Samsung ML-4550, ML-4551ND manual AaBbCc, AaBbC c

Condition Suggested solutions

Vertical	If marks repeatedly appear on the printed side of
repetitive	the page at even intervals:
defects	•	The toner cartridge may be damaged. If a
AaBbC c		repetitive mark occurs on the page, print a
		cleaning sheet several times to clean the
AaBbC c		cartridge; see page 8.3. After the printout, if
AaBbC c		you still have the same problems, install a new
AaBbC c	•	toner cartridge. See page 8.5.
AaBbC c		Parts of the printer 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	Background scatter results from bits of toner
scatter	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 via the printer properties window.

Misformed	•	If characters are improperly formed and
characters		producing hollowed images, the paper stock
		may be too slick. Try a different paper. See
		page 5.3.
	•	If characters are improperly formed and
		producing a wavy effect, the scanner unit may
		need service. Verify that it also occurs on a
		demo page (see page 2.8). For service,
		contact a service representative.
Page skew	•	Ensure that the paper is loaded properly.

Aa	BbCc	• Check the paper type and quality. See page
		5.2.
		• Ensure that the paper or other media is loaded
AaBbCc
		correctly and the guides are not too tight or
AaBbCc
		too loose against the paper stack.
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Condition		Suggested solutions
Curl or wave	•	Ensure that the paper is loaded properly.
	•	Check the type and quality. Both high
		temperature and humidity can cause paper
		curl. See page 5.2.
	•	Turn over the stack of paper in the tray. Also
		try rotating the paper 180° in the tray.
	•	Try printing to the rear cover (face-up).
Wrinkles or	•	Ensure that the paper is loaded properly.
creases	•	Check the paper type and quality. See page
		5.2.
	• Open the rear cover and try printing to the rear
		cover (face-up).

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

Back of	•	The transfer roller may be dirty. See page 8.1.
printouts are	•	Check for leaking toner. Clean the inside of
dirty		the printer.

Solid color or	• The toner cartridge may not be installed
Black pages	properly. Remove the cartridge and reinsert.

A	•	The toner cartridge may be defective and
		need replacing. Install a new toner cartridge.
	•	The printer may require repair. Contact a
		service representative.

Loose toner	•	Clean the inside of the printer.
	•	Check the paper type and quality. See page
		5.2.

•Install a new toner cartridge. See page 8.5.

•If the problem persists, the printer may require

repair. Contact a service representative.

9.12 <Troubleshooting>