This specification discloses an improved method for conducting the removal of C5 xylan based sugars from biomass. A moving mechanism C1 is driven to move a printing head 41 toward a platen and to urge the printing head against paper, and gap adjusting means C2 is driven using said position as a reference to space the printing head from the platen a predetermined amount, thereby adjusting a gap between the printing head and the platen. The transmitter may receive a notification that indicates information transmitted via the voice channel will be replaced by control information.