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Install a genuine Samsung Black Toner Cartridge to ensure the very highest reliability and quality from your Samsung ML-1640 or ML-2240 laser printer. The toner LED on your printer will start blinking when the current toner cartridge is running low. Order a replacement and replace it as soon as you see a rapidly blinking or solid red light. This standard yield toner cartridge is packed with toner to print 1500 pages.