Color Calibration, Deadband Check

NJ750 Training Guide

D.Color Calibration

To activate the Color calibration select Utility Menu - Color Calib. Menu – Calib Test (NJ850: Both Vert Calib Test and Horiz. Calib. Test.) Seven horizontal patterns followed by seven vertical patterns will print. The color calibration pattern should be performed whenever a cartridge is removed from the carriage for cleaning or replacement. Choose the best value under each aligning set of colors, i.e. yellow to magenta, then magenta to cyan, then cyan to black. Enter the most correct value for each of the 14 fields. Note: stalls 1 through 4 correspond to the Left 4 cartridges.

E.Deadband Check

To activate the Deadband calibration select Utility Menu - Service Menu - Calibration Menu - Deadband. The deadband pattern will print very quickly in all color ranges. This is a final check of printer calibrations to ensure alignment has been achieved. Ensure the vertical lines are straight with respect to each color, if severely out of alignment, as in this example, then a re-calibration of the printer is necessary or cleaning of the encoder strip is necessary. Note: The pattern does not have to be perfect, just close to maintaining vertical alignments.

F.Controlling Image Skew (not media skew as this is mechanical).

The NovaJet 750/800 series of printers are designed with self-aligning pinch rollers. The alignment process takes place when media is advancing forward, but not backwards. Loading media is critical to the media alignment and reducing skew. Many times the media is loaded at a slight skew and will take several feet of advancing media to get it aligned properly. This can be improved by following the steps below.

1. Load the media and align the rear media guides.