Lexmark T640 Service Manual page 204

4061-xx0
Problem
Toner fog or background shading
appears on the page.
Entire page is white.
Streaks appear on the page.
Printing is too dark.
3-34
Service Manual
Action
• Check the print cartridge to make sure it is installed correctly.
• The Toner Darkness setting may be too dark. Change the Toner
Darkness setting in the Quality Menu.
• Replace the charge rolls.
• Replace the print cartridge.
• 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, firmly shake the print
cartridge side-to-side and front-to-back several times to
redistribute the toner. Reinstall the cartridge and then press
Repeat this procedure multiple times until the print remains
faded. When the print remains faded replace the print cartridge.
• 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, firmly shake the print
cartridge side-to-side and front-to-back several times to
redistribute the toner. Reinstall the cartridge and then press
Repeat this procedure multiple times until the print remains
faded. When the print remains faded replace the print cartridge.
• If you are using preprinted forms, make sure the ink can
withstand temperatures of 230°C (446°F).
• Change the Toner Darkness setting in the Quality menu.
• Change the Brightness setting in the Quality menu.
• Change the Contrast setting in the Quality menu.
Note: Macintosh computer users should make sure the job lines per
inch (lpi) setting is not set too high in the software application.
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