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Main Unit Theory of Operation AIDC Sensor
2-65
II Composition/Operation
11.2.2 AIDC Sensor calibration control
• Changes in various types of characteristics due to change with time of the AIDC Sensor
(deteriorated LED, dirty sensor surface), part-to-part variations in the sensors, and
change of environment affect the AIDC Sensor output corresponding to the clear Trans-
fer Belt surface. To correct fluctuations in the output, the sensor LED intensity is adjusted
so as to keep constant the AIDC Sensor output value.
• The AIDC Sensor calibration control may be either the simplified check or complete cor-
rection.
• The AIDC Sensor calibration is controlled integrally with other control items by the image
stabilization control.
• The AIDC Sensor calibration control is performed when there is a request made for exe-
cution of image stabilization sequence.
☞ 2-120
A. Simplified correction control
1. The offset voltage of the AIDC Sensor is calculated.
2. A simplified detection pattern of each color of toner is produced on the surface of the
Transfer Belt.
3. The LED is illuminated with the intensity value set last to let the AIDC Sensor detect the
output value.
4. If the output value is a predetermined value or more, the intensity value set last
becomes the current setting value.
5. If the output value is less than the predetermined value, the control proceeds to the
complete correction.
Start
Calculate the offset voltage.
Complete correction control
Check the output value based on
the previously set intensity value.
Define the previously set intensity
value as the set intensity.
End
4138to2139e0
Reference value
Less than reference value
Reference value or more
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