2-12 Phaser 6300/6350/6360 Color Laser Printer Service Manual
Theory of Operation
Color Registration Control
The printer uses a quad system where drums and developers are used
exclusively for each of the four colors (yellow, magenta, cyan, and black).
Images are formed on the drums, in the respective colors, and then layered to
form one image. To avoid a positional shift between the different color images,
the color registration control calculates how much the registration has shifted
by comparing each of the other color patches in the registration string to the
black bar that precedes it. Shift is corrected by adjusting the laser write timing
to compensate.
Color registration control is made depending on the internal temperature and
print count at the execution of process control.
This control is outlined below:
1. With no toner on the Transfer Roller, the output value of the CTD (ADC)
Sensor is measured to determine the reference value.
2. Patches for color registration control are
generated on the Transfer Roller. These
patches are composed of 10 mm lines
of each toner color in the following
order: K, C, K, M, K. The string of
patches is led by a black trigger patch
that is larger than the registration
patches.
3. The density of patches generated is
measured by the CTD (ADC) Sensor.
4. The amount of registration shift is
calculated from the reference value
determined in Step 1 and the patch
density measured in Step 3.
5. The laser write timing is changed to
compensate for any registration shift.
10 mm
About One Turn
Of Transfer Roller
s6360-068
K
K
C
K
M
K
Y
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