The primary charging roller charges the photosensitive drum directly. The DC negative bias is applied to the primary charging roller to keep a negative potential

on the drum surface.

Step 2: Laser-beam exposure

The laser beam scans the photosensitive drum to neutralize the negative charge on portions of the drum surface. An electrostatic latent image forms where the

negative charge was neutralized.

2.4.1.4 Development block

Toner adheres to the electrostatic latent image on the photosensitive drum, which becomes visible.

Step 3: Development

Toner acquires a negative charge from the friction that occurs when the developing cylinder rotates against the developing blade. When the negatively charged

toner comes in contact with the drum, it adheres to the latent image because the drum surface has a higher potential.

Unexposed area

2.4.1.5 Transfer block

During the three steps that comprise this block, a toner image on the photosensitive drum is transferred to the print media through the ITB.

Step 4: Primary transfer

The toner image on the photosensitive drum is transferred to the ITB. The DC positive bias is applied to the primary transfer pad. The negatively charged toner

transfers to the ITB from the drum surface.

2-4

Primary charging roller

Photosensitive drum

Unexposed area

DC negative bias

Exposed area

F-2-5

Laser beam

Exposed area

F-2-6

Developing cylinder