Canon LBP-1120 Service Manual

Also see for Laser Shot LBP-1120: Specifications User guide Getting started guide

Contents

2 - 23CHAPTER 2IV. IMAGE FORMATION SYSTEMA. OutlineThe image formation system is the central hub of the printer, and consists of the photosensitive drum, developing unit,charging roller, etc.When receiving a pickup command from the interface controller, the engine controller drives the main motor torotate the photosensitive drum, developing cylinder, primary charging roller, and transfer charging roller.The photosensitive drum surface is uniformly applied with a negative charge by the primary charging roller. At thesame time, the drum surface is struck by the laser beam that has been modulated by the video signals. This forms alatent image on the photosensitive drum.The latent image formed on the photosensitive drum is developed into a visible image on the developing cylinderwith toner and then transferred onto print paper by the transfer charging roller. The residual toner on the photosensitivedrum surface is scraped off by the cleaning blade. The potential on the drum is made uniform by the primary chargingroller in preparation for another latent image.Figure 2-4-1Photosensitive drumPrimary charging rollerLaser beamTransfer charging rollerDeveloping cylinderInterfacecontrollerPCB/VDOVDOPRDVTREnginecontrollerPCB