AXI Inspection Study With Heavily Shielded Press-Fit Connectors (IMPEL)Authors: Chin Weng Tan, Yoke Hong Tan, Alvinkw Leong, Sreedharan Kelappen Kanaran, Zhen (Jane) Feng, Ph. D., David Geiger, Patrick Tan, YK Chan, Jim Lin and KT Tan
Date Published: 2/6/2017 Conference: Pan Pacific Symposium
In this paper, we would like to share our experience with challenging Impel Press-Fit connector. Current PCBA populated with total 16 Impel connectors are go through AXI inspection process, to ensure that all the pins are properly inserted and ensure no bent pin, crushed, broken off and smashed issues enclosed inside the PCB drill hole.
We have been working with AXI-A, AXI-B and AXI-C, and looking for inspection solutions since July 2015. AXI-A is normal AXI (Automated X-ray Inspection); whereas AXI-B are equipped with Computer Tomography (CT) capability. AXI-C is AXI without CT capabilities. AXI-B has the capability to detect connector defect with very clear X-ray images, and judgement of the pass/fail are very much on dependent well trained AXI operator. However, AXI-B testing times are longer than AXI-A, especially inspection PCBA with Impel connectors.
We overcome all the arises issues and successfully develop a good method on the algorithm and threshold setting at AXI-B - it is discussed in detail in the paper. With the join studied for the past one year between Flex Penang P1 team and AXI-B Engineers including R&D support, our result of the collaboration is very impress. Machine defect escapee rate has been tremendously brought down from about 20% to 0% and false call rate DPPM has reduced significantly from >20,000 to <2000 PPM.
AXI with CT, Impel Press-Fit Connector
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