Tektronix PHASER 560 Service Manual page 217

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Test Prints
Dark vertical line in print, single color
If the line is of one primary color, then the trouble can usually be
traced to a defect in the color's toner cartridge. Too much toner is
transferred from the developer roller to the photoconductive belt
at the defect point.
Vertical line 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. A blocked laser beam problem can appear as a
fuzzy, vertical line running through the entire print.
Small, repeating light dot in one color
This can usually be traced to a dent-like defect in the developer
roller of the toner cartridge in question. The dents should be
1.5 inches (3.4 cm) apart or 1 inch (2.5 cm) for 1200 dpi printing.
No toner is transferred from the developer roller to the
photoconductive belt at the defect point.
If the spots are about 5 inches (12.5 cm) apart, then the problem
is a defect on the fuser roller. Replace the fuser.
In some instances, the spots may be dark instead of white. They
may also be shaped something other than round.
Refer to the topic "Repeated spots or lines on print in-line with
each other" on page 6-24. It discusses causes of repeated spots
based on the distance between the spots.
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Service Manual
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