Samsung SCX-8240NA-CAS - Manual (Page 231)

Troubleshooting_ 231
Paper jam before booklet folding (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.
3. Turn the knife wheel several times in the direction of the arrow.
4. Open the booklet maker cover.