[Industry News] Remember These Six Points, and Say Goodbye to The Defects of Automobile PCB!

Automobile electronic market is the third application field of PCB after computer and communication. With the development of automobile from traditional mechanical products to intelligent, information and Mechatronic high-tech products, electronic technology has been widely used in automobile, no matter in engine system, chassis system, safety system, information system, interior environment system, etc. The automobile market has obviously become another bright spot of the electronic consumer market. The development of automobile electronics naturally drives the development of automobile PCB.

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In today's PCB key application objects, Automotive PCB occupies an important position. However, due to the special working environment, safety and high current requirements of the automobile, it requires high reliability and environmental adaptability of PCB, and involves a wide range of PCB technology types, which is a challenge for PCB board manufacturer and PCB assembly supplier; for manufacturers who want to explore the Automotive PCB market, they need to do more understanding and analysis of the new market.

PCB for automobile especially emphasizes high reliability and low DPPM, so does our enterprise have technology and experience in high reliability manufacturing? Is it consistent with the product development direction in the future? In the process control, can we do well in accordance with the requirements of TS16949? Has a low DPPM been achieved? All of these should be carefully evaluated. Just seeing this attractive cake and entering blindly will bring harm to the enterprise itself.

The following provides some typical special practices of some professional PCB board manufacturers in the test process for the reference of PCB colleagues:

The second test method is adopted by some PCB board manufacturers to improve the rate of finding out the first high voltage breakdown defect.

More and more PCB board manufacturers install "good board marking system" and "bad board error proof box" in the light board tester to effectively avoid human leakage. The good board marking system marks the tested pass board for the tester, which can effectively prevent the tested board or the bad board from flowing into the customer's hands. In the test process, when pass board is tested, the test system outputs the signal that the box is open; otherwise, when the bad board is tested, the box is closed, so that the operator can correctly place the tested circuit board.

3. The establishment of PPM quality system at present ppm quality system has been widely used in PCB board manufacturer. Among many of our customers, Hitachi chemical in Singapore is the most valuable one to learn from. In the factory, there are more than 20 people who are specially responsible for the statistical analysis of online PCB quality abnormality and PCB quality abnormality return. By using SPC production process statistical analysis method, every broken board and every returned defective board are classified and analyzed, and combined with micro slice and other auxiliary tools to analyze which manufacturing process produces the broken and defective board. According to the statistical data results, purposefully solve the problems in the process.

4. Comparative test method: some customers use two different brands of PCBs in different batches for comparative test, and track the ppm of corresponding batches, so as to understand the performance of the two testing machines, so as to select better performance testing machines to test automotive PCBs.

Improve the test parameters and select higher test parameters to strictly detect such PCB. Because, if we choose higher voltage and threshold, increase the leakage times of high voltage reading, we can improve the detection rate of PCB defect board. For example, a large Taiwan funded PCB factory in Suzhou uses 300V, 30m and 20 euro to test PCB for automobile

 6. After the long-term operation of the parameter tester, the internal resistance and other related test parameters will be deviated. Therefore, it is necessary to adjust the machine parameters regularly to ensure the accuracy of the test parameters. Test equipment in a considerable part of large PCB factorises are half a year or a year to maintain the whole machine, adjust the internal performance parameters. The pursuit of "zero defect" Automotive PCB has always been the direction of the majority of PCB people, but subject to the limitations of process equipment, raw materials and other aspects, so far PCB world's top 100 enterprises are still exploring ways to reduce ppm. （PCBworld）