Automatic Line Position Adjustment - Gestetner B147 Service Manual

6.6.6 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
Front
Y
YY
K
KK
C
CC
M
MM
Y
K
C
M
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, and adjusts the following positions and magnification:
• Sub scan line position for YCM
• Main scan line position for KYCM
• Magnification ratio for KYCM
• Skew for YCM
After the patterns are measured, the transfer belt cleaning unit cleans the transfer
belt. If an error is detected three times consecutively, SC285 is generated.
SM
Center
KY YY
KC KK
KM
CC
MM
6-45
LASER EXPOSURE
Rear
KY YY
KC KK
KM
CC
MM
B147/B149/B190
KY
KC
KM
B146D527.WMF