Samsung SCX-4200 manual Uneven Density, Background

Troubleshooting

6.1.7 Uneven Density

•Description Print density is uneven between left and right.

	Check and Cause	Solution
1.	The pressure force on the left and right	1. Replace both the left and right bush and
	springs of the transfer roller is not even,	spring assemblies.
	the springs are damaged, the transfer
	roller is improperly installed, or the trans-
	fer roller bushing or holders are damaged.
2.	The life of the Toner cartridge has	2. Replace the toner cartridge and try to print out
	expired.
3.	The toner level is not even on the toner	3. Gently shake the toner cartridge and try
	cartridge roller due to the damaged blade	printing again. If the problem persists
	or low toner.	replace the toner cartridge.

6.1.8 Background

• Description

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Light dark background appears in whole area of the printing.

	Check and Cause	Solution
1.	Printing large quantities of low coverage	1. The toner cartridge is basically designed to
	(2%) pages or the printer has not been	print 3,000 sheets with 5% image. If it
	used for a long time.	prints more than 3,600 sheets with 2%
		coverage, a background can occur.
2.	Is a recycled toner cartridge be	2. The A/S is not guaranteed if using a recy-
	used?	cled toner cartridge.
		Note try shaking the toner cartridge gently
		from side to side. If the problem persists
		replace the toner cartridge.
3.	Has the life span of the toner	3. Replace the toner cartridge when its life is
	cartridge ended?	expired.
4.	Is the movement(Up and Down) of	4. Clean the transfer roller bushes.
	the transfer roller smooth?
5. Is the HVPS normal?		5. Clean the high voltage charge terminals.
		If this does not resolve the problem replace
		the HVPS.

6-4Service Manual

Samsung Electronics