Electronics Forum | Thu Dec 19 14:29:03 EST 2002 | mark
It sounds like the stencil wasn't polished. Most stencil sources that only offer laser cut stencils do not have the electro polishing chemistry because they don't want to deal with the waste treatment issues. I suggest you verify that the stencil is
Electronics Forum | Thu Dec 19 14:29:06 EST 2002 | mark
It sounds like the stencil wasn't polished. Most stencil sources that only offer laser cut stencils do not have the electro polishing chemistry because they don't want to deal with the waste treatment issues. I suggest you verify that the stencil is
Electronics Forum | Wed Sep 24 08:34:57 EDT 2003 | stefwitt
Even when you run a board several times, the machine may not make the same travel path every time. This in itself does not create a problem, but the vacuum on the nozzles could be different, dependent on the configuration of components on the heads.
Electronics Forum | Sat Nov 08 10:04:26 EST 2003 | severs
Once you have selected your plating based on electrical and physical requirments, you should know that there is an inexpensive plastic storage packaging developed by Lucent which can keep any platings solderability from degrading for up to 10 years o
Electronics Forum | Mon Jun 07 17:58:12 EDT 2004 | Rob
UPDATE: Just for fun... I sacrificed a scrapped board to determine what remained and what fell and this is the result. Board dimension was 18"x9" and .9" thick. Components consist of hundreds of passives plus 386 proc (QFP256), TSOPs, SOLs 14/16/20,
Electronics Forum | Tue Jul 06 17:10:19 EDT 2004 | Pete
Quality, consistency and labor savings all wrapped up into one nicely packaged piece of electro-mechanical marvel called AOI. Look for the number of templates one can store per component, lighting options, can it do through hole? Look at reporting
Electronics Forum | Mon Feb 21 04:04:21 EST 2005 | abhirami
1.67 always on the sample boards measured. This is very fast and pretty good measurement for a paste dispense control. Boards do not stand out-side for long times. Inspect the height for critical components only, in the initial stages. Once your Cpk
Electronics Forum | Thu Mar 03 08:42:07 EST 2005 | cyber_wolf
I just ran into a reflow profiling problem with a new assembly that we are processing in SMT. There is a cluster of six or so electrolytic caps that measure approx. .710" wide by .660" tall. They are spaced .100" or so apart. When I run a profile, t
Electronics Forum | Sat Apr 16 13:43:53 EDT 2005 | KEN
What about electo migration? I had (what apears to be) the exact same problem you describe. X-ray and ICT fails to detect micro shorts. However, in our test, the bench functional test would show a current overload. In some cases the electro migrti
Electronics Forum | Tue Jul 11 12:59:26 EDT 2006 | mattkehoe@sipad.com
We are trying to apply solder to boards with 80 microinches of electro plated hard gold. No components involved, just print 63/37 paste and reflow. The results are very poor on some boards, not so bad on others? Pictures at http://www.sipad.net/thick
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