Image-formation process
The image-formation process consists of seven steps divided into ve functional blocks.
Figure 1-12 Image formation process
7. Fusing
6. Separation
5. Transfer
Latent image formation
3. Laser beam exposure
Developing
4. Developing
Drum cleaning
8. Drum cleaning
1. Pre-exposure
2. Primary charging
Pickup
TransferFusing
Delivery
: Paper path
: Direction of drum rotation
: Functional block
: Step
Table 1-17 Image formation process
Functional block Steps Description
Latent image formation 1. Pre-exposure
2. Primary charging
3. Laser-beam exposure
An invisible latent image forms on the surface of the
photosensitive drum.
Development 4. Developing Toner adheres to the electrostatic latent image on the
photosensitive drum.
Transfer 5. Transfer
6. Separation
The toner image transfers to the paper.
Fusing 7. Fusing The toner fuses to the paper to make a permanent
image.
Drum cleaning 8. Drum cleaning Residual toner is removed from the drum.
Step 1: Pre-exposure
To prepare for primary charging, light from the pre-exposure LED strikes the surface of the photosensitive
drum to remove any residual electrical charges from the drum surface.
24 Chapter 1 Theory of operation ENWW
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