HP Color LaserJet Professional CP5220 Service Manual - Page 33
High-voltage power supply, formed on the photosensitive drum.
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High-voltage power supply The DC controller controls the high-voltage power supply to generate biases. Figure 1-9 High-voltage power supply TR1 high-voltage power supply Primary transfer bias circuit TRI-1 TRI-2 TRI-3 TRI-4 PRI-1 PRI-2 PRI-3 TRS2 DEV-1 DEV-2 DEV-3 DEV-4 PRI-4 Developing bias circuit Primary charging bias circuit DEV high-voltage power supply FG Secondary transfer bias circuit TR2 high-voltage power supply DC controller The high-voltage power supply (HVPS) applies biases to the following components: ● Primary charging roller: The primary charging bias is applied to the surface of the photosensitive drum to charge it uniformly negative as a preparation for the image formation. ● Developing roller: The developing bias is used to adhere toner to an electrostatic latent image formed on the photosensitive drum. ENWW Engine-control system 21