PCBA assembly precautions

During the PCB assembly process,  PCB assembly china reminds to pay attention to the following matters:

Before installing components, layout and position them according to the circuit schematic. Install components manually or automatically, taking care to avoid excessive bending, squeezing, or twisting of the PCB board to reduce stress concentration.

2. In PCB through-hole design, avoid using blind holes and buried holes.

3. Ensure that the silk screen is clear and recognizable, making it easy to assemble. The silk screen markings include information such as component placement position, component stop, reference indicator, component polarity, test points, version, etc.

4. Identify the polarity of components, especially on components such as electrolytic capacitors, LEDs, diodes, and ICs. Identify the cathode and anode, as well as pin numbers, to prevent errors during assembly.

5. Isolate lead and lead-free components to ensure welding quality and compliance.

6. Pay attention to the spacing between components to avoid mutual interference between them during the assembly process.

When designing double-sided boards, pay attention to the components of the metal casing. For example, during DIP, the casing comes into contact with the PCB, and the top solder pad cannot be opened. It must be coated with solder mask oil or silk screen oil.

8. During the layout process, distribute large components evenly on the PCB board as much as possible to achieve better heat distribution during reflow soldering.

After completing the wiring, make some adjustments to the text, individual components, and wiring, as well as apply copper to ensure that the entire ground wire is connected.

10. During the PCB assembly process, attention should also be paid to checking and verifying to avoid inconsistencies between the circuit schematic and the actual circuit relationship

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