Brother  HL-4140CN User Manual page 76

j
Turn the green lock lever (1) clockwise
to the lock position.
k
Push the drum unit in until it stops.
l
Close the front cover of the machine.
1
Routine maintenance
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:
a
Press Menu, 5, 8.
b
Press a or b to choose Drum. Press OK.
c
Press 1 to reset the drum unit counter.
d
Press Stop/Exit.
A
A
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