Samsung ML-4050 Series manual Solving print quality problems

Condition	Possible cause	Suggested solutions
PDF file	Incompatibility	Printing the PDF file as an
does not	between the PDF	image may enable the file to
print	file and the	print. Turn on Print As Image
correctly-	Acrobat products.	from the Acrobat printing
some parts		options.
are missing		Note: It will take longer to print
in the		when you print a PDF file as an
graphics,
		image.
text or
illustrations.

Solving print quality problems

Dirt inside of the printer or improper paper loading may reduce print quality. See the table below to troubleshoot problems.

Condition	Suggested solutions
Light or faded	If a vertical white streak or faded area appears
print	on the page:

• The toner supply is low. You may be able to temporarily extend the toner cartridge life. See page 8.4. If this does not improve print quality, install a new toner cartridge.

•The paper may not meet paper specifications (for example, the paper is too moist or too

rough). See page 5.3.

•If the entire page is light, the print resolution setting is too light or toner save mode is on. Adjust the print resolution and toner save mode in the printer properties. See the Software section.

•If the entire page is faded with "Toner Low Replace Toner" message on LCD,

set "CLR Empty Msg." to "On" referring to page 8.6. In this case, you can keep printing but the quality cannot be guaranteed, and the product support is no longer provided.

•A combination of faded or smeared defects may indicate that the printer needs cleaning. See page 8.1.

•The surface of LSU may be dirty. Clean the LSU. See page 8.2.

Toner spots	•	The paper may not meet specifications (for
		example, the paper is too moist or too rough).
		See page 5.3.
	•	The transfer roller or paper path may be dirty.
		See page 8.1.

Condition		Suggested solutions
Dropouts	If generally rounded, faded areas 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. See page 5.3.
	•	The paper lot is bad. The manufacturing
		processes can cause some areas to reject
		toner. Try a different kind or brand of paper.

•The toner cartridge may be defective. See “Vertical repetitive defects” on the next page.

•If these steps do not correct the problems, contact a service representative.

Vertical lines	If black vertical streaks appear on the page:
	•	The drum inside the toner cartridge has
		probably been scratched. Install a new toner
		cartridge. See page 8.5.
	If white vertical streaks appear on the page:
	•	The surface of the LSU part inside the printer
		may be dirty. Clean the LSU. See page 8.2.
Gray	If the amount of background shading becomes
background	unacceptable, the procedures below may fix the
	problem.
	•	Change to lighter weight pages. See page 5.3.
	• Check the printer’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. See page 8.5.
Toner smear	•	Clean the inside of the printer. See page 8.1.
	•	Check the type and quality. See page 5.2.
	•	Remove the toner cartridge and install a new
		one. See page 8.5.

9.11 <Troubleshooting>