Image Quality Control - Toshiba e-STUDIO 2555C Service Manual

3.15 Image Quality Control

3.15.1 General Description
Two image position aligning sensors are mounted inside of the 2nd transfer front guide beneath the
transfer belt.
The image position aligning sensor on the rear side combines its own functions with those of the image
quality sensors.
At this control, image forming conditions are automatically adjusted so as to minimize the change in the
image density or tone reproduction caused by the fluctuation of working environment or life of supply
items.
At first, the image quality sensor (S8) operates to output reflected light amount voltage when no toner
image is formed on the transfer belt. The output voltage is then converted analog-to-digital to be output
as the reflected light amount signal. The light source amount voltage of the sensor is adjusted to
correspond with the value set in advance and the output value of reflected light amount signal at this
adjustment is stored. This output value is considered as the reading of the belt surface. Next, the
sensor outputs the reflected light amount signal when a test pattern is developed on the transfer belt.
This output value is considered as the reading of the toner image.
The difference between the reading of the transfer belt and that of the toner image is defined as toner
adhesion amount. Image forming conditions are determined in approximating this toner adhesion
amount to the value set in advance.
[1] Image position aligning sensor (Front)
[2] Image position aligning sensor (Rear)/Image quality sensor
[3] 2nd transfer front guide
[4] Transfer belt
e-STUDIO2555C/3055C/3555C/4555C/5055C
OUTLINE OF THE MACHINE
[4]
[1], [2]
Fig. 3-44
3 - 76
[3]
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