Canon i-SENSYS MF729Cx Important Safety Instructions And Installation Manual page 595

2
Gently pull out the paper.
When the optional paper drawer (drawer 2) is attached, gently pull out the paper in the same way.
3
Set the paper drawer.
4
When the screen shown below is displayed, tap <Yes>.
Paper Jams in the Back Side
1
Open the rear cover.
2
Pull down the green knob toward you, and gently pull out the paper.
3
Gently pull out the paper.
4
Hold the green knobs, and firmly close the duplex unit ( ) until it clicks.