Tektronix Z780GN - Phaser 780 Graphics Color Laser Printer Advanced Features And Troubleshooting Manual page 41

Print Quality Problems (And Examples)
Symptom
Small white spots appear in the same place on
every print.
Vertical bands of varying width and density appear
across the prints.
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Dark band appears in the same area on B-size
paper, about 364 mm (14.3 in.) from the leading
edge of the media, or on every other print on A/A4
media.
Solution
Make another print. If the defect is in the same location, call
Customer Support. If not, replace the imaging unit.
Reprint several pages.
Try changing the background color of the print.
If the problem persists, visit the Tektronix web site or call
Customer Support.
Reprint several pages.
Try changing the background color of the print.
If the problem persists, visit the Tektronix web site or call
Customer Support.
Advanced Features and Troubleshooting Manual
3
Troubleshooting
33