Samsung SCX3405FWXAC 사용자 설명서

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Estimated cartridge life (the life of the toner cartridge yield) depends on the 

amount of toner that print jobs require. The actual print yield may vary 

depending on the print density of the pages you print on, operating 

environment, percentage of image area, printing interval, media type and/or 

media size. For example, if you print a lot of graphics, the consumption of the 

toner is higher and you may need to change the cartridge more often.