Electronics Forum | Wed Apr 23 17:28:46 EDT 2008 | davef
The need to prebake boards to remove moisture from the board [to prevent voiding] prior to wave soldering is driven by the thickness of through hole plating. * 1 thou [25um] or greater requires no prebaking * LT 1 thou [25um] requires prebaking
Electronics Forum | Sat Apr 26 08:18:47 EDT 2008 | davef
Your warpage problem could be caused by change in: * Multilayer board construction (not homogeneous or unbalanced - too resin rich or poor) * Supplier process capabilities (lamination cycles) * Material selections (usually cheap and dirty), etc.
Electronics Forum | Tue Apr 29 02:08:21 EDT 2008 | sin4d
Hi, I am also facing the same probelm. I assembly a substrate with a thickness of 0.30mm and the board warp after reflow. If I bake the substrate at 125 Deg C for 2 hours will it help to solve this problem? Thanks
Electronics Forum | Tue Apr 29 07:26:38 EDT 2008 | realchunks
Another area to look is on any breakaway. If they did not add copper to breakaway, it can warp your board if long enough. Seen it happen many times.
Electronics Forum | Mon May 05 15:52:22 EDT 2008 | dekhead
Assuming you have the scale that corresponds with Board Width for center justified stencil. Formula would be: 2 x (distance to image {mm} - 368) = Board Width (setting on scale) http://www.dekhead.com/
Electronics Forum | Thu Jul 17 17:20:39 EDT 2008 | steveliu
The screen we had is a Planar EL7768MS. There is a small DC/DC power supply board attahced to the back of the touch screen. That PS board was toasted and caused the failure of the screen. Steve
Electronics Forum | Thu Jul 17 07:58:10 EDT 2008 | mmjm_1099
We have no issues with National Technology. Here is the email: sales@nationaltech.com and contact number (847) 506-1300. I am in no way associated with them but we purchase from them constantly and good quailty. I believe they manufacturer a good per
Electronics Forum | Mon Jul 28 10:17:59 EDT 2008 | davef
Most of us are more interested in building boards than designing them. Having said that we'd like to help. Start here: * http://www.hobbyprojects.com/ * http://www.eskimo.com/~billb/amateur/elehob.html * http://www.electronic-circuits-diagrams.com/
Electronics Forum | Wed Jul 30 02:50:10 EDT 2008 | omid_juve
Thanks do we have any software for measuring the standard cost for assembling a board according to the processes that it needs?
Electronics Forum | Tue Aug 26 09:29:03 EDT 2008 | wavemasterlarry
Good job I normally swap boards betwen machins to veify what board is burnt up or bad, That is if you have two similar machines.
