12. Developing section
Theory of Operation Ver. 8.0 Jun. 2008
6
0
Composition/Operation
12.3.6
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-car-
rier ratio (T/C) of the developer. The reading is used for determining the amount of toner
supplied.
• Individual TCR sensors are automatically adjusted when a new imaging unit is installed
in the machine and they cannot be adjusted manually.
• The target T/C ratio is 7% for both color and K.
• The target T/C ratio can be changed in the TCR level setting available from the service
mode.
• 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. (Only IU/Y, M, C)
• 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.
A00JT2C038AA
A00JT2C037AA
A00JT2C028DA
4036ma2188c0
TCR sensor/Y,M.C
TCR sensor/K
TCR sensor/Y,M,C
(TCRS/Y,M,C)
TCR sensor/K
(TCRS/K)
Cleaning film
Theory of Operation Y107522-3
