Electronics Forum | Fri Jun 17 13:14:34 EDT 2005 | Doug
Dave, The finish I'm most familiar with is the "white" tin by Omikron. Once the boards have been immersed the finish takes on much more of a white color however I have seen other immersion tin finishes where they are dull or bright in color. This is
Electronics Forum | Wed Sep 08 05:17:04 EDT 2010 | eddtsk
Hi, ran across a batch of PCB that has white silkscreen during receiving but turns purple/pink after our reflow process. SEM/EDX test can show there is no significant different element between the white and purple silkscreen. Can any help advice what
Electronics Forum | Sat Mar 14 15:48:40 EDT 2015 | horchak
The white haze is definitely an indication of moisture being trapped in uncured or improperly applied solder mask. You can verify this by heating up the board using a heat gun on an area of the board with the white haze, and if it clears up that is t
Electronics Forum | Wed Aug 03 12:18:49 EDT 2016 | dekhead
You don't say what kind of printers you are running, but if you had multiple light sources and independent control of direct an oblique lighting (either manual and software controlled) usually pretty "do-able". I have customer doing almost exclusivel
Electronics Forum | Tue Oct 09 10:29:47 EDT 2018 | dfl
Thanks Bob. Using a flashlight helps a lot, indeed. Is "re-adjust the angle" just a bend on the LEDs heads (by hand)? I will try. To replace de LEDs, can I use white ones? I believe with the reds I get less light than whites, but maybe the camera ne
Electronics Forum | Tue Jun 14 15:59:25 EDT 2022 | mikevb
Thanks! I just needed a response like that. I will do all that, and if it's still an issue, I'll change the x wagon encoder right? There are three encoders on the x wagon though? The white one on the x carriage, the white one on the x belt drive mo
Electronics Forum | Mon May 14 17:14:07 EDT 2001 | davef
First, consider checking the fine SMTnet Archives. Look for threads on "white tin", in addition to "immersion tin". We�ve had a cuppla good ones of late. Merix [http://www.merix.com] gives a good comparison of different solderability preservatives
Electronics Forum | Mon Jan 18 21:05:15 EST 1999 | Dave F
| I get white residue on my PCBs after vapor degreasing. No comments on the vapor degreaser. Yes, I still use one of these. I use a vapor degreaser and a 1,1,1 replacement solvent due to the quick clean and quick dry times. Anyway, I only get whi
Electronics Forum | Sun Jan 26 09:32:55 EST 2003 | davef
But soon after cleaning and drying with IPA, we find a white residue formation. A: IPA will not nothing to clean your board. The white residue is exactly what you should expect. Search the fine SMTnet Archives for background. >How do we avoid th
Electronics Forum | Wed Aug 17 14:18:11 EDT 2005 | ppwlee
Dave, Answers to your questions: * From your pictures, the white residue appears to be only on the solder mask. Is that correct? If not, what is the location [eg, solder, nonsolder/nonmask areas] of the residue that doesn't show well in the pictur
