias is applied to the static charge eliminator to reduce electrostatic adhesion between
the drum and paper and facilitate separation.
To stabilize the paper feed system and prevent droplets on the printed image at low temper-
ature and humidity, the charge on the back of the paper is reduced by the static charge elimi-
nator after transfer.
2 - 39
CHAPTER 2
Paper
Transfer charging roller
Photo-
sensitive
drum
Static charge
eliminator
DC bias