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Maintenance 3-23
NovaJet 800 Series Service Manual
MAINTENANCE
create vertical bands to appear in the print. Refer to 'Scheduled Maintenance'
for cleaning or 'Disassembly' for encoder strip replacement.
Line Quality Problems (Overspray)
1. Check the print mode, normally quality is achieved in the draft, normal or best
mode. The Super Draft mode is 600 x 300, not 600 x 600 like the other
modes. Are any compression utilities being used? Avoid embedding text
onto a layer that is compressed, this is known to cause apparent overspray
like symptoms when printed.
2. Are the color deadband and color calibrations correct? Refer to Printer
Calibrations.
3. Check the ink cartridge jet plate for buildup and ink residue. Refer to
Scheduled Maintenance.
4. Clean the encoder strip (top and bottom), slide shaft and inside of carriage belt
with isopropyl alcohol. Refer to Scheduled Maintenance.
5. Check carriage cover bushings (2 bushings) for wear and for cleanliness.
Refer to Scheduled Maintenance. Check carriage bushings (4 inner bushings)
for wear. Refer to Disassembly.
6. Ensure vacuum fan is providing adequate suction for media. Head strike is a
leading cause of inconsistent horizontal banding and reported poor line quality.
The carriage bushings may need replacement if worn out (thus a lower
carriage head height).
7. Change media to see if electrostatic discharge from media is causing the
banding to occur. Add 3rd party protection if required; a static eliminator strip
with carbon fibers running the length of the strip may be necessary to
dissipate discharge values in excess of 25KV. If 3rd party protection is added
to the printer ensure the strip is grounded to the Main PWA ground properly.
8. Perform the carriage vibration test under 'Diagnostics' Menu, the lines should
print fine lines with no jagged edges.
9. Print a test plot off the Demo Images CD. If no overspray or similar problems
show, then check the software driver or original file. Draw a simple box and
send to print from application; default line thickness should be 0.008"
(AutoCAD). Check printed output for correct line thickness. Obtain the Demo