Cartridge Checklist for warranty replacement

NJ750 Training Guide

E. Cartridge Checklist (for warranty replacement)

1.Electrically bad jets (100% filled block) in the Prime pattern (10 nozzle failures for 20 Jet (red-top) cartridges and <500 ml throughput (see UTILITY MENU – SERVICE MENU – CARTRIDGE INFO) warrants a cartridge replacement. Manually bypass clogged jets as necessary (clogged jets, misfires, are not covered by the warranty.) Clean the jet plate thoroughly by blotting with a water dampened lint-free towel to clear clogs.

Catastrophic Failure (more than 35 jets)

Faulty Power Line; check compensation list to verify photo mode is still supported. Clean rear electrical contacts and reseat cartridge to verify problem is not intermittent.

Faulty Address Line; check compensation list to verify photo mode is still supported. Clean rear electrical contacts.

Multiple Power and Address line failures; one cartridge is defective (use post-it note technique to isolate defective cartridge.)

A clogged jet is illustrated as jet 111; jets 105 and 108 are manually bypassed (80% filled blocks only.) Jet 114 is defective and is automatically being bypassed. Between 20 and 35 jets, in each color, may be defective or bypassed to maintain photo quality printing.

2.Microbanding is typically caused by the low pass modes or improper color deadband and color calibrations. If not, then jet degradation of one color

probably exists. Inspect prime pattern for diagonal line integrity and consistency (line should be perfectly straight with no misfires).

Faulty K line; shifts up and down randomly

Microbanding Example; check pass mode

3.Ink Starvation (caused by the Cartridge and not the Ink Delivery System); defective jet plate seal or top lid seal. Test alternate ink delivery lines and tubing needles before cartridge replacement. Swap cartridge positions to check electrical connectivity.