Disclosed is an exhaust valve capable of correctly openingshutting an exhaust port of a cylinder based upon variation of the flux density of an electromagnet. Each of a plurality of software images includes a plurality of memory blocks with corresponding image addresses within the software image. However, if the motor is driven in a reverse direction, the orbit rate of the orbiting scroll is reduced. The receiver can have a conventional optical detector for determining a two-dimensional position of the receiver relative to a detected light, or can have a three-dimensional spot collimating lens and charged couple device optical detector for determining a three-dimensional position of the receiver relative to a detected light. Said components can be implemented to detect, on a continuous basis, solder interconnect fractures as they occur during actual end-use, throughout the lifecycle of monitored components, rather than relying on a one-time electrical check prior to shipment.