Canon iR C6800 Series Service Manual page 1125

15.4.1.1.3 <ADJ Y>
Use it to adjust the CCD read start cell position (image read start position in main scanning direction).
Method of if the non image width is larger than the indicated value, decrease the setting.
adjustment if an area outside the original is copied, increase the setting.
an increase by 1 of the setting will move the image read start position by 0.1 mm in the direction of
the leading edge (i.e., the image read area will move toward the leading edge).
if you have initialized the RAM on the reader controller PCB or replaced the reader controller PCB,
enter the value indicated on the service label.
Range of 47 to 131
adjustment [at time of shipment: factory measurement/after RAM initialization: 90]
Attention1 If you have changed the setting, be sure to record the new setting on the service label.
15.4.1.1.4 <ADJ S>
Method of
adjustment
Range of
adjustment
Attention
Decrease the setting
(so that the read start
position moves toward the rear).
Increase the setting
(so that the read
start position moves
toward the front).
Use it to enter an adjustment value for the point of measurement for scanner shading.
a decrease by 1 of the setting will move the point of measurement for shading by 0.1
mm in the direction of the leading edge.
if you have initialized the RAM on the reader controller PCB or replaced the reader
controller PCB, enter the value indicated on the service label.
30 to 50
[at time of shipment: factory measurement/after RAM initialization: 50]
If you have changed the setting, be sure to record the new setting on the service label.
T-15-31
Read start position
Original
F-15-16
T-15-32
Chapter 15
0005-6796
0005-6793
15-61