NovaJet 500/630/700 Series Service Manual
7.A flow restriction in the ink delivery system or ink starvation in the cartridge. Ink starvation in the cartridge can be caused by a broken valve in a quick release fitting or pinched tube in the ink supply lines of the tubing/chain assembly. Check the ink delivery system for any flow restrictions by disconnecting the ink cartridge needle from the cartridge in question, raise the tip of the needle and observe the rate that the ink flows back into the reservoir. The ink should take approximately 1 inch per second to clear the 3.5 inch cartridge tubing between the cartridge and the first quick release fitting (flowing back toward the reservoir), if it takes longer than this, you may need to replace a defective quick release fitting (near the cartridge or the reservoir) or tubing/chain assembly.
8.Wiping during a print can sometimes cause a band of lighter density color in the image. Auto wipe may need to be temporarily turned off to prevent banding.
9.Operator intervention. If someone lifts up the media on the
10.Cartridge failures can cause banding — electrical cartridge failures and partial clogging of the inkjets can produce banding. With Inkjet Detection and Compensation technology, electrical cartridge failures and clogging can be corrected for up to 20 failures per cartridge with minimal degradation of the output.
11.Media width variations causing the media to drag on the media guides can cause banding. Check the edges of the media for evidence of media drag and edge anomalies.
12.Lower quality dithering. Select the highest quality dithering pattern in the printer driver. i.e. stochastic dithering.
13.Deadband and cartridge calibrations. If the deadband calibration is off, or the cartridge calibration is off, it can effect banding. Also, if one color seems to be causing the banding — shifting the color calibration of that color
MAINTENANCE
Maintenance
