Samsung SCX-6555N Series White Spots, Vertical lines, Color or Black, Toner smear, Misformed

	CONDITION	SUGGESTED SOLUTIONS
White Spots		White spots appears on the page:
		• The paper is too rough and a lot of dirt from
		a paper falls to the inner devices within the
		machine, so the transfer roller may be dirty.
		Clean the inside of your machine. (See
		"Cleaning the transfer unit" on page 93.)
		Contact a service representative.
		• The paper path may need cleaning.
		Contact a service representative.
Vertical lines		If black vertical streaks appear on the page:
		• The surface(drum part) of the imaging unit
		inside the machine has probably been
		scratched. Remove the imaging unit and
		install a new one. (See "Replacing the
		imaging unit" on page 95.)
		If white vertical streaks appear on the page:
		• The surface of the LSU part inside the
		machine may be dirty. Clean the LSU.
		Contact a service representative.
Color or Black		If the amount of background shading becomes
background		unacceptable:
		• Change to a lighter weight paper. (See
		"Specification on print media" on page 33.)
		• Check the environmental conditions: very
		dry conditions (low humidity) or a high level
		of humidity (higher than 80% RH) can
		increase the amount of background
		shading.
		• Remove the old imaging unit and then,
		install a new one. (See "Replacing the
		imaging unit" on page 95.)

Toner smear	•	Clean the inside of the machine. Contact a
		service representative.
	•	Check the paper type and quality. (See
		"Specification on print media" on page 33.)

•Remove the imaging unit and then, install a

new one. (See "Replacing the imaging unit" on page 95.)

CONDITION	SUGGESTED SOLUTIONS
Vertical repetitive	If marks repeatedly appear on the printed side
defects	of the page at even intervals:

•The imaging unit may be damaged. If a

repetitive mark occurs on the page, run a cleaning sheet through several times to clean the cartridge; contact a service representative. After the printout, if you still have the same problems, remove the imaging unit and then, install a new one. (See "Replacing the imaging unit" on page 95.)

•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 scatter Background scatter results from bits of toner
		randomly distributed on the printed page.
	A	• 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 in printer properties.

Misformed	• If characters are improperly formed and
characters	producing hollow images, the paper stock
	may be too slick. Try different paper. (See
	"Specification on print media" on page 33.)
	• If characters are improperly formed and
	producing a wavy effect, the scanner unit
	may need service. Contact a service
	representative.

Page skew	• Ensure that the paper is loaded properly.
	• Check the paper type and quality. (See
	"Specification on print media" on page 33.)
	• Ensure that the paper or other material is
	loaded correctly and the guides are not too
	tight or too loose against the paper stack.

112_Troubleshooting