Sony C9000 service manual Color Misalignment Correction

2.6Color 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.

2.7Transfer 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.

41388601TH Rev.2 32 /