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Troubleshooting 4-20
NovaJet 800 Series Service Manual
Failure Analysis - Print Misfires
1. Ensure ink is in supply to cartridge jets? Are the ink lines full
of ink at the reservoir tubing needles (connected to reservoir)
and at the cartridge tubing/septum needles (connected to
cartridges)?
2. Are the ink cartridges /contact points (flex contacts) dirty?
Clean with isopropyl alcohol. Does the Prime pattern print
correctly? Refer to Routine Maintenance.
3. For spitting or random ink droplets landing on the media,
ensure the cartridges are only half full (20 ml) and that
humidity ranges (10% to 70% RH non-condensing) are
adhered to.
Figure 4-2. Excessive Ink Pressure.
4. Is the service station clean and working properly? Are the
seals or wipers worn? Clean the service station under
running water. Ensure all wipers stand up straight in the
station. Replace service station as necessary.