Electronics Forum | Fri Nov 22 11:31:52 EST 2013 | igorfo
Hi I aa QE on SMT line that produce products for Home introduction. No so long ago we have a problem with soldering of BGA Head on Pillow (root cause mismatching customer requirements and BGA profile spec, suplier change %Ag) and our product affect
Electronics Forum | Fri Nov 22 16:55:30 EST 2013 | hegemon
Head and Pillow defects beneath a BGA are difficult to find, no matter what the equipment is on hand. Since you do not appear to have access to tools that would help you, or $$ to purchase said tools, I might recommend that you use an outside source
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
Electronics Forum | Thu Dec 12 09:46:34 EST 2019 | pavel_murtishev
Hello, Could you please tell me how you define a defect to be a mass one? What is a criterion? Numbers? How to distinguish between a set of simple defects and a mass defect? What metrics you use? Any input would be appreciated. Thank you in advanc
Electronics Forum | Thu Dec 12 18:06:52 EST 2019 | davef
Pavel ... Please click on the link under my avatar [left] and shoot me your email address. Thanks
Electronics Forum | Fri Dec 13 10:10:45 EST 2019 | davef
Thanks, Pavel There are lots of explanations of how to use AQL Charts and Sampling Plans on the web.
Electronics Forum | Thu Dec 12 21:44:15 EST 2019 | davef
I don't know what a "mass defect" is. Defects are within AQL [acceptable quality levels] or they aren't. I start at General Inspection Level 2 in the AQL Chart ANSI/ASQ STANDARD Z1.4-2006 and a sampling plan ANSI/ASQ Z1.4 Adjust the Level for Budge
Electronics Forum | Fri Dec 13 13:35:49 EST 2019 | stephendo
I'm about to go to my doctor. I think he will say I still have too much mass. Although he may not use that terminology.
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