Drive - Konica Minolta magicolor 5550 Service Manual

18. Conveyance section (IDC sensor)
18.1.1

Drive

IDC sensor cover
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 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.
72
Retraction cam
IDC sensor
Amount of toner Intensity of light
sticking
Large
Small
Theory of operation Ver. 1.0 Nov. 2006
IDC sensor lever
4138to2083c0
LED
Output
reflected
Small Low
Great High
Pressure/
retraction
clutch/2 (CL5)
Photodiode
4138to2085c0