In The Duplex Unit Area - Xerox Phaser 3300MFP User Manual

6 Unfold the duplex guide fully.
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7 While pushing the fuser lever to the right, open the fuser door.
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1 duplex guide
2
1
fuser lever
2 fuser door
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 loosen the paper, and then remove it.
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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 jams may occur. Make sure
that the duplex unit is inserted correctly.
Duplex Jam 0
1 Pull the duplex unit out of the machine.
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14.5
<Troubleshooting>
1 pressure lever
1 duplex unit