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AIDC Sensor Main Unit Theory of Operation
2-64
II Composition/Operation
11.1.1 Drive
11.2 Operation
11.2.1 Toner density detection control
• A reflective sensor is used for the AIDC Sensor that detects the amount of toner sticking
to the surface of the Transfer Belt. Image stabilization is performed based on the value
detected.
• The detection pattern (toner image) produced on the surface of the Transfer Belt is irradi-
ated with light emitted by the LED of the sensor.
• The photodiode of the sensor detects the light reflected off the toner pattern on the sur-
face of the Transfer Belt.
• A voltage corresponding to the intensity of the light reflected off the toner pattern is out-
put to the Mechanical Control Board (PWB-A).
[1] Pressure/Retraction Clutch/2nd Image
Transfer (CL5)
[3] AIDC Sensor Cover
[2] Retraction Cam [4] AIDC Sensor Lever
4138to2083c0
[1]
[2]
[4]
[3]
4138to2084c0
AIDC Sensor
4138to2085c0
Transfer Belt surface
LED
Photodiode
Amount of toner
sticking
Intensity of light
reflected
Output
Large Small Low
Small Great High
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