Electronics Forum | Fri Aug 04 14:44:23 EDT 2006 | bvdb
RoHS actually allows for up to 0.1% lead in solder. Unless you are really sloppy at cleaning your tools it would be very unlikely that you would get 0.1% lead into your lead-free process (remember leaded solder is only about 50% lead). Regards, Ber
Electronics Forum | Fri Aug 18 14:00:27 EDT 2006 | slthomas
Chunks is a pretty with-it dude. The only additional thought I have is the possibility of poor misprint cleaning. If they're wiping instead of spray or US washing they may be contaminating the boards prior to reprinting. And yes, I know Chunks is
Electronics Forum | Tue Oct 31 17:36:38 EST 2006 | slthomas
In my other, better equipped life, we'd wipe them down manually w/dilute IPA then run them through the inline cleaner, nc or ws. I'd avoid US unless you've qualified your process to verify you're not damaging parts with it.
Electronics Forum | Thu Jan 18 13:13:53 EST 2007 | russ
won;t recommend a paste since I propose that you do not use but here is a flux I have had great success with Indium tacflux 20B IPN 84283 No clean flux, Use this alone without paste and your BGAs will work!! What was your package temp during th
Electronics Forum | Thu Mar 29 08:52:59 EDT 2007 | realchunks
Hi George, Depending on your product, wave soldering twice is not all that bad. Residues will be higher, but should only be cosmetic unless your product is sensitive to ionic contamination. You can set-up an alternate profile on your wave for 're-
Electronics Forum | Mon Apr 23 17:03:14 EDT 2007 | Theresa Spear
Thank you all for your feedback. Our backside are 99.9% with passive components. However, we do have a lot of through hole components on boards. To go totally selective soldering the equipment can be quite expensive. Most of the time, we left the com
Electronics Forum | Fri Jul 13 09:43:16 EDT 2007 | lococost
wow, never heard of such a thing! Are you sure it's allways different types of material? Are you using a washer that isnt cleaned regular? I would check your product step by step, from bare PCB to finished product to find out where exactly in your
Electronics Forum | Tue Aug 28 15:13:17 EDT 2007 | rgduval
Lead-free? White-tin finish? Even if it's not, it sounds like a moisture/contamination issue. If your boards must sit in stock between reflow/wave, consider giving them an alcohol bath to clean up any contamination, and a good baking to remove any
Electronics Forum | Thu Aug 30 06:57:56 EDT 2007 | simonalden
Hi we are currently experiencing a problem with solder contamination of the gold contact pads on our pcbs following the reflow process, possibly through sputtering. We have been advise that this can be caused due to the pcbs being humid or due to th
Electronics Forum | Fri Nov 09 10:58:03 EST 2007 | devajj
Best I can tell (Factory is in Mexico) is no solder from paste print. I'm ordering e-fab type stencils for them hoping to get better release. Also mandating they clean after each print, rotate their paste to keep it fresh, do LSM checks each hour f
.gif)
