Lexmark CS748de, Service Manual

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3-64
Service Manual
5026
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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.