Xerox Phaser 6115MFP Service Manual page 81

Theory of Operation
Reflectance measurement control
The reflectance of the Transfer Belt is measured using the IDC Sensor.
The measurement is taken for one complete revolution of the Transfer
Belt. The measured value is corrected during the intensity adjustment and
G-correction control.
Toner adherence control
The developing bias voltage value is adjusted to keep constant the
amount of toner sticking to the surface of the Drum with reference to the
100% solid image.
Laser intensity adjustment control
Characteristics of the Drum, developing, and charging processes are
affected over time and by the environment. The intensity of the laser light
is adjusted so that fine lines and gradations of a predetermined level are
reproduced at all times.
G-correction control
A gradation pattern is produced on the surface of the Transfer Belt. The
IDC Sensor measures the density of the pattern and sends the measured
result to the controller for gradation adjustment.
AIDC Sensor
1st Transfer Roller
2nd Transfer Roller
Developing
PC
Charging
Developing Bias Grid Bias
AIDC Control
ATVC
IN
OUT
Temperature/
Humidity Sensor
s6115-102
Phaser 6115MFP Multifunction Product Service Manual 2-37