Electronics Forum | Sat Jan 19 02:29:11 EST 2002 | ianchan
Thanks for the tips... found out the ex-employee guy, had pre-bake conditioning put into the process flow, as this pcb is made of polymide material, that is reputed to have historical patterns in thermal sensitivity. To avoid "thermal damaging" the
Electronics Forum | Mon Jun 28 14:30:46 EDT 2004 | davef
There multiple potental causes of BGA curling during reflow. One of them is moisture inclusion in the part, as Francois mentiones above in this thread. Another has to do with the construction of a BGA. So, from our perspective, more often the mois
Electronics Forum | Mon Jun 28 09:15:21 EDT 2004 | jdumont
Morning all, we have been seeing some problems with the edges of some of our BGA's curling away from the PCB after reflow. Is this possibly a moisture problem? If so what would be a good time/temp to bake them at to rectify the problem? Thanks in
Electronics Forum | Thu Jan 17 20:33:05 EST 2002 | ianchan
Hi, Can anyone help explain the benefits/disadvantages of bareboard pcb baking, as part of the pre-heat conditioning, before the bareboard pcb use in SMT production run? The pcb board is 200mm x 240mm panelized pcb board, and has 28 smaller pcb boa
Electronics Forum | Mon Jun 28 15:03:43 EDT 2004 | jdumont
If you dont mind me asking, what are you guys using to keep your IC's dry??
Electronics Forum | Mon Jun 28 15:11:29 EDT 2004 | davef
McDry seems be a good unit to consider.
Electronics Forum | Fri Jan 18 04:45:32 EST 2002 | wbu
Ianchan, baking as being part of pre-heating is obviously sensless cause the PCB will not maintain any of that heat till soldering. Common reason for prebaking PCB�s is getting the moisture out to prevent outgassing, warpage and maybe other defects.
Electronics Forum | Mon Jun 28 10:04:41 EDT 2004 | jdumont
Yes please send a copy of that paper as I dont have access to the 033 STD. That would be great, thanks a lot. jdumont@astromed.com JD
Electronics Forum | Mon Jun 28 14:45:50 EDT 2004 | davef
JDumont: In trying to find the paper that Francois referenced, poke around his site [ http://www.cogiscan.com ], where he's collected a bunch of papers on the control of moisture sensitivity in components.
Electronics Forum | Mon Jun 28 15:27:33 EDT 2004 | davef
Oh, you posted something about that a couple of weeks ago. Nice that you have the justification, too bad that's the way you needed to get it.
.gif)
