Brother MFC-L8600CDW - Manual (Page 76)

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i
Push the drum unit in until it stops.
j
Close the front cover of the machine.
k
Turn on the machine’s power switch.
Cleaning the corona wires
A
If you have print quality problems or the
Touchscreen displays Drum !, clean the
corona wires as follows:
a
Make sure that the machine is turned
on.
b
Press the front cover release button and
pull open the front cover.