Lexmark C720 SERIES User manual

Using color

Paper handling

Maintenance

Troubleshooting

Administration

Printing

Index

Solving printing problems 1

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Lexmark C720

Some printer problems are very easy to solve. If your printer is not responding, first make

sure:

•The printer cable is securely attached to the printer and the host computer.

•The power cord is plugged into the printer and a properly grounded electrical outlet.

•The printer is turned on.

•The electrical outlet is not turned off by any switch or breaker.

•The printer front, top, and rear doors are completely closed.

•All printer options are properly installed.

Once you’ve checked each of these possibilities, turn the printer off and back on. This often

fixes the problem.

If a message appears on the operator panel display, see Understanding printer messages

for more information. If the message indicates the printer has a paper jam, see Clearing

paper jams.

If you are having trouble determining the source of the problem, see Print quality problems

for other suggestions.

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Solving printing problems 2

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Lexmark C720

The information in the following tables may help you solve printing problems. If these

suggestions do not correct the problem, call for service. You may have a printer part that

requires adjustment or replacement.

Toner cartridge problems

Problem Action

You cannot insert a toner

cartridge into the printer. Make sure the toner cartridge is aligned properly and is being

installed in the correct location. See Replacing toner cartridges for

more information.

Toneraccumulatesinside the

printer. Replace the toner cartridge that matches the color of the toner that

has accumulated inside the printer. See Replacing toner

cartridges.

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Solving printing problems 3

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Lexmark C720

Print quality problems

Problem Action

Print is too light, or printed

images or characters have

voids or dropouts.

Make sure the front, top, and rear doors are closed completely.

Make sure you’re using recommended paper or other media. Use

media from a new package.

Make sure you have selected the correct Paper Type setting for the

media you’re using.

If you suspect a toner cartridge is low on toner, remove the

appropriate cartridge and gently shake it back-and-forth to distribute

the toner evenly. Reinsert the cartridge and try printing the job again.

Replace the toner cartridge that matches the color on the page that

is too light or not present in the void areas. See Replacing the toner

cartridge.

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Solving printing problems 4

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Lexmark C720

Colored lines, streaks, or

smudges appear on the

printed page, or print appears

blurred or unclear.

Replace the toner cartridge that matches the color of the lines,

streaks, or smudges on the page. See Replacing toner cartridges.

Clean the photo developer discharger. See Cleaning the photo

developer charger.

Make sure the the drum cleaner is fully seated. See Replace the

drum cleaner.

The page has 100%

coverage of one color. Replace the toner cartridge that matches the color on the page. See

Replacing toner cartridges.

Print quality problems (continued)

Problem Action

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Solving printing problems 5

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Lexmark C720

Light lines or streaks appear

on the printed page. Remove the toner cartridge that matches the color of the lines or

streaks and gently shake it back and forth to distribute the toner

evenly. Reinsert the toner cartridge and try printing the job again.

Replace the toner cartridge that matches the color of the lines or

streaks on the page. See Replacing toner cartridges.

If the lines are black, you may need to replace the fuser. See Fuser

and air filter for more information.

Light lines or voids appear

from the top of the page to

the bottom of the page.

Remove the photo developer cartridge and clean the dust from the

photo developer cartridge discharger. (See Cleaning the photo

developer charger.) Reinsert the photo developer cartridge and try

printing the job again.

The toner cartridge may be low on toner, remove the cartridge, shake

it, and reinsert it. If the problem still occurs, replace the toner

cartridge. See Replacing toner cartridges.

Replace the photo developer cartridge. See Replacing the photo

developer cartridge.

Print quality problems (continued)

Problem Action

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Solving printing problems 6

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Lexmark C720

The page is blank or one of

the colors is missing. Replace the toner cartridge that matches the missing color on the

page. See Replacing toner cartridges.

Toner smears or rubs off the

page. Make sure you’re using recommended paper or other media.

Make sure you have selected the correct Paper Type setting for the

media you’re using.

Make sure the rear door is completely closed.

Print quality problems (continued)

Problem Action

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Solving printing problems 7

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Lexmark C720

Toner adheres to the back of

the page. Make sure the paper size is set properly for the paper length you are

printing on. Print several pages to clean the transfer roller of excess

toner.

You may need to replace the fuser. See Fuser and air filter for more

information.

Printed materials delivered

by the postal service arrive

with ghosting or mirror

images of the text visible on

the page.

When preparing printed materials for mailing:

•Use 24 lb (90 g/m2) paper.

•Avoid rough paper; select paper with a smoothness from 100 to

150 Sheffield points.

•Fold sheets with the text facing outward.

•Meter envelopes or use precanceled stamps.

•Place envelopes in trays and deliver to the post office; do not

drop envelopes into mail boxes or chutes.

Print quality problems (continued)

Problem Action

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Solving printing problems 8

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Lexmark C720

Quality of printed

transparencies is inadequate. Make sure you’re using the recommended Lexmark transparencies.

See Transparencies for more information.

When printing transparencies, always set Paper Type to

Transparency.

Avoid getting fingerprints on transparencies before printing.

Print on the page is skewed. Make sure the width guides in the paper tray fit snugly against the

media you loaded. See Loading media for more information.

Print quality problems (continued)

Problem Action

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Solving printing problems 9

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Lexmark C720

Quality of printed images is

inadequate. If you’re printing low resolution images using PostScript 3 emulation,

set Image Smoothing On. See PostScript Menu for more

information.

A white gap is noticeable

between color fills. Make sure the three printer foot pads are resting on a level surface.

Print quality problems (continued)

Problem Action

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Solving printing problems 10

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Lexmark C720

Colors do not print as you

expect. Make sure you have selected the appropriate Color Correction and

Print Quality values for the job you’re printing. See Color Menu for

more information.

Print quality problems (continued)

Problem Action

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