Samsung SCX-4521FG manual Condition

Condition		Suggested solutions
Vertical lines If black vertical streaks appear on the page:
		• The drum inside the toner cartridge has probably been
	AaBbCc	scratched. Remove the toner cartridge and install a
	AaBbCc	new one. See “Replacing the Toner Cartridge” on
	AaBbCc	page 8.4.
	AaBbCc
	AaBbCc	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.

Gray			If the amount of background shading becomes
background			unacceptable:
			• Change to a lighter weight paper. See “Paper
		AaBbCc	Specifications” on page 10.3.
		AaBbCc	• Check the machine’s environment: very dry (low
		AaBbCc	humidity) or high humidity (higher than 80% RH)
		AaBbCc	conditions can increase the amount of background
		AaBbCc	shading.
			• Remove the old toner cartridge and install a new one.
			See “Replacing the Toner Cartridge” on page 8.4.
Toner smear			• Clean the inside of the machine. See “Cleaning the
			Inside” on page 8.2.
			• Check the paper type and quality. See “Paper
			Specifications” on page 10.3.
			• Remove the toner cartridge and install a new one. See
			“Replacing the Toner Cartridge” on page 8.4.
Vertical			If marks repeatedly appear on the printed side of the
repetitive			page at even intervals:
defects			• The toner cartridge may be damaged. If a repetitive
			mark occurs on the page, print a cleaning sheet several
	AaBbCc		times to clean the cartridge; see “Cleaning the Drum”
	AaBbCc		on page 8.5. After the printout, if you still have the
	AaBbCc		same problems, remove the toner cartridge and install
	AaBbCc		a new one. See “Replacing the Toner Cartridge” on
	AaBbCc
			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.

Condition

Background scatter

A

Misformed characters

Page skew

AaBbCc

AaBbCc

AaBbCc

AaBbCc

AaBbCc

Curl or wave

Wrinkles or creases

Suggested solutions

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 Specifications” on page 10.3.

•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 Specifications” on page 10.3.

•Turn over the stack of paper in the tray. Also try rotating the paper 180° in the tray.

9.9 Troubleshooting