After replacing new drum for Brother HL-5450dn, HL-5470dw, HL-6180dw and HL-6180dwt laser printer, you will need to reset the drum counter.
It is simple procedure, first keep the front cover open, then:
For the models with LCD
Hold down Go until the Drum Clear message is displayed on LCD, then release Go
For the models without LCD
Press and hold down Go for about 4 seconds until all the LEDs light up
Once all six LEDs are lit, release Go
Now, close the front cover and the printer will initialize, you will now be able to print.
