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Phaser 6121MFP Service Manual
2-41
Theory of Operation
developing bias voltage is established that prevents leak image or uneven
density.
•
IDC Sensor intensity control
Adjustments are made to correct changes in IDC Sensor characteristics due to
changes over time or contamination. The IDC Sensor is a photo-reflective
sensor that emits light from an LED and detects the reflected light returning
from the Transfer Belt. The light emitted from the LED is controlled so that the
reflected light density is constant.
•
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.
s6121mfp-147
IN
OUT
Grid Bias
Developing Bias
Developing
Charging
PC
ADC Sensor
Temperature/
Humidity Sensor
ADC Control
1st Transfer Roller
2nd Transfer Roller
ATVC
Summary of Contents for PHASER 6121MFP
Page 1: ...Phaser 6121MFP Multi Function Printer Phaser 6121MFP Service Manual...
Page 2: ......
Page 12: ...x Phaser 6121MFP Service Manual Contents...
Page 22: ...xx Phaser 6121MFP Service Manual...
Page 42: ...1 20 Phaser 6121MFP Service Manual General Information...
Page 106: ...2 64 Phaser 6121MFP Service Manual Theory of Operation...
Page 109: ...Phaser 6121MFP Service Manual 3 3 Error Messages and Codes s6121mfp 372...
Page 194: ...3 88 Phaser 6121MFP Service Manual Error Messages and Codes...
Page 306: ...6 44 Phaser 6121MFP Service Manual Adjustments and Calibrations...
Page 405: ...Phaser 6121MFP Service Manual 8 85 Service Parts Disassembly 3 Remove the spring s6121mfp 255...
Page 432: ...8 112 Phaser 6121MFP Service Manual Service Parts Disassembly...
Page 437: ...Phaser 6121MFP Service Manual 9 5 Parts List...
Page 477: ...Phaser 6121MFP Service Manual 9 45 Parts List...
Page 488: ...9 56 Phaser 6121MFP Service Manual Parts List...
Page 489: ...10 Chapter Wiring In this chapter Plug Jack Designations and Locator Diagrams Wiring Diagrams...
Page 530: ...1 6 Phaser 6121MFP Service Manual Index...
Page 531: ......