Brother MFC-9120CN - Manual (Page 127)

Safety and legal
111
A
CAUTION
After you have just used the machine, some internal parts of the machine will be extremely hot.
To prevent injury, when you open the top or back cover (back output tray) of the machine, DO
NOT touch the shaded parts shown in the illustration.
To prevent injuries, be careful not to put your hands on the edge of the machine under the
document cover, the scanner, or the top cover as shown in the illustrations.