Konica Minolta bizhub C250 Service Manual page 91

14. Transfer corona section
14.3.4 IDC sensor shutter mechanism
• The IDC sensor can be contaminated with toner since it is located under the transfer belt.
There is a shutter mechanism provided for the sensor to prevent it from being contami-
nated.
• The shutter opens and closes in synchronism with the pressure and retraction motion of
the 2nd image transfer roller.
• The cam will press the pressure lever to open the shutter on the IDC sensor during
retraction.
• The cam will press the pressure lever to close the shutter on the IDC sensor while the
roller is pressing.
2nd image transfer roller
Retracted
Pressed
A. Shutter open/close operation
1. Drive from the 2nd image transfer pressure/retraction motor is transmitted through
a gear train to the drive gear.
2. The drive gear will rotate to turn the cam half way. Pressing the pressure lever
down will open the shutter.
3. Turning the motor ON again will turn the cam half way. Releasing the pressure lever
will close the shutter.
Shutter
IDC/registration
sensor/2 (SE2)
Shutter
Pressure lever
When sensor shutter is closed
58
Shutter
Open
Closed
IDC/registration
sensor/1 (SE1)
4038T2C169AA
4038T2C108AA
Theory of operation ver. 3.0 Aug. 2006
2nd image transfer pressure/
retraction motor (M5)
Shutter
4038T2C204AA
When sensor shutter is open
4038T2C107AA
4038T2C170AA