Brother HL-3400CN Series - Manual (Page 206)

CHAPTER 5 MAINTENANCE
5-49
6. With all the covers and units open, remove the jammed paper. Access and remove
the jammed paper from inside the Rear Access Cover.
Fig.5-64 Remove the Jammed Paper
7. Set the Pressure Release Levers of the Fusing Unit to the SET position and close
the Top Cover.
Fig.5-65 Set the Levers
8. Close the Duplex Cover Top Assembly.
9. Close the Rear Access Cover of the printer.
10. Close the Inside Unit and the Duplex Lower Cover of the Duplex Unit.