Electronics Forum | Fri Apr 15 16:02:26 EDT 2005 | jdengler
ING, If my memory is correct: -This is from the large air cylinder below the X/Y table moving slow or not getting down all of the way. -The air cylinder has a sensor for when it's down all of the way. - This sensor could be bad but most of the t
Electronics Forum | Sat Mar 14 15:48:40 EDT 2015 | horchak
The white haze is definitely an indication of moisture being trapped in uncured or improperly applied solder mask. You can verify this by heating up the board using a heat gun on an area of the board with the white haze, and if it clears up that is t
Electronics Forum | Mon Nov 26 20:15:50 EST 2001 | davef
Sounds like you are thinking correctly. I'd guess your fab has gotten "smart" and changed your bare board, as you suggest. So, you've got two choices: 1 Rework the QFP. 2 Remove the lower temperature PTH components and solder them to the board some
Electronics Forum | Fri Jun 14 02:13:11 EDT 2002 | john_wsme
Ross, Thanks for your advice. I will take a look at FAB warp and check the pad size. If you also have any suggestions on rework BGA profile, please share some information which is a great help for us. The best regards, John Need help from everybod
Electronics Forum | Mon Feb 02 11:52:07 EST 2009 | pjc
Is anybody using H2O washable solder mask that comes on the PWBs you get from the fab vendor? I am researching PWB vendors that can provide this service. Thanks.
Electronics Forum | Mon Feb 02 16:56:17 EST 2009 | pjc
Thanks Dave. I did find one PWB fab that does offer it pre-applied to the boards, Saturn PCB. I'm told the formula is proprietary but is WS. Not sure if its CL friendly though.
Electronics Forum | Fri Mar 24 17:07:39 EST 2000 | John Thorup
Hello Ashok If you are talking about the thousands of volts that is often generated by either simply unrolling the tape to apply or when it is removed from the board after soldering you don't have a lot of choice since it is an insulator. Ionization
Electronics Forum | Thu Jun 14 21:20:23 EDT 2001 | davef
Aw, don't be such a baby!!! ;-) It's a blank of a lot cheaper than ENIG. Costs about the same as HASL, maybe even cheaper. Why not have your fab build-up a split a lot [er, maybe build a few extra, whatever.] next time you order your "favorite" b
Electronics Forum | Mon May 18 13:18:25 EDT 1998 | Chrys
I'm reviewing my board fab spec. It calls for a minimum SnPb thickness of 50 microinches on HASL PWB's. I've looked at other specs that call out anything from 30 to 80 microinches, and others that just say the copper pad must be covered and soldera
Electronics Forum | Fri Jun 14 18:01:04 EDT 2002 | john_wsme
Dave and Russ, Today we modified the profile to ramp up slowly and have longer preheat time. The result is great, 0 out of 5 without bridging. I did review the FAB design and seen the pad is much biger than ball size. So I guess it is the problem.
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