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Maintenance 3-19
NovaJet 800 Series Service Manual
MAINTENANCE
Banding Causes & Quick Analysis
Horizontal Banding Problems
1. Check the print mode for the type of image being printed. Refer to
Printer Calibrations - 'Checking Print Mode'. Is the high pass mode
(5 pass for 2x4 configuration, 10 pass for 1x4, 1x6, and 1x8 cartridge
set configurations) printing successful? Note: 3 pass mode (2x4
configuration) or 4 pass mode (1x4, 1x6, and 1x8 cartridge set
configurations) will microband in many of the 2 tone color ranges
including some blue, gray, orange, and purple hues. 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.
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 line 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.
4. Ensure the Auto-Wipe feature is turned off. To gain access select
SetUp Menu, Paper Option Menu, Auto-Wipe, select off. Auto-Wipe
of the carriage head (occurs every 2 minutes when activated) can
cause a dry band to appear on the print. This feature is normally
defaulted off. The printer will normally spit into the service station
every 15 seconds (GO or GX ink loaded) or every 2 minutes (GS+ ink
loaded) to keep nozzles clear but will not interfere with print and dry
time to cause banding of any nature.