HP LaserJet Pro Color MFP M476dw - Page 37

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ITB cleaning
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Drum cleaning
Figure 1-10 Image-formation process
Latent image formation
Transfer
Fuser
ITB cleaning
Photosensitive drum cleaning
Development
Pickup
Registration
5. Secondary transfer
6. Separation
7. Fusing
Delivery
4. Primary transfer
2. Laser beam exposure
3. Development
8. ITB cleaning
9. Drum cleaning
1. Primary charging
: Media path
: Direction of drum rotation
: Block
: Step
Latent-image formation stage
During the steps that comprise this stage, a latent image is formed by applying a negative charge to the
photosensitive drum. You cannot see this image on the drum.
Step 1: primary charging
A high-voltage DC bias is applied to the primary charging roller, which is made of conductive rubber and is in
contact with the drum surface. As the roller moves across the drum, it applies the negative charge to that
surface.
Figure 1-11 Primary charging
DC bias
Photosensitive drum
Primary charging roller
ENWW Image-formation system 17