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 | Fri Aug 18 09:07:22 EDT 2006 | russ
pretty much menaing Amol, that the balls are stuck to the board by flux and when you wash the flux the balls go away with it. If yopu are running no clean, then there will be no cleaning step and the balls will remain since the flux is basically unt
Electronics Forum | Tue Apr 09 16:31:49 EDT 2013 | alfredodsanchez
Hello everyone! I have a problem with PCB, we detect that some contamiation apear (dark spots similar to glue or underfill) we detect that this element is Policarbonate. I don't know if on PCB fabrication process some policarbonate are used. We alr
Electronics Forum | Fri May 17 13:33:45 EDT 2013 | bandjwet
How are you removing the remnant cured coating materials once you scrape. laser ablate or use walnut shells to blast coating material from a PCB? We are using a soft bristled brush or a vacuum source. What about liquids such as cleaning solutions o
Electronics Forum | Tue Jul 16 12:24:25 EDT 2019 | slthomas
In VERY general terms, water soluble flux is usually better at getting good wetting of the soldered connections unless you have a very well controlled process, in which case no-clean can be very handy (you don't have to clean). Water soluble flux re
Electronics Forum | Wed Mar 01 09:56:15 EST 2006 | russ
I would definitely try a more agressive flux. Are you using a W.S. or No-Clean? And of course check the usual preheat temp flux application dwell time immersion depth
Electronics Forum | Tue Jul 04 07:40:22 EDT 2006 | slaine
I had a couple of reps in from Indium a few weeks back, and they were promoting a flux for rework that was designed to have low SIR, No clean. Havent tried it yet. The product is Flux NC 771, might solve your problem? Regards Slaine
Electronics Forum | Tue Jan 06 21:19:05 EST 1998 | Dominic Nguyen
We use no clean paste and sometimes experience flux splattering which gives spot on gold fingers. Need help in analize the cause. thx.
Electronics Forum | Fri Feb 01 13:33:08 EST 2008 | cyber_wolf
Its most likely flux residue from your paste. This is normal in my experience. Just clean it out. Some paste fluxes are waaaay worse than others.
Electronics Forum | Mon Jul 19 08:52:02 EDT 2004 | Omega
Try spraying flux on top of the loaded PWB when you put it on the conveyor. The tackiness of the flux does a pretty fair job of keeping the axial leaded parts down to the board. This takes more cleaning, but it has worked wonders for me on assemblies
