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

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

Page 1 of 8

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

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

Printhead lenses are dirty. Clean the printhead lenses.

Print quality guide

Page 2 of 8

Color misregistration

Example Cause Solution

ABCDEABCDE

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

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

Page 3 of 8

Streaked horizontal lines

Example Cause Solution

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

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

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

Page 4 of 8

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

Page 6 of 8

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

Page 8 of 8

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