Tektronix Phaser 840, Quick Reference Manual

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Service Guide
47
7. 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. Replace the X-axis drive, if indicated.
8.
Replace the x-axis drive assembly.
9.
Replace the power control board.
10.
If streaks are on the front side of a duplex print, the paper preheater
may be scraping ink off the print. Clean the preheater using the front
panel initiated cleaning process “Remove ink smears.”
11. 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.
Missing ink or light colored ink band running length of print
Possible missing or weak jet.
1. Print the Service Test Print 2
“Weak Jet” to determine if a jet is
not performing. Perform up to
three printhead cleaning cycles to
try to clean a clogged jet.
2. If necessary, turn off the printer
and allow the printhead to cool
for 6 hours.
3.
Ensure the printhead
maintenance vacuum system
operates correctly.
4. If weak or missing jet cannot be
recovered, replace the
printhead.
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