Circuit Description
Primary-charging-bias generation A DC negative bias is applied to the surface of the photosensitive drum in each
imaging drum to prepare it for image formation.
Developing-bias generation A DC negative bias is used to adhere the toner to each photosensitive drum
during the image formation process.
Primary-transfer-bias generation A DC positive bias is used to transfer the latent toner image from each
photosensitive drum onto the ITB.
Secondary-transfer-bias generation Two DC biases—one positive and one negative—are used to transfer the toner
from the ITB onto the paper.
Static-charge-eliminator-bias generation A DC negative bias is used to reduce the electrical charge on the paper after the
secondary-transfer process.
Fuser-roller-bias generation A DC negative bias is applied to the fuser roller to remove any toner that
adheres to the roller after fusing.
Fuser bias
The product uses instant-on fusing. The fuser bias is dc positive for improved print quality. The fuser
bias circuit is located in the high-voltage power supply.
20 Chapter 1 Theory of operation ENWW
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