Develop ineo+ 6500 Service Manual page 69

8. WRITE SECTION
3.
Calculating and correcting the color drift amount
The interval between the detection of one edge of the registration mark and the next edge with the PS8 and PS9
sensors are recorded. As shown below, each time interval between the edge detections is determined with the
counts of clock signal, and the counts with the PS8 and those with the PS9 are recorded separately.
[5]
[4]
[1] Detecting direction (transferring direction)
[2] Address number of the detected edge
[3] Counts of clock signal corresponding to the
address for each detected edge
The recorded time intervals for cyan, magenta, yellow colors are compared with those for black color, and the
differences are determined as color drift amounts. In addition to that, the difference between the PS8 and PS9
time intervals of black color is compared with those of the other colors in order to determine color drift amounts
caused by tilt of write units. According to the obtained drift amounts, the registration control is performed.
38
0 1 2 3 4 5 6
150 300
180 330
[4]
[5]
Theory of Operation Ver1.0 Sep.2006
[1]
[2]
7 8
[3]
Clock signal
Binarized digital signals
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