Service Guide OKIFAX 5750/5950Chapter 3 Brief Technical DescriptionPage: 1573.1 Fundamentals of the Electro-Photographic ProcessThe electro-photographic process involves six sub-processes:(1) Charging (2) Exposure (3) Development (4) Transfer (5) Fusing (6) CleaningOutline of each process is explained below.Process Illustration Description1 Charging The surface of theelectro-photographicImage drum is uniformlycharged with negative chargesby applying a negative voltageto the charge roller.When the applied DC voltageexceeds a threshold value,charging of the drum begins.2 Exposure Light emitted from the LEDhead irradiates the negativelycharged surface.The potential of the irradiatedpart of the Image drum surfaceis raised, so that anelectrostatic latent imageassociated with the print imageis formed.3 Development Toner is attracted to theexposed part (high-potentialpart) of the Image drum atthe contact between the Imagedrum and the developingroller, making the electro-staticlatent image visible.
