Service manual

LASER EXPOSURE

SM 6-25 G130/G131

Detailed

Descriptions

6.3.5 AUTOMATIC LINE POSITION ADJUSTMENT

Overview

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

KY, KC, 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 (YY, KK, CC, MM, KY, KC,

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 YCM

• Main scan line position for YCM

• Magnification ratio for KYCM

• Skew for YCM

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

measured. SC285 shows if an error is detected four times consecutively.

CenterFront Rear

G130D522.WMF