Samsung SCX-8240NA-CAS - Manual (Page 229)

Troubleshooting_ 229
3. Remove the jammed paper by gently pulling it out.
4. Close the finisher front door.
If this paper jam persists, make sure the bridge covers are inserted
correctly. When the bridge covers are not inserted correctly, it could
cause paper jams and hole punch positions askew.
Paper jam inside of booklet maker (3,250-sheet
booklet finisher only)
Click this link to open an animation about clearing a jam.
1. Open the finisher front door.
2. Pull out the booklet maker.