Electronics Forum | Thu Jan 13 17:46:04 EST 2011 | davef
We've never seen the defect that you describe, but in wave soldering-land blowholes usually are caused by moisture in the board that out-gasses through the too thin plating of through holes. * Bandaid fix: bake the boards * Long-term fix: Obtain boar
Electronics Forum | Fri Feb 23 14:51:48 EST 2024 | carl_p
Just another thought - how long is the printer idle for between boards? is it long enough to have the chemicals start to separate within the paste?
Electronics Forum | Fri Jan 23 07:20:12 EST 1998 | Chris Chorley
What is the lifetime for a typical solder paste ? How long can boards be stacked waiting before the paste goes off ?
Electronics Forum | Thu Oct 20 23:19:09 EDT 2005 | Cmiller
You should not be worried about these points in the SMEMA standard. You need to make it work for your application. If you are running really small boards, keep the gap between conveyors and the lead-in as tight as you can. If you are using large pane
Electronics Forum | Mon Feb 04 07:43:02 EST 2008 | davef
Bruce: We know Arun is not cleaning the board properly. Arun does not know how to determine if the board is clean. Arun doesn't know how long to clean the board. Apparently, you do. Tell Arun the answers.
Electronics Forum | Sat Dec 18 08:23:33 EST 2010 | remullis
I experienced warpage on a 7'x 13" long board, unfortunately my oven does not have center support. I use stiffeners on both of the short ends. It fixed my problem. Some of the things I was experiencing with the warpage on the second pass were placem
Electronics Forum | Fri Mar 21 11:10:24 EST 2003 | davef
There is no standard. If your boards solder well, they're good. Well soldered boards that have been stored a long time will have field life similar to well soldered boards that have not been stored a long time. The solderability of boards depends
Electronics Forum | Fri Jul 28 14:34:13 EDT 2000 | Gary Simbulan
Belive it or not, these boards were run through a Centech batch mode Vapor Phase machine. Single stage top side IR preheat. Vapor temp 218 C. Solder paste is an SN62 RMA.The boards were FR4 8 layer w/ solder mask, fairly conventional as might be e
Electronics Forum | Fri Dec 16 10:45:41 EST 2005 | campos
Hi,, My doubt is regarding to the Reflow Time, I mean, in a 5 or 7 zones oves, how long the board should stay inside the oven to complete the soldering cycle? 4 min, more, less...Should I keep low temp until peak for a long time or high temp in shor
Electronics Forum | Thu Jan 16 16:15:27 EST 2003 | billg2753
I have received a few boxes of fully assembled boards that have damaged packaging boxes due to rain water. There is visible moisture inside the ESD bag. I have no idea how long these boards have been exposed to moisture. Does anyone have a procedure
