Lexmark C520 Service Manual - Page 122

5022-xxx High voltage power supply (HVPS) Provides a high voltage charge to: • The charge roll located in the photoconductor unit • The photoconductor drum located in the photoconductor unit • The toner adder roller (TAR) located in the toner cartridge • The developer roll located in the toner cartridge • The doctor blade located in the toner cartridge • The four transfer rolls located in the transfer belt Printhead assembly The printhead receives control and image data from the system card (RIP). Through the use of a laser unit, the printhead irradiates the photoconductor drum with light and creates an invisible image called a latent or electrostatic image. Photoconductor unit The photoconductor unit consists primarily of a charge roll and the photoconductor drum. The charge roll charges the surface of the photoconductor drum to prepare it for the latent image "drawn" by the laser. Once the photoconductor drum has been written to by the laser, it is responsible for picking up toner from the cartridge developer roller and then transferring the image to the print media. Toner cartridge This unit consists primarily of the developer roll and the toner adder roll. The primary function of this unit is to supply charge toner to the photoconductor unit for transfer onto the print media. The toner adheres to the electrostatic image on the surface of the photoconductor drum which is then transferred to the print media. Fuser The fuser assembly uses heat and pressure to fuse the toner image onto the print media. Diagnostic aids 3-45