Brother HL-L8350CDWT - Manual (Page 141)

Routine Maintenance
134
5
k Push the drum unit in until it stops.
l
Close the front cover of the machine.
Resetting the drum counter
5
When you replace a drum unit with a new one, you must reset the drum counter by completing the following
steps:
a Press a while holding down Go on the machine's control panel to display Reset Menu.
b Press a or b ( + or -) to display Drum Unit. Press OK.
c
Press a for Reset to reset the drum counter.