Confidential
Ref. 2-20
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.
CMYK
Charging
Exposure
Development
Transfer
Fusing
Cleaning
Fig. Ref2-17
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