Brother HL-3170CDW - Manual (Page 171)

Troubleshooting
165
5
Paper is jammed underneath the Paper Tray
5
If the LCD shows Jam 2-sided, follow these steps:
a Leave the machine turned on for 10 minutes for the internal fan to cool the extremely hot parts inside the
machine.
b Pull the paper tray completely out of the machine.
c
Make sure that the jammed paper does not remain inside the machine.
d If paper is not caught inside the machine, check underneath the paper tray.