HP Enterprise CC490A manual 7High-voltage power supply circuits, Circuit Description

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 1-4High-voltage power supply circuits

Primary transfer	High-voltage power supply T	Secondary transfer
bias circuit		bias circuit

Primary transfer roller

ITB

Secondary transfer roller

DC controlle

Print cartridge

Developing bias	High-voltage power supply D	Primary charging
circuit		bias circuit

The high-voltage power supply contains several separate circuits.

Table 1-7High-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