Electronics Forum | Wed Sep 01 08:16:55 EDT 2010 | sachu_70
Drill holes or tooling holes have higher tolerances than Fiducial marks during PCB fabrication. I would certainly recommend Fiducial recognition as a more reliable approach for better accuracy. You could re-calibrate the Vision system file used for
Electronics Forum | Tue Dec 07 10:57:29 EST 2010 | davef
Warpage tells you that design and/or fabrication process and/or assembly process need[s] to be corrected. Here's a link to a recent thread on SMTnet that seems to answer some of your questions: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_I
Electronics Forum | Thu Jan 06 09:31:39 EST 2011 | davem
Hey Guys, I'm interested in installing a new drip pan under our Trek Westek Triton IV Aqueous Cleaner. I'm looking for a fabricator in the Greater Boston/North Shore Massachusetts area. We haven't yet decided on stainless or plastic. Any suggestio
Electronics Forum | Wed May 25 21:03:30 EDT 2011 | thanhnguyen22
Hi All, I am new the PCBA process fabrication. I have found many cracks in the PCB after we have cross sections analysis. The cracking has same kind of pattern. It happens betwen the solder and the PCB, or between the solder and the part, BUT not be
Electronics Forum | Mon Jun 13 12:58:10 EDT 2011 | deanm
We find it is a bigger issue in the summer when there is more humidity in the air even though our facility is air conditioned. We've also seen similar boards go through the same process and vendor A has problems and vendor B doesn't, so fabrication t
Electronics Forum | Fri Jul 08 10:21:21 EDT 2011 | davef
OK. You used a thermometer to to check your recipe. How do know that the temperatures that you selected are correct? Your solder balls indicates that it's possible that the temperatures that you selected might not be correct. Without belaboring an
Electronics Forum | Sat Aug 27 09:17:17 EDT 2011 | davef
We assume from the way you wrote the posting that we're talking about bare boards delivered from your fabricator. If that's the case, the best way to clean these boards is to tell your supplier to clean the boards before sending them to you. You shou
Electronics Forum | Thu Oct 13 18:00:01 EDT 2011 | spitkis2
>We put paste on the board at SMT to solder them on initially. Then not when they get reworked? When assembling the board, solder paste is applied to the BGA and all other SMT pads since the stencil was fabricated with those openings. If the openin
Electronics Forum | Tue Jun 12 15:12:47 EDT 2012 | tanderson
We clean (using a pencil eraser) the fiducials on all our PCBs before processing them through a QUAD QSP-2. We're discussing pcb's with our fabricator to see if they have recommendations. Some of our Engineers believe it is the QUAD that's the proble
Electronics Forum | Wed Jul 04 12:18:14 EDT 2012 | davef
Phil is correct in his description of proper rework technique. Possible explanations of the reason for popping of your BGA are: * Thermal cycling of components cause them to flex on a different point in the cycle that the board possibly resulting in
