Basic Printing Principle - Brother HL-4040CN Service Reference Manual

3.4.2 Basic Printing Principle

The printing process consists broadly of 6 processes: Charging, Exposure, Development,
Transfer, Fusing and Cleaning.
1. Charging: The surface of the drum is electrically charged (Primary Charge).
2. Exposure: A printed image is formed on the surface of the drum by applying laser beam
(Electrostatic Latent Image).
3. Development: Toner is adhered to the surface of the drum (Visible Image).
4. Transfer: The toner on the surface of the exposure drum is transferred to the paper.
5. Fusing: The transferred toner is fused on to the paper.
6. Cleaning: Toner remaining on the exposure drum and belt unit is removed for recovery.
After these processes, the image is printed on the paper.
Charging
Exposure Transfer
Development
K Y M C
Fusing
Cleaning
Fig. Ref2-17
Confidential
Ref. 2-20