Tektronix PHASER 560 Service Manual page 220

B
Test Prints
B-6 Phaser 560 Color Printer
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Dark, vertical streaks and smears on the entire page
This is usually due to the accumulator belt toner waste bin being
filled and spilling out on the belt. The spilled toner is then being
transferred to the print. Most prominent in the middle of the print
and in the yellow band. A defective cleaning blade could also
cause this. In either case, replacing the imaging unit should fix
the problem.
One primary color faded or pale OR a single color has a dark
vertical streak
This indicates a problem with a single toner cartridge. Replacing
the toner cartridge should fix the problem.
If it does not, there may be a problem with the toner cartridge
selector/eject unit. It may not be pushing the cartridge quite far
enough to make proper contact with the photoconductive belt,
resulting in poor toner transfer. Replace the toner cartridge
selector/eject unit.
Lastly, poor electro-mechanical contact my be the problem,
although this usually shows itself as light, horizontal streaks and
lines. Replace the toner cartridge biasing assembly.