Electronics Forum | Tue Aug 17 16:07:23 EDT 2010 | scottp
Are you controlling humidity in your plant? I'm not familiar with that particular paste, but some pastes are sensitive to a humid environment. We also had one paste supplier send us a batch that had excessive solder balls if the boards were printed
Electronics Forum | Fri Sep 20 14:06:27 EDT 2013 | jorge_quijano
We were doing the same a few months ago, it took us 1 shift with 2 persons to drain it (we were repairing a leak), we were disconecting the resistors once they were not in contact with molten solder to prevent overheating... Here you have a pic of t
Electronics Forum | Thu Apr 05 22:24:32 EDT 2001 | davef
I think your solder mask is a partial cause of your solder balling. Additionally, adjusting some machine set-up parameters may also help. 1 If we were talking about a single assembly problem, we�d be thinking about the laminate, but since you say t
Electronics Forum | Wed Aug 10 16:37:35 EDT 2011 | davef
Yes, there are ways to machine process boards like this. The devil is in the detail. In no particular order, your choices are: Process flow #1: * Print chipbonder on the surface mount side for SMT parts * Mount SMT components * Cure adhesive, if r
Electronics Forum | Wed Sep 08 17:28:11 EDT 1999 | Earl Moon
| | Has anybody have any experience with Top placement of BGA's. GLue descretes on bottom and then wavesolder.? | | | | | | | Hi Chris, | Why don't you process a double side reflow and use selective wave fixture for wave process. The process w
Electronics Forum | Wed Jun 24 14:20:53 EDT 1998 | Ben Salisbury
I know this topic has probably been talked about before...But I ran into a small situation where Solder Balls were appearing in large quantities on the PCB....the Problem has been isolated and taken care of, my question is, what are some good methods
Electronics Forum | Thu Oct 03 04:04:10 EDT 2002 | Bob Willis
SMTNet has a video tape and interactive CD ROM on Intrusive Reflow Soldering that you may want to check out. In addition there are some free inspection standards for pin in hole printing, placement and soldering available at http://www.dpmo-monitori
Electronics Forum | Wed Dec 18 08:19:00 EST 2002 | cyber_wolf
One thing that will also cause this is very slight stencil mis-alignment. Sometimes the paste will have a tendency to hang up in the apertures if you are over hanging just a little on the solder mask. Some solder mask are very slick and will not pull
Electronics Forum | Wed May 25 17:29:58 EDT 2005 | Peter
We are evaluating a low halide Water soldering flux (Aim WS716). Has anyone had good/bad experience with it? Our operator has mentioned strong and irrating smell, even when standing a foot away from the conveyor entry/exit. The fluxer is embedded w
Electronics Forum | Thu Aug 25 08:26:48 EDT 2005 | DannyJ
Hi MM, Off the cuff, is it possible that the QFP leads were not coated? I'm by no means an expert in QFP manufacturing, but I do believe that there is a coating which enables solderability that is added to the leads somewhere in the process. I ha
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