Brother HL-J6000DW Online User's Manual page 259

If your LCD error message was repeat paper jam messages, for example [Repeat Jam Front/Rear],
do the following:
a. Lift the Jam Clear Flap, and remove the jammed paper.
b. Make sure you look carefully inside (1) for any scraps of paper.
When finished, continue with the next step.
5. Using both hands, use the finger holds on each side of the machine to lift the top cover (1) into the open
position.
6. Slowly pull the jammed paper (1) out of the machine.
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