Lexmark C950 Series User manual

Print quality guide
Many print quality problems can be solved by replacing a supply or maintenance item that is approaching the end of its intended
life. Check the printer control panel for a message about a printer supply.
This section provides solutions to print quality problems.
Printer is printing blank pages
Try one or more of the following:
MAKE SURE THERE IS NO PACKING MATERIAL LEFT ON THE TONER CARTRIDGE
Remove the toner cartridge and make sure the packing material is properly removed. Reinstall the toner cartridge.
MAKE SURE THE TONER CARTRIDGE IS NOT LOW ON TONER
When 88.xx [color] cartridge low appears, make sure the toner is distributed evenly within the toner cartridge:
1Remove the toner cartridge.
2Firmly shake the cartridge side-to-side and front-to-back several times to redistribute the toner.
3Reinsert the toner cartridge.
Note: If print quality does not improve, replace the toner cartridge.
If the problem continues, the printer may need to be serviced. For more information, contact Customer Support.
Characters have jagged or uneven edges
If you are using downloaded fonts, verify that the fonts are supported by the printer, the host computer, and the software
program.
Print quality guide
Page 1 of 12

Clipped images
Try one or more of the following:
CHECK THE GUIDES
Move the width and length guides in the tray to the correct positions for the paper size loaded.
CHECK THE PAPER SIZE SETTING
Make sure the paper size setting matches the paper loaded in the tray:
1From the printer control panel Paper menu, check the Paper Size setting.
2Before sending the job to print, specify the correct size setting:
•For Windows users, specify the size from Print Properties.
•For Macintosh users, specify the size from the Page Setup dialog.
Fine horizontal lines appear on color pages
You may notice fine, horizontal lines in photographs or pages with a high concentration of color. This can occur when the printer
is in Quiet Mode. To fix this, set Quiet Mode to Off (Image/Photo).
Shadow images appear on prints
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
CHECK THE PAPER TYPE AND WEIGHT SETTINGS
Make sure the paper type and weight settings match the paper loaded in the tray:
1From the printer control panel Paper menu, check the Paper Type and Paper Weight settings.
2Before sending the job to print, specify the correct type setting:
•For Windows users, specify the type from Print Properties.
•For Macintosh users, specify the type from the Print dialog.
MAKE SURE THE PHOTOCONDUCTOR UNIT IS NOT DEFECTIVE
Replace the defective photoconductor unit.
Print quality guide
Page 2 of 12

MAKE SURE THE TONER CARTRIDGE IS NOT LOW ON TONER
When 88.xx [color] cartridge low appears, make sure the toner is distributed evenly within the toner cartridge.
1Remove the toner cartridge.
Warning—Potential Damage: Be careful not to touch the photoconductor drum. Doing so may affect the print quality of
future print jobs.
2Firmly shake the cartridge side-to-side and front-to-back several times to redistribute the toner.
3Reinsert the toner cartridge.
Note: If print quality does not improve, replace the toner cartridge.
If the problem continues, the printer may need to be serviced. For more information, contact customer support.
Gray background
ABCDE
ABCDE
ABCDE
CHECK THE TONER DARKNESS SETTING
Select a lighter Toner Darkness setting:
•From the printer control panel Quality menu, change the setting.
•For Windows users, change the setting from Print Properties.
•For Macintosh users, change the setting from the Print dialog.
THE TONER CARTRIDGE MAY BE WORN OR DEFECTIVE
Replace the toner cartridge.
Incorrect margins
These are possible solutions. Try one or more of the following:
Print quality guide
Page 3 of 12

CHECK THE PAPER GUIDES
Move the guides in the tray to the correct positions for the paper size loaded.
CHECK THE PAPER SIZE SETTING
Make sure the paper size setting matches the paper loaded in the tray:
1From the printer control panel Paper menu, check the Paper Size setting.
2Before sending the job to print, specify the correct size setting:
•For Windows users, specify the size from Print Properties.
•For Macintosh users, specify the size from the Page Setup dialog.
Light colored line, white line, or incorrectly colored line appears on prints
ABCDE
ABCDE
ABCDE
ABCDE
ABCDE
Try one or more of the following:
MAKE SURE THERE IS NO DEFECTIVE TONER CARTRIDGE
Replace the defective toner cartridge.
MAKE SURE THE PHOTOCONDUCTOR UNIT IS NOT DEFECTIVE
Replace the defective photoconductor unit.
MAKE SURE THE TRANSFER MODULE IS NOT DEFECTIVE
Replace the defective transfer module.
CLEAN THE PRINTHEAD LENSES
1Open the front door, and then the internal cover.
2Locate the printhead wipers.
3Gently pull the printhead wiper out until it stops, and then slowly slide it back into place.
4Clean the remaining three printhead lenses.
Print quality guide
Page 4 of 12

Paper curl
Try one or more of the following:
CHECK THE PAPER TYPE AND WEIGHT SETTINGS
Make sure the paper type and weight settings match the paper loaded in the tray or feeder:
1From the printer control panel Paper menu, check the Paper Type and Paper Weight settings.
2Before sending the print job, specify the correct paper type setting:
•For Windows users, specify the paper type from Print Properties.
•For Macintosh users, specify the paper type from the Print dialog.
LOAD PAPER FROM AFRESH PACKAGE
Paper absorbs moisture due to high humidity. Store paper in its original wrapper until you use it.
Print irregularities
These are possible solutions. Try one or more of the following:
THE PAPER MAY HAVE ABSORBED MOISTURE DUE TO HIGH HUMIDITY
•Load paper from a fresh package.
•Store paper in its original wrapper until you use it.
CHECK THE PAPER TYPE SETTING
Make sure the paper type setting matches the paper loaded in the tray:
1From the printer control panel, check the Paper Type setting from the Paper menu.
2Before sending the job to print, specify the correct type setting:
•For Windows users, specify the type from Print Properties.
•For Macintosh users, specify the type from the Print dialog.
CHECK THE PAPER
Avoid textured paper with rough finishes.
Print quality guide
Page 5 of 12

THE TONER MAY BE LOW
When 88 Cartridge Low appears or when the print becomes faded, replace the toner cartridge.
THE FUSER MAY BE WORN OR DEFECTIVE
Replace the fuser.
Repeating defects appear on a page
Try one or more of the following:
MAKE SURE THE PHOTOCONDUCTOR UNIT IS NOT DEFECTIVE
The photoconductor unit may be defective if marks occur repeatedly in only one color and multiple times on a page.
•Replace the photoconductor unit if the defects occur every 94.2 mm (3.71 in.) or 37.68 mm (1.48 in.).
MAKE SURE THE FUSER IS NOT DEFECTIVE
The fuser may be defective if the marks occur down repeatedly in all colors.
•Replace the fuser if the defects occur every 141 mm (5.55 in.).
Skewed print
Try one or more of the following:
CHECK THE PAPER GUIDES
Adjust the length and width guides in the tray to the correct positions for the paper size loaded.
•Make sure the guides are not too far from the paper stack.
•Make sure the guides are not pressing too lightly against the paper stack.
CHECK THE PAPER
Make sure you are using paper that meets the printer specifications.
MAKE SURE THE PRINTER IS CLEAN OR IS NOT CONTAMINATED WITH PAPER DUST
Clean the exterior of the printer
1Make sure that the printer is turned off and unplugged from the wall outlet.
Warning—Potential Damage: To avoid the risk of electric shock when cleaning the exterior of the printer, unplug the power
cord from the wall outlet and disconnect all cables to the printer before proceeding.
2Remove paper from the standard exit bin.
3Dampen a clean, lint-free cloth with water.
Warning—Potential Damage: Do not use household cleaners or detergents, as they may damage the finish of the printer.
Print quality guide
Page 6 of 12

4Wipe only the exterior of the printer, making sure to include the standard exit bin.
Warning—Potential Damage: Using a damp cloth to clean the interior may cause damage to your printer.
5Make sure the paper support and standard exit bin are dry before beginning a new print job.
MAKE SURE THE PAPER FEED ROLLERS ARE CLEAN AND ARE NOT CONTAMINATED WITH DUST
1Turn the printer off using the power switch, and then unplug the power cord from the wall outlet.
2Remove the paper feed rollers.
Note: For instructions on how to remove and reinstall the paper feed rollers, see the setup sheet that came with the rollers
inside the compartment box of Tray 1.
3Dampen a clean, lint-free cloth with water.
4Clean the paper feed rollers.
Warning—Potential Damage: Do not touch the rubber. Doing so will damage the rollers.
5Reinstall the paper feed rollers.
Note: Make sure to replace the worn or defective paper feed rollers.
Solid color pages
MAKE SURE THE PHOTOCONDUCTOR IS NOT DEFECTIVE AND IS INSTALLED CORRECTLY
Remove and then reinstall the photoconductor. If the problem continues, then the photoconductor may need to be replaced.
Streaked horizontal lines appear on prints
ABCDE
ABCDE
ABCDE
Try one or more of the following:
Print quality guide
Page 7 of 12

SELECT ANOTHER TRAY OR FEEDER
•From the printer control panel Paper Menu, select Default Source.
•For Windows users, select the paper source from Print Properties.
•For Macintosh users, select the paper source from the Print dialog and pop-up menus.
MAKE SURE THERE IS NO WORN, DEFECTIVE, OR EMPTY TONER CARTRIDGE
Replace the worn, defective, or empty toner cartridge.
CLEAR THE PAPER PATH AROUND THE TONER CARTRIDGE
CAUTION—HOT SURFACE: The inside of the printer might be hot. To reduce the risk of injury from a hot component, allow
the surface to cool before touching.
Clear any paper you see or clean any visible toner from the paper path. If the problem persists, then contact Customer Support.
Streaked vertical lines appear on prints
ABCDE
ABCDE
ABCDE
Try one or more of the following:
SELECT ANOTHER TRAY OR FEEDER
•From the printer control panel Paper menu, select Default Source
•For Windows users, select the paper source from Print Properties.
•For Macintosh users, select the paper source from the Print dialog and pop-up menus.
MAKE SURE THERE IS NO WORN, DEFECTIVE, OR EMPTY TONER CARTRIDGE
Replace the worn, defective, or empty toner cartridge.
CLEAR THE PAPER PATH AROUND THE TONER CARTRIDGE
Check the paper path around the toner cartridge.
CAUTION—HOT SURFACE: The inside of the printer might be hot. To reduce the risk of injury from a hot component, allow
the surface to cool before touching.
Clear any paper you see.
MAKE SURE THERE IS NO TONER IN THE PAPER PATH
Print quality guide
Page 8 of 12

Print is too dark
Try one or more of the following:
CHECK THE DARKNESS, BRIGHTNESS, AND CONTRAST SETTINGS
The Toner Darkness setting may be too dark, the Brightness setting may be too dark, or the Contrast setting may be too high.
•Change these settings from the printer control panel Quality menu.
•For Windows users, change these settings from Print Properties.
•For Macintosh users:
1Choose File > Print.
2From the “Orientation pictures” menu, choose Printer Features.
3Choose a lower value for the Toner Darkness, Brightness, and Contrast settings.
LOAD PAPER FROM AFRESH PACKAGE
The paper may have absorbed moisture due to high humidity. Store paper in its original wrapper until you use it.
AVOID TEXTURED PAPER WITH ROUGH FINISHES
CHECK THE PAPER TYPE SETTING
Make sure the paper type setting matches the paper loaded in the tray or feeder:
•From the printer control panel Paper menu, check the Paper Type setting.
•For Windows users, check this setting from Print Properties.
•For Macintosh users, check this setting from the Print dialog.
Print is too light
Try one or more of the following:
Print quality guide
Page 9 of 12

CHECK THE DARKNESS, BRIGHTNESS, AND CONTRAST SETTINGS
The Toner Darkness setting may be too light, the Brightness setting may be too light, or the Contrast setting may be too low.
•Change these settings from the printer control panel Quality menu.
•For Windows users, change these settings from Print Properties
•For Macintosh users:
1Choose File > Print.
2From the Orientation pictures drop-down menu, choose Printer Features.
3Choose a higher value for the Toner Darkness, Brightness, and Contrast settings.
LOAD PAPER FROM AFRESH PACKAGE
The paper may have absorbed moisture from high humidity. Store paper in its original wrapper until you use it.
AVOID TEXTURED PAPER WITH ROUGH FINISHES
CHECK THE PAPER TYPE SETTING
Make sure the Paper Type setting matches the paper loaded in the tray or feeder:
•From the printer control panel Paper menu, check the Paper Type setting.
•For Windows users, check this setting from Print Properties.
•For Macintosh users, check this setting from the Print dialog.
Transparency print quality is poor
Try one or more of the following:
CHECK THE TRANSPARENCIES
Use only transparencies that meet the printer specifications.
CHECK THE PAPER TYPE SETTING
Make sure the paper type setting is set to Transparency:
1From the printer control panel Paper menu, check the Paper Type setting.
2Before sending the job to print, specify the correct type setting:
•For Windows users, specify the type from Print Properties.
•For Macintosh users, specify the type from the Print dialog.
Print quality guide
Page 10 of 12