Brother MFC 9840CDW - Manual (Page 172)

156
e
Wipe the scanner windows (1) with a
dry, lint-free cloth.
f
Put the drum unit back in the machine as
follows.
1
Make sure that the gray lock
lever (1) is in the up position and
put the drum unit in the machine.
Push down the gray lock lever (1).
1
1
1