3-80 Service ManualThis discharge/no discharge process creates an invisible, electrostatic image on the surface of the drum. Thisimage is called a latent image.DevelopmentThe toner contained within the PC Cartridge has an electrical property that causes it to adhere to thedevelopment roll. The Metering Blade spreads the toner into a very thin layer on the development roll. Frictionbetween the development roll and the CM Blade development roll generates a small electrical charge that istransferred to the toner.The surface of the developer Roll is made up of a thin sheet of conductive material. The HVPS supplies thedevelopment Roll with two voltages: a DC voltage and an AC voltage. The DC voltage is used to transfer tonerfrom the development roll to the surface of the drum. The AC voltage agitates the toner on the developmentroll, making toner transfer easier.The development roll maintains a negative DC electrical potential. Negative charged areas of the drum have alower electrical potential, or higher relative negative value than the development roll. Discharged areas of thedrum have a higher electrical potential, or lower relative negative value, than the development roll. Adischarged point on the surface of the drum now appears less negative in relation to the negative charge onthe development roll.The toner adhering to the development Roll is always in contact with the drum surface. When a less negativepoint on the drum (a discharged area) comes in contact with the more negative charged toner on the MagnetModulatedLaser Beam0VDRUMDrum SurfaceImageDrum SurfaceVoltageLaser BeamDischargeLevelInvisible Latent ImageLaser BeamPrinthead
