Canon LBP-800 Manual Do Serviço
IV. IMAGE FORMATION SYSTEM
A. Outline
The image formation system is the main part of the printer, and consists of the photosensitive
drum, developing unit, charging roller, etc.
The image formation system is the main part of the printer, and consists of the photosensitive
drum, developing unit, charging roller, etc.
When a pick-up command is sent from the interface controller to the engine controller, the
engine controller drives the main motor to rotate the photosensitive drum, developing cylinder,
primary charging roller, and transfer charging roller.
primary charging roller, and transfer charging roller.
The primary charging roller uniformly applies negative charge to the surface of the photo-
sensitive drum. To form the latent image with the laser diode on the photosensitive drum, the
laser beam modulated by the VIDEO signal is illuminated on the photosensitive drum surface.
laser beam modulated by the VIDEO signal is illuminated on the photosensitive drum surface.
The latent image formed on the photosensitive drum is changed to a visible image by the toner
on the developing cylinder and then transferred onto the paper by the transfer charging roller.
The residual toner on the photosensitive drum surface is scraped down with the cleaning blade.
The potential on the drum is made uniform by the primary charging roller in preparation for a
new latent image.
The residual toner on the photosensitive drum surface is scraped down with the cleaning blade.
The potential on the drum is made uniform by the primary charging roller in preparation for a
new latent image.
Figure 2-4-1
CHAPTER 2
2 - 22
Photosensitive drum
Primary charging roller
Laser beam
Transfer charging roller
Developing cylinder
Interface
controller
PCB
controller
PCB
/VDO
VDO
PR
DV
TR
Engine
controller
PCB
controller
PCB