Samsung SCX3405FWXAC Condition Suggested solutions Vertical lines, Black or color background

Printing quality problems

	Condition	Suggested solutions
Vertical lines		If black vertical streaks appear on the page:
		• The surface (drum part) of the toner cartridge inside the machine has probably been scratched. Remove the toner cartridge and
		install a new one (see "Replacing the toner cartridge" on page 77).
		If white vertical streaks appear on the page:
		• The surface of the LSU part inside the machine may be dirty. Clean the inside of your machine (see "Cleaning the machine" on page
		81). If these steps do not correct the problem, contact a service representative.
Black or color background		If the amount of background shading becomes unacceptable:
		• Change to a lighter weight paper.
		• Check the environmental conditions: very dry conditions or a high level of humidity (higher than 80% RH) can increase the amount
		of background shading.
		• Remove the old toner cartridge and install a new one (see "Replacing the toner cartridge" on page 77).
		• Thoroughly redistribute the toner (see "Redistributing toner" on page 75).
Toner smear		• Clean the inside of the machine (see "Cleaning the machine" on page 81).
		• Check the paper type and quality.
		• Remove the toner cartridge and install a new one (see "Replacing the toner cartridge" on page 77).

6. Troubleshooting 294