Canon MF4690 Service Manual - Page 69
Configuration, 1.2 Print Process - printer toner
UPC - 013803076820
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6.1 Overview/Configuration Chapter 6 6.1.1 Configuration 0016-1839 The image forming system is the core part of this machine, and is composed of the cartridge, the transfer charging roller, the fixing assembly, etc. When receiving the print command from the SCNT board, the DCNT board activates the main motor to rotate the photosensitive drum, the developing cylinder, the primary charging roller, the transfer charging roller and the pressure roller. The surface of the photosensitive drum is evenly charged negative by the primary charging roller, and the laser beam converted with the video signal (VDO, /VDO) is reflected to the surface of the photosensitive drum to form the latent image by the laser diode. The latent image formed on the photosensitive drum is turned visible with the toner on the developing cylinder and is transferred on the paper by the transfer charging roller. The transferred toner turns into the permanent image on the paper when the heat and pressure are applied there at the fixing assembly. The cleaner blade removes the residual toner on the surface of the photosensitive drum, whose potential is made even by the primary charging roller to be ready for the formation of the next latent image. Fixing film area Cleaner blade Primary charging roller Photosensitive drum Transfer charging roller Laser beam Blade Laser / scanner block Developing cylinder Cartridge Video signal VDO /VDO PR1 TRS DEV DCNT board Print command SCNT board F-6-1 6.1.2 Print Process 0016-1840 The print process shows the basic operation process for image formation by the printer. The print process of this machine has the main 5 blocks and 7 steps. The toner image is formed on papers by following the steps of each block. The following is the outline of the blocks and steps of the print process. Delivery Fixing block 6. Fixing Drum cleaning block Electrostatic latent image formation block 7. Drum cleaning Transfer block 5. Separation 4. Transfer 1. Primary charging 2. Laser beam exposure Pick-up 3. Devel opment Developing block Flow of paper Direction of drum rotation F-6-2 1) Electrostatic latent image formation block Electrostatic images are formed on the photosensitive drum. Step1: Primary charging (Charges negative potential evenly on the surface of the photosensitive drum) Step 2: Laser beam exposure (Forms electrostatic images on the photosensitive drum) 2) Developing block Put the toner on the electrostatic latent image on the surface of the photosensitive drum to visualize Step 3: Development 3) Transfer block 6-1