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Board proofing detection common sense

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1. When there is no isolation transformer, it is strictly forbidden to use grounded test equipment to detect PCB board.
Even if the general equipment is equipped with a power transformer, it is necessary to first understand the chassis of the machine to be tested. Otherwise, it is very easy to have a short circuit of the power supply. Once the integrated circuit is affected, it will have a further impact, and the consequences are unimaginable. Not just the economic aspect.

2. Before testing the PCB board, you should first understand the working principle of the integrated circuit and its related circuits.
Before checking the integrated circuit, you must first familiarize yourself with the function of the integrated circuit used, the operating parameters of its own parameters and the circuit composed of the peripheral components, and then carry out the repair with ideas, then optimize the analysis and inspection process.

3. Pay attention to the insulation performance of the soldering iron before detecting the PCB board.
It is strictly forbidden to use a soldering iron with a soldering iron. Before using it, make sure that the soldering iron is not charged. According to the basic knowledge, ground the soldering iron shell and use a low-voltage soldering iron (less than 8V).

4. Carefully check whether the PCB file information is correct.
Even a senior PCB engineer will inevitably have the possibility of error. Before the proofing, the document should be strictly reviewed according to experience, to avoid unpredictable mistakes in the subsequent proofing process, which will reduce the efficiency of production. And increased the cost of proofing.

5. To have a rigorous attitude towards the layout and routing of components.
The layout and aliasing of components will have a certain impact on the quality of the product. Attention should be paid to the order of arrangement of the components, the assembly of the components in accordance with the skilled operation, and the problem of ensuring heat dissipation at the time of layout, and not arranging the heat-generating components in a concentrated manner, and the distance between the reasonable treatments.

6. Make certain adjustments to the wiring of the PCB.
It is necessary to make certain adjustments to the individual components, and to process the text on the board for subsequent production and debugging. In case there is a problem, it is also convenient for later maintenance.

7. Use the software for simulation test before board proofing.
Because of the advancement of technology, we can now carry out simulation test on the software first. During the operation, the problem can be found in advance and preprocessed, which can greatly reduce the workload of later detection, debugging and maintenance.

8. To ensure the quality of PCB board welding.
When welding, it is necessary to control the welding time and its power, and do not have low-level errors and improve efficiency. Short circuit detection is required after soldering.

9. Consider the number of board proofing.
Calculate and determine the number of proofs according to the specific situation, and reduce unnecessary cost losses to a certain extent. After communicating with the customer in advance, determine the board that needs to be produced to prevent customer error consumption.

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