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2. Ink Overspray
Ink Overspray and/or combination of
data shift and ink overspray is
observed. Normally occurs at severe
ground fault locations (high levels of
AC riding on ground/neutral lines or
high levels of ESD are coming from the
air plenum). Refer to B. below.
3. Media Static Cling (Feed Transport Problems/Tiling Problems)
- Color calibration horizontal lines (i.e. Color Cal Vertical pattern) are incorrectly spaced
(i.e. two lines are closer together while one line is spread farther from the other two) or
may be printed outside of the calibration box area.
- Paper Axis Calibration values may be consistently too low (i.e. 4840
to 4870). Typical feed adjust should be 4800 +/- 15 for most media
types. Media which generates a high amount of static electricity (i.e.
15,000~30,000 volts) and is thin (i.e. 3 mil) may be subject to improper
transfer through the printer's media path (often referred to as 'media
static cling'.
NOTE:
To isolate a suspected media type, load a different the media type (i.e. rapid dry
or coated matte print paper) and run the line length test and color calibration pattern
again. Print a test image approximately 1 yard (or 1 meter) in length to evaluate printer's
performance.
4. Improper Print Output
- Static discharge build-up combined with poor building grounding can cause excessive
ESD discharge, from the media as it unwinds, during long plots. This will depend on the
media type and media transport rate through the printer. Print the 'All Color Test' to
evaluate general printer performance including ink system/internal cartridge pressure.
NovaJet 800 Series Training Guide
Abnormal Color Test print
patterns – degraded output in
both examples were caused
by electrostatic discharge
from media (carriage board
was damaged in both cases)
44
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