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8. WRITE SECTION
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Theory of Operation Ver1.0 Sep.2006
bizhub PRO C6500
8.2.3 Color registration control
In a black-and-white copier, a toner image formed on its drum can be directly transferred onto paper. In a color
copier, the process is much complicated. This machine uses four photoconductor drums correspond to yellow,
magenta, cyan, and black colors. In order to create a complete toner image, the four separated single-color
toner images formed on the drums must be overlaid on the transfer belt without misalignment. The control to
prevent the misalignment is referred to as "color registration control."
A. Types of the color registration control
There are following five color registration controls and the five controls are carried out for each color correcting
yellow (Y), magenta (M), and cyan (C) with reference to black (K).
The color registration control in the "Partial horizontal magnification" is made by adjusting the write units
mechanically. The other four color registration controls are performed electrically.
*1 To show the symptoms plainly, the sample figures in the table indicate the positions of only two colors.
*2 The gap between the upper and lower lines in the sample figures for "Drift in the main scanning direction",
"Entire horizontal magnification" and "Partial horizontal magnification" is not a misalignment. Just for show-
ing the symptoms clearly.
Correction type Correction method
Drift in the main scan-
ning direction Adjusts the write start timing in the main
scan direction
Drift in the sub-scanning
direction Adjusts the write start timing in the sub-scan
direction
Entire horizontal magni-
fication Adjusts the clock frequency for the wire
units
Inclination Adjusts the angle of the CY2 lens 2 (CY2
lens is driven by the laser correction motor)
Partial horizontal magni-
fication Adjusts the position of the write unit (paral-
lelism against the drum)
See adjusting the timing for the image
adjustment in service mode.