Schematic PCB board inverse

 Research in the PCB reverse, inverse schematic diagram is based on the anti-PCB files directly from the product launch, or the physical picture of PCB schematic to illustrate the principle and circuit board work. Also, this circuit is also used to analyze the functional characteristics of the product itself. In the forward design, product development to conduct a general schematic design, according to the schematic to PCB design.
 Whether it is used in the analysis of circuit board in the reverse principle research and product performance characteristics, or be re-used in the design of the PCB forward basis and foundation design, PCB schematic have a special role. So, according to the documents or the physical map, how to make PCB schematic of the inverse, the inverse process with the attention to those details?
 A rational division of functional areas
 In an intact PCB circuit board schematic reverse design, a reasonable division of functional areas to help engineers reduce unnecessary trouble and improve rendering efficiency. In general, a function of the PCB layout of the same components will focus, in order to function in the counter-push into the region schematic when convenient and accurate basis.
 However, the functional areas of the division is not arbitrary. It requires knowledge of electronics engineers have a certain understanding. First, identify a functional unit of the core components, and then take the cable can be immediately instructed to identify other components of the same functional unit to form a functional area. Partition function is the schematic drawing of the formation of the foundation. In addition, in the process, do not forget to exploit the use of circuit board serial number, they can help you faster functional partition.
 Second, look for pieces of the base
 The base pieces can also be said during the beginning of the schematic drawing with the main components in determining the base pieces, the pieces of the pin according to these benchmarks to draw, to a greater extent, to ensure the accuracy of the schematic.
For engineers, the base piece is not very complicated matter to determine, under normal circumstances, can choose to play a major role in the circuit components as the base pieces, they are generally larger, pins are more easily drawn to, such as integrated circuits, transformers, transistors, etc., can be used as an appropriate benchmark pieces.
Third, the correct distinction between lines, reasonable layout drawing
 For the ground, power lines, signal lines of distinction, also need power engineers have relevant knowledge of the circuit connecting the knowledge, PCB routing knowledge, and so on. These lines of distinction, from the component connections, the line width of copper foil and electronic characteristics of the product itself were analyzed.
Drawing in the wiring in order to avoid crossing the line and interludes, the large scale use of ground grounding symbol, you can use a variety of lines of different colors in different lines to ensure clear and legible, the various components can also use a special symbol, or even separate unit to draw the circuit, and finally the combination.
Fourth, to master the basic framework, drawing on similar schematic
 For some of the basic framework for electronic circuit schematic drawing composition and method, engineers need to master, not only can some simple, classic form of the basic components unit circuit for direct rendering, but also can form the overall framework of electronic circuits.
On the other hand, do not ignore, the same types of electronic products in the schematic has a certain similarity, engineers can experience, take lessons from similar circuit to a new product schematic inverse.
 Fifth, check and optimization
 Schematic drawing is complete, go through testing and verification link to that PCB schematic design of the reverse end. Distribution of PCB components sensitive parameters need to be checked to optimize the nominal value, according to the PCB document map, a comparative analysis of the schematic and check to ensure the schematic diagram of the file exactly the same.
 If the check is found in the schematic layout does not match with the requirements, will also be a schematic of the adjustment until you reach a reasonable and complete specifications, accurate and clear.