Brother MFC-J815DW Online User's Manual page 43

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5. Close the output paper tray cover.
6. Load up to 20 sheets of photo paper with the printing surface face down.
Loading more than 20 sheets of photo paper may cause paper jams.
7. Gently adjust the paper width guides (1) to fit the paper.
Make sure the paper width guides touch the edges of the paper and the paper is flat in the tray.
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8. Slowly push the paper tray completely into the machine.
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