HP Color LaserJet Enterprise MFP M680 series - Page 507

Table 2-64 Image defects table (continued)
Problem Sample Cause Solution
Spots on a flatbed scan (M680).
All scans from the flatbed glass
print with random dark or light
spots. Every page has spots in the
same place.
NOTE: For mono scans, the
spots are dark. For color scans, the
spots are the color of the
contamination.
The flatbed glass is
contaminated.
Clean the glass with a water-
dampened lint-free cloth.
White halo of missing toner on the
trailing edge of characters or
graphics which have a light
halftone as the background.
Missing toner areas are caused
by toner depletion that occurs
when the OPC and developer
rollers transition from heavy to
light coverage.
The page must contain some color
elements (text or graphics) for the
following procedure to reduce or
eliminate toner depletion.
1. Use the print driver to open the
Color tab.
2. Select Manual, and then select
Settings.
3. Select Manual, and then select
Settings.
4. When the Options dialog box
appears, select Graphics and
then set the Neutral Grays to 4-
Color.
TIP: For the Mac OS, this
setting is in the Color Options
drop-down tab.
ENWW Solve image quality problems 483