Tektronix Phaser 740, Руководство по обслуживанию

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Phaser 740 and 750 Color Printers
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 12.1 cm (5 in.) 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.
9922-75