● Fuser system ◦ Step 6: Fusing ● Drum cleaning ◦ Step 7: Drum cleaning Figure 1-13 Image-formation process Latent image formation : Paper path : Direction of the drum rotation : Functional block 2. Laser-beam exposure : Step 1. Primary charging Developing 3. Developing 7. Drum cleaning Delivery Pickup Fusing Transfer Latent-image formation block During the two steps that comprise this block, an invisible latent image is formed on the photosensitive drum. Step 1: primary charging To prepare for latent image formation, the surface of the photosensitive drum is charged with a uniform negative potential. The primary charging roller charges the photosensitive drum directly.
The primary charging bias is applied to the primary charging roller to keep a negative potential on the drum surface. Figure 1-14 Primary charging Primary charging roller Photosensitive drum 24 Chapter 1 Theory of operation ENWW 6. Fusing 5. Separation 4. Transfer Primary ch arging bias