Brother Copier/Printer MFC-9970CDW - Manual (Page 106)

90
g
Put the new belt unit back in the
machine. Make sure the belt unit is level
and fits firmly into place.
h
Make sure the green lock lever (1) is in
the release position as shown in the
illustration.
i
Match the guide ends (2) of the drum
unit to the c marks (1) on both sides of
the machine, then gently slide the drum
unit into the machine until it stops at the
green lock lever.
1
1
2