Samsung SCX-8128NA-XAA - Manual (Page 144)

Troubleshooting_ 144
Paper jam inside of finisher
Click this link to open an animation about clearing a jam.
1. Lift up the finisher top cover.
2. Let the jammed paper move out by rotating the paper roller gear.
3. Gently pull the jammed paper out. Close the top cover
4. Open and close the finisher front door. Printing automatically resumes.