Konica Minolta A00F011 Service Manual - Page 103
IDC sensor calibration control, IDC sensor shutter mechanism
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magicolor 4650EN magicolor 4650DN 18. Conveyance section (IDC sensor) Theory of operation Ver.1.0 Nov. 2007 18.2.2 IDC sensor calibration control • Changes in various types of characteristics due to change with time of the IDC sensor (deteriorated LED, dirty sensor surface), part-to-part variations in the sensors, and change of environment affect the IDC sensor output corresponding to the clear transfer belt surface. To correct fluctuations in the output, the sensor LED intensity is adjusted so as to keep constant the IDC sensor output value. 18.2.3 IDC sensor shutter mechanism • Since the IDC sensor is installed below the transfer belt, it can be dirtied with toner or other foreign matter. A shutter mechanism is therefore provided above the IDC sensor to prevent it from being dirtied. • The shutter is opened or closed in synchronism with the pressure or retraction motion of the 2nd transfer roller. When the 2nd transfer roller is pressed, the Cam pushes up the sensor lever, which opens the shutter above the IDC sensor. • When the 2nd transfer roller is released, the shutter above the IDC sensor is closed by the tension of a spring. Shutter Cam A011T2C581AA Composition/Operation 68