Konica Minolta A00F011 Service Manual - Page 102
Drive, Toner density detection control
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Theory of operation Ver. 1.0 Nov. 2007 18.1.1 Drive 18. Conveyance section (IDC sensor) magicolor 4650EN magicolor 4650DN Composition/Operation A011T2C582AA 18.2 Operation 18.2.1 Toner density detection control • A reflective sensor is used for the IDC 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 irradiated with light emitted by the LED of the sensor. • The photodiode of the sensor detects the light reflected off the toner pattern on the surface of the transfer belt. Photodiode Transfer belt surface 4138to2084c0 IDC sensor LED 4138to2085c0 • A voltage corresponding to the intensity of the light reflected off the toner pattern is output to the MFP board. Amount of toner sticking Large Small Intensity of light reflected Small Great Output Low High 67