Electronics Forum | Wed Sep 05 17:37:56 EDT 2001 | seand
Hello Jeff, If you have components on your board be careful of how low the frequency is that you will be applying to your board. Ultrasonics are great for cleaning stencils and bare boards at around 40kHz. These frequencies (and Lower)may however
Electronics Forum | Tue Aug 30 15:05:23 EDT 2005 | Shean Dalton
Dear Ing, Have you analyzed why some RF device aren't operational after washing? An assumption is that failures are related to the ultrasonic energy applied. Other possibilities are for poor rinsing, poor drying, inadequate washing on those failed
Electronics Forum | Wed Nov 03 21:17:40 EST 1999 | Doug B.
Yes this is absolutely true. No-clean flux residue has various affects on the functionality of circuitry especially high impedance circuits. It also affects solderability, and reliability. No-clean flux will always leave a detectable residue. Mos
Electronics Forum | Wed Jan 03 10:56:46 EST 2001 | Mike Konrad
Hi Dave, Water soluble flux has two opposite attributes. #1: It is the easiest flux to remove. #2: It is the worst flux to leave behind on a board. As for # 1, there are many de-fluxing systems out there that are very capable of removing water
Electronics Forum | Fri Dec 01 14:12:50 EST 2000 | Jim M.
My company currently uses water soluble paste for our SMT process. We were having trouble retaining hot water in our in line, closed loop DI cleaner. The cleaner kept shutting down when the water temp. dropped below 125C. As a result, the conveyor
Electronics Forum | Fri Nov 03 15:43:20 EDT 2017 | dleeper
IPA and DI water are both very common and effective methods of cleaning PCBAs. http://www.zestron.com/sa/cleaning-applications/smt-electronic-cleaning/pcba-cleaning/aqueous-cleaning.html http://blog.gotopac.com/2010/11/18/ipa-as-a-universal-cleaner
Electronics Forum | Fri Dec 01 15:37:50 EST 2000 | Dason C
Jim, you may need to look with different paste instead of the cleaning solvent. Please advise what is the paste which you currently using? Beside, when you talking about the board stayed in hot area, is it a drying area or the cleaning zone. If it
Electronics Forum | Fri Dec 01 16:02:33 EST 2000 | Jim M
Thanks for your reply. I 've tried to clarify and answer your questions. The water soluble paste used is WS3060, type 4. The boards are sent through a inline di cleaner after reflow. There is a hot Di waterwash, rinse and then hot air to dry the wa
Electronics Forum | Thu Feb 28 14:27:07 EST 2008 | cyber_wolf
The flux dries out and the paste sticks in the stencil apertures. As the flux dries it also causes the solder to oxidize. Hahaha ! I remember adding flux to paste back in the day to loosen it up. Do not do it ! I have been told by reputable industry
Electronics Forum | Mon Dec 09 21:00:39 EST 2019 | sssamw
Did you solve this issue? It doesn't much look like the flux dried out, ti should be across whole board and has much more same defect if flux dried out. Did you have failure ratio data to show the defect location, for example 10% at location A on bo
