Electronics Forum | Tue May 06 06:29:06 EDT 2003 | yukim
Hi, No, the layout is different, but both have chips located arallel and perpendicularly to the flow direction. And we do have defects in both orientation. What about the PCB warpage? Sometimes we find warped PCBs. Could this affect? Thanks, Yu.
Electronics Forum | Thu Apr 24 23:04:45 EDT 2003 | yukim
I've been struggling with this problem for a while. We have two products: A, which is Ok and B, with tombstone defect (0603 & 0805 capacitor chips). A & B have the same design: pad sizes, separation between pads, components orientation. Both have s
Electronics Forum | Wed May 21 12:55:35 EDT 2003 | Zhenya
Several things for your reference: 1. Starting with data collection: - Have you done a measle chart to illustrate the pattern of the defect? - Have you checked the corelation between shift/time and defects rate? - How about a pareto chart? - Do