Lexmark T630 User's Reference Manual page 114

Problem
Entire page is white.
Streaks appear on the
page.
ABC
DEF
Printing is too dark
ABC ABC
DEF DEF
Characters have jagged or
uneven edges
Solving print quality problems
Action
• Make sure the packaging material is removed from the print cartridge.
• Check the print cartridge to be sure it is installed correctly.
• The toner may be low. To utilize the remaining toner, remove the
cartridge by gripping the handles with both hands. With the cartridge
arrows pointing downward, shake the print cartridge back and forth.
Reinstall the cartridge and then press Go.
• The toner may be low. To utilize the remaining toner, remove the
cartridge by gripping the handles with both hands. With the cartridge
arrows pointing downward, shake the print cartridge back and forth.
Reinstall the cartridge and then press Go.
• If you are using preprinted forms, make sure the ink can withstand
temperatures of 212°C (414°F).
Change the Toner Darkness
Note: Macintosh computer users should make sure the lines per inch
(lpi) setting is not set too high in the software application.
• Change the Print Resolution
or 1200 dpi.
• If you are using downloaded fonts, verify that the fonts are supported
by the printer, the host computer, and the software application.
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setting in the Quality Menu.
setting in the Quality Menu to 600 dpi