Brother MFC-J491DW Online User's Manual page 45

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IMPORTANT
If envelopes are "double-feeding," load one envelope in the paper tray at a time.
5. Close the output paper tray cover.
6. Slowly push the paper tray completely into the machine.
7. Pull out the paper support (1) until it locks into place, and then unfold the paper support flap (2).
Related Information
• Load Paper in the Paper Tray
• About Envelopes
• Change the Check Paper Size Setting
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