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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.
0388-41
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...