1. Remove the top cover. (Top Cover)
  2. Remove the N5 cover [A]. 
  3. Remove the fixing plate [A].
  4. Lift the N5 cover [A], slide it to the left, and then remove it by pulling.
  5. Remove the  crease roller cover [A].
  6. Remove the crease sensor bracket [A].
  7. Remove the crease sensor [A].