Idc Sensor Calibration Control - Konica Minolta magicolor 5550 Service Manual

Theory of operation Ver. 1.0 Nov. 2006
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 pressure 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
Pressure cam
18. Conveyance section (IDC sensor)
Pressure cam
4138to2577c0
4138to2551c0
73