Electronics Forum | Tue Jun 19 20:42:49 EDT 2001 | davef
So, they want you to talk through a justification for mixing fluxes? That's GREAT, if you can get away with it!!! Tell us more about Safety Clean.
Electronics Forum | Wed Jun 20 11:43:11 EDT 2001 | genny
M.G. Chemicals "Safety Wash Cleaner Degreaser". A primarily ethanol / methyl alcohol product. Part number "405". Brushes, Kim Wipes, or cotton swabs have all been used from time to time to apply it to the PCB.
Electronics Forum | Tue Jun 19 18:14:04 EDT 2001 | davef
So when xray inspection time becomes excessive, what things can happen? What are the warning signs that inspection times could be getting longer than they should be?
Electronics Forum | Wed Jun 20 16:09:21 EDT 2001 | Gil Zweig
Clearly, x-ray inspection should not become a bottleneck in the production process. The concept of "signature" identification is to rapidly qualify a BGA attachment as acceptable or suspicious. If suspicious, the board is taken off line for further s
Electronics Forum | Mon Jun 18 18:17:10 EDT 2001 | davef
What to you consider to be the minimum resolution [micron] for: General, BGA, die attach uBGA, flipchip, wire bonds Wire cracks, delamination Microcircuit failure What is the relationship between resolution [micron] and the kV of the tube?
Electronics Forum | Wed Jun 20 15:56:33 EDT 2001 | Gil Zweig
For the applications you mention you would probably want to resolve details of at least 8 microns (0.0003") which would translate into a bare minimum resolution requirement of 60 to 100 line pairs per millimeter at a minimum geometric magnification o
Electronics Forum | Mon Jun 18 18:18:43 EDT 2001 | davef
Finding and troubleshooting cracked BGA solder connections are a real pain in the neck. Please describe how xray fits into this process, the type of machine used, and how that machine is used in conjunction with other equipment.
Electronics Forum | Mon Jun 18 18:28:07 EDT 2001 | davef
We are assembling BGA [Texas Instruments (TMS320C6201)] that has metal slugs in the packaging that act as heat sinks. What are your recommendations for inspecting the solder connections on such devices?
Electronics Forum | Mon Jun 18 18:29:54 EDT 2001 | davef
What are some useful applications of the typical xray equipment that people purchase to inspect BGA, beyond the original intent?
Electronics Forum | Tue Jun 19 17:56:04 EDT 2001 | genny
We don't currently use BGA's on any of our products. Are there other worthwhile reasons to use x-ray that would benefit enough from it to justify it economically? Also, I have heard that to put it inline can cause bottlenecks.
