Brother HL-5150D - Manual (Page 38)

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Put envelopes in the MP tray so that they touch the back of the tray and remain under the maximum
paper height guides on both sides of the tray. Do not put more than 3 envelopes in the MP tray at
any one time, or it may cause a jam.
Figure 1-38
Envelopes that have been creased after they have been printed:
At the back of the printer, open the face-up output tray and push down the blue tabs at the left and
right hand sides (as shown in the figure below). When you have finished printing your envelopes,
close the face-up output tray to reset the two blue tabs back to their original position.
Figure 1-37
Make sure that the envelopes are neatly stacked and in the proper position in the MP tray. If they
are not, the envelopes may not be fed properly, resulting in a skewed printout or a jam.