Canon imageRUNNER ADVANCE 4551i Service Manual page 336

2. Change the value as gap A in the figure.
• If the image is displaced to the trailing edge: Increase the value. (The image shifts to the leading edge.)
• If the image is displaced to the leading edge: Decrease the value. (The image shifts to the trailing edge.)
Setting Value; 1=0.1mm
3. When the setting value was changed in step 2, write down the new numerical value in the service label.
NOTE:
The service label affixed to the back of Reader Front Cover.
● Adjusting the White Level
NOTE:
1. This is a item of adjustment in which the white level of images made in stream reading mode are matched with the white level
of images made in book mode. If this adjustment is skiped, the following will likely occur:
• Inappropriate reproduction of background density in images made in stream reading mode.
• Wrong speck detection in stream reading mode.
2. The white level adjustments execute the following item in the service mode.
(LV.1) COPIER > FUNCTION > CCD > DF-WLVL1
(LV.1) COPIER > FUNCTION > CCD > DF-WLVL2
< If the image is displaced toward trailing edge >
Leading edge of
Leading edge of
printed image
test chart image
A
Feed direction
< If the image is displaced toward leading edge >
Leading edge of
Leading edge of
test chart image
printed image
A
Feed direction
323
5. Adjustment