Electronics Forum | Mon Apr 28 11:13:21 EDT 2008 | ck_the_flip
Here's a crude wettability test. Take a PCB - both types of finish - print them, and reflow with no components using your standard profile. Observe the wetting spread and flow of the solder paste. This rules in/out that it's PCB solderability.
Electronics Forum | Fri Apr 25 13:30:45 EDT 2008 | flipit
I use Namics 8437-2 for micro BGA and flip chips. Will work for QFN or MLF after soldering. Flows well under gaps as thin as 0.001". Cure in 5-10 min at 150 C. Rock solid product. Is bit expensive. Is from Japan.
Electronics Forum | Fri May 02 11:36:21 EDT 2008 | fsw
I am of the same opinion! I don't think customer has clear idea of the underfill requirement. From our talks with them, it seems they feel that since the build is RoHS compliant, they feel more comfortable having an underfill on that component to cov
Electronics Forum | Sat Apr 26 08:18:47 EDT 2008 | davef
Your warpage problem could be caused by change in: * Multilayer board construction (not homogeneous or unbalanced - too resin rich or poor) * Supplier process capabilities (lamination cycles) * Material selections (usually cheap and dirty), etc.
Electronics Forum | Tue Apr 29 02:08:21 EDT 2008 | sin4d
Hi, I am also facing the same probelm. I assembly a substrate with a thickness of 0.30mm and the board warp after reflow. If I bake the substrate at 125 Deg C for 2 hours will it help to solve this problem? Thanks
Electronics Forum | Tue Apr 29 07:26:38 EDT 2008 | realchunks
Another area to look is on any breakaway. If they did not add copper to breakaway, it can warp your board if long enough. Seen it happen many times.
Electronics Forum | Fri May 02 09:38:52 EDT 2008 | jrae
It could be as simple as a new operator in lamination lay-up who is laying up 90 degrees against warp and fill.
Electronics Forum | Fri Apr 25 15:54:10 EDT 2008 | diddy
What is the reject rate for Wafer Chip Scale Package for Surface Mount equipment espcially with Fuji NXT?
Electronics Forum | Mon Apr 28 09:34:21 EDT 2008 | cyber_wolf
Does anyone have a source to get IP3 parts cameras fixed ? Camera type is FH2048BNA
Electronics Forum | Wed May 07 16:51:24 EDT 2008 | fujillews
Hi I can't offer a repair service but i have many in stock for sale with warranty. please email llew at sales@alternativesmt.com for a quote
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