Developing; Developing Bias Control - Canon imageRUNNER ADVANCE 8105 Series Service Manual

2
Technology > Image Formation System > Controls > Developing
<Control description>
The shutter is open or closed by the cleaning mechanism of the Primary Charging Wire.
The Primary Charging Shutter is made of fiber and usually taken up by the bobbin.
The drive of the Primary Charging Wire Cleaning Motor (M6) moves the Cleaning Pad to the
rear and the shutter taken up by the bobbin becomes extended to make the Shutter closed.
Because the Shutter comes between the Grid Wire and the Photosensitive Drum, discharge
products from the Primary Charging Assembly do not reach the Photosensitive Drum.
The Primary Charging Shutter Position Sensor (PS94) detects opening/close of the shutter.
Primary Charging
Shutter Sensor(PS94)
Primary Charging Wire
Cleaning Motor(M6)
Charging Shutter
<Related error code>
E060-0001 Primary Charging Shutter HP open error
E060-0002 Primary Charging Shutter HP close error
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Technology > Image Formation System > Controls > Developing
Grid Wire
Screw
Primary Charging Wire
Primary Charging Wire
Grid Wire
Photosensitive Drum
Charging Shutter
F-2-77 F-2-77
■

Developing

●

Developing Bias Control

To form a toner image on the Photosensitive Drum by charging toner on the Developing
Cylinder.
<Control description>
The developing bias (AC, DC positive), which has been generated on the Develop High
Voltage PCB (PCB12), 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 D-max control.
•
Developing AC bias
• The bias to improve image quality.
The bias value is fixed.
•
Developing High Voltage PCB(PCB12)
Developing Upper Cylinder
Photosensitive Drum
Developing Lower Cylinder
2-57
F-2-78 F-2-78
2-57