A stepping exerciser includes a base having a seat, a follower rotatably attached to the base and having an axle and a shaft, two foot supports rotatably attached to the follower with the axle and rotatable up and down relative to the base, and rotatable relative to the base together with the follower. An encoder offset SH_L_EDG for the left mark edge BMa is set based on the difference between the carriage position that is detected when the print head 10 prints the left mark edge BMa and the carriage position that is detected when the media sensor 68 detects the left mark edge BMa. The apertures are covered by louvers that extend above the edges of the apertures to prevent solid particles from spilling through inlet apertures. The sensor outputs sensor color values representing the light received from the color chart printout.