Electronics Forum | Fri Apr 04 10:02:20 EST 2003 | rdr
Do you reflow both sides of the boards before washing? Sometimes these white residues occur from "burnt" flux. we see this from time to time especially when using hot air and liquid flux. Russ
Electronics Forum | Fri Jan 08 18:28:04 EST 1999 | Bill Schreiber
When going to a "no clean" process, there are always two items that will require cleaning - stencils and pallets. You may also have a requirement to clean misprinted PCBs and possibly SMD adhesives. The Smart Sonic Stencil/Pallet Cleaning Process
Electronics Forum | Wed Apr 30 20:33:15 EDT 2003 | davef
Haaaa!!!! Yes, we�ve seen things like that. We found that a high input impedance amplifier worked fine in a room with a controlled environment and worked poorly in the sweat-shop portion of our plant. We were using good ol� WS609, straight water w
Electronics Forum | Tue Sep 14 18:27:37 EDT 2004 | MikeF
I would need a little more information to be able to rule out some of the possible causes. Have you checked to see if the pins with the minimal solder have anything in common, do all have traces to them? or internal power or ground plane connections?
Electronics Forum | Thu Sep 23 11:56:30 EDT 2004 | rkevin
We are printing on an assembly using SAC305 Alloy Sn96.5 Ag 3 Cu .5 with a no clean flux and getting virtually NO spread with either a ramp to spike or straight ramp profile. We are printing to standard FR4 board with immersion Ag finish. I am trying
Electronics Forum | Tue Dec 14 18:03:22 EST 2004 | Dreamsniper
Hi, Can you guide with the above? I read ROSE Test is a process control tool. What about Ion Chromatography, SIR and FT-IR. What Accpetance Criteria will I use for our assembly when using WS Flux? My WS Flus says it has 0% Halide so What can Ion Chr
Electronics Forum | Tue May 09 21:53:06 EDT 2006 | KEN
What is your flux delivery system? Tell us a little more....please. I'm assuming ultrasonic. You can try to vary your air knife but if your pin / hole ratios are wrong then it may not help. Run a bare fab. If your problem goes away you may need to
Electronics Forum | Mon Oct 13 08:43:56 EDT 2014 | rob
Hi Larry, Picture a old lady with a set of knitting needles with leads attached to them, pressing the needles into different points of the PCB (pads, test points or component leads) and measuring resistance, inductance, waveforms etc between these p
Electronics Forum | Fri Oct 19 13:57:17 EDT 2007 | Michael Konrad
Hi Rob, I must take issue with your statement �By definition, no clean solder can be not-cleaned�. All no-clean fluxes can be cleaned. Whether or not one cleans no-clean depends on a variety of factors. More than eighty percent of all post reflow
Electronics Forum | Wed Apr 24 21:27:10 EDT 2002 | davef
50�C. * Boards are too hot to be cleaned. Yes, saponified cleaners will remove heat decomposed WS flux. Well, I suggested changing paste to another poster, because he mentioned overheated solder connections and I guessed that his white residue was
