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Toner Cartridge / Developing Unit Main Unit Theory of Operation
2-34
II Composition/Operation
7.2.5 Developing bias duty control (compensation control of the maximum
amount of toner sticking to the Transfer Belt)
• This control corrects to achieve the target amount of toner sticking to the Transfer Belt to
form the solid image.
• The duty control may be either the simplified correction or complete correction.
• The developing bias duty control is performed integrally with other control items by the
image stabilization control.
• The developing bias duty control is performed when there is a request made for execu-
tion of image stabilization sequence.
☞ 2-120
A. Simplified correction control
1. The duty value for detection is calculated from the previous setting value.
2. The detection pattern of each color of toner is produced on the Transfer Belt using the
calculated duty value for detection.
3. The detection pattern is detected by the AIDC Sensor.
4. If the detected value for at least any one color of toner varies by a predetermined value
or more from the duty value set through the last complete correction control, the simpli-
fied correction is first made and then the control proceeds to the complete correction
control.
5. If the detected value for at least any one color of toner varies by a predetermined value
or more from the duty value set through the last gamma correction control, the simpli-
fied correction is first made and then the control proceeds to the gamma correction
control.
☞ 2-35
6. If the detected value varies only within a predetermined value range, the current setting
value is calculated and set based on the previous setting value.
B. Complete correction control
1. The duty value for detection is calculated from the previous setting value.
2. The detection pattern of each color of toner is produced on the Transfer Belt using the
calculated duty value for detection.
3. The detection pattern is detected by the AIDC Sensor and the set duty value is deter-
mined.
Start
Calculate the duty value for detection.
Produce and detect the detection pattern.
Determine the set duty value.
End
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