Samsung SCX-4100 manual If black vertical streaks appear on, See Replacing the Toner Cartridge on

Condition	Suggested solutions
Vertical lines	If black vertical streaks appear on the page:
	• The drum inside the toner cartridge has probably been
	scratched. Remove the toner cartridge and install a new one.
	See “Replacing the Toner Cartridge” on page 7.8.
	If white vertical streaks appear on the page:
	• The surface of the LSU part inside the machine may be dirty.
	Clean the LSU (Clean the LSU. See page 7.4.
Gray background	If the amount of background shading becomes
	unacceptable:
	• Change to a lighter weight pages. See “Paper Specifications”
	on page A.5.
	• Check the machine’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
	“Replacing the Toner Cartridge” on page 7.8.
Toner smear	• Clean the inside of the machine. See page 7.3.
	• Check the paper type and quality. See “Paper Specifications”
	on page A.5.
	• Remove the toner cartridge and install a new one. See
	“Replacing the Toner Cartridge” on page 7.8.

Vertical repetitive		If marks repeatedly appear on the printed side of the page
	defects	at even intervals:
		• The toner cartridge may be damaged. If a repetitive mark
		occurs on the page, print a cleaning sheet several times to
		clean the cartridge; see “Cleaning the Drum” on page 7.9.
		After the printout, if you still have the same problems,
		remove the toner cartridge and install a new one. See
		“Replacing the Toner Cartridge” on page 7.8.
		• 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.

8.14TROUBLESHOOTING