Electronics Forum | Thu Oct 04 09:44:24 EDT 2007 | hussman
It realy depends on your product. Tighter tollerance boards require a better machine, which costs more money. Multi-layered baords wih a alot of heat sink will require preheat - something a lot of selective solder machine do not come standard with.
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 | Thu Apr 01 15:19:54 EDT 2010 | dilogic
We've got prototype 6-layer PCB's and I suspect that mfg. swapped some internal layers. Would it be possible to use some form of x-ray inspection to verify that? Any ideas?
Electronics Forum | Fri Feb 24 02:33:29 EST 2012 | soppcb
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Electronics Forum | Wed Dec 19 09:41:14 EST 2012 | dyoungquist
What is your solder pot temperature? We found that on a 0.093" multilayer board increasing the temp of the lead free solder from 300C to 315C helped with the barrel fill.
Electronics Forum | Tue Jun 05 06:37:48 EDT 2012 | mosborne1
Definition: Pink Ring - A condition that can exist in multilayer printed circuit or wiring boards, in which the oxide around a through-hole inner layer interface is chemically removed, and there is a lack of adhesion of the inner layer to the dielec
Electronics Forum | Mon Jul 30 20:38:02 EDT 2012 | davef
I'm with you on microcracking. The best way to confirm this is through sectioning of the affected capacitors. You're fortunate to be seeing these failures showing-up early in your product life. Of times these failures don't appear for years.
Electronics Forum | Wed Aug 22 12:44:26 EDT 2012 | rway
I would look at your de-paneling process. How are you cutting the boards? This could be inducing mechanical stress on the component; especially if the part is close to the edge of the pcb and perpendicular to it.
Electronics Forum | Wed Aug 22 13:16:23 EDT 2012 | rway
Most likely the depaneling is not your issue, but I do concur that there is some mechanical stress occurring somewhere. What about any fixturing for FT/ICT?
Electronics Forum | Wed Aug 02 23:28:44 EDT 2017 | dawson
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