1. Open the rear cover (a).
  2. Pull the conveying stopper (a) toward the machine right side and rotate it by using a flat-blade screwdriver (b).
  3. Release the hook (c) of the conveying stopper (a) from the rib (d) and pull the conveying stopper (a) out.
  4. Slide the duplex paper conveying unit (a) toward the machine right side.
  5. Release the fulcrum part of the duplex paper conveying unit (a) at the machine left side, and pull the unit out toward the machine rear side.