Tektronix PHASER 560 Service Manual page 216

B
Test Prints
B-2 Phaser 560 Color Printer
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Single color mottled or with non-uniform density streaks.
If a single color displays a mottled appearance or if a single color
shows many vertical streaks of varying densities, then that color's
toner cartridge is running of toner. Replace the cartridge.
Vertical line or scratch in print, single color
If the scratch is of one missing primary color, then the trouble can
usually be traced to a scratch in the developer roller of the
missing toner's toner cartridge. No toner is transferred from the
developer roller to the photoconductive belt at the defect point.
Vertical line or scratch in print, all colors
The problem may be caused by contamination on the laser
window where the laser beam exits the laser scanner and enters
the imaging unit. Since the blocked laser beam cannot discharge
the portion of the photoconductive belt it cannot reach, toner will
not transfer to those portions of the belt. Consequently a blank,
vertical line will appear on the prints in all colors. Remove the
imaging unit and, with a squeeze bulb, blow any dust or toner off
of the window (located in the "ceiling" of the cavity left in the
printer once the imaging unit is removed).
If it is in all colors then the problem may be in the imaging unit,
such as a scratched photoconductive belt. Replace the imaging
unit.
A very thin, white line could be caused by a scratched roller in the
fuser which replacing will solve. The scratch in the print may not
be continuous but rather a set of in-line vertical scratches.
Inspect the fuser roller and the print. If the scratches are about 5
inches (12.1 cm) apart and match the defects on the print, then
the problem is a scratch on the fuser roller. Replace the fuser.
Lastly a protrusion of some kind in the paper path could be
scratching the print.