Samsung SCX-8240NA-CAS - Manual (Page 233)

Troubleshooting_ 233
Paper jam after 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. Turn the fold wheel in the direction of the arrow until you can remove the
jammed paper.