Lexmark 25A0450 - C 736N Color Laser Printer 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.
Use the following table to find solutions to print quality problems:
Isolating print quality problems
To help isolate print quality problems, print the print quality test pages:
1Make sure paper is loaded in Tray 1.
2Turn the printer off.
3From the printer control panel, press and hold and the right arrow button while turning the printer on.
4Release both buttons when the clock appears, and wait for Config Menu to appear.
5Press the down arrow button until Prt Quality Pgs appears, and then press .
The print quality test pages print.
6Press the down arrow button until Exit Config Menu appears, and then press .
Resetting the Printer appears briefly, followed by a clock, and then Ready appears.
Print irregularities
Example Cause Solution
) )
ABCDE
ABCDE
ABCDE
Paper has absorbed moisture due to high humidity. Load paper from a fresh package into the paper tray.
You are using paper that does not meet the printer
specifications.
Make sure that the Paper Type and Paper Weight
settings match the type of paper that you are using.
Avoid textured paper with rough finishes.
A toner cartridge, thetransfer module, or thefuseris worn
or defective.
Replace the print cartridge, the transfer module, or
the fuser.
Print quality guide
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Repeating defects
Cause Solution
If marks occur repeatedly in only one color and multiple times on a page:
A toner cartridge is defective. Replace the toner cartridge if the defects occur every:
•33.0 mm (1.30 in.)
•35.3 mm (1.39 in.)
A photoconductor is defective. Replace the photoconductor if the defects occur every:
•28.3 mm (1.11 in.)
•72.4 mm (2.85 in.)
If marks occur down the page repeatedly in all colors:
The fuser is defective. Replace the fuser if the defects occur every:
•47.4 mm (1.87 in.)
•94.8 mm (3.73 in.)
•113.0 mm (4.45 in.)
Light colored line, white line, or incorrectly colored line
Example Cause Solution
ABCDE
ABCDE
Toner cartridge is defective. Replace the color cartridge causing the line.
Photoconductor is defective. Replace the photoconductor.
Transfer module is defective. Replace the transfer module.
ABCDE
ABCDE
ABCDE
Printhead lenses are dirty. Clean the printhead lenses.
Print quality guide
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Color misregistration
Example Cause Solution
ABCDEABCDE
ABCDE
ABCDE
Color has shifted outside of the appropriate
area or has been superimposed over another
color area.
1Recalibrate the printer.
•Perform Color Adjust from the Quality
menu
2Remove and reinstall the
photoconductor.
3Adjust the color alignment. For more
information, see “Adjusting the color
alignment” on page 3.
Note: If you have not resolved the issue,
then recalibrate again. If necessary, adjust
the color alignment again.
Adjusting the color alignment
1Make sure that the printer is turned off.
2From the printer control panel, press and hold and the right arrow button while turning the printer on.
3Release both buttons when the clock appears.
The printer performs its power-on sequence, and then Config Menu appears.
4Press the down arrow button until Color Alignment appears, and then press .
5Press again to print the alignment page.
6Press the down arrow button until Set A appears, and then press .
7From the printed sheet, find the straightest of the 20 lines beside the letter A.
8Press the left arrow button or the right arrow button until that number is displayed, and then press .
Submitting selection appears.
9Repeat steps 6 through 8 to align sets A through L.
10 Press .
11 Press .
12 Press the down arrow button until Exit Config Menu appears, and then press .
Resetting the Printer appears briefly, followed by a clock, and then Ready appears.
Print quality guide
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Streaked horizontal lines
Example Cause Solution
ABCDE
ABCDE
ABCDE
A toner cartridge is defective, empty, or
worn.
Replace the toner cartridge.
Fuser is defective or worn. Replace the fuser.
Photoconductor may be defective. Replace the defective photoconductor.
Streaked vertical lines
Example Cause Solution
ABCDE
ABCDE
ABCDE
Toner is smeared before fusing to the
paper.
If paper is stiff, try feeding from another
tray.
Toner cartridge is defective. Replace the toner cartridge causing the
streaks.
Transfer module is worn or defective. Replace the transfer module.
Uneven print density
Example Cause Solution
ABCDE
ABCDE
ABCDE
Toner cartridge is worn or defective. Replace the toner cartridge.
Photoconductor is worn or defective. Replace the photoconductor.
Print is too dark
Cause Solution
Printer may not have recalibrated recently. Perform Color Adjust from the Quality menu.
Toner Darkness setting is too dark, RGB Brightness setting is too
dark, or RGB Contrast setting is too high.
Select a different Toner Darkness setting, RGB Brightness setting,
or RGBContrast setting from Print Properties before sending the
job to print.
Toner cartridge is worn or defective. Replace the toner cartridge.
Print quality guide
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Print is too light
Cause Solution
Printer may not have recalibrated recently. Perform Color Adjust from the Quality menu.
Toner Darkness setting is too light, RGB Brightness setting is too
bright, or RGB Contrast setting is too high.
•Select a different Toner Darkness setting, RGB Brightness
setting, or RGB Contrast setting from Print Properties before
sending the job to print.
•Adjust the color quality settings in the Quality menu.
You are usingpaper that does not meet the printer specifications. •Load paper from a new package.
•Avoid textured paper with rough finishes.
•Make sure the paper you load in the trays is not damp.
•Make sure the Paper Type and Paper Weight settings match
the type of paper that you are using.
Color Saver is On. Turn Color Saver off in the Quality menu.
Toner is low. Replace the toner cartridge.
Toner cartridge is worn or defective.
Transparency print quality is poor
Cause Solution
You are using transparencies that do not meet the printer
specifications.
Use only transparencies recommended by the printer
manufacturer.
Paper Type setting for the tray you are using is set to something
other than Transparency.
Make sure the Paper Type setting is set to Transparency.
Gray background
Cause Solution
Toner darkness setting is too dark. Select a different toner darkness setting in the printer software before sending the job to
print.
Toner cartridge is worn or defective. Replace the toner cartridge.
Ghost images
Cause Solution
The photoconductor is not functioning properly. •Make sure the Paper Type setting is correct for the media that
you are using.
•Replace the photoconductor.
The paper weight or Paper Weight setting in the Paper Menu
is wrong for the type of paper being used.
Make sure the Paper Type and Paper Weight settings match the
type of paper that you are using.
Toner is low. Replace the toner cartridge.
Print quality guide
Page 5 of 8

Toner specks
Cause Solution
Toner cartridges are worn or defective. Replace the defective or worn cartridges.
Toner is in the paper path. Call for service.
The photoconductor may be defective. Replace the defective photoconductor.
Toner fog or background shading appears on the page
Cause Solution
Toner cartridge is defective or installed incorrectly. Reinstall or replace the cartridge.
Transfer module is worn or defective. Replace the transfer module.
Photoconductor is worn or defective. Replace the photoconductor.
Fuser is worn or defective. Replace the fuser.
Toner is in the paper path. Call for service.
Printer may not have recalibrated recently. Perform color adjust from the Quality menu.
Application may specify off-white background. Check the application.
Toner rubs off
Cause Solution
Specialty media is being used. Make sure the correct Paper Type is selected.
The Paper Weight setting in the Paper Menu is wrong for the type
of paper being used.
Change the Paper Weight from Normal to Heavy. If necessary,
change Paper Texture from Normal to Rough.
Fuser is worn or defective. Replace the fuser.
Clipped images
Cause Solution
Guides in the selected tray are setfor a different paper size than
what is loaded in the tray.
Move the guides in the tray to the proper positions for the size
loaded.
There could be an incorrect page size selected in the driver or
program.
•Specify the correct page size in the driver or program.
•Set the Paper Size to match the media in the tray.
Print quality guide
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Skewed print
Cause Solution
Guides in the selected tray are not in the correct position for the
paper size loaded in the tray.
Move the guides in the tray to the proper positions for the size
loaded.
•Make sure that the width guide is not too far from the paper
stack.
•Make sure that the width guide is not pressing too tightly
against the paper stack.
•Make sure that the length guide is not too far from the paper
stack.
•Make sure that the length guide is not pressing too tightly
against the paper stack.
You are using paper that does not meet the printer specifications. Make sure that you are using paper that meets the printer
specifications.
Incorrect margins
Cause Solution
Guides in the selectedtray are set fora different paper size than
what is loaded in the tray.
Move the guides in the tray to the proper positions for the size
loaded.
Auto size sensing is set to Off, but you loaded a different size
paper in a tray. For example, you inserted A4-size paper into
the selected tray but did not set the Paper Size to A4.
•Set the Paper Size to match the paper size in the tray.
•Specify the correct page size in Print Properties or the program.
Blank pages
Cause Solution
Packaging materials have not been removed from the
toner cartridge.
Remove the packaging materials from the toner cartridge, and reinstall
it.
Toner is low. •Remove the toner cartridge from the printer. Shake the cartridge
back and forth several times, and then reinstall it.
•Install a new toner cartridge.
Toner cartridge is defective or empty. Replace the toner cartridge.
Printer requires servicing. Call for service.
Solid color pages
Cause Solution
Photoconductor is installed incorrectly. Remove and then reinstall the photoconductor.
Photoconductor is defective. Replace the photoconductor.
Printer requires servicing. Call for service.
Print quality guide
Page 7 of 8

Paper curls badly
Cause Solution
Paper Type and Paper Weight settings are not appropriate for the
type of paper or specialty media that you are using.
Change the Paper Type and Paper Weight settings to match
the paper or specialty media loaded in the printer.
Paper has been stored in a high-humidity environment. Load paper from a fresh package.
Store paper in its original wrapper until you use it.
Print quality guide
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