Developing Bias Control - Canon imageRUNNER ADVANCE C255 Series Service Manual

Parts name
Developing Assembly
Developing Cylinder
Developer Feed Screw A
Developer Feed Screw B
Code
M03 Developing Motor
UN34 to UN37 ATR Sensor (Y/M/C/Bk)

■ 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.
Developing Cylinder
■ Drum Overview
The toner fed from the Hopper Unit is developed on the Photosensitive Drum.
The toner and carrier inside the Developer Container are coated on the surface, and the toner
is developed on the Photosensitive Drum.
Toner and carrier in the Developer Container are supplied to the Developing Cylinder.
Toner and carrier in the Developer Container are stirred and supplied to the Developer Feed
Screw A.
Parts name
To rotate the Y/M/C/Bk Developing Cylinder and the Developer Feed Screw.
To detect the ratio of developer (toner + carrier) in the Developing Assembly.
DC Controller PCB (UN04)
Developing High-voltage PCB (UN06)
Primary Charging Roller
Role
Photosensitive Drum
Cleaning
Screw
Cleaning
Blade
55
2. Technology
Role