On Brother MFC-9970CDW multi-functional machine, to reset the “Replace Toner” Message for Black Cartridge as following:
- Open the front cover
- Press “1” on the keypad
- Select K.TNR-HC on the touch screen
- Select “yes” to reset
- Press return to go back to the main menu
- Close the front cover
Then, the machine will go through the initialization process, then back to Ready status.