Brother MFC-J4340DW Online User's Manual page 478

If your LCD error message was [Repeat Jam Front], do the following:
a. Make sure you look carefully inside (1) for any scraps of paper.
b. (MFC-J4340DW/MFC-J4440DW) Squeeze both levers (1), and then open the Jam Clear Cover at the
back of the machine.
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(MFC-J4540DW) Open the Jam Clear Cover (1) on the back of the machine.
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c. Slowly pull the jammed paper out of the machine.
d. Close the Jam Clear Cover. Make sure the cover is closed completely.
5. Put the paper support firmly back in the machine. Make sure you fit the paper support into the channels.
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