Electronics Forum | Thu Oct 02 08:26:41 EDT 2008 | rway
We had similar issues until we went to a 6 mil stencil thickness.
Electronics Forum | Mon Sep 29 14:47:15 EDT 2008 | davef
Let's narrow this down. Questions are: * Are you putting the proper amount of solder in the board with your stencil print process? * If you are putting the proper amount of solder in the board, where is the solder going? Pick one and then fill-in th
Electronics Forum | Mon Sep 29 11:44:39 EDT 2008 | manishc
We r facing less soder problem with qfp,using 4 mil tencil and lead free paste,tried out different combinations of reflow profile,can anybody suggest?
Electronics Forum | Tue Sep 30 14:06:04 EDT 2008 | realchunks
What pitch? You can go 5 mil or even 6 mil stencils depending on your screen printer. Also what do you consider "less solder"? What defect are you having. Remember on a QFP you use the heel filet to determine proper solder joint - not the toe.
Electronics Forum | Mon Sep 08 20:55:04 EDT 2008 | davef
Of the six pads in the picture, which are the two that are unacceptable?
Electronics Forum | Tue Sep 09 07:42:25 EDT 2008 | wavemasterlarry
God..... give it a rest.
Electronics Forum | Wed Sep 10 16:12:57 EDT 2008 | vladig
And doing analysis you are NOT changing things. Vlad
Electronics Forum | Thu Sep 11 11:27:41 EDT 2008 | rarnold
YES! Reflow Profile knobs have been verified.
Electronics Forum | Sat Sep 06 10:09:57 EDT 2008 | davef
We can't help but wonder: * What are the measured temperatures on a good solder connection and the picture connection? * Why use use Type 4 solder paste?
Electronics Forum | Wed Sep 10 09:34:25 EDT 2008 | realchunks
In the real world where I work, I turn knobs (really key boards, mouse, or touch screens) every day to solve solder related problems. I can tell you exactly why I have to for each one I adjust.
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