Electronics Forum | Thu Jul 26 08:51:41 EDT 2018 | nickt1
What problems will be encountered in subsequent PCB processing. Already finish test boards
Electronics Forum | Sat May 02 08:48:32 EDT 2009 | davef
You have a board defect. Any moisture and/or organic contaminants trapped by the solder resist during lamination may cause solder mask delamination, blistering and/or adhesion loss during subsequent soldering operations or during extended use.
Electronics Forum | Thu Nov 10 21:33:17 EST 2022 | stephendo
So if you stored them in a nitrogen cabinet then you would reduce the O2 diffusion as well as keep moisture out of the boards.
Electronics Forum | Thu Apr 14 17:24:06 EDT 2022 | cbart
depends on board finish and PCB substrate materials. If you were using OSP or silver finished bare boards the time to process is less than an ENIG or HASL finished. certain substrate material absorb more moisture than others or at a quicker rate. so
Electronics Forum | Wed Jul 04 12:35:19 EDT 2001 | davef
I thought I responded this this a while ago, guess NOT!!! Wow, Dano yagot Entek boards that are that old!!!! Coo. Sounds kwazy that you�d end-up with that volume of old boards, but it�s probably one of those deals where correcting the problem keep
Electronics Forum | Tue Jun 20 10:26:07 EDT 2006 | samir
Chunks, I used to work in power electronics, and we had this design engineer who used to "blow moisture" on the high-impedance circuit and test for cleanliness. We were water washing in a OA-Water Soluble environment. He was convinced that there w
Electronics Forum | Fri Nov 16 08:46:30 EST 2007 | jdengler
For very simple boards, 2 layers lightly populated with light thermal mass, we still use FR4. For most of our Pb-Free boards we use the higher Tg material with moisture-resistant packaging. We are a CM so we don't usually get to change many of the
Electronics Forum | Thu Aug 28 04:07:46 EDT 2008 | kelson
Hi robinj As you have mentioned, if the color is yellow usually it is caused by moisture left on the boards from poor drying after immersion silver. However, our boards were received from the supplier and the changes happened in our side. So, what di
Electronics Forum | Thu Nov 10 12:29:57 EST 2022 | stephendo
The G in ENIG is gold. It does not oxidise. Either you are thinking of OSP or your board shop is providing defective boards if your boards show oxidation. It would be the nickel that is oxidising but should be totally covered by the gold. Is there
Electronics Forum | Tue Apr 12 12:08:06 EDT 2005 | Dave G
I use the solder sample pcb that comes w/ each batch of boards. We ask our pcb vendor to send 1 pcb for solder testing w/ each batch. This is usually a pcb that is completely done it just didn't pass electrical test @ the final stage. I kill two bird
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