Abstract: An apparatus includes circuitry to receive an input of problem information that is information on a problem, transmit the problem information to an information processing apparatus communicably connected to the apparatus via a network, and receive, from the information processing apparatus, troubleshooting information corresponding to the problem information. The troubleshooting information is information for solving the problem. The circuitry outputs the troubleshooting information, and transmits, to an extraneous resource, a repair request including the problem information and information indicating whether the troubleshooting information has been output.

Abstract: A number of vanes 12 are disposed in a peripheral direction of a plurality of supporting disks disposed along a rotary shaft 14 at given intervals. Each vane 12 is disposed at an angular interval as determined by a logistic representation. Thereby the intensity and variations of noise levels at around 8N on the low-frequency side, as well as the noise level caused by rotary first-order sounds, can be reduced.