Electronics Forum | Wed Nov 10 19:44:13 EST 1999 | Charley Qin
Hi, Dave Which brand of solder paste are you using? Is it Alphametal UP78 family? If so. According to our experience, you could try other solder pastes without any change on stencil aperture. Maybe it could work. Good luck.
Electronics Forum | Thu Apr 22 11:44:30 EDT 1999 | Chrys Shea
| I would like to known what�s MESH SIZE mean in the solder paste specification ? | | Check out the thread from 4/14/99 on solder FINES vs. solder balls. The info you're looking for is in there.
Electronics Forum | Fri Apr 23 12:09:47 EDT 1999 | JJA
| | I would like to known what�s MESH SIZE mean in the solder paste specification ? | | | | | Check out the thread from 4/14/99 on solder FINES vs. solder balls. The info you're looking for is in there. | test
Electronics Forum | Mon Sep 24 20:33:34 EDT 2001 | davef
Assuming you're seeing this during wave solder, the via acts like a heat pipe conducting 450�F [or whatever] air to your solder balls. Check the fine SMTnet Archives for similar threads and perspective on the direction to take.
Electronics Forum | Tue Jun 04 15:52:44 EDT 2002 | Hussman69
Closed by solder mask? At any rate, still sounds like wave solder. Take a look before and after wave. That should tell ya.
Electronics Forum | Thu Aug 01 06:09:01 EDT 2002 | mzaboogie
Hi Pete, The boards are HASL. The frequency is random. The solder balls are randomly deposited along the path of the select wave, not always along the component bodies. We are very careful regarding handling. There could have been contamination on s
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 Apr 03 13:28:11 EDT 2012 | davef
Is this related to this specific machine or this product? * Is this machine having a tough time regulating pot temperature? * Is this product dragging-out solder from the pot when it is being run so quickly? * Is this board out-gassing to create thes
Electronics Forum | Mon Sep 30 09:26:04 EDT 2002 | itempea
Russ, first step would be to get IPC-7095 on BGAs. A few notes: There can be voids in solder balls, or at the solder joints to the BGA, or at the solder joints to the PCB. Various sources or reasons can be responsible for these voids. Voids can be
Electronics Forum | Wed Dec 09 10:02:10 EST 1998 | Earl Moon
| Does anybody out there have any special insights into utilizing no clean paste in high frequency RF applications? I would imagine there may be some issues with solder balls that would affect functional test (Earl, do you have something for me here?
