Apple ColorLaserWriter 12/600PS - Manual (Page 264)

Color print quality problems
Horizontal bands appear on the printed page.
When you print solid color images you can expect some horizontal banding
(fine horizontal lines that are more obvious in solid color areas). To minimize
banding, try these steps:
m Banding is more likely with 30 to 60 percent print coverage. Try a different
pattern with more white space or more coverage.
m Use light background color, rather than dark.
m Replace the toner cartridge containing the associated color.
m Replace the photoconductor cartridge.
You cannot get smooth color gradients in printed pages.
Try these steps:
m Make sure the application program you’re using lets you print the colors
you want.
m Replace the toner cartridge containing the associated color.
m Replace the photoconductor cartridge.
White gap appears between adjacent color.
m From the Print Quality pop-up menu (in the Print Options dialog box),
choose Best.
m Change the colors. Choose colors that are closer to each other in the
spectrum. (For example, with red and green, there’s more white gap; with
blue and green, the white gap is reduced.)
241 Fixing Image Problems