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Oki Data CONFIDENTIAL

42930511TH Rev. 2 51 /

CMYK

Transfer belt

Color drift sensor R

Color drift sensor L

Cleaning blade

LED head

The belt run direction

(Figure seen from the bottom)

Cleaning blade

Color drift sensor L/R

2.13 Color Drift Detection

The Z71-PCB reflective optical sensor detects color drift. There is one each on the left and right side

in front of the cleaning blade behind the belt unit. A color drift detection pattern is printed on both ends

of the left and right side of the belt. Then the reflective optical sensor reads this detection pattern to

measure the drift level based on black as a standard. The correction value is then determined based

on this measurement. Then the main scanning, sub-scanning, and skewed color drift correction au-

tomatically takes place.

This detection takes place when the power is turned ON, cover is closed, the printer is left unused

for 2 hours or longer, and every time after printing 400 sheets.

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