Dell C2660dn Color Laser Printer - Manual (Page 336)

Action Yes No
1 If the printer is installed in a high altitude location, set the altitude of
the location.
The task is complete. Go to action 2.
a Launch the Tool Box, and click Maintenance on the Printer
Maintenance tab.
b Under Adjust Altitude, select the value close to the altitude of the
location where the printer is installed.
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2 Replace the drum cartridges. See "Replacing the Drum Cartridges." The task is complete. Contact Dell.
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Jagged characters
Action Yes No
1 Set Screen to Fineness in the printer driver.
a On the Others tab, set Screen under Items: to Fineness.
The task is complete. Go to action 2.
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2 Set Print Mode to High Quality in the printer driver.
a On the Graphics tab, select High Quality from Print Mode.
The task is complete. Go to action 3.
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3 Enable Bitmap Smoothing in the printer driver.
a On the Others tab, set Bitmap Smoothing under Items: to On.
The task is complete. Go to action 4.
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4 Enable Print Page Mode in the printer driver.
a On the Others tab, set Print Page Mode under Items: to On.
The task is complete. Go to action 5.
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5 If using a downloaded font, ensure that the font is recommended for the
printer, operating system, and the application being used.
The task is complete. Contact Dell.
Does this solve your problem?
Troubleshooting Guide 334