Olivetti d-Color 201MF Theory Of Operation page 33

8. Write section (PH section)
A. Types of color registration control
• Color shift is misalignment of the images of three different colors, yellow (Y), magenta
(M), and cyan (C), with respect to the image of black (K).
• Four different types of color shift can occur: the color shift in the main scan direction, the
color shift due to overall scaling error in the main scan direction, the color shift in the sub
scan direction, and image skew.
(1) The color shift in the main scan direction
• If the image of each color (Y, M, C) is misaligned with respect to the image of black (K) in
the main scan direction, changing the write start timing in the main scan direction can
correct the color shift. Color shift correction needs to be performed separately for the
respective colors (Y, M, C).
• Color shift correction control is activated when the image stabilization sequence is
started.
* When the image of magenta is misaligned with respect to the image of black (K)
Transfer belt
Rotational
direction of the
transfer belt
26
Theory of Operation Ver. 1.0 Sep. 2008
Before correction
Color shift
Black (K)
Theory of Operation
After correction
Magenta (M) No color shift
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