Canon LBP-2000 Service Manual download pdf (Page 76)

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CHAPTER 2

IV. IMAGE FORMATION SYSTEM

A. Outline

The image formation system is the core of the Printer, and consists mainly of a cartridge and a

fixing assembly.

When the video controller PCB sends the print signal (/PRNT) to the DC controller PCB, the DC

controller PCB drives the main motor (M101) to start rotating the photosensitive drum, developing

cylinder, primary charging roller, and transfer charging roller.

Thereafter, the primary charging roller charges the surface of the photosensitive drum to a

uniform, negative potential; a laser beam modulated according to video signals (/VDO, VDO) is

then directed to the surface of the Photosensitive drum to form a latent image.

The latent image is then turned into a visible image on the developing cylinder using toner; the

resulting visible image is then transferred to paper by the transfer charging roller.

The surface of the photosensitive drum is cleaned by the cleaning blade, which removes re-

sidual toner; it is then charged to a uniform potential by the primary charging roller to be ready for

a new image.

The cartridge of the Printer is equipped with a toner level sensor used to check the level of toner

and the presence/absence of the cartridge.

When the toner inside the cartridge drops below a specific level or the cartridge is not fitted to

the Printer, the fact will be communicated to the video controller PCB.

—Primary charging roller

Photosensitive

drum

Developing cylinder

Cartridge

Transfer

charging roller

Fixing

assembly

Laser beam

Video controller PCB DC controller PCB

/PRNT

/VDO

VDO

Fixing roller

Figure 2-4-1

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Canon LBP-2000 Service Manual Page 76