Electronics Forum | Tue Oct 03 16:40:28 EDT 2006 | slthomas
It's a consignment kit and we already have the parts. Otherwise I'd tell them to panelize the thing and we could build all 30 in one pass. I may be able find a 25 mil QFP on a stencil and hand print that one part if the apertures are long enough. D
Electronics Forum | Mon Apr 02 18:31:13 EDT 2007 | SWAG
I hate to drag this one out again but we are done with this. We tried an oven profile on the bare panels that was quite different from our original. This profile was recommended by the mfg. of the laminate. We experienced random delamination. Som
Electronics Forum | Fri Nov 17 14:55:27 EST 2006 | CK the Flip
Typical of QE types. They don't know the entire process of qualifying what makes a "good" board (besides FPY), so they just arbitrarily come up with 95% FPY as a benchmark. Russ made a great point that alot of yield issues are design-related. Typi
Electronics Forum | Fri Dec 15 11:06:06 EST 2006 | Gman
Hello All, Is Ionic Cleanliness testing using say an Ionograph on No-clean assemblies a valid test? If not, why? I understand factors like PCB cleanliness but is the 1.56ug/in2 IPC criteria valid for no-clean assemblies and can an Ionograph be used
Electronics Forum | Wed Feb 21 21:01:57 EST 2007 | davef
Yes. Heat reduces OSP solderability protection thickness. For instance, many OSP are shot at the end of the first reflow pass and the exposed copper is free to oxidize. If you're speedy, you can pull-off the second reflow cycle before the copper g
Electronics Forum | Thu Feb 08 15:05:32 EST 2007 | realchunks
Wow, what a bunch of crabby old men. BGA opens can occur from pre,during or post process. I never chimmed in cause the original poster said they would performa a dye test. Yet as usual, they never get back to this forum on what the cause was. So
Electronics Forum | Wed Apr 25 15:50:06 EDT 2007 | Upper Management
Dear Ms. Chunks, Your valuable input has been noted. Unfortunately, your approach won't work in this case. Our customers would like for us to have AOI. To be perfectly honest with you, if we could just rig up some camera-looking thing that move
Electronics Forum | Wed Apr 25 15:54:59 EDT 2007 | Upper Management
Dear Ms. Chunks, Your valuable input has been noted. Unfortunately, your approach won't work in this case. Our customers would like for us to have AOI. To be perfectly honest with you, if we could just rig up some camera-looking thing that move
Electronics Forum | Thu Apr 26 11:21:26 EDT 2007 | slthomas
Question...when the machine said something was wrong, was it reading something wrong (false failure), or was there a true descrepancy but not one that resulted in a bad connection (bridge or insufficient)? Also, did you perform a DOE on the process
Electronics Forum | Mon May 07 11:08:13 EDT 2007 | gregoryyork
Are the pallets hot and killing the foam head as they pass over or is the air pressure on the air knife toi high travelling back along the board killing the foam. If these are OK make sure you have sufficient back flow onthe wave and you are draining