Electronics Forum | Wed Feb 07 21:56:00 EST 2001 | davef
Every critter out there with large incisors adapted for gnawing and nibbling has a different theory of solder ball formation. [My theory: It�s punishment for using NC fluxes. Stand and deliver. My solder balls end-up in the gross filter connected
Electronics Forum | Thu Feb 08 11:06:36 EST 2001 | pr
You oven guys are SOOOO sensitive! I must agree though, the oven profile made nowhere near the difference that the Homeplate did, in our place.
Electronics Forum | Tue Jul 10 03:14:19 EDT 2001 | winnifred
Steven, Dave is right, wash them away. Since it is RMA paste, you may need to have a saponifier to go for Semi-aqueous washing. Or you may want to contact your supplier for a cleaner to wash it away with some agitation ( ultrasonic). Mag.
Electronics Forum | Wed Jul 18 02:05:30 EDT 2001 | winnifred
Steve, To clean the RMA processed boards, u hv to make sure u talk to the supplier first, then get the right saponifier and do semi-aqueous cleaning.
Electronics Forum | Sat Jul 03 02:13:01 EDT 2004 | yukim
The manufacturer says that since this solder paste has synthetic flux (not natural rosin) it is sensible to humidity. Worked with reflow profiles, but no remarkable improvements. We are changing solder paste every 2 hours.
Electronics Forum | Tue Jul 06 08:10:34 EDT 2004 | yukim
The manufacturer confirmed that it is humidity - the solder paste is too sensible to humidity. Now I tried Koki solder paste with good result. But, it does leave flux residue in good quantity. Does anyone have experience with Koki solder paste?
Electronics Forum | Fri Jul 18 16:29:30 EDT 2008 | grics
Thats it. 6 mils works great with a 10% reduction. We had also had some issues with our p&p placing the parts to hard and smashing out paste causing a bead to form in the middle of our 0805 packages.
Electronics Forum | Mon Jul 28 06:13:35 EDT 2008 | cobar
Your problem is being caused by to much paste being printed.Reduce apeture size on stencil. http://www.shanelo.co.za/technical_paper_about_stencil_de.htm or http://www.shanelo.co.za/SMD%20Assist.htm
Electronics Forum | Mon Jul 28 13:08:28 EDT 2008 | gabriella
Hello everyone, thanks for the feedback. Now I am sure it is too much solder paste. It seems that the pads are a little bit bigger than they should be, so I will probably need an aperture reduction more than 10%.
Electronics Forum | Wed Nov 13 12:06:53 EST 2019 | slthomas
The answer is usually either too much paste or paste being deposited where it doesn't belong. In some instances the two are related. You don't say what kind of parts you're having problems with and that matters too. I agree with the previous poste
