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Your MarkNet N8000 series internal print
server is not set up properly or is not
connected properly
Verify that you have properly configured the printer
for network printing.
Solving printing problems
Lexmark™ X642
Troubleshooting
Guide
The operator panel display is blank
Turn the printer off, wait about 10 seconds, and turn
the printer back on.
See the drivers CD or the Lexmark Web site for
information.
If the Ready message does not appear, turn the
printer off and call for service.
Online technical support
Technical support is available on our Lexmark Web
You are using the wrong interface cable,
or the cable is not securely connected
Make sure you are using a recommended interface
cable.
The message USB device
unsupportedappears when using
a USB device
For information regarding tested and approved USB
flash memory devices, see our Lexmark Web site at
http://support.lexmark.com and click on
Checking an unresponsive
printer
Make sure the connection is secure.
Held jobs do not print
If the printer is not responding, first make sure:
KnowledgeBase to search for Direct USB printing.
• The power cord is plugged into the printer and
a properly grounded electrical outlet.
• The electrical outlet is not turned off by any
switch or breaker.
• The printer is not plugged into any surge
protectors, uninterrupted power supplies, or
extension cords.
A formatting error has occurred
• Print the job. (Only part of the job may print.)
• Delete the job.
• Free up additional printer memory by scrolling
through the list of held jobs and deleting others
you have sent to the printer.
Jobs do not print
The printer is not ready to receive data
Make sure Readyor Power Saver appears on the
display before sending a job to print.
• Other electrical equipment plugged into the
outlet is working.
• The printer is turned on.
• The printer cable is securely attached to the
printer and the host computer, print server,
option, or other network device.
The printer has insufficient memory
The specified output bin is full
Remove the stack of paper from the output bin.
• Print the job. (Only part of the job may print.)
• Delete the job.
• Free up additional printer memory by scrolling
through the list of held jobs and deleting others
you have sent to the printer.
The specified tray is empty
Load paper in the tray.
Once you have checked each of these possibilities,
turn the printer off and back on. This often fixes the
problem.
The printer has received invalid data
Delete the job.
You are using the wrong printer driver or
are printing to a file
• Verify you are using the printer driver
associated with the printer.
Job takes longer than expected to
print
Printing multi-language
PDFs
• If you are using a USB port, make sure you are
running Windows 98/Me, Windows 2000,
Windows XP, or Windows Server 2003 and
using a Windows 98/Me, Windows 2000,
Windows XP, or Windows Server 2003
compatible printer driver.
1 Open the document you want to print in Adobe
The job is too complex
Acrobat.
Reduce the complexity of your print job by
eliminating the number and size of fonts, the number
and complexity of images, and the number of pages
in the job.
2 Click the printer icon.
3 Check the Print as image box.
4 Click OK.
Consistent misfeeds or jams in the
drawer
Try the following:
Guides in the selected tray are not set to
the appropriate position for the size
paper loaded.
Solving 2000-sheet drawer
problems
Move the guides in the tray to the correct position.
The elevator tray does not raise when
the loading door is closed, or the
elevator tray does not lower when the
door is opened and the elevator button is
pushed
• Flex the paper.
• Turn the print media over.
The paper has absorbed moisture due to
high humidity.
Load paper from a fresh package.
Check the following:
• Drawer is properly installed.
• Print media is loaded correctly.
• Print media is not damaged.
• Print media meets specifications.
• Guides are positioned correctly for the print
media size selected.
Check the following:
Store paper in its original wrapper until you load it.
• The printer is properly attached to the 2000-
sheet drawer.
• The printer is powered on.
• The power cord is plugged firmly into the back
of the 2000-sheet drawer.
The Paper Jam message remains
after you remove the jammed
paper.
Clear paper from the entire paper path.
• The power cord is plugged into an outlet.
• The outlet has power.
Service messages
The page that jammed does not
reprint after you clear the jam.
A service message indicates printer failure that may
require service.
The elevator tray lowers unexpectedly
Check to see if the printer is out of print media or has
a jam.
Turn the printer off, wait about 10 seconds, and then
turn the printer on.
Set Jam Recovery to Auto or On.
For more information, see the Menus and Messages
Guide
If the error recurs, write down the error number, the
problem, and a detailed description. Call for service.
More than one sheet of print media is
fed, or a sheet is fed improperly
Remove the print media in the printer paper path,
and check the stack to ensure the print media has
been loaded properly. Be sure to remove the top and
bottom sheets of each ream of paper that is loaded.
Blank pages feed into the output
bin
Load the correct type media for your print job, or
change the Paper Type to match the type of media
loaded.
Solving paper feed
problems
Paper frequently jams
A jam occurs
For more information, see the Menus and Messages
Remove the print media in the printer paper path,
and check the stack to ensure the print media has
been loaded properly. Be sure to remove the top and
bottom sheets of each ream of paper that is loaded.
Guide.
You are using paper that does not meet
the printer specifications.
Use recommended paper and other specialty media.
Original documents misfeed in the
ADF
See the Card Stock & Label Guide available on the
specifications.
• Adjust the guides toward the media until they
lightly rest against the edge of the media.
• If the pick pad is worn, replace the pick pad.
Rubber feed rollers do not turn to
advance print media
Check the following:
For information that can help prevent jams from
• The power cord is plugged firmly into the back
of the 2000-sheet drawer.
• The power cord is plugged into an outlet.
• The outlet has power.
occurring, see the Clearing Jams Guide.
Print quality
You have loaded too much paper or too
many envelopes.
Make sure the stack of paper you load does not
exceed the maximum stack height indicated at the
front of the tray or on the multipurpose feeder.
troubleshooting
To help isolate print quality problems, print the “Print
defects guide” and check for repeating defects. If
repeating defects are not appearing, print the Print
Quality Test Pages.
the cartridge. Repeat this procedure multiple
times until the print remains faded. When the
print remains faded, replace the print cartridge.
• Change the Toner Darkness setting in the
Quality menu.
Toner fog or background shading
appears on the page
Printing the print defects guide
1 Touch the help icon (?).
2 Touch Print Defects Guide.
• Change the Brightness setting in the Quality
menu.
• Change the Contrast setting in the Quality
menu.
• If you are printing on an uneven print surface,
change the Paper Weight and Paper Texture
settings in the Paper menu.
Printing the print quality test
pages
3 Turn the MFP off.
• 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.
• Verify the environment is Class B.
• Replace the charge rolls.
• Replace the print cartridge.
4 Hold down the number 2 and number 6 keys on
• Verify the correct print media is being used.
• Verify you are using the correct printer drivers.
• Verify the environment is Class B.
the numeric pad.
5 Continue to hold the buttons, and turn the MFP
on.
Toner smears or print comes off
the page
Hold the buttons for about 10 seconds while the
MFP is powering up, then release the buttons.
The MFP enters the Configuration menu.
6 Touch Print Quality Pages.
7 Touch Exit Configuration Menu.
Entire page is white
The printer restarts and returns to the home
page.
Solving print quality
problems
• If you are printing on an uneven print surface,
change the Paper Weight and Paper Texture
settings in the Paper menu.
• Verify the print media is within the printer
specifications. See the User’s Guide for more
details.
Print is too light.
• Make sure the packaging material is removed
from the print cartridge.
• Check the print cartridge to be sure it is installed
correctly.
Toner appears on the back of the
printed page
Toner is on the transfer roll. To help prevent this, do
not load print media that is smaller than the page
size of the job to be printed.
• 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. 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
Open and close the printer top front cover to run the
printer setup cycle and clean the transfer roll.
Streaks appear on the page
Characters have jagged or uneven
edges
The job prints, but the top and side
margins are incorrect
• 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. 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 Print Resolution setting in the
Quality menu to 600 dpi, 1200 Image Q,
1200 dpi, or 2400 Image Q.
• Make sure the Paper Size setting in the Paper
menu is correct.
• Make sure the margins are set correctly in your
software application.
• Enable Enhance Fine Lines.
• If you are using downloaded fonts, verify the
fonts are supported by the printer, the host
computer, and the software application.
• Verify the print media type and print tray type
settings match.
• Verify you are using the correct printer drivers.
• Verify the environment is Class B.
Ghost images appear
• Make sure the Paper Type setting in the Paper
menu is correct.
• Verify the environment is Class B.
• Replace the charge rolls.
• Replace the print cartridge.
• Replace the photoconductor kit.
Printing is too dark
Part or all of the page is printed in
black
Some of the print is cut off on the
sides, top, or bottom of the media
Move the guides in the tray to the proper positions for
the size loaded.
Print is skewed or inappropriately
slanted
Move the guides in the tray to the proper positions for
the size loaded.
• 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.
• Verify the environment is Class B.
Check the print cartridge to see if it is installed
correctly.
Transparency print quality is poor.
• Use only transparencies recommended by the
printer manufacturer.
• Make sure the Paper Type setting in the Paper
menu is set to Transparency.
Touch the left arrow to remove more shadow
detail.
Solving copy quality
problems
Solving fax problems
The fax document takes a long
time to transmit
Touch Options, then under Content, change the
setting to Text, and then set the resolution to
Standard.
Solving scan quality
problems
Unwanted background is visible
Adjust the Background Removal setting under
Copy Options Advanced Imaging. Touch the
right arrow to remove more background.
The file size is too big when I scan
a document to the network
The images on the fax I sent are
not clear
Touch Options, then under Content, change the
setting to Text/Photo or Photo.
Unwanted patterns (Moire) appear
when a document is copied using
Photograph mode
Change the content mode to Printed Image under
Copy Options Content.
• Touch Options, then under Resolution,
decrease the output resolution.
• Touch Options, then under Content, change
the Color option to black and white.
• Touch Options, then under Content, change
the setting to Text.
Increase the output resolution.
Note: This will increase the amount of
time required for the scan and will
increase the quality of the fax
output.
Vertical or horizontal lines are
noticed on copied pages
Text characters do not look sharp
when I scan a document to the
network
Clean the ADF scanner glass and backing material.
Caller ID is not shown
• Touch Options, then under Resolution,
Black text is too light or
disappearing
increase the output resolution.
• Touch Options, then under Content, change
the setting to Text.
If your region supports caller ID, you may have to
change the default setting. There are two settings
available, FSK (pattern 1) and DTMF (pattern 2).
Contact your telecommunications company to
determine which pattern or switch setting to use.
• Adjust the Darkness setting under the Copy
menu. Touch the right arrow to increase the
darkness setting.
• Change the content mode to Text under
Copy Options Content.
Black text is too light or
disappearing
• Adjust the Darkness setting. Touch the right
arrow to increase the darkness setting.
• Change the content mode to Text.
• Adjust the Background Removal setting under
Advanced Imaging. Touch the left arrow to
remove less background.
• Adjust the Background Removal setting under
Copy Options Advanced Imaging.
Touch the left arrow to remove less background.
• Adjust the Contrast setting under Copy
Options Advanced Imaging. Touch the
right arrow to add more contrast.
• Adjust the Contrast setting under Advanced
Imaging. Touch the right arrow to add more
contrast.
• Adjust the Shadow Detail setting under
Copy Options Advanced Imaging.
Touch the left arrow to decrease shadow detail.
• Adjust the Shadow Detail setting under
Advanced Imaging. Touch the left arrow to
decrease shadow detail.
The copy looks washed out or
overexposed
• Adjust the Background Removal setting under
Copy Options Advanced Imaging.
Touch the left arrow to remove less background.
• Adjust the Shadow Detail setting under
Copy Options Advanced Imaging.
Unwanted background is visible
Adjust the Background Removal setting under
Advanced Imaging. Touch the right arrow to remove
more background.
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