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72
Phaser 840 and 850 Color Printers
Fuzzy text
Text appears indistinct and difficult to
read.
1.
Head-to-drum gap is too great.
Verify the gap with the adjustment
as explained in the topic
“Printhead-to-drum spacing
adjustment (Phaser 840 printer)” on
page 102.
2.
Verify the drum temperature using
PC-based diagnostics. Ensure the
drum temperature sensor is
properly positioned.
3.
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.
4.
If the problem persists, replace the
printhead.
5.
Verify the operation of the Y-axis encoder using PC-based diagnostics.
Replace the encoder if needed.
Variation of density on second side of print
1.
The transfix spring pressure is incorrect. Perform the procedure
“Transfix roller pressure spring adjustment” on page 110.
Ghost of first side image on second side of print
Incomplete image transfer is taking place on the first side of the print.
1.
Inspect the drum-maintenance system. Does the drum-maintenance
roller contain sufficient oil? Replace the drum-maintenance roller (and
counter chip), if necessary.
2.
Is the drum-maintenance cam roller and electric clutch operating
correctly? Test them using PC-based diagnostics.
3.
Ensure the left and right drum-maintenance actuators operate correctly
when lifted by the cams of the drum-maintenance cam roller.
0388-70
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 ...