Latent-Image Formation Block; Step 1: Primary Charging; Figure 1-13 Image-Formation Process; Figure 1-14 Primary Charging - HP LaserJet Enterprise 700 M712 series Handbuch Zur Fehlerbehebung

Fuser system
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Step 6: Fusing
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Drum cleaning
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Step 7: Drum cleaning
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Figure 1-13
: Paper path
: Direction of the drum rotation
: Functional block
: Step
Delivery

Latent-image formation block

During the two steps that comprise this block, an invisible latent image is formed on the photosensitive
drum.

Step 1: primary charging

To prepare for latent image formation, the surface of the photosensitive drum is charged with a uniform
negative potential. The primary charging roller charges the photosensitive drum directly. The primary
charging bias is applied to the primary charging roller to keep a negative potential on the drum
surface.
Figure 1-14
Primary charging roller
24 Chapter 1 Theory of operation
Image-formation process
1. Primary charging
7. Drum cleaning
6. Fusing
Fusing
Primary charging
Photosensitive drum
Latent image formation
2. Laser-beam exposure
3. Developing
5. Separation 4. Transfer
Transfer
Developing
Pickup
Primary charging bias
ENWW