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Troubleshooting 4-31
NovaJet 800 Series Service Manual
Horizontal Banding
1. Check the print mode for the type of image being printed. Is
the enhanced print pass mode printing OK? Note: photo
pass mode may microband in some of the 2 tone color
ranges including blue, gray, orange, and purple hues.
Enhanced modes should not microband.
Check to see if the media is loaded correctly and is of proper
thickness (no greater than 20 mil media can pass through the
machine). Check to see if the media guides are in place and
are not defective. Check the pinch rollers for alignment/
damage.
Figure 4-23. Defective Magenta Cartridge.
2. Are the color deadband and color calibrations correct? Refer
to Printer Calibrations. Inspect the Prime pattern and verify
diagonal line in the jet test is consistent throughout. The
diagonal line in the Prime pattern should not have sections or
lighter and darker shades, it should not be dissolved or
broken. Refer to Printer Features - ‘Jet Out Detection’.
Clean, manually bypass clogged jets, or replace the cartridge
if any of these abnormal conditions exist. Defective or
clogged cartridges account for 90% of the banding observed.
3. Change the preheat setting for the affected color. To gain
access select SetUp Menu, Ink Option Menu, Ink PreHeat
Settings, choose the appropriate color. If this does not help,
then return settings to zero (0) default at completion of test.