HP CP4525DN Laser CC494A#ABA manual Primary transfer, Secondary transfer

Step 5: Primary transfer

The positively charged primary-transfer rollers contact the ITB, giving the ITB a positive charge. The ITB attracts the negatively charged toner from the surface of each photosensitive drum, and the complete toner image transfers onto the ITB.

Figure 1-17Primary transfer

Primary transfer bias

Primary transfer roller

ITB

Photosensitive

drum

Step 6: Secondary transfer

The paper acquires a positive charge from the secondary-transfer roller, and so it attracts the negatively charged toner from the surface of the ITB. The complete toner image transfers onto the paper.

Figure 1-18Secondary transfer

Secondary transfer

opposed roller

ITB

Paper

Secondary transfer roller

Secondary transfer bias

26 Chapter 1 Theory of operation ENWW