Toner Density Detection Control; Drive; Operation - Konica Minolta magicolor 4690MF Service Manual

Theory of operation Ver. 1.0 May 2008
19.1.1

Drive

19.2 Operation

19.2.1

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 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.
Transfer belt surface
4138to2084c0
• A voltage corresponding to the intensity of the light reflected off the toner pattern is out-
put to the MFP board.
IDC sensor
Amount of toner Intensity of light
sticking
Large
Small
19. Conveyance section (IDC sensor)
LED
Output
reflected
Small Low
Great High
A011T2C582AA
Photodiode
4138to2085c0
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