An embodiment of the present invention relates to a method for detection of short circuit conditions in an LED array having one or more LED strings, each of which includes one or more LED devices. An air ejector is provided in a negative pressure pipe, to which communication passages for the respective cylinders are converged. In this market structure, a plurality of business entities have access to the insurance market place, and they place details of insurance goods andor services to be sold on-line. When it is determined that the received data has not been archived yet, image outputting of the received data is inhibited. More specifically, in the method and apparatus, a determination as to whether input data should be modulated is made in accordance with the compared results of the mostleast significant bit data with the first and second reference values. The circuit board includes conduction paths for connection between the crystal and a terminal pad.