Kyocera KM-4230 Service Manual page 239

2A3/4
Maintenance
item No.
U091 Checking shading
Description
Performs scanning under the same conditions as before and after shading
is performed, displaying the original scanning values at nine points of the
contact glass on the touch panel.
Purpose
To check the change in original scanning values before and after shading.
The results may be used to decide the causes for fixing unevenness
(uneven density) of the gray area of an image: either due to optical
(shading or CCD) or other problems.
Also to check the causes for a white or black line appearing longitudinally.
3-2-30
Description