HP 2605 Service Manual - Page 72

Latent image formation, Step 1: Primary charging

Page 72 highlights

The principal process of image formation is described here. The print process can be broadly divided into five stages with seven steps. A toner image is formed on paper as it goes through each process. The following figure illustrates the stages and steps of the print process as follows. 1. Electrostatic latent image formation stage Forms an electrostatic latent image on the photosensitive drum. Step 1: Primary charging Step 2: Laser beam exposure 2. Developing stage Makes the electrostatic latent image on the photosensitive drum surface visible by applying toner. Step 3: Development 3. Transfer stage Transfers a toner image on the photosensitive drum onto paper. Step 4: Transfer Step 5: Separation 4. Fuser stage Fuses the toner image on paper. Step 6: Fuser 5. ETB cleaning stage Cleans the residual toner on the photosensitive drum. Step 7: ETB cleaning Latent image formation This stage consists of two steps and forms an electrostatic latent image on the photosensitive drum. When the last step in this stage is completed, a negative electrical charge remains in the unexposed drum surface area by the laser beam and is removed from the exposed area. The image with negative charge on the drum is called an "electrostatic latent image", and it is invisible to the human eye. 62 Chapter 4 Operational theory ENWW

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The principal process of image formation is described here. The print process can be broadly divided
into five stages with seven steps. A toner image is formed on paper as it goes through each process.
The following figure illustrates the stages and steps of the print process as follows.
1.
Electrostatic latent image formation stage
Forms an electrostatic latent image on the photosensitive drum.
Step 1: Primary charging
Step 2: Laser beam exposure
2.
Developing stage
Makes the electrostatic latent image on the photosensitive drum surface visible by applying toner.
Step 3: Development
3.
Transfer stage
Transfers a toner image on the photosensitive drum onto paper.
Step 4: Transfer
Step 5: Separation
4.
Fuser stage
Fuses the toner image on paper.
Step 6: Fuser
5.
ETB cleaning stage
Cleans the residual toner on the photosensitive drum.
Step 7: ETB cleaning
Latent image formation
This stage consists of two steps and forms an electrostatic latent image on the photosensitive drum.
When the last step in this stage is completed, a negative electrical charge remains in the unexposed
drum surface area by the laser beam and is removed from the exposed area. The image with
negative charge on the drum is called an “electrostatic latent image”, and it is invisible to the human
eye.
62
Chapter 4
Operational theory
ENWW