Image Formation System; Outline; Printing Process - Brother HL-2060 Service Manual

3.

IMAGE FORMATION SYSTEM

3.1

Outline

The image formation system is the main part of the printer. The print information, after
input from the video controller circuit into the engine controller circuit as a TVDO signal,
forms a toner image on the photosensitive drum.
Then the toner image is transferred onto the paper by the transfer charging roller. The
image formation system is composed of the photosensitive drum the charging unit, the
developing unit and the cleaning unit.
3.2

Printing Process

The major part of the image formation system is contained in the cartridge, as shown in
Figure 2.5.
Primary charging roller
Cleaning blade
Photosensitive drum
Static charge eliminator
The cartridge used by the printer has a seamless photosensitive drum with the structure
shown in Figure 2.6. The outer layer of the drum consists of an organic photoconductor
(OPC); the base is aluminum.
The printing process can be divided into five major stages:
1. Electrostatic latent image formation stage
Step 1 Primary charge (-)
Step 2 Scanning exposure
2. Developing stage
Step 3 Development
Laser beam
Blade
Transfer charging roller
Figure 2.5
Figure 2.6
II-5
Cartridge
Developing cylinder
Paper
Photoconductive layer
Base