Optimization of Vehicle PCB Defect Rate Method

- May 15, 2017-

Optimization of Vehicle PCB Defect Rate Method

The following provides a representative part of the professional production of automotive PCB enterprises in the testing process of some special practices available to the majority of PCB colleagues to prepare for reference:

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    1, the second test method

    Part of the PCB production enterprises to adopt the "second test method" to improve the first high-voltage electrical breakdown defect rate.

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    2, bad board foolproof test system

    More and more PCB manufacturers in the light board test machine installed a "good board marking system" and "bad board anti-box" to effectively avoid the loss of man-made. Good board marking system for the test machine to test the PASS board to identify, can effectively prevent the test board or bad board flow to the customer hands. Bad board error box for the test process, test out the PASS board, the test system output box to open the signal; the other hand, test the bad board, the box closed, so that the operator correctly placed the test circuit board.

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    3, the establishment of PPm quality system

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    At present, PPm (Partspermillion, the defect rate of millions of parts) quality system in the PCB manufacturers began to widely used. Among the many customers in our company, Singapore's HitachiChemICal to its application and the results of the most worthy of reference. In the factory there are more than 20 people responsible for the quality of online PCB abnormalities and abnormal quality of the return of the statistical analysis of the work. Using the SPC production process statistical analysis method, each piece of bad board and each piece of defective plate after the classification of statistical analysis, combined with micro-slices and other auxiliary tools to analyze in which production process to produce bad and defective plate. According to the statistical data results, purposefully to solve the problems on the process.

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    4, comparative test method

    Some customers use two different batches of PCB models to compare the test, and track the corresponding batch of PPm situation, so as to understand the performance of the two test machines, and thus select the better performance of the test machine to test the automotive PCB.

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    5, improve the test parameters

    Choose a higher test parameters to strictly detect such PCB.PCBA OEM OEM found that if you choose a higher voltage and threshold, increase the number of high-voltage read leakage, PCB defect can improve the detection rate. For example, a large-scale Taiwan-funded enterprises in Suzhou using 300V, 30M, 20 Europe to test automotive PCB.


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