Konica Minolta Magicolor 2490 MF, Руководство по обслуживанию

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Theory of operation ver. 1.0 July. 2006 19. Image stabilization control
71
magicolor 2490MF
Composition/Operation
19.2 Operation
19.2.1 Leak detection control
• For the clearance between the photo conductor and developing roller, an optimum devel-
oping bias voltage is established that does not result in a leak image or uneven density.
19.2.2 AIDC Sensor LED intensity control
• The following adjustment is made to correct any changes in characteristics occurring due
to change with time and contamination of the IDC Sensor: the intensity of the LED is
adjusted for the surface of the transfer belt on which no toner sticks, so that the output
value of the IDC Sensor becomes constant.
19.2.3 Reflectance measurement control
• The reflectance of the Image transfer belt is measured using the IDC sensor.
One measurement is taken for one complete turn of the image transfer belt.
• The measured value is corrected during the laser intensity adjustment control and
γ
cor-
rection control.
19.2.4 Control of the maximum amount of toner sticking
• The developing bias setting value is adjusted to keep constant the amount of toner stick-
ing to the surface of the photo conductor with reference to the 100% solid image.
19.2.5 Laser intensity adjustment control
• Characteristics of the photo conductor, developing, and charging change as affected by
changes with time and in environment. The intensity of the laser light is adjusted so that
fine lines and gradations of a predetermined level are reproduced at all times.
19.2.6
γ
correction control
• A gradation pattern is produced on the surface of the image transfer belt. The IDC sensor
measures the density of the pattern and sends the measured result to the controller for
gradation adjustment.