High-voltage power supply The DC controller controls the high-voltage power supply to generate biases. The high-voltage power supply delivers the high-voltage biases to the following components used to transfer toner during the image-formation process:
● Primary-charging roller (in the cartridge) ● Developing roller (in the cartridge) ● Primary-transfer roller ● Secondary-transfer roller Figure 1-4 High-voltage power supply circuits Primary transfer bias circuit High-voltage power supply T Secondary transfer bias circuit Primary transfer roller ITB DC controller Secondary transfer roller Print cartridge Developing bias circuit Primary charging bias circuit High-voltage power supply D The high-voltage power supply contains several separate circuits.
Table 1-7 High-voltage power supply circuits Circuit Description Primary-charging-bias generation The primary charging bias negatively charges the surface of the photosensitive drum to prepare for image formation. The primary-charging-bias circuit in the high-voltage power supply generates the biases for each color. Developing-bias generation The developing bias adheres toner to an electrostatic latent image formed on the photosensitive drum. The developing-bias circuit in the high-voltage power supply generates the biases for each color. 10 Chapter 1 Theory of operation ENWW