Samsung SCX-8128NA-XAA - Manual (Page 138)

Troubleshooting_ 138
Paper jam in tray 3, 4
Click this link to open an animation about clearing a jam.
1. Open the right bottom door of the dual cassette feeder.
2. Remove the jammed paper by gently pulling it straight out.
Close the dual cassette feeder right bottom door.
If you do not see paper in this area, go to the next step.
3. Pull out tray 3 or 4.
4. Remove the jammed paper from the machine.
5. Insert tray 3 or 4 back into the machine until it locks into place. Printing
automatically resumes.