Ricoh FW780 Service Manual - Page 29

3. Development The magnetic developer brush on the development roller comes in contact with the latent image on the drum surface. Toner particles are electrostatically attracted to the negatively charged latent image areas. 4. Pre-Transfer Lamp The pre-transfer lamp (PTL) illuminates the drum prior to image transfer. This reduces the attraction between the toner and the drum, thus making image transfer easier. 5. Image Transfer Copy paper is fed to the drum surface, at the exact timing, to align the copy paper and the developed image on the drum surface. Then a strong negative charge is applied to the back side of the paper. The negative charge pulls the toner particles from the drum surface onto the paper. 6. Paper Separation A strong ac corona discharge is applied to the back side of the copy paper, reducing the charge on the paper and breaking the electrostatic attraction between the paper and the drum. Then, the stiffness of the copy paper causes it to separate from the drum. The pick-off pawls help to separate paper which has low stiffness. 7. Cleaning The cleaning blade, which is angled against drum rotation (counter blade system), removes any toner remaining on the drum surface. 8. Quenching The light from the quenching lamp electrically neutralizes the surface of the drum. A163 1-5 SM