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Service Guide
67
Printing and print quality problems
Generally, print problems fall into the following six categories:
■
Streaks or lines in the prints
■
No printing
■
Printing too light or too dark
■
Poor quality printing
■
Image is offset or cut off
■
Wrinkling
Not printing
The printer processes a sheet of paper, but no image is printed on it.
1.
No drive voltages to the printhead. Check for a loose connector
leading to the printhead.
2.
Replace the power control board.
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.
Replace the printhead.
Streaks or lines across the print
1.
Check the Y-axis belt tension. If the Y-axis drive is not smoothly and
consistently rotating the drum, horizontal bands or lines appear in the
print.
2.
Replace the Y-axis motor.
3.
Replace the power control board.
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 ...