Electronics Forum | Fri Feb 21 19:41:25 EST 2003 | neil
I have had a look at what Bob Willis say's and the answer to my problem is not there. The paste we are using has a very high viscosity and I beleive that if we reduce the metal content to less than 90% it will solve the problem. The problem is parti
Electronics Forum | Wed Jul 23 17:07:27 EDT 2003 | dbdavis
Dear Colleagues, I'm am experiencing some problems with nonwetting of primarily 0603 packages. The problem is infrequent but occures just enough for my QA dept. to notice. My reflow profile seems to be correct and the vast majority of parts solder f
Electronics Forum | Mon Sep 20 19:46:16 EDT 2004 | pabloquintana
We use Envibar UV 1244 to coat our PCBs after wave soldering. We clean them with alcohol, and then we coate them manually with a brush. Then they are passed through a UV Oven. We have adhesion problems, and we started by looking at the Envibar, but
Electronics Forum | Sat Nov 06 17:45:51 EST 2004 | Chunks
Depends mainly on your paste. Evaporation of alcohol/flux is your main concern. But most name brands last with no problem. What's "some time"? If it's hours, no problem - if it's days possible problems with evaporation -if it's weeks, just buy so
Electronics Forum | Mon Aug 15 09:41:57 EDT 2005 | Ron Herbert
Ken, I am with Technical Devices and I'm sorry you feel that way. Is there a reason for you comment? We try to do our best to make our customers proud they decided to purchase our machines. If a customer has a problem, and he or she notifies us of
Electronics Forum | Mon Mar 05 13:22:20 EST 2007 | blnorman
We use (and have for some time) used No-clean on our radio boards with no problems. We also conformally coat with a platinum catalyzed, addition cure silicone coating with occassional problems. These silicones are prone to cure inhibition or retard
Electronics Forum | Fri Jun 01 22:09:03 EDT 2007 | mika
Hi Aj, What type of QFP are we talking about? We had in the past big problem with QFP-304 0.5mm pitch from ALTERA. Similar as you describe. Note. No problem with QFP-256 or QFP-196 0.5mm pitch, or anytying less than -304:s Can You be a little bit mo
Electronics Forum | Fri Nov 09 15:09:42 EST 2007 | mmjm_1099
Hopefully this will help you. I happen to have a few similar problems with PN# MC33982BPNA. I had the stencil made at 6mil thick and had a step-down for 5mil in the problem areas. That seems to take care of the problem we had at the time. ALSO FORGOT
Electronics Forum | Tue Jan 12 17:51:41 EST 1999 | Tom Gervascio
I've been using selective soldering process for about 18 months. The major problem concerns tight spacing- the distance between the SMT pads to be masked and the thru hole leads to be wave soldered should be no less than 0.150 inches. Keep the wall
Electronics Forum | Thu Mar 09 20:48:30 EST 2000 | Dave F
Van Hoang: Welcome to SMTnet!!!! Regarding your problems: 1. Cleaning glue: Check the SMTnet archives. For instance, a recent thread was: cleaning glue off of stencils - pr 13:41:43 03/03/2000 2. Bridging on the wave: Bridging on the wave h
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