Block 2: Developing Toner adheres to the electrostatic latent image on the photosensitive drum. Step 3: Developing Toner acquires a negative charge from the friction that occurs when the developing cylinder rotates against the developing blade. The negatively charged toner is attracted to the latent image on the photosensitive drum surface because the drum surface has a higher potential. The AC bias that is superimposed with the developing negative DC bias is applied to the developing cylinder. Figure 1-18 Developing Blade Developing cylinder AC bias Exposed area Unexposed area Unexposed area Exposed area DC bias Photosensitive drum 24 Chapter 1 Theory of operation ENWW