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...

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...

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...

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.•...

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...

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...

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...

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...

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...

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....