Tektronix PHASER 560 Service Manual page 218

B
Test Prints
B-4 Phaser 560 Color Printer
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Single light, horizontal line in all the prints
This is probably caused by a defective photoconductive belt onto
which toner will not transfer. Replace the imaging unit.
Large, random light smudges
Spots such as those illustrated are caused by fingerprints on the
photoconductive or accumulator belt. Often, the smudges will
gradually fade with additional printing. Alternately, the imaging
unit will have to be replaced.
Finger prints can be removed by applying some toner (any color)
to the fingerprints and rubbing lightly with a cotton-tipped swab.
Don't remove the toner. The printer will remove the toner with its
cleaning blade. Remember not to expose the imaging unit to
ambient light for more then a minute.