Image Formation System; Outline - Canon LBP-1000 Service Manual

CHAPTER 2
IV. IMAGE FORMATION SYSTEM
A. Outline
The image formation system is the central hub of the printer, and consists of the photosensitive
drum, developing unit, and charging roller, etc..
When a print instruction command is sent from the video controller, the engine controller dri-
ves the main motor to rotate the photosensitive drum, primary charging roller, developing cylin-
der, and transfer charging roller.
The primary charging roller uniformly applies negative charges to the surface of the photo-
sensitive drum. To form a latent image on the photosensitive drum, the laser beam modulated
by the /VDO and VDO signals is exposed onto 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 paper by the transfer charging roller.
Residual toner on the photosensitive drum surface is scrapped off by the cleaning blade. Then,
the potential on the drum is made uniform by the primary charging roller in preparation for the
next latent image.
Primary charging roller
Fixing film unit
Cleaner blade
Photosensitive
drum
Pressure roller
Video controller PCB
2 - 24
Laser beam
Blade
Static charge
eliminator
Transfer
charging roller
Print instruction command
Figure 2-4-1
Cartridge
Developing
cylinder
Cassette
pick-up roller
FV
PR
Engine controller PCB
TR
DEV
Multi-purpose tray
pick-up roller