Introduction to PCB component layout inspection rules

PCB layout process, after the layout of the system, to review the PCB diagram to see whether the layout of the system is reasonable, whether it can achieve optimal results. Usually can be examined from a number of aspects, as follows.
1. Whether the system layout ensures that the wiring is reasonable or optimal, whether the wiring can be carried out reliably, and whether the reliability of the circuit work can be guaranteed. The layout requires an overall understanding and planning of the signal path as well as the power and ground networks.
2. Whether the size of the printed board and processing drawings match the size, can meet the PCB manufacturing process requirements, with or without behavior markers. This point requires special attention, many PCB board circuit layout and wiring are beautifully designed and reasonable, but neglected to locate the precise positioning of the connector, resulting in the design of the circuit can not be docked with other circuits.
3. components in two-dimensional, three-dimensional space there is no conflict. Pay attention to the actual size of the device, especially the height of the device. In the welding-free layout of the components, the height generally can not exceed 3mm.
4. Whether the component layout is sparse and orderly, neatly arranged, and whether all cloth. In the layout of components, not only to consider the direction of the signal and the type of signal, the need for attention or protection, but also to consider the overall density of the layout of the device, so that sparse and even.
5. Whether the components that need to be replaced frequently can be replaced easily and whether the plug-in board is easy to insert into the device. Should ensure that the replacement of frequently replaced components and plug-in convenient and reliable.
6. Adjustment of adjustable components is convenient.
7. Whether there is a proper distance between the heat-sensitive components and the heat-generating components.
8. Whether there is a heat sink or fan in the place where heat dissipation is required, and whether the air flow is smooth. Attention should be paid to the heat dissipation of components and circuit boards.
9. Whether the signal direction is smooth and the shortest interconnection.
10. Whether the plugs, sockets, etc. contradict the mechanical design.
11. Whether the interference problem of the line is considered.
12. Whether the mechanical strength and performance of the circuit board is considered.
13. The art of circuit board layout and its aesthetics.
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