Image formation system The image formation system is the central hub of the printer. The system consists of the cartridge, transfer charging roller, and fuser unit. When a print command is sent from the formatter, the engine controller drives the main motor to rotate the photosensitive drum, primary charging roller, developing cylinder, transfer charging roller, and pressure roller. The primary charging roller uniformly applies negative charges to the photosensitive drum surface. To form a latent image on the photosensitive drum, the laser beam modulated by the video signals is exposed on the photosensitive drum surface.
The toner on the developing cylinder develops the latent image formed on the photosensitive drum into a visible image, which is transferred onto media by the transfer charging roller. The transferred toner is changed to a permanent image by heat and pressure in the fuser unit. The cleaning blade scrapes off residual toner on the photosensitive drum. The potential on the drum is made uniform by the primary charging roller in preparation for the next latent image.
Electrostatic latent image formation block 2.Laser exposure Paper path Rotation of drum 1.Primary charge Developing block 3.Developing Drum cleaning block 7.Drum cleaning fuser block 5.Separation 4.Transfer Transfer block Paper delivery 6.Fuser Registration Tray 1 pickup Cassette pickup Figure 39. Image formation system Print process The toner cartridge contains the cleaning, conditioning, and developing stages of the image formation process. These components are subject to wear and are built into the replaceable toner cartridge. This eliminates the need for a service call when replacement is required. 80 Chapter 5 Theory of operation C7058-90936