HP LaserJet Pro M402d

Figure 1-11 Toner-level sensor
DC controller
Toner level
sensor
Table 1-9 Sensors
Abbreviation Component Replacement part number
Toner-level sensor
The image-formation process consists of ten steps divided into ve functional blocks.
Figure 1-12 Image-formation process
: Paper path
: Direction of drum rotation
: Functional block
: Step
Pickup
Delivery
Fusing
Transfer
Drum cleaning
Developing
Latent image formation
6. Fusing
5. Separation
7. Drum cleaning
1. Primary charging
2. Laser beam exposure
4. Transfer
3. Developing
20 Chapter 1 Theory of operation ENWW