Dark, Irregular, Vertical Streaks And Smears On The Entire Page - Tektronix Phaser 740 Service Manual

Dark, irregular, 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.
Alternately, replace fuser.
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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.
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Phaser 740 and 750 Color Printers