Chapter 8

Road Maps and Street Signs: Diagrams

Today’s products can contain hundreds or even thousands of components. Even after you’ve considered a unit’s failure history and pondered a preliminary diagnosis, there can still be lots to examine and test. How the heck do you find your way around what looks like a city on Mars?

There are three types of road maps to help you navigate the innards of an electronic device:

• Block diagram. This lays out the device by the function of each section and its basic interconnections. It does not show individual components or specific connection points. It’s the most general, conceptual view, analogous to a map showing cities and route numbers for major highways between them, but not street-level detail ( ...

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