Canon imagePRESS C1 Service Manual - page 739
Chapter 14
14-4
(2) Horizontal unevenness
If there is horizontal unevenness, it may be caused by fault of photosensitive drum drive unit, drum ITB motor, or drum unit.
(3) Vertical unevenness
If there is vertical unevenness, it may be caused by soiled LDE lens, fault of drum unit, or deterioration of intermediate transfer belt.
F-14-2
14.2.6 Grid (TYPE=6)
0013-4605
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
This test print can mainly check color displacement, right angle accuracy and linearity.
(1) Color displacement
If there is color displacement, it may be caused by fault of each laser scanning system, transfer (intermediate transfer/secondary transfer) unit or photosensitive
drum drive unit.
(2) Right angle accuracy and linearity
If there is fault of right angle accuracy or linearity, it may be caused by fault of laser scanning system, or defective shape of registration (upper/lower) roller or
the secondary transfer outer roller.
F-14-3
14.2.7 MCYBk Horizontal Line (TYPE=10)
0013-4607
imagePRESS C1 P / imagePRESS C1 / imagePRESS C1+ (Printer) / imagePRESS C1+
This test print can mainly check the dark area density of each color, balance among each color and white line by developing.
(1) Solid density of each color and balance among each color.
(a) Density is not extremely light.
(b) In the case of light density with a certain color, it may be caused by the developer of the color in question, or fault of primary transfer roller, laser scanning
system or high voltage system.
(2) White/black line
If there is white/black line with a certain color, it may be caused by fault of the drum unit of the color in question, or soiled laser light path.
(3) Density unevenness at the rear/front
If there is density unevenness with a certain color, it may be caused by fault of drum unit, laser scanning system or transfer (intermediate transfer/secondary
transfer) unit.
If there is density unevenness with all colors, it may be caused by deterioration of intermediate transfer unit.
COLOR-M=1, COLOR-Y/C/K=0