Electronics Forum | Wed Aug 17 13:57:27 EDT 2005 | ppwlee
We have encountered what appears to be mask discoloration after wave soldering. The areas of concern coincide with the areas that were exposed selectively by fixtures during wave soldering, dominated by one date code of PCB with a slightly different
Electronics Forum | Wed Aug 17 22:41:37 EDT 2005 | davef
Peter are you having fun with solder masks erwat? We saw this years ago with LPI solder masks. It shows occasionally with other masks. We agree with Russ. If nothing [eg, alcohol, flux thinner, acetonitrile, or water] dissolves the haze, then it
Electronics Forum | Wed Aug 17 14:30:58 EDT 2005 | russ
I usually see this with mask that is not fully cured from the PCB shop. This probably agrees with the baking statement that you made.
Electronics Forum | Thu Jul 12 20:53:59 EDT 2001 | davef
Hussman: Please help us understand how knowing the profile will point us in the direction of how solder got under solder mask.
Electronics Forum | Thu Jul 05 21:42:28 EDT 2001 | davef
Most of our boards are fabricated with solder mask over bare copper [SMOBC], but we have couple where the solder isn't removed before masking. And ever so offin they's a liddy bit mo' solder than we'd like, which when reflowed, ends-up connecting so
Electronics Forum | Fri Jul 06 18:19:41 EDT 2001 | davef
The senior staff have the pictures!!! Oh, that�s just GREAT!!! What the blank are these gerbils doing with �em? Nothin�!!! They�re probably sitting in a folder on whatzisname�s desk, until he has "a change to study them more". [Like he�s going t
Electronics Forum | Fri Jul 06 00:22:49 EDT 2001 | DL
Thanks Dave, and yes we can leave the solder there in this instance. These panels, 12up, are NCMR from the customer. The customer is saying that after the panels have been reflowed 5 times! solder starts to accumulate under the mask. Get this, My sen
Electronics Forum | Mon Jul 16 08:56:56 EDT 2001 | Hussman
Easy, DL says the customer is telling him after 5 reflow processes they get solder under the mask. He tried it and didn't see anything. DL needs more information to understand why and where this is occurring. So, if he can't duplicate the problem
Electronics Forum | Thu Jul 05 20:30:00 EDT 2001 | dlkearns1
I've never seen this and was wondering how bad is this? We've tried to re-create this defect, but could not. Comments????????
Electronics Forum | Thu Jul 12 10:45:42 EDT 2001 | Hussman
Since your customer is complaining, you'd better be pro-active. Doesn't mean they're right, but without customers, life sux alittle. Anyway, ask them for a profile of the 5 reflow processes. If they don't have that and you have a profiler, ask if
