(1) clear purpose, make things simple. To read electronic schematics, we must first understand the purpose of this circuit, and then look at what is it electrical components. According to these components the whole circuit is divided into several parts, using block diagram form, relationships between the circuit and the circuit. This rough analysis can block diagram of electronic circuits.
(2) identify source fault and load-side. It means to find the circuit at both ends, to analyze the input and output signals of the circuit. For example, judge circuit is driven loudspeaker, picture tube, push for indicating instruments or promoting other load. In addition, also find power and polarity of the power supply, power supply voltages, sizes and sources.
(3) mainly to transistors. This refers to the transistor, integrated circuit–centric, role of analyzing each transistor in the circuit, consists of the basic circuits. Analysis of circuit, to step by step analysis of signal transduction and transformation process.
(4) analysis of the potential. Analysis of transistor potentials, the pins of the IC–potential and the potential of each node, you must identify a baseline for reference potential. Usually based on “common ground (neutral)“ as a benchmark. If there is no reference point, it cannot be the points in the circuit to compare the potential, can’t figure out the circuit points of potential change in trend.