Tektronix Phaser 840, Service Manual

Page: 80 / 207

Service Guide 69
Streaks or lines down the print
There are several possible causes of
streaks running down the length of a
print.
1. Clean the blade of the drum
maintenance drawer. Inspect the
wiper blade of the drum
maintenance kit; replace the
maintenance kit, if necessary.
2. Clean the stripper fingers or rapid
release guide.
3. The x-axis drive is not functioning
correctly. If the X-axis drive does
not slew the printhead smoothly
and evenly during printing,
vertical lines appear in the print.
Print Service Test Print 1 “X-axis”
to reveal an X-axis problem.
Ensure that no wiring harnesses
are interfering with the horizontal
slewing of the printhead. Replace
the X-axis drive, if indicated.
4.
Calibrate the x-axis scale as described in the topic “X-axis scale
adjustment” on page 105.
5. Check for media in the exit path.
6.
If streaks are on the front side of a 2-sided print, the paper preheater
may be scraping ink off the print. Look for ink shaving alongside the
streak. Clean the preheater using the front panel initiated cleaning
process “Remove ink smears.”
7.
Smears on a duplex print can also be caused by the paper preheater
operating at a too high temperature. Use the PC-diagnostics to check the
paper preheater’s temperature. Replace, if necessary.
8. Possible missing, weak or contaminated jet. Print the service test print
Weak/Missing Jet to determine if a jet is not performing. Refer to the
following procedure “Missing ink or light colored ink band running
length of print”.
9. Replace the power control board.
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