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Service Guide
73
Poor primary color fills
Primary fills appear banded and
inconsistent.
1.
Possible missing, weak or
contaminated jet. Print the service
test print Weak/Missing Jet to
determine if a jet is not performing.
2.
Verify the drum temperature using
PC-based diagnostics. Ensure the
drum temperature sensor is
properly positioned.
3.
Head-to-drum gap is too small.
Verify the gap with the adjustment
explained in the topic “Printhead-
to-drum spacing adjustment
(Phaser 840 printer)” on page 102.
4.
Verify the paper preheater
temperature using PC-based
diagnostics.
5.
Refer to the topic “Evaluating
the printhead and cap/wipe/
purge system” on page 80. A properly functioning printhead
maintenance system is essential for proper printhead operation.
6.
If the problem persists, replace the printhead.
Ghosting
Drum is too warm.
1.
Verify the drum temperature using
PC-based diagnostics. Ensure the
drum-temperature sensor is
properly positioned.
2.
Run multiple prints; the first 2-
sided print will have the worst
ghosting.
0388-47
0388-71
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 ...