Developing stage Print cartridge Step 3 : In the print cartridge, the developing cylinder transfers toner onto the electrostatic latent image on the photosensitive drum. Figure 1-19 Print cartridge Blade Developing cylinder AC bias Exposed area Unexposed area Unexposed area Exposed area DC bias Photosensitive drum Toner acquires a negative charge from the friction that occurs when the developing roller rotates against the developing blade. The developing bias is applied to the developing roller to make a potential difference between the developing roller and the photosensitive drum.
The negatively charged toner is attracted to the latent image on the photosensitive drum because the drum surface has a higher potential. 28 Chapter 1 Theory of operation ENWW