Lexmark C782n XL User Manual

							Solving option problems
91
Troubleshooting
Solving high capacity feeder problems
ProblemSolution
The paper tray does not raise when the 
loading door is closed, or the paper tray does 
not lower when the door is opened and the 
paper tray button is pushed.Check the following:
• The printer is properly attached to the high capacity feeder.
• The printer is powered on.
• The power cord is plugged firmly into the back of the high capacity 
feeder.
• The power cord is plugged into an outlet.
• The outlet has power.
The paper tray lowers unexpectedly. Check to see if your printer is out of paper or has a jam.
More than one sheet of paper is fed or a sheet 
is fed improperly.Remove the paper in the printer paper path, and check the stack to 
ensure the paper has been loaded properly. Be sure to remove the top 
and bottom sheets of each ream of paper that is loaded.
A jam occurs.
Rubber feed rollers do not turn to advance 
paper.Check the following:
• The power cord is plugged firmly into the back of the high capacity 
feeder.
• The power cord is plugged into an outlet.
• The outlet has power.
Consistent misfeeds or jams in the feeder. Try the following:
• Flex the paper.
• Turn the print media over.
Check the following:
• Feeder is properly installed.
• Paper is loaded correctly.
• Paper is not damaged.
• Paper meets specifications.
• Guides are positioned correctly for the paper size selected.
Service messages  A service message indicates printer failure that may require service. 
Turn the printer off, wait about 10 seconds, and then turn the printer on.
If the error recurs, write down the error number, the problem, and a 
detailed description. Call 1-800-LEXMARK for service.
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							Solving paper feed problems
92
Troubleshooting
Solving paper feed problems
Solving print quality problems
To help isolate print quality problems, print the Print Quality Test Pages.
1Turn the printer off.
2Press   and  . Hold them while you turn the printer on, and until the Performing Self Test message 
appears.
Config Menu appears.
3Press  until   Prt Quality Pgs appears, and then press .
The pages are formatted. The Printing Quality Test Pages message appears, then the pages print. The 
message remains on the operator panel until all the pages print.
After the Print Quality Test Pages print, to exit the Config Menu:
4Press  until  Exit Config Menu appears, and then press  to complete the procedure.
SymptomCauseSolution
Paper frequently jams.  You are using paper that does not 
meet the printer specifications.Use recommended paper and other specialty media.
See the Card Stock & Label Guide available on the 
Lexmark Web site at www.lexmark.com for 
detailed specifications.
For information that can help prevent jams from 
occurring, see Avoiding jams.
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.
See Loading the trays or Loading the 
multipurpose feeder for more information.
Guides in the selected tray are not 
set to the appropriate position for 
the size paper loaded.Move the guides in the tray to the correct position.
For detailed instructions, see Loading the trays.
The paper has absorbed moisture 
due to high humidity.Load paper from a fresh package.
Store paper in its original wrapper until you load it.
See Storing paper for more information.
The Paper Jam 
message remains after 
you remove the jammed 
paper. You have not pressed
  or 
have not cleared the entire paper 
path.Clear paper from the entire paper path, and then 
press .
For more information, see Clearing the entire 
paper path.
The page that jammed 
does not reprint after you 
clear the jam. Jam Recovery in the Setup Menu/
Print Recovery section is set to 
Off.Set Jam Recovery to Auto or On.
For more information, see the Menus and Messages 
Guide.
Blank pages feed into 
the output bin. An incorrect media type is loaded 
in the tray being printed from.Load the correct type media for your print job, or 
change the Paper Type to match the type of media 
loaded.
For more information, see the Menus and Messages 
Guide.
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							Solving print quality problems
93
Troubleshooting
The information in the following table may help you solve print quality problems. If these suggestions still do not correct the 
problem, call for service. You may have a printer part that requires adjustment or replacement.
SymptomCauseSolution
Color misregistration Color has shifted outside of the 
appropriate area or has been 
superimposed over another color 
area.Open the printer door, and make sure all four 
packaging tabs are removed.
Top to Bottom or Left to Right:
1Re-seat the cartridges by removing them from the 
printer and then reinserting them.
2Invoke a Color Adjust operation from the Settings 
Æ Quality menu.
Repeating defects Either the print cartridges are 
defective, the image transfer unit 
and transfer roller are defective, 
or the fuser is defective.Marks occur repeatedly only in one color and 
multiple times on a page:
• Replace the cartridge if the defects occur every:
– 38 mm (1.5 in.)
– 48 mm (1.9 in.)
– 97 mm (3.8 in.)
Marks occur down the page repeatedly in all 
colors:
• Replace the transfer roll if the defects occur every 
60 mm (2.4 in.)
• Check the first transfer bellcranks and springs or 
replace the image transfer unit if the defects 
occur every 101 mm (4 in.)
• Replace the fuser if the defects occur every 
148 mm (5.8 in.)
Marks occur on every third or sixth page in any 
color:
Replace the image transfer unit.
White or colored line Either the print cartridges are 
defective, the image transfer unit 
and transfer roller are defective, 
or the fuser is defective.1Replace the color print cartridge that is causing 
the line.
2If you still have the problem, replace the image 
transfer unit and transfer roller.
3If you still have the problem, replace the fuser.
ABCDEABCDE
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							Solving print quality problems
94
Troubleshooting
Streaked horizontal lines The print cartridges, the transfer 
roller, image transfer unit, or fuser 
may be defective, empty, or worn.Replace the print cartridge, the transfer roller, the 
image transfer unit, or fuser as needed.
From the printer operator panel, print the repetitive 
defects guide to determine which component needs 
to be replaced.
Streaked vertical lines • Toner is smeared before fusing 
to the paper.
• The print cartridge is defective.• If paper is stiff, try feeding from another tray.
• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
Print irregularities • Paper has absorbed moisture 
due to high humidity.
• You are using paper that does 
not meet the printer 
specifications.
• The image transfer unit and 
transfer roller are worn or 
defective.
• The fuser is worn or defective.• Load paper from a fresh package in the paper 
tray.
• Avoid textured paper with rough finishes.
• Make sure the printer paper type, paper texture, 
and paper weight settings match the type of 
paper you are using.
• Replace the image transfer unit and transfer 
roller.
• Replace the fuser.
SymptomCauseSolution
ABCDE
ABCDE
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							Solving print quality problems
95
Troubleshooting
Print too light • Paper settings may be 
incorrect.
• The Toner Darkness setting is 
too light.
• You are using paper that does 
not meet the printer 
specifications.
• The print cartridges are low on 
toner.
• The print cartridges are 
defective or have been 
installed in more than one 
printer.• Make sure the printer paper type, paper texture, 
and paper weight settings match the type of 
paper you are using.
• The default Paper Weight setting in the Paper 
Menu is Normal. For paper less than 20 lb bond 
(75 g/m
2 ), choose the Light setting. For 28 lb 
bond to 47 lb bond (105 g/m2 to 175 g/m2 ), 
choose the Heavy setting.
• Select a different Toner Darkness setting from the 
printer driver before sending the job to print.
• Scroll to the Color Adjust setting in the Quality 
Menu and press Select to adjust the color.
• Load paper from a new package.
• Avoid textured paper with rough finishes.
• Make sure the paper you load in the trays is not 
damp.
• Shake the specified print cartridge to utilize the 
remaining toner. For more information, see Print 
cartridges.
• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
Print too dark • The Toner Darkness setting is 
too dark.
• The print cartridges are 
defective.• Select a different Toner Darkness setting from the 
printer driver before sending the job to print.
• Scroll to the Color Adjust setting in the Quality 
Menu and press Select to adjust the color.
• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
Transparency print 
quality is poor
(Print has inappropriate 
light or dark spots, toner 
is smeared, horizontal or 
vertical light bands 
appear, or color does not 
project.)• You are using transparencies 
that do not meet the printer 
specifications.
• The Paper Type setting for the 
tray you are using is set to 
something other than 
transparency.• Use only transparencies recommended by the 
printer’s manufacturer.
• Make sure the Paper Type setting is set to 
Transparency.
Toner specks • The print cartridges are 
defective.
• The transfer roller is worn or 
defective.
• The image transfer unit is worn 
or defective.
• The fuser is worn or defective.
• Toner is in the paper path.• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
• Replace the transfer roller.
• Replace the image transfer unit.
• Replace the fuser.
• Call for service.
Toner rubs off the paper 
easily when you handle 
the sheets.• The Type setting is wrong for 
the type of paper or specialty 
media you are using.
• The Texture setting is wrong for 
the type of paper or specialty 
media you are using.
• The Weight setting is wrong for 
the type of paper or specialty 
media you are using.
• The fuser is worn or defective.• Change Paper Type to match the paper or 
specialty media you are using.
• Change Paper Texture from Normal to Smooth or 
Rough.
• Change Paper Weight from Plain to CardStock 
(or other appropriate weight).
• Replace the fuser.
SymptomCauseSolution
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							Solving print quality problems
96
Troubleshooting
Gray background • The Toner Darkness setting is 
too dark.
• The print cartridges are 
defective.• Select a different Toner Darkness setting from the 
printer driver before sending the job to print.
• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
Uneven print density • The print cartridges are 
defective.
• The transfer roller is worn or 
defective.
• The image transfer unit is worn 
or defective.• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
• Replace the transfer roller.
• Replace the image transfer unit.
Ghost Images Toner level is low in the print 
cartridges.Replace the print cartridge that corresponds to the 
color displayed on the control panel.
Clipped images
(Some of the print is cut 
off on the sides, top, or 
bottom of the paper.)Guides in the selected tray are set 
for a different size paper than 
what is loaded in the tray.Move the guides in the tray to the proper positions 
for the size loaded.
Incorrect margins • Guides in the selected tray are 
set for a different size paper 
than what is loaded in the tray.
• 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.• Move the guides in the tray to the proper positions 
for the size loaded.
• Set the Paper Size to match the media in the tray.
Skewed print
(Print is inappropriately 
slanted.)• Guides in the selected tray are 
not in the correct position for 
the paper size loaded in the 
tray.
• You are using paper that does 
not meet the printer 
specifications.• Move the guides in the tray to the proper positions 
for the size loaded.
• See the Card Stock & Label Guide available on 
the Lexmark Web site at www.lexmark.com for 
detailed specifications.
• For more information, see Media specifications.
Blank pages The print cartridges are defective 
or empty.Replace the print cartridge that corresponds to the 
color displayed on the control panel.
SymptomCauseSolution
ABCDE
ABCDE
ABCDE
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							Solving color quality problems
97
Troubleshooting
Solving color quality problems
This section helps answer some basic color-related questions and describes how some of the features provided in the 
Quality Menu can be used to solve typical color problems.
Note:See the quick reference page entitled “Print quality and troubleshooting guide” which provides 
solutions for common print quality problems, some of which may affect the color quality of the printed 
output.
Frequently asked questions (FAQ) about color printing
What is RGB color?
Red, green, and blue light can be added together in various amounts to produce a large range of colors observed in nature. 
For example, red and green light can be combined to create yellow light. Televisions and computer monitors create colors 
in this manner. RGB color is a method of describing colors by indicating the amount of red, green, and blue light needed to 
reproduce a particular color.
What is CMYK color?
Cyan, magenta, yellow, and black inks or toners can be printed in various amounts to produce a large range of colors 
observed in nature. For example, cyan and yellow can be combined to create green. Printing presses, inkjet printers, and 
color laser printers create colors in this manner. CMYK color is a method of describing colors by indicating the amount of 
cyan, magenta, yellow, and black needed to reproduce a particular color.
How is color specified in a document to be printed?
Software applications typically specify document color using RGB or CMYK color combinations. Additionally, they 
commonly let users modify the color of each object in a document. Since the procedures to modify colors vary depending 
on the application, see the software application Help section for instruction.
How does the printer know what color to print?
When a user prints a document, information describing the type and color of each object in the document is sent to the 
printer. The color information is passed through color conversion tables that translate the color into appropriate amounts of 
cyan, magenta, yellow, and black toner needed to produce the desired color. The object type information lets different color 
conversion tables be used for different types of objects. For example, it is possible to apply one type of color conversion 
table to text while applying a different color conversion table to photographic images. Solid color pages • The print cartridges are 
defective.
• Your printer requires servicing.• Replace the print cartridge that corresponds to 
the color displayed on the control panel.
• Call for service.
The paper curls badly 
once it prints and exits to 
a bin.• The Type, Texture, and Weight 
settings are not appropriate for 
the type of paper or specialty 
media you are using.
• The paper has been stored in a 
high humidity environment.• Change Paper Type, Paper Texture, and Paper 
Weight to match the paper or specialty media 
loaded in the printer.
• Load paper from a fresh package.
• Store paper in its original wrapper until you use it.
• For more information, see Storing paper.
SymptomCauseSolution
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							Solving color quality problems
98
Troubleshooting
Should I use the PostScript or PCL emulation driver for the best color? What driver 
settings should I use for the best color?
The PostScript driver is strongly recommended for best color quality. The default settings in the PostScript driver provide 
preferred color quality for the majority of printouts.
Why doesnt the printed color match the color I see on the computer screen?
The color conversion tables used in Auto Color Correction mode generally approximate the colors of a standard 
computer monitor. However, because of technology differences that exist between printers and monitors, there are many 
colors that can be generated on a computer screen that cannot be physically reproduced on a color laser printer. Color 
match can also be affected by monitor variations and lighting conditions. See the response to the question How can I 
match a particular color (such as a color in a corporate logo)? on page 99 for recommendations on how the printer 
Color Samples pages may be useful in solving certain color-matching problems.
The printed page appears tinted. Can I slightly adjust the color?
Sometimes a user may consider printed pages to appear tinted (for example, everything printed seems to be too red). This 
can be caused by environmental conditions, paper type, lighting conditions, or user preference. In these instances, Color 
Balance may be used to create more preferable color. Color Balance provides the user with the ability to make subtle 
adjustments to the amount of toner being used in each color plane. Selecting positive (or negative) values for cyan, 
magenta, yellow, and black under the Color Balance menu will slightly increase (or decrease) the amount of toner used for 
the chosen color. For example, if a user believes the overall printed page to be too red, then decreases to both magenta 
and yellow could potentially improve color preference.
Is it possible to increase the gloss in the printed output?
Obtain additional gloss by printing using the 1200 dpi Print Resolution Setting.
My color transparencies seem dark when projected. Is there anything I can do to 
improve the color?
This problem most commonly occurs when projecting transparencies with reflective overhead projectors. To obtain the 
highest projected color quality, transmissive overhead projectors are recommended. If a reflective projector must be used, 
then adjusting Toner Darkness settings to 1, 2, or 3 will lighten the transparency. Be sure to print on the recommended 
type of color transparencies. For more information, see “Understanding paper and specialty media guidelines” in the User’s 
Guide on the Software and DocumentationCD.
Color Saver must be Off to adjust Toner Darkness.
What is Manual Color Correction?
The color conversion tables applied to each object on the printed page when using the default Auto Color Correction 
setting generate preferred color for the majority of documents. Occasionally, a user may want to apply a different color 
table mapping. This customization is accomplished using the Manual Color menu and the Manual Color Correction setting.
Manual Color Correction applies the RGB and CMYK color conversion table mappings as defined in the Manual Color 
menu. Users may select any of five different color conversion tables available for RGB objects (sRGB Display, Display—
True Black, sRGB Vivid, Off, and Vivid) and any of four different color conversion tables available for CMYK objects 
(US CMYK, Euro CMYK, Vivid CMYK, and Off).
Note:The Manual Color Correction setting is not useful if the software application does not specify colors 
with RGB or CMYK combinations, or in certain situations where the software application or the 
computer operating system adjusts the colors specified in the application through color management.
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							Solving color quality problems
99
Troubleshooting
How can I match a particular color (such as a color in a corporate logo)?
Occasionally, users have a need for the printed color of a particular object to closely match a specific color. A typical 
example of this is when a user is trying to match the color of a corporate logo. While instances can occur in which the 
printer cannot exactly reproduce the desired color, users should be able to identify adequate color matches for the majority 
of cases. The Color Samples menu item can provide useful information in helping to solve this particular type of color-
matching problem.
The nine Color Samples values correspond to color conversion tables in the printer. Selecting any of the Color Samples 
values generates a multiple-page printout consisting of hundreds of colored boxes. Either a CMYK or RGB combination is 
located on each box, depending on the table selected. The observed color of each box is obtained by passing the CMYK or 
RGB combination labeled on the box through the selected color conversion table.
The user can examine the color samples pages and identify the box whose color is the closest to the desired color. If the 
user finds a box whose color is close to the desired color match, but the user would like to scan the colors in that area in 
more detail, then the user can access the Detailed Color Samples by using the printer Embedded Web Server interface, 
which is only available on network models.
The color combination labeled on the box can then be used for modifying the color of the object in a software application. 
The software application Help section provides instructions for modifying the color of an object. Manual Color 
Correction may be necessary to utilize the selected color conversion table for the particular object.
Which Color Samples pages to use for a particular color-matching problem depends on the Color Correction setting being 
used (Auto, Off, or Manual), the type of object being printed (text, graphics, or images), and how the color of the object is 
specified in the software application (RGB or CMYK combinations). When the printer Color Correction setting is set to 
Off, the color is based on the print job information; no color conversion is implemented. The following table identifies which 
Color Samples pages to use.
Note:The Color Samples pages are not useful if the software application does not specify colors with RGB 
or CMYK combinations. Additionally, certain situations exist where the software application or the 
computer operating system adjusts the RGB or CMYK combinations specified in the application 
through color management. The resulting printed color may not be an exact match of the Color 
Samples pages.
Color specification of
object being printedClassification of
object being printedPrinter Color
Correction settingColor Samples pages to print
and use for color matching
RGB Text Auto sRGB Vivid
Manual Manual Color RGB Text Setting
Graphic Auto sRGB Vivid
Manual Manual Color RGB Graphics Setting
Image Auto sRGB Display
Manual Manual Color RGB Image Setting
CMYK Text Auto US CMYK or EURO CMYK
Manual Manual Color CMYK Text Setting
Graphic Auto US CMYK
Manual Manual Color CMYK Graphics Setting
Image Auto US CMYK
Manual Manual Color CMYK Image Setting
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							Solving color quality problems
100
Troubleshooting
What are Detailed Color Samples and how do I access them?
This information applies to network models only.
Detailed Color Samples are pages similar to the default pages of color samples accessible from the Quality Menu on the 
printer operator panel or from the Configuration Menu in the printer Embedded Web Server. The default color samples 
accessed by these methods have an increment value of 10 percent for Red (R), Green (G), and Blue (B) values. 
Collectively, these values are known as RGB color. If the user finds a value on the pages that is close, but would like to 
scan more colors in a nearby area, the user can use the Detailed Color Samples to input the desired color value and a 
more specific or lower increment value. This lets the user print multiple pages of colored boxes that surround a specific 
color of interest.
To access the pages of Detailed Color Samples, use the printer Embedded Web Server interface. Select the Color 
Samples option within the Configuration Menu. Nine color conversion table options and three buttons called Print, Detailed, 
and Reset are shown on the options screen.
If the user selects a color conversion table and presses the Print button, the printer prints the default color samples pages. 
If the user selects a color conversion table and presses the Detailed button, a new interface becomes available. The 
interface lets the user enter individual R, G, and B values of the specific color of interest. The user can also enter an 
increment value that defines the difference between the RGB value that each color box differs by. If the user selects Print, 
a printout generates which consists of the user-specified color and the colors that exist near this color based on the 
increment value.
This process can be duplicated for Cyan (C), Magenta (M), Yellow (Y), and Black (K) color conversion tables, too. 
Collectively, these values are known as CMYK color. The default increment is 10 percent for Black and 20 percent for 
Cyan, Magenta, and Yellow. The increment value defined by the user for Detailed Color Samples applies to Cyan, 
Magenta, Yellow, and Black.
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