In the duplex unit area

9.4   
<Troubleshooting>
5
Release the blue strap, the rear cover stopper, and fully open the 
rear cover, as shown. 
6
Unfold the duplex guide fully.
7
While pushing the fuser lever to the right, open the fuser door.
1
rear cover stopper
2
rear cover
2
1
1
duplex guide
1
1
fuser lever
2
fuser door
2
1
8
Pull the jammed paper out.
If the jammed paper does not move when you pull, push the pressure 
lever on each side up to loose the paper, and then remove it.
9
Return the lever, door, stopper, and guide to their original position.
10 Close the rear cover. Printing automatically resumes.
In the duplex unit area 
If the duplex unit is not inserted correctly, paper jam may occur. Make 
sure that the duplex unit is inserted correctly.
Duplex jam 0
1
Pull the duplex unit out of the printer.
1
pressure lever
1
1
duplex unit
1