A fan wheel structure comprises an annular wall, a central shaft extending along a central axis of the annular wall, an annular bottom plate extending outward from a bottom of the annular wall, and plural blades provided on the bottom plate. The crankshaft has an end portion that extends outward beyond the engine body. The electronic device includes a substrate with electronic components coupled to it. In the alternation control, the storage areas is made alternative for each non-volatile memory in which an access error occurs. In one embodiment, the parallel processing system includes an instrument interface parallel controller to control a tray motor driving system, a close-loop heater control and detection system, a magnetic particle transfer system, a reagent release system, a reagent pre-mix pumping system and a wash buffer pumping system. The Intelligent Prefix Dialer is also user programable to dial Caller ID Blocking or Caller ID Sending * codes,, the Intelligent Prefix Dialer intersperses the area code in the correct position before redialing the number, to successfully complete the call.