Samsung ML 2950ND User Manual

							Printing quality problems1116. Troubleshooting
Toner specks• The paper may not meet specifications; for example, the paper may be too moist or rough.
• The transfer roller may be dirty. Clean the inside of your machine.
• The paper path may need cleaning. Contact a service representative.
DropoutsIf faded areas, generally rounded, occur randomly on the page:
• A single sheet of paper may be defective. Try reprinting the job.
• The moisture content of the paper is uneven or the paper has moist spots on its surface. Try a different brand of 
paper.
• The paper lot is bad. The manufacturing processes can cause some areas to reject toner. Try a different kind or 
brand of paper.
• Change the printer option and try again. Go to Printing Preferences, click the Paper tab, and set type to Thick 
or Thicker (see Basic Guide for paper weights for each sheet).
If these steps do not correct the problem, contact a service representative.
White Spots If white spots appear on the page:
• The paper is too rough and a lot of dirt from paper falls to the inner components within the machine, so the 
transfer roller may be dirty. Clean the inside of your machine.
• The paper path may need cleaning. Clean the inside of your machine.
If these steps do not correct the problem, contact a service representative.
ConditionSuggested Solutions
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							Printing quality problems1126. Troubleshooting
Vertical linesIf black vertical streaks appear on the page:
• The surface (drum part) of the toner cartridge inside the machine has probably been scratched. Remove the 
toner cartridge and install a new one.
If white vertical streaks appear on the page:
• The surface of the LSU part inside the machine may be dirty. Clean the inside of your machine. If these steps do 
not correct the problem, contact a service representative.
Black backgroundIf the amount of background shading becomes unacceptable:
• Change to a lighter weight paper.
• Check the environmental conditions: very dry conditions or a high level of humidity (higher than 80% RH) can 
increase the amount of background shading.
• Remove the old toner cartridge and install a new one.
• Thoroughly redistribute the toner (see Basic Guide).
Toner smear• Clean the inside of the machine.
• Check the paper type and quality.
• Remove the toner cartridge and install a new one.
ConditionSuggested Solutions
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							Printing quality problems1136. Troubleshooting
Vertical repetitive defectsIf marks repeatedly appear on the printed side of the page at even intervals:
• The toner cartridge may be damaged. If you still have the same problem, remove the toner cartridge and, install 
a new one.
• Parts of the machine may have toner on them. If the defects occur on the back of the page, the problem will 
likely correct itself after a few more pages.
• The fusing assembly may be damaged. Contact a service representative.
Background scatterBackground scatter results from bits of toner randomly distributed on the printed page. 
• The paper may be too damp. Try printing with a different batch of paper. Do not open packages of paper until 
necessary so that the paper does not absorb too much moisture.
• If background scatter occurs on an envelope, change the printing layout to avoid printing over areas that have 
overlapping seams on the reverse side. Printing on seams can cause problems.
Or select Thick Envelope from the Printing Preferences window (see Basic Guide).
• If background scatter covers the entire surface area of a printed page, adjust the print resolution through your 
software application or in Printing Preferences. Ensure the correct paper type is selected. For example: If 
Thicker Paper is selected, but Plain Paper actually used, an overcharging can occur causing this copy quality 
problem.
• If you are using a new toner cartridge, redistribute the toner first. 
ConditionSuggested Solutions
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							Printing quality problems1146. Troubleshooting
Toner particles are around 
bold characters or picturesThe toner might not adhere properly to this type of paper.
• Change the printer option and try again. Go to Printing Preferences, click the Paper tab, and set the paper type 
to Recycled. Ensure the correct paper type is selected. For example: If Thicker Paper is selected, but Plain 
Paper actually used, an overcharging can occur causing this copy quality problem.
Misformed characters• If characters are improperly formed and producing hollow images, the paper stock may be too slick. Try 
different paper.
Page skew• Ensure that the paper is loaded properly.
• Check the paper type and quality.
• Ensure that the guides are not too tight or too loose against the paper stack.
ConditionSuggested Solutions
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							Printing quality problems1156. Troubleshooting
Curl or wave• Ensure that the paper is loaded properly.
• Check the paper type and quality. Both high temperature and humidity can cause paper curl.
• Turn the stack of paper over in the tray. Also try rotating the paper 180° in the tray.
Wrinkles or creases• Ensure that the paper is loaded properly.
• Check the paper type and quality.
• Turn the stack of paper over in the tray. Also try rotating the paper 180° in the tray.
Back of printouts are dirty• Check for leaking toner. Clean the inside of the machine.
ConditionSuggested Solutions
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							Printing quality problems1166. Troubleshooting
Solid color or black pages• The toner cartridge may not be installed properly. Remove the cartridge and reinsert it.
• The toner cartridge may be defective. Remove the toner cartridge and install a new one.
• The machine may require repairing. Contact a service representative.
Loose toner• Clean the inside of the machine.
• Check the paper type and quality.
• Remove the toner cartridge and then, install a new one.
If the problem persists, the machine may require repair. Contact a service representative.
Character voidsCharacter voids are white areas within parts of characters that should be solid black:
• If you are using transparencies, try another type of transparency. Because of the composition of transparencies, 
some character voids are normal. 
• You may be printing on the wrong surface of the paper. Remove the paper and turn it around. 
• The paper may not meet paper specifications.
ConditionSuggested Solutions
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							Printing quality problems1176. Troubleshooting
 
Horizontal stripesIf horizontally aligned black streaks or smears appear:
• The toner cartridge may be installed improperly. Remove the cartridge and reinsert it.
• The toner cartridge may be defective. Remove the toner cartridge and install a new one.
If the problem persists, the machine may require repairing. Contact a service representative.
CurlIf the printed paper is curled or paper does not feed into the machine:
• Turn the stack of paper over in the tray. Also try rotating the paper 180° in the tray. 
• Change the printer’s paper option and try again. Go to Printing Preferences, click the Paper tab, and set type 
to Thin.
•An unknown image 
repetitively appears on 
a few sheets
•Loose toner
•Light print or 
contamination occursYour machine is probably being used at an altitude of 1,000 m (3,281 ft) or above.
The high altitude may affect the print quality, such as loose toner or light imaging. Change the altitude setting for 
your machine (See "Altitude adjustment" on page 76).
ConditionSuggested Solutions
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							1186. TroubleshootingOperating system problems
1 
Common Windows problems
 
 
 
Refer to the Microsoft Windows 2000/XP/2003/Vista User’s Guide that came with your computer for further information on Windows 
error messages.
 
ConditionSuggested solutions
“File in Use” message 
appears during 
installation.Exit all software applications. Remove all software from the startup group, then restart Windows. Reinstall the 
printer driver.
“General Protection 
Fault”, “Exception OE”, 
“Spool 32”, or “Illegal 
Operation” messages 
appear.Close all other applications, reboot Windows and try printing again.
“Fail To Print”, “A printer 
timeout error occurred” 
message appear.These messages may appear during printing. Just keep waiting until the machine finishes printing. If the message 
appears in ready mode or after printing has completed, check the connection and/or whether an error has 
occurred.
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							Operating system problems1196. Troubleshooting
2 
Common Macintosh problems
 
 
 
Refer to the Macintosh User’s Guide that came with your computer for further information on Macintosh error messages.
 
ConditionSuggested solutions
The machine does not print PDF 
files correctly. Some parts of 
graphics, text, or illustrations are 
missing.Printing the PDF file as an image may enable the file to print. Turn on Print As Image from the Acrobat 
printing options. 
 
It will take longer to print when you print a PDF file as an image.
 
Some letters are not displayed 
normally during cover page 
printing.Mac OS cannot create the font while printing the cover page. The English alphabet and numbers are 
displayed normally on the cover page.
When printing a document in 
Macintosh with Acrobat 
Reader 6.0 or higher, colors print 
incorrectly.Make sure that the resolution setting in your machine driver matches the one in Acrobat Reader.
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							Operating system problems1206. Troubleshooting
3 
Common Linux problems
 
 
ConditionSuggested solutions
The machine does not 
print.• Check if the printer driver is installed in your system. Open Unified Driver Configurator and switch to the 
Printers tab in the Printers configuration window to look at the list of available machines. Make sure that 
your machine is displayed on the list. If not, open Add new printer wizard to set up your device.
• Check if the machine is started. Open Printers configuration and select your machine from the printers list. 
Look at the description in the Selected printer pane. If its status contains Stopped, press the Start button. 
Normal operation of the machine should be restored. The “stopped” status might be activated when some 
problems in printing occur. 
• Check if your application has special print options such as “-oraw”. If “-oraw” is specified in the command line 
parameter, then remove it to print properly. For Gimp front-end, select “print” -> “Setup printer” and edit the 
command line parameter in the command item.
The machine does not 
print whole pages, and 
output is printed on half 
the page.It is a known problem that occurs when a color machine is used on version 8.51 or earlier of Ghostscript, 64-bit 
Linux OS, and has been reported to bugs.ghostscript.com as Ghostscript Bug 688252.The problem is solved in 
AFPL Ghostscript v. 8.52 or above. Download the latest version of AFPL Ghostscript from http://sourceforge.net/
projects/ghostscript/ and install it to solve this problem.
“Cannot open port device 
file” error message 
appears when printing a 
document.Avoid changing print job parameters (e.q., via LPR GUI) while a print job is in progress. Known versions of CUPS 
server break the print job whenever print options are changed and then try to restart the job from the beginning. 
Since Unified Linux Driver locks the port while printing, the abrupt termination of the driver keeps the port locked 
and unavailable for subsequent print jobs. If this situation occurs, try to release the port by selecting Release port 
in the Port configuration window.
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