Electronics Forum | Tue Jun 09 07:35:23 EDT 1998 | Steve Gregory
Hi there Gary, Your solder ball problem is very similar the problem I experienced, but I was using a water soluble paste at the time. It started by inspectors telling me that they were seeing cold solder on some SIMM's that we had built regularly. W
Electronics Forum | Tue Jun 09 15:46:29 EDT 1998 | Aric Parr
| Hi there Gary, | Your solder ball problem is very similar the problem I experienced, but I was using a water soluble paste at the time. It started by inspectors telling me that they were seeing cold solder on some SIMM's that we had built regularly
Electronics Forum | Tue Aug 31 21:45:49 EDT 2004 | KEN
I have experienced this directly in SMT and wave solder. Fillet lift (can) be a direct indicator to lead enrichment (but its not the exclusive symptom). Lead enrichment in smt joints reduces the interfacial strength shortening the time to creep f
Electronics Forum | Thu Apr 19 20:01:30 EDT 2012 | eadthem
some things to consider, Is there flux on the board. are there finger prints on the tops of parts. Is the board warped at the V score from reflow Is the board shifting in the machine during inspection. These are the issues we have had with our mir
Electronics Forum | Fri Apr 20 14:11:27 EDT 2012 | rway
Programming is different, yes, but so is the terminology. ///with machine vision you have parameters that select what is good and what is bad, and you have parameters that help make bad look worse and good look better making the difference between w
Electronics Forum | Thu Sep 19 11:14:45 EDT 2002 | Jim M.
We had lots of problems with bridging on 15.8mm pitch, QFP17-160 at the start.The board was .032 thick, double sided-six boards to a panel. Here is the problems (not neccessarily in the biggest to little but as i remember them) and solutions that he
Electronics Forum | Wed May 27 14:35:52 EDT 1998 | Justin Medernach
| | R&D is currently designing a board with smt components on both sides of the board. They are adding a 16 pin IC Gull wing. on the bottom side of the board. I have asked for only caps and resistors to be placed on the bottom side. Is there a recomm
Electronics Forum | Wed May 27 13:42:08 EDT 1998 | Chrys
| R&D is currently designing a board with smt components on both sides of the board. They are adding a 16 pin IC Gull wing. on the bottom side of the board. I have asked for only caps and resistors to be placed on the bottom side. Is there a recommen
Electronics Forum | Thu Jul 03 03:23:04 EDT 2003 | loz
I have been advised recently about pcb manufacturers, that somehow or other supply pcb's with contamination. Visually they are fine, but problems arise during SMT manufacture, ie solder balling, non-wetting on pads, and also during wave solder proces
Electronics Forum | Tue Sep 07 09:11:33 EDT 1999 | Dave F
| We've noticed that there are many different recommendations for pad sizes for various SMT parts. This seems to vary wildly from manufacturer to manufacturer for the same case sizes. Is there any standards that can used used to specify these sizes
