Samsung SCX-4321 Manual De Usuario

Troubleshooting

9.9

If black vertical streaks appear on the page:
• The drum inside the toner cartridge has probably been 

scratched. Remove the toner cartridge and install a 
new one. See “Replacing the Toner Cartridge” on 
page 8.4.

If white vertical streaks appear on the page:
• The surface of the LSU part inside the machine may be 

dirty. Clean the LSU (“Cleaning the Inside” on 
page 8.2). Contact a service representative.

If the amount of background shading becomes 
unacceptable:
• Change to a lighter weight paper. See “Paper 

• Check the machine’s environment: very dry (low 

humidity) or high humidity (higher than 80% RH) 
conditions can increase the amount of background 
shading.

• Remove the old toner cartridge and install a new one. 

• Clean the inside of the machine. See “Cleaning the 

• Check the paper type and quality. See “Paper 

• Remove the toner cartridge and install a new one. See 

If marks repeatedly appear on the printed side of the 
page at even intervals:
• The toner cartridge may be damaged. If a repetitive 

mark occurs on the page, print a cleaning sheet several 
times to clean the cartridge; see “Cleaning the Drum” 
on page 8.5. After the printout, if you still have the 
same problems, remove the toner cartridge and install 
a new one. See “Replacing the Toner Cartridge” on 
page 8.4.

• 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.

• If you use inferior quality paper; see “Cleaning the 

Drum” on page 8.5.

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Background 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.

• If background scatter covers the entire surface area of 

a printed page, adjust the print resolution through your 
software application or the printer properties.

• If characters are improperly formed and producing 

hollow images, the paper stock may be too slick. Try a 
different paper. See “Paper Specifications” on 
page 10.3.

• If characters are improperly formed and producing a 

wavy effect, the scanner unit may need service. For 
service, contact a service representative.

• Ensure that the paper is loaded properly.
• Check the paper type and quality. See “Paper 

• Ensure that the paper or other material is loaded 

correctly and the guides are not too tight or too loose 
against the paper stack.

• Ensure that the paper is loaded properly.
• Check the paper type and quality. Both high 

temperature and humidity can cause paper curl. See 
“Paper Specifications” on page 10.3.

• Turn over the stack of paper in the tray. Also try 

rotating the paper 180° in the tray.

• Ensure that the paper is loaded properly.
• Check the paper type and quality. See “Paper 

• Turn over the stack of paper in the tray. Also try 

rotating the paper 180° in the tray.

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