Theory of Operation Ver. 1.0 Sep. 2008
12. Developing section
49
bizhub C200
Composition/Operation
12.3.4
TCR sensor control
• The TCR sensor is mounted on the underside of each of the developing sections.
• The sensor for C, M, Y and K is a magnetic type.
• Each of these sensors detects toner-to-carrier ratio (T/C) of the developer. The reading is
used for determining the amount of toner supplied.
• Only when a new imaging unit is installed in the machine, an automatic adjustment is
made of each of these TCR sensors. The automatic adjustment of TCR sensors cannot
be done at your own discretion.
• The target T/C ratio is 7%.
• The magnetic permeability (powder density) of the carrier in the developer is measured
to determine the T/C.
• A mylar is provided for the conveying screw portion to scrape toner off the surface of the
TCR sensor.
• The TCR sensor is integrated with the imaging unit. When the TCR sensor is to be
replaced with a new one, the entire imaging unit must be replaced.
4038to503c0
4038T2C031AA
TCR sensor
Mylar
TCR sensor
TCR sensor
Y109670-2 Theory of Operation