Automatic Line Position Adjustment - Ricoh B230 Service Manual

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6.5.5 AUTOMATIC LINE POSITION ADJUSTMENT

CC, KK, YY, MM: Spaces between two lines of the same color

KC, KY, KM: Spaces between a black line and a color line

During automatic line position adjustment, the line patterns above are created eight times

on the transfer belt. The spaces between the lines (CC, KK, YY, MM, KC, KY, KM) are

measured by the front, center, and rear ID sensors. The controller takes the average of the

spaces. Then it adjusts the following positions and magnification:

Sub scan line position for CMY

Main scan line position for CMY

Magnification ratio for CKMY

Skew for CMY

The transfer belt-cleaning unit cleans the transfer belt after the patterns are measured.

SC285 shows if an error is detected four times consecutively.

Summary of Each Adjustment

Sub scan line position for YCM

The adjustment of the sub-scan line position for YCM is based on the line position for K

(color registration). The machine measures the gaps between the lines of each color in the

pattern on the transfer belt. If the gaps for a color are not correct, the machine moves the

image of the color up or down the sub scan axis. To do this, it changes the laser write

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