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Electronics Forum | Mon Nov 25 12:57:29 EST 2002 | caldon
Maxtim- I have used APE's Sniper, airvac, Mecal's 3500, PDR, Pace, and MArtin's rework stations. APE Sniper does the Job but to much automation and not user friendly software. PDR is to much IR and no convection. Metcal's work good now with the ne
Electronics Forum | Sat Nov 23 10:19:39 EST 2002 | davef
This sounds alot like the warping that we all see periodically in BGA. CTE of material is temperature dependent and not temperature changing rate dependent, so you are pretty much hosed by the physics. Regardless, I do like trying like crazy to g
Electronics Forum | Thu Dec 05 17:40:24 EST 2002 | davef
While unfamiliar with some of the terms you use, could this be what you seek? http://www.pcbstandards.com/downloads/Metric%20Environment/General%20Documentation/PCB%20Design/PCB%20Design%20Routing/Metric%20BGA%20Routing.pdf Stepping backwards just
Electronics Forum | Thu Dec 12 00:36:11 EST 2002 | Frank
We had one of these years ago. We had trouble with it recognizing fiducials consistently, but other than that it ran good. This assumes that the left head, which is mechanical centering, is working good. And I believe that the minimum component
Electronics Forum | Fri Dec 13 12:10:36 EST 2002 | STEPHEN WALTERS
WE ARE EXPERENCING OPEN 8 MILL VIAS UNDER THE BGA'S, THEY ARE OPENING AFTER THE ASSEMBLY PROCESS, THEY ARE FROM MULTIPLE PCB VENDORS, THEY PASS AT THE PCB SUPPLIERS TESTING, AND WE HAVE FOUND THAT THEY HAVE HAD 2 MAJOR CAUSES 1. BUBBLE INTRAPMENT, 2.
Electronics Forum | Thu Dec 19 13:10:49 EST 2002 | gramsey
Really? Where does it say that? I have had the opposite experience and 3.2.2 from the IPC-7525 states for square or rectangular apertures - "Having a radiused corner for all apertures can promote stencil cleaning". It actually recommends circular ape
Electronics Forum | Sat Dec 28 02:58:12 EST 2002 | emeto
If the problem is in the big thermal pad.The surface strains in that pad are different then the others and through the reflow period there is an affinity between them(only if they are too close). I recommend you to reduce the theramal pad. Make smal
Electronics Forum | Mon Mar 24 08:57:20 EST 2003 | russ
I don't know if I would call it a "blow hole". what I believe happens (I don't have a camera to watch spheres during the reflow process) is that when the flux starts heating up, expansion, bubbling, or something physically displaces the balls. We fo
Electronics Forum | Thu Feb 27 15:33:37 EST 2003 | James
We need to use water-soluble paste due to cleanliness requirements. No-clean does not mean No-contamination. I have talked to a lot of people who use no-clean and they still wash their boards except now they have to use chemicals to do it. So, you
Electronics Forum | Fri Mar 21 10:28:27 EST 2003 | mantis
Sorry i didnt explain it vey well,the parts that are misaligned are always sitting next to these particular tanatlum capacitors.It affects 0805 parts and A tsop36 and can even cause a short on a bga right in the corner where the tant sits.If you chan
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