Tektronix Phaser 840, Service Manual

Page: 84 / 207

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.
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