Brother DCP-8110DN Basic User's Manual page 61

Note
Make sure that you put in the toner
cartridge correctly or it may separate from
the drum unit.
g
Put the drum unit and toner cartridge
assembly back into the machine.
Do not close the front cover of the
machine.
Resetting the drum counter
When you replace a drum unit with a new
one, you need to reset the drum counter by
completing the following steps:
Important
Do not reset the drum counter when you
only replace the toner cartridge.
a
With the front cover still open, press
Clear.
Replace Drum?
a 1.Yes
2.No
b
Select ab or OK
b
To confirm you are installing a new
drum, press 1.
c
When the LCD shows Accepted, close
the front cover of the machine.
A
Routine maintenance
51
A