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How to reset Brother Toner Cartridge TN-420 TN-450

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.

Please verify the following before attempting a manual reset of the Toner Life Display
• The toner cartridge is not a “starter toner cartridge”

Solution:
The following steps will need to be performed to manually reset the Toner Life Display
1. Open the front cover to the toner/drum section of the printer
2. Press the Clear/Back button and the following message should appear in the LCD display “Replace Drum? 1. Yes 2. No”
3. RESET THE COUNTER IN THE FOLLOWING PROCEDURE BY PRINTER MODEL AND TONER TYPE

MFC models with numeric keypads

  • TN420 standard toner: Press the *, 1 and 1 button in this order
  • TN450 high yield toner: Press the *, 1 and 2 button in this order
  • Unknown Toner Type: Press the *, 0 and 0 button in this order

DPC models without numeric keypads

  • TN420 standard toner: Press the “Start” button, and press “arrow up” or “arrow down”
    button to display “11” on the LCD display. Then press the “OK” button.
  • TN450 high yield toner: Press the “Start” button, and press “arrow up” or “arrow down”
    button to display “12” on the LCD display. Then press the “OK” button.
  • Unknown Toner Type: Press the “Start” button, and press “arrow up” or “arrow down”
    button to display “00” on the LCD display. Then press the “OK” button

The message “Accepted” should be appear on the LCD display.
4. After 2 seconds, “Cover Open” will appear on the LCD display.
5. Close the front cover and the operation is now completed.

HL Series
The following steps will need to be perform to manually reset the Toner error LED
1. Turn off power to the printer
2. Open the front cover to the toner/drum section of the printer
3. Press and hold the “Go” button while turning on power to the printer
4. Release the “Go” button after “Toner, Drum, Error” LEDs turn on with the “Ready”
LED turn off. “All LEDs will now be OFF”
5. Press the “Go” button 2 times – “The Toner, Drum and Error LEDs will turn ON”
6. Press the “Go” button 6 times for a TN420 or Press the “Go” button 7 times for TN450
7. Close the front cover after Error LED starts to flash
8. The reset procedure has been completed

 

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