Service Manual for OKIPAGE 8zChapter 2 Operation DescriptionPage: 142.5 Electro-Photographic ProcessThe electro-photographic process is outlined below:(1) Charging - The surface of the OPC drum is charged negatively and uniformly byapplying the DC voltage to the CH roller.(2) Exposure - Light emitted from the LED head irradiates the negatively charged surface ofthe OPC drum. The surface potential of the irradiated surface attenuates to form theelectrostatic latent image corresponding to the image signal.(3) Development and residual toner recovery - The negatively charged toner is brought intocontact with the OPC drum, adhering to the electrostatic latent image on the OPC drumby static electricity. This adhesion causes the electrostatic latent image to change to avisible image. At the same time, the residual toner on the OPC drum is attracted to thedeveloping rollerby static electricity.(4) Transfer - When paper is placed over the image drum surface, the positive chargewhich is opposite in polarity to that of the toner, is applied to the reverse side by thetransfer roller. The toner is attracted by the positive charge and is transferred onto thepaper. This results in the transfer of the toner image formed on the image drum onto thepaper.(5) Cleaning - The cleaning roller temporarily attracts the residual toner on the transferredOPC drum with static electricity, then returns the toner to the OPC drum.(6) Fusing - The transferred unfused toner image is fused to a sheet of paper by applyingheat and pressure to the image.Figure 2-5 shown below is a flow for the electro-photographic process.
