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41388601TH Rev.2 32 /
2.6 Color Misalignment Correction
C9000 is equipped with multiple LED heads, which can result in color misalignment.
The mechanically induced color misalignment is automatically corrected as follows:
(1) Color alignment to be corrected
1 Color misalignment in X-axis direction (Positional error caused by LED head)
2 Color misalignment in slanting direction (Positional error caused by LED head)
3 Color misalignment in Y-axis direction (Positional error caused by I/D unit and LED head)
(2) Correcting
Printing the preset color misalignment detection pattern on the belt and, by a reflection
sensor, reading the printed pattern detects each color’s misalignment value to determine its
correction value. The correction value is used to change each color’s (Cyan, Magenta and
Yellow) writing timing in comparison with that of Black.
2.7 Transfer Control Responds to Environmental Changes (Room Temperatures and
Relative Humidities)
C9000 measures room temperature and relative humidity using a room temperature sensor and
humidity sensor, and calculates an optimum transfer voltage under its measurement environment
to perform real-time control on printing with the optimum voltage.