Electronics Forum | Wed Feb 21 05:52:17 EST 2007 | Stephen- SMT engineer trainee
Some of the blister in solder mask, normally 1 circle blister(about 1cm in Dim.) in each PCB. In addition, there are also blister in laminate, the also look like 1 circle blister(about 1cm in Dim.) in each PCB.
Electronics Forum | Fri Mar 16 07:10:53 EDT 2007 | davef
1 Print paste on a bare board or laminate. 2 Place components in the paste. 3 Gently invert and support the board above a table. 4 At one hour intervals, record the number of components that have fallen from the board.
Electronics Forum | Fri Mar 30 14:47:27 EDT 2007 | GS
MSL 3) By SAM (Scanning Acoustic Microscope) before to remove them from PCB, you could identify if de-laminated or not and the degree of delamination. Best Regards...GS
Electronics Forum | Tue Jun 05 15:10:24 EDT 2007 | jax
Am I missing something? Get the Laminate Sizes from your suppliers, and make your own Array Files. You might need to include tooling holes for the Fabrication house but they will surely supply you with the information that they need. This way you
Electronics Forum | Thu Aug 02 16:28:16 EDT 2007 | gregs110
Maybe much more detailed than you have available but do you know the exact prepreg number you were using in the failed units? That is one of the only similarities I have been able to isolate on my parts - I am curious if it may be the same. Thanks,
Electronics Forum | Thu Aug 02 18:00:09 EDT 2007 | swag
I'm not sure what it was. It would be tough information to get as it's an old issue and sore spot with our supplier. I'm not even sure if we use them anymore for these boards.
Electronics Forum | Thu Nov 22 09:14:06 EST 2007 | paulallan
Does anyone have any experience in point to point laser soldering and laser light reflecting off of SMT component 'J' leads down on to the laminate. This appears to be a random situation we cannot understand nor control.
Electronics Forum | Fri Dec 14 13:39:31 EST 2007 | adlsmt
We are trying to find an ESD safe laminate to make ID badges that we can scan bar codes through. Anyone using anything like that? Thanks!
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 | 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.
