Brother MFC 9840CDW - Manual (Page 170)

154
Cleaning the laser scanner
windows
C
CAUTION
DO NOT use isopropyl alcohol to clean the
laser scanner windows.
DO NOT touch the laser scanner windows
with your fingers.
a
Turn off the machine’s power switch.
Unplug the telephone line cord first,
disconnect all cables, and then unplug
the power cord from the AC power
outlet.
b
Press the front cover release button and
then open the front cover.
c
Hold the green handle of the drum unit.
Lift the drum unit up and then pull it out
until it stops.