Brother HL-8050N - Manual (Page 51)

2 - 18 USABLE PAPER TYPES AND PRINTING METHOD
6
Load the envelopes with the side to be printed facing up
and with all 4 corners aligned.
■
Do not load envelopes exceeding the maximum
capacity allowed.
■
Align the right width guide with the envelope width
correctly. If the right width guide is not in place, the
envelope will not be properly fed and may cause a
paper jam.
■
The flap must be placed face down with the flap on the
right side edge.
7
Replace the lid of the paper tray.
The lid of the tray must be firmly seated. If not, the paper
might be misaligned.
8
Push the paper tray completely into the printer.