Electronics Forum | Thu Nov 07 15:33:02 EST 2013 | mleber
Below are a few photos of an ongoing issue we are having with 1 pwb style. Some of the pads appear to have contamination that appears after the selective solder step. The joints are extremely hard to rework - almost impossible. We had the joints anal
Electronics Forum | Mon Aug 13 10:39:35 EDT 2007 | dphilbrick
If you can not find the source of cotamination then apply masking to fingers until you do find source, single layer of Kapton tape or similar should not affect print thichness. This will eliminate scrap / rework in the mean time.
Electronics Forum | Tue May 27 12:40:50 EDT 2003 | davef
Hi Bill You said, "silicon". We assume by your discussion that you ment to say, "silicone". For background on silicone and soldering, check with Dow Corning [517-496-6000]. They make a OS2 [VOC-free] silicone stripper and should be able to give y
Electronics Forum | Thu Mar 03 12:57:10 EST 2022 | dontfeedphils
Probably need more info on the PCB and why baking before reflow processing is part of your process, but if you're baking before reflow it makes sense you'd bake before rework. Is there a reason you don't AOI before wash?
Electronics Forum | Mon Mar 07 16:12:02 EST 2022 | chris007
This is recommended by our EMS to make sure flux is not cheating AOI.
Electronics Forum | Wed Mar 02 13:15:16 EST 2022 | chris007
I am currently working on a manufacturing flow where some PCBA are processed with reflow oven (after being baked before processing), then cleaned with bath, then passed into contaminometer, passed into AOI. The point is after all of this, if AOI dete
Electronics Forum | Thu Mar 03 14:01:16 EST 2022 | chris007
Hello Baking before solder pasting and reflow actually due to poential moisture development. This is JDEC requirement I believe to do so. We AOI after cleaning so we AOI a clean PCBA
Electronics Forum | Fri Mar 04 11:48:24 EST 2022 | dontfeedphils
Is there a reason the PCBA needs to be cleaned to inspect through AOI? I AOI thousands of "dirty" boards a day without an issue.
Electronics Forum | Thu Sep 19 21:17:50 EDT 2002 | Sam
We had encountered similar problem before. But the cause was found out to be the poor good plating, instead of contamination. The way we dealt with that was sending them to the supplier for rework. It may be the fastest and most relaibility way. Goo
Electronics Forum | Fri May 21 15:36:05 EDT 2010 | ccross
That is exactly the type of problem we are having. Some work, some dont. We feel these parts are not counterfeit so to speak but reworked, removed from other boards, cleaned up to some degree - hence the flux residue, black contamination, scrapes, wr