Electronics Forum | Mon May 18 16:14:55 EDT 2009 | thenrz
Yes! That's exactly what we need. If there's no difference between v2.xx and v4, I'd much appreciate some help!
Electronics Forum | Wed Jan 13 13:46:53 EST 2010 | cyber_wolf
Can anyone provide us with some input on these machines? How well do they handle warped boards..changeover..programming..etc..
Electronics Forum | Thu Jul 01 11:48:10 EDT 2010 | mb_mfg
Sid, Try baking the boards before running, to insure no moisture. Baking out the moisture will help prevent warping. Should you need further assistance, we supply fixtures to force the board to stay flat to reduce to thermo shock during wave solde
Electronics Forum | Fri Jul 16 11:27:57 EDT 2010 | davef
Consider: * Bow & Twist IPC-TM-650; Method 2.4.22 * Previous threads on SMTnet, like: http://www.smtnet.com/Forums/Index.cfm?CFApp=1&Message_ID=54498
Electronics Forum | Fri Jul 16 17:39:33 EDT 2010 | deanm
It is a PCB design issue where the copper patterns are not balanced among the layers. Baking the boards in order to correct the warpage will not improve it. We've had a problem with one bare board in particular warping the same way from two differen
Electronics Forum | Tue Jul 20 16:02:12 EDT 2010 | mikesewell
You may want to look at IPC 7721 Method 3.2 Bow and Twist Repair. In extreme cases you may need clamp or weight the pcb with bow in the other direction to yield a "flat" pcb in the unrestrained state. You will have to take the PCB up to or slightly
Electronics Forum | Wed Jul 28 08:41:47 EDT 2010 | vetteboy86
I believe we are seeing some wetting issues as we have tried to bake these assemblies ourselves. Our PCB supplier is coming in next week to address the issue. Is there a rule of thumb or formula for determining correct parameters. Thanks
Electronics Forum | Tue Jan 04 16:06:13 EST 2011 | davef
To get started, here's a recent thread about board warp: http://www.smtnet.com/Forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=15249&mc=7
Electronics Forum | Mon Jun 13 01:35:22 EDT 2011 | kenneth0
Had you check the temperature difference of outer balls and inner balls? Solder short in corners might be caused by high delta T causing BGA warping.
Electronics Forum | Mon Sep 17 06:11:41 EDT 2012 | kq702
Hi I did a reflow on a laptop board and after the reflow the board is warped in the area I did the reflow in, and now the laptop screen does not turn on at all when I put it back into the laptop. Original problem was the wifi (I did the reflow more o
