Brother HL-6180DW
Printer keeps showing 'Replace Toner' message after installing the Cartridge - Brother TN-3330/3380/3390
Reset process
1) Switch-off the printer
2) Open the front cover
3) Press and Hold the Go button until all the LEDs on the printer control panel light-on
4) Release the Go button
5) Press Go twice
6) Press Go 6 times if you want to reset TN-3330
7) Press Go 7 times if you want to reset TN-3380
8) Press Go 8 times if you want to reset TN-3390
9) Close the front cover. Now the printer is ready for printing.