Brother HL-3400CN Series - Manual (Page 205)

USER’S GUIDE
5-48
3. Open the Rear Access Cover of the printer.
Fig.5-61 Open the Rear Access Cover
4. Open the Duplex Cover Top Assembly.
Fig.5-62 Open the Duplex Cover Top Assembly
5. Open the Top Cover of the printer and set the Pressure Release Levers of the Fusing
Unit to the OPEN position.
Fig. 5-63 Release the Levers