The reset gear on the toner cartridge did not properly contact and reset the New Toner Sensor within the printer. The reset gear will operate only once after the toner cartridge is installed and the position of the gear cannot be reset after installation. To reset the Toner Life Display, a manual reset procedure must be performed.  

HL-L8260CDW

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• Open the front cover of the printer (to access cartridges). 
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• With the front cover open, simultaneously press the Secure and Cancel buttons. 
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• The reset menu will now appear on the LCD display. 
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• Scroll through the menu to select a color and yield to reset. 
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• The LCD will read "Accepted" once the reset is complete. 

DCP-L8410CDW, HL-L8360CDW, HL-L8360CDWT, HL-L9310CDW, MFC-L8610CDW, MFC-L8690CDW, MFC-L8900CDW, MFC-L9570CDW

• If an error message is currently on the LCD display, press the Cancel (X) button to show the main menu. 
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• Open the front cover of the printer (to access cartridges). 
• Press the "Back " and "Cancel" buttons at the same time, and hold for 1 to 2 second, when you released 2 buttons, press the "Back " button again at once. The printer will go to the reset page
• The reset menu will now appear on the LCD display. 
•     
• Scroll through the menu to select a color and yield to reset. 
•     
• The LCD will read "Accepted" once the reset is complete.