Developing Bias Control - Canon imageRUNNER ADVANCE C350 series Service Manual

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2
Technical Explanation > Image Formation System > Controls > Drum Unit (Developing/Drum)
● Developing Overview/ Drive Configuration
Developing Cylinder
Developing Cylinder Clutch
(Y/M/C/Bk)
CL01
CL02
M03
CL03
CL04
Developing Motor
ATR Sensor (Y/M/C/Bk)
(UN34-UN37)
Parts name
Developing Assembly
To develop toner fed from the Hopper Unit to the Photosensitive
Drum.
Developing Cylinder
The toner and carrier inside the Developer Container are supported
on the surface and the toner is developed on the Photosensitive
Drum.
Developer Feed Screw A
Toner and carrier in the Developer Container are supplied to the
Developing Cylinder.
Developer Feed Screw B
Toner and carrier in the Developer Container are stirred and
supplied to the Developer Feed Screw A.
Parts name
M03
Developing
To rotate the Y/M/C Developing Cylinder and the Developer Feed
Motor
Screw.
UN34 to UN37 ATR Sensor
To detect the ratio of developer (toner + carrier) in the Developing
(Y,M,C,Bk)
Assembly.
2
Technical Explanation > Image Formation System > Controls > Drum Unit (Developing/Drum)
Developer Feed
Developer Feed
Screw B
Screw A
F-2-76
Function
T-2-25
Function
T-2-26
● Developing bias control
A toner image is formed on the Photosensitive Drum by attaching toner to the Developing
Cylinder.
Control description
The developing bias (AC, DC negative), which has been generated on the Developing
High-voltage PCB (UN06), is applied to the Developing Cylinder.
• Developing DC bias: The bias to generate potential difference with the Photosensitive
Drum.
The bias value is determined based on the Environment Sensor (UN33).
• Developing AC bias: The bias to improve image quality.
DC Controller PCB (UN04)
Developing High-voltage PCB (UN06)
Developing Cylinder
2-59
F-2-77
2-59

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