ENCAD CADJET Service Manual page 53

6. 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.
7. 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.
8. Operator intervention. If someone lifts up the media on the take-
up side of the printer while it is printing, it can cause
momentary banding in the print. Lifting up the media while
printing changes the inkjet head-to-media distance and will
effect the printed dot size and placement of the ink droplets.
9. 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.
10. 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.
11. Lower quality dithering. Select the highest quality dithering
pattern in the printer driver. i.e. stochastic dithering.
12. 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 +/-1 unit may help.
CadJet 3D Service Manual
Maintenance 3-15