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Main Unit Theory of Operation Toner Cartridge / Developing Unit
2-35
II Composition/Operation
7.2.6 Gamma correction control
• A gradation pattern is produced on the surface of the Transfer Belt. The AIDC Sensor
measures the density of this pattern and transmits the results of measurement to the
controller for gradation correction.
• The gamma correction is controlled integrally with other control items by the image stabi-
lization control.
• The gamma correction control is performed when there is a request made for execution
of image stabilization sequence.
☞ 2-120
A. Correction control
1. A detection pattern of each color of toner is produced on the surface of the Transfer
Belt.
2. The detection pattern is detected by the AIDC Sensor.
3. The mean value of the readings taken is calculated.
4. Noise is removed from the mean value.
5. Rearrange the readings in descending order.
6. Normalize the readings.
Start
Remove noise.
Produce the detection pattern
and detect it.
End
Rearrange readings.
Normalize readings.
Average out the AIDC output value
for each gradation level.
4138to2141e0
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