Brother HL 4150CDN - Manual (Page 114)

Routine Maintenance
108
5
h
Turn the green lock lever (1) clockwise to the lock position.
i Push the drum unit in until it stops.
j
Close the front cover of the machine.
When you replace the belt unit with a new one, you need to reset the belt unit counter by completing the
following steps:
a Press + or - to choose Machine Info.. Press OK.
b Press + or - to choose Reset Parts Life. Press OK.
c
Press + or - to choose Belt Unit. Press OK.
d Press + to reset the belt unit counter.
1