Summary Of Each Adjustment - Gestetner B147 Service Manual

LASER EXPOSURE

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 timing for that color.
Main scan line position for KYCM
If the machine detects that the image is out of position in the main scan direction, it
changes the laser write start timing for each scan line.
Magnification adjustment for KYCM
If the machine detects that magnification adjustment is necessary, it changes the
LD clock frequency for the required color.
Skew for YCM
The adjustment of the skew for YCM is based on the line position for K.
B147/B149/B190 6-46 SM