chapter  39
Test equipment and fault-fi nding
Pages 15

A good general knowledge of electricity/electronics is essential because not all equipment is well documented, and in some cases only a circuit diagram (or even nothing at all) may be available as a guide. Failing a concise description of how the equipment works, you may have to work out for yourself the progress of a signal through the equipment. In addition, a wide general knowledge is needed if you are to make reasonable assumptions about how to substitute components. You are not likely to know why something does not work if you do not know what does make it work.