Electronics Forum | Sun Jan 25 17:40:16 EST 2009 | cuperpeter
Hello All, I have a problem with nonwetting Au finish after second cycle of reflow soldering doublesided boards. Solder nonwetted pcb pads (is wicked to component terminations) Either these pads or some of non component pads became discoloured from
Electronics Forum | Tue Feb 03 16:42:50 EST 2009 | cuperpeter
Hello All, > > I have a problem with nonwetting Au > finish after second cycle of reflow soldering > doublesided boards. Solder nonwetted pcb pads (is > wicked to component terminations) Either these > pads or some of non component pads became
Electronics Forum | Wed Mar 18 11:39:06 EDT 2009 | chrisgriffin
Greg, You guys are right, it was a thermistor. I believe the machine was powered up with the wrong voltage. Here is what gets damaged if the transformer is tapped for 230 and you apply 480: 1. Both CPU modules on the MX100 PLC's blown. 2. Both col
Electronics Forum | Wed May 12 13:34:02 EDT 2010 | hegemon
Thanks Pete B - great info. I am currently preparing a DOE to address concerns about reflow of componentry on the bottomside of the PCB while in the vapor. Specifically cosmetics and part dropping. Bottom side has no flux, but will be fully reflow
Electronics Forum | Wed Oct 06 04:11:35 EDT 2010 | grahamcooper22
I've done minimal research to this point and > understand my issue with solder on the double > sided boards is due to oxidation that occures on > the unpopulated pads when the board makes its > first trip through the reflow oven. > > We did run
Electronics Forum | Thu Oct 28 11:50:11 EDT 2010 | phase1
We are having a little trouble with what appears to be a crystalization between our fine pitch parts. The problem appears after a a thourough wash of the pcb when dry. It looks like lead wiskers/haze between the joints.We are using water soluable lea
Electronics Forum | Wed Nov 17 11:51:24 EST 2010 | vetteboy86
We have a problem child part. Our company was in a pinch and ordered parts from a broker that had an old date code. The leads are very oxidized, and our reflow process is comprimised. To prove the concept, we cleaned the leads with Tarn X and an aci
Electronics Forum | Mon Mar 07 10:59:17 EST 2011 | SheanDalton
RK, what are you trying to remove? What are you trying to remove it from? And, what type of equipment do you have? Generically, I suggest a saponifier, related to other aqueous chemistries, is associated with: -- higher PH -- need for effective che
Electronics Forum | Mon Jun 25 16:16:01 EDT 2012 | rway
I have some suggestions. We have been fighting bad fids for years. Some things we have tried that have helped is: 1) Look at your relief area around your fid. Does it butt up against the solder mask. We allow 20 mil around the fid as a relief ar
Electronics Forum | Fri May 24 14:42:42 EDT 2013 | davef
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