Electronics Forum | Mon Oct 31 19:37:16 EDT 2022 | emeto
Just because you can't add copper to the board, doesn't mean you can't add copper to the panel. Redesign panel, where board house can add copper to the panel to balance the board a little better. I would advise against low melting solder alloys on cu
Electronics Forum | Wed Nov 14 20:28:24 EST 2001 | davef
Not to worry. Just run the boards through the cleaner. It will remove all the solder balls. The gross filter on your washer will collect all the solder balls. Coo eh? ;-) How to cure SM? Is your mask UV, er thermal? After learning the type, you
Electronics Forum | Sun Jul 24 16:10:16 EDT 2011 | davef
As a shot in the dark response to a hopelessly vague question .... Back in the old days, we'd see corrosion of metal parts after DI water washing when our water was on the high-end of the resistivity range, usually after we received fresh tanks from
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
Electronics Forum | Fri Dec 08 18:37:01 EST 2000 | Dave F
Asymetry in heating or mechanical forces are the primary reasons for tombstoning regardless of the reflow method. [There's beaucoup of background in the fine SMTnet Archive on reflow tomstoning.] Your situation is curious, but at least you know why
Electronics Forum | Tue Aug 22 14:52:55 EDT 2000 | John Thorup
Jax - absolutely right - the archives are a valuable tool and deserve to be used more than they seem to be. Caumel - Are your blobs on the solder side or the component side? Are your vias tented on the component side? What size are your vias? Is th
Electronics Forum | Thu Jan 23 15:56:51 EST 2003 | MA/NY DDave
Hi Well I can't argue too much with MikeKonrad, whom I might know, yet maybe don't. The only other reason that you can be a little sloppy is if your product application or life cycle won't allow the corrosive cycle during usage to become a problem.
Electronics Forum | Thu May 11 17:28:40 EDT 2006 | bradlanger
Steve, We have had the same problem at my company and unfortunately I do not have any good news for you. We are using a pizza slicer type depanalizer from FKN and if the MLCC caps are layed out too close to the edge they still break. We had to add th
Electronics Forum | Wed Aug 02 17:39:54 EDT 2006 | russ
Well i guess you would not have to dry the boards but let me ask this, Are you hand cleaning water soluble flux in a sink? Never seen a cleaner without a dryer. Anyway temp and time for drying is easy to figure out. When boards are dry you have i
Electronics Forum | Thu Dec 04 00:22:11 EST 2008 | maacolomer
Hi Steven, The 24 hrs bake is an overkill according with various J-STDs. Assuming a bake temperature over the 100 Celsius degrees. There are several factors to be considered before deciding the best methodology to wash misprinted board. However,
