The six major methods to reduce the vehicle PCB defect rate

The six major methods to reduce the vehicle PCB defect rate

The automotive electronics market is the third largest application area for computers after communication. With the traditional mechanical products from the traditional sense of the gradual evolution of the development of intelligent, information technology, mechanical and electrical integration of high-tech products, electronic technology in the automotive application has been very broad, whether it is the engine system, or chassis system, Security systems, information systems, automotive environment systems, without exception, the use of electronic products. The car market has clearly become another bright spot in the consumer electronics market, the development of automotive electronics, naturally led the development of automotive PCB.

In today’s PCB application of key objects, automotive PCB to occupy an important position. But because of the special working environment of the car, safety and high current requirements such as the characteristics of its PCB reliability, environmental adaptability and other requirements are higher, involving a wide range of PCB technology, which for PCB enterprises, is a Challenge; and for those who want to open up the automotive PCB market, the need for the new market to do more understanding and analysis.

Automotive PCs emphasize high reliability and low DPPM, are our companies in the high reliability of manufacturing with the accumulation of technology and experience? Is it consistent with the future direction of product development? In the process control, whether it is good In accordance with the requirements of TS16949 do? Has made a low DPPM? These have to do a careful assessment of the light to see this tempting cake and blindly enter, will bring harm to the enterprise itself.

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:

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.

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.

3, the establishment of PPm quality system

At present, PPm (Partspermillion, 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.

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.

5, improve the test parameters

Select higher test parameters to strictly detect such PCB. Because, 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.

6, regularly check the test machine parameters

Test machine in the long-term operation, the internal resistance and other related test parameters will be biased. And therefore need to regularly adjust the machine parameters to ensure the accuracy of test parameters. Test equipment in a considerable part of the large PCB enterprises are six months or a year of machine maintenance, adjust the internal performance parameters. The pursuit of “zero defect” automotive PCB has been the direction for the majority of PCB people, but by the process equipment, raw materials and many other restrictions, so far PCB industry, the world’s top 100 companies continue to explore ways to reduce PPm.

Grace Zheng

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