In the PCB reverse technology research, the anti-push schematic diagram is based on the PCB file diagram or launched directly according to the product physical mapping PCB circuit diagram, designed to explain the principle of PCB board and work. Also, this circuit diagram is used to analyze the functional characteristics of the product itself. In the forward design, the general product research and development to be the first schematic design, and then according to the schematic diagram for PCB design.

PCB schematic has a special role, whether it is used as a basis for analyzing circuit board principles and product work characteristics in reverse research, or as a basis for PCB design in forward design. So, according to the document map or in kind, how to carry out PCB schematic diagram of the anti-push, reverse the process of the attention to those details?

First, a reasonable division of functional areas

In the reverse design of a schematic PCB circuit board, a reasonable division of the functional area can help engineers to reduce some unnecessary trouble and improve the efficiency of drawing. In general, a PCB board on the same function of the components will be concentrated to function to divide the area can be in the back of the schematic diagram when there is a convenient and accurate basis.
However, the division of this functional area is not arbitrary. It requires engineers to have some knowledge of electronic circuit-related knowledge. First of all, to find a functional unit of the core components, and then according to the connection can be traced to find out the same functional unit of other components, the formation of a functional partition. The formation of functional zoning is the basis of schematic drawing. Also, in this process, do not forget to use the components on the circuit board cleverly, they can help you to more functional partition.

Second, find the reference parts

This reference element can also be said to be the main part of the drawing at the beginning of the drawing of the PCB, after the determination of the reference parts, according to the pins of these benchmarks to draw, to a greater extent to ensure the accuracy of the schematic Sex.
For engineers, the reference parts to determine is not very complicated things, under normal circumstances, you can choose to play a major role in the circuit as a reference device components, they are generally larger, more pins, easy to draw the progress, Such as integrated circuits, transformers, transistors, etc., can be used as a suitable reference.

Third, the correct distinction between lines, reasonable drawing wiring

For the ground, power lines, signal line distinction, the same engineers need to have the relevant power knowledge, circuit connection knowledge, PCB wiring knowledge and so on. The distinction between these lines can be analyzed from the aspects of component connection, line copper foil width, and the characteristics of the electronic product itself.
In the wiring drawing, in order to avoid the line cross and interspersed, the ground can use a large number of grounding symbols, a variety of lines can use different colors to ensure a clear line of different lines, a variety of components can also use special signs, The unit circuit separately drawn, and finally combined.

Fourth, master the basic framework, drawing similar schematics

For some basic electronic circuit frame composition and schematic drawing method, engineers need to master, not only to some simple, classic unit circuit of the basic form of direct drawing, but also to form the overall framework of electronic circuits.
On the other hand, do not ignore the same type of electronic products in the schematic diagram has a certain similarity PCB network city, engineers can be based on the accumulation of experience, fully learn from the same circuit diagram to reverse the new product schematic.

Fifth, check and optimize

After the schematic drawing is completed, it is also tested and checked to say that the reverse design of the PCB schematic ends. The nominal value of the components sensitive to the PCB distribution parameters need to be checked and optimized. According to the PCB drawing, the schematic diagram is compared and checked to ensure that the schematic and the file map are exactly the same.
If the layout is found in the checklist and the requirements do not match, but also to adjust the schematic, until it is completely reasonable and standardized, accurate and clear.