Canon LBP 2460 Service Manual - Page 85

CHAPTER 2 Reference: If the image on the photosensitive drum is not completely transferred onto the paper due to jamming, 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 transfer voltage is set to negative to remove the toner with a negative charge from the transfer charging roller to the drum. The transfer charging roller is cleaned by removing the toner on its surface to the drum. Step 5 Separation Photosensitive drum Paper Static charge eliminator DC bias Transfer charging roller 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 temperature and humidity, the charge on the back of the paper is reduced by the static charge eliminator after transfer. 2 - 39