HP Designjet T3500 Production eMFP - Manual (Page 225)

calibrating the scanner (an old or damaged maintenance sheet may cause this problem); if it is
damaged, call HP support and ask for a new maintenance sheet.
4. If the problem persists, proceed to analyze the following areas of the diagnostic plot:
a. 4 (from module A to E).
b. 10, at the intersection between modules.
c. 13 in modules A and E, and 14 in modules B, C, and D.
If you see any of these defects in the studied areas, call HP support and report a “line discontinuities”
error after calibration.
The four vertical thin black lines at the beginning and the end of the diagnostic plot show, approximately, the
position of the intersection between CIS modules, where this kind of error usually appears. If the error
appears outside these areas, call HP support and report “line discontinuities within a CIS module”.
Grain in area fills when scanning plain paper
When making copies of an original containing area fills, if the paper used in the printer is plain paper (for
instance, HP Universal Bond or HP Bright White Inkjet Bond), some grain may appear in the image. This error
may also appear in scanned files of originals that were printed on textured paper. The example below shows
the original image on the left and the scanned, grainy image on the right.
ENWW Grain in area fills when scanning plain paper 215