Electronics Forum | Mon Feb 10 10:23:53 EST 2020 | emeto
Solder paste has stencil life time - if you go over it means you should change it. If you print boards in front and keep them for too long before reflow, the flux is still evaporating, so you are not mitigating the risk. Paste also likes room tempera
Electronics Forum | Wed Feb 02 21:17:55 EST 2000 | Steve Harshbarger
Istvan, The advise from both Roni and Mike sounds right on the money. The problem is most likely that your PCB is not completely dry (the flux has not completely evaporated) in the area where these solder balls occur. You have a number of differen
Electronics Forum | Thu Jun 29 17:38:51 EDT 2006 | flipit
I might be wrong since I don't know this piece of equipment but I think ROL might be a better measure. For 63/37 it used to be 20 ppm ROL (residual oxygen level) was about what you needed for a reflow oven. This is to take full advantage of all tha
Electronics Forum | Wed Dec 13 16:47:41 EST 2000 | Michael Parker
It is apparent that you have evaporated the flux before you reflowed. You got lucky when the paste slumped and you didn't get major problems elsewhere. A more reliable solution is to adjust the stencil apertures for the part that is experiencing bri
Electronics Forum | Thu Sep 14 11:39:59 EDT 2000 | Steve Thomas
Ahhhh, Dave, I'm glad I can still count on you for some real cutting edge info. yuck, yuck. Believe me, there's a lot more information available on how to resolve no-clean issues than there is on how to keep this stupid board wash/DI/Stencil wash/
Electronics Forum | Tue May 23 15:01:24 EDT 2000 | A. Marques
Hello, I think the problem can be: 1.�- some humidity in the adhesive, 2.�- some bubble of air in the adhesive when you cured the adhesive some humidity will go evaporate and when you make the soldering the same soldering will make a bridge between t
Electronics Forum | Tue Feb 20 13:10:54 EST 2001 | billschreiber
Hello Dave, Before I get into waste management, I must first stress the importance of checking with your local regulating agencies. Every area can be and usually is different. California regulations differ from Ohio and Ohio�s are different than Mu
Electronics Forum | Fri Jul 23 15:47:31 EDT 1999 | C.K.
| Does anyone have any experiences with EMC stencil screen cleaners or can you recommend a good one? | SMarTsonic makes an excellent cleaner. As Bill states, it uses ultrasonics and an EPA approved detergent to wash stencils and boards. However,
Electronics Forum | Fri Jul 23 15:49:35 EDT 1999 | C.K.
| Does anyone have any experiences with EMC stencil screen cleaners or can you recommend a good one? | SMarTsonic makes an excellent cleaner. As Bill states, it uses ultrasonics and an EPA approved detergent to wash stencils and boards. However,
Electronics Forum | Mon Jan 11 18:54:35 EST 1999 | Dean
| This question is directed to anyone having eperience with Sn62Pb36Ag2 solder balls for BGA's. | Have you seen anything like a rough, raisin-like surface texture after ball attach? If so, what did you do about it? | | Thanks! | I have seen this be
