Latent Image Formation Block - Canon LBP2900 series Service Manual

Latent Image Formation Block

In this block, a latent static image is formed on the surface of the photosensitive drum.
step 1:Å@primary charging, in which the surface of the photosensitive drum is charged to a uniform negative potential.
step 2:Å@laser beam exposure, in which a latent static image is formed on the surface of the photosensitive drum.
2.Å@Development Block
In this block, toner is deposited on the static image formed on the surface of the photosensitive drum, thus turning it into a visible image.
step 3:Å@development
3.Å@Transfer Block
In this block, the toner image on the surface of the photosensitive drum is moved to print paper.
step 4:Å@transfer, in which the toner image is moved form the surface of the photosensitive drum to print paper.
step 5:Å@separation, in which the print paper is detached from the photosensitive drum.
4.Å@Fixing Block
In this block, the toner image is permanently fused to the print paper.
step 6:Å@fixing
5.Å@Drum Cleaning Block
In this block, the residual toner left on the photosensitive drum is removed for collection as waste toner.
step 7:Å@drum cleaning, in which residual toner is removed from the photosensitive drum.

2.4.1.3 Latent Image Formation Block

This block consists of 2 steps during which a static image is formed on the surface of the photosensitive drum.
At the end of the last step in this block, the area of the drum surface not exposed by the laser beam retains negative charges (dark area), while the area
exposed to the beam is rid of negative charges (light area).
The drum image formed by negative charges in this way is not visible to the human eye, hence the name "latent image."
step 1:Å@primary charging
Paper delivery
6.Fixng
Fixing block
Drum cleaning
7.
5.Separation
Transfer block
4.Transfer
Pick-up
0
-100
-500
Primary
charging
(step 1)
Electrostatic
Drum cleaning
latent image
block
formation block
1.Primary charging
2.Laser beam exposure
3.Developing
Developing block
Paper path
Direction of drum rotation
F-2-6
Exposed
area
Time (t)
Unexposed
area
Laser Transfer
beam (step 4)
exposure
(step 2)
F-2-7
Primary
charging
(step 1)
Chapter 2
0008-0103
2-7