Not only that, he takes the old Q3 and puts it in the transistor checker and finds nothing wrong with it. All I am sure of is that it isn t Q3. He never says, Q3 is the best explanation we can put forward with what we have. He doesn t have to come up with a new diagnosis to reject his previous one. He doesn t waste time trying to prove his previous diagnosis is correct.
Engineers often find out what the problem is by ruling out all the things the problem isn t.
Some scientists, on the other hand, seem to be hamstrung by the philosophy that one can t reject an obviously wrong conclusion until a better conclusion is reached. In the 19 th century, the origin of the many species of life through evolution was plausible. It was believed in those days that life was spontaneously generated. Simple cells were believed to be simple. But 20 th century science has shown that life doesn t begin spontaneously, variations in species are limited by genetics, and simple cells are far more complicated than previously thought.