A method for improving fault isolation for failure modes in complex systems, and a software program embodying the method or a corresponding method together with a computer based aircraft diagnostic system using such software is described. Thus, even when a ripple component by a switching operation of the converter has been superimposed on a drive voltage Va, constantly the same gate-to-source voltage Vgs is supplied to a light emission drive transistor Tr2 for each scan line, whereby a problem that a state in which light emission intensities differ for each scan line is brought about can be resolved. The method can also include adding the adobe mixture to the mold, and pressing the adobe mixture in the mold and heating the mold in a series of production stages to form a molded adobe tableware product. Commands are input into the user’s telephone to provide an indication of the amount of parking time required and payment for the parking time and information is downloaded from the station to the parking meter to indicate that parking has been paid for and the parking meter should activate to indicate that parking has been paid for. The at least one first electrode is arranged in an intermediate portion with respect to the interface such that the intermediate portion of the interface is moved substantially in direction of the optical axis in dependence on the voltage applied between the at least one first electrode and the at least one second electrode. A next print job is started using either one of the two thermal printheads depending on which one was determined to be nearer the receiving media.