Brother HL-8050N - Manual (Page 169)

A - 11 APPENDIXES
8
Pull the paper trays out of the printer.
9
Lift up the printer by holding the recessed areas as shown
in the illustration.
10
Align the corners of the printer and the lower trays, and
lower the printer gently so that the guide pins at the 4
corners of the lower trays fit into the holes at the base
plate of the printer.
The printer must be lowered gently.
Otherwise, the interior parts may be damaged.
11
Insert the fasteners provided into the 2 locations inside the
printer and 2 locations at the back of the printer.
Insert the fasteners securely.