By D.J. Garland and F.W. Stainer (Auth.)
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Sample text
There is no need, for instance, for the voltage at every point in a unit to be specified when one or two voltages would permit fault location to a single component.
G. an open circuit wire detected by X-rays. A more commonly encountered non sequential method is theoretical analysis. Here an attempt is made to deduce, from first principles, the component or components and type of failure which could cause the detected symptoms. For example, with a circuit which produces a sine wave output, it might be possible to note a par ticular distortion in the waveform and attribute this to a certain component failure in the circuit. This is an impressive and sometimes effective technique, but it is also a difficult one which is more suited to the designer than the technician.
This type of fault can be avoided by a design which only provides test points and other maintenance facilities at points where circuits can be isolated. As with the type of fault discussed in (b) above, the condition is easily re cognized and can be overcome by changing to another systematic method of elimination. d. The fault is catastrophic. This is an extension of (c) to the stage where the equipment becomes completely inoperative because a component fails, for example when the fuses always blow on switching on.