Xerox Phaser 840, Service Manual

Page: 107 / 287

Troubleshooting 3 - 91
Streaks or lines down the print
There are several possible causes of streaks
running down the length of a print.
Table 3-9 Streaks or lines down the print
Step Question and Actions
1
Clean the wiper blade of the drum maintenance drawer. Inspect the operation of
the drum maintenance kit.
Replace the Maintenance Kit if necessry.
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 4-149.
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" on
page 3-89.
9
Replace the power control board.
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