Electronics Forum | Fri Apr 01 02:56:18 EDT 2011 | grahamcooper22
the cause could be moisture in your pcbs. To check it...pass some bare pcbs through your reflow oven (this is a simple way of drying them out a bit), then paste and place and reflow as normal....if solder beads disappear then the pcbs have too much m
Electronics Forum | Wed Apr 06 04:18:03 EDT 2011 | emmanueldavid
TK, Hope you got it right only for this round of assemblies. Well, passing through a Reflow belt is not an ultimate process to dry circuit cards & take out moisture from Solder finished layers. First of all, if the packs were not unsealed (even s
Electronics Forum | Sat Aug 07 11:14:19 EDT 1999 | JohnW
| | Mike, | | | | Got your message and those of others concerning PCB fab supplier evaluation and qualification check lists, etc. I have a severe problem here in WI as I can hardly access the internet, and when I do it is cut off abruptly for no goo
Electronics Forum | Sat Aug 07 22:16:16 EDT 1999 | Earl Moon
| | | Mike, | | | | | | Got your message and those of others concerning PCB fab supplier evaluation and qualification check lists, etc. I have a severe problem here in WI as I can hardly access the internet, and when I do it is cut off abruptly for
Electronics Forum | Tue May 30 21:09:30 EDT 2000 | Dave F
Dennis: Direct metalization is more of an European phenomena than a US one. Not to say that good things don�t come out of Europe. As background: Direct Metallization. In circuit board fabrication, an alternative to electroless plating makes the
Electronics Forum | Fri Jul 21 15:26:59 EDT 2000 | Boca
You're going in the direction of fab improvement, a great direction. But in another direction; If you're already in a carrier, how about using a skyhook of some sort to support the middle of the fab from the top side? In some cases you can put fine
Electronics Forum | Fri Feb 11 05:44:08 EST 2000 | Dean
Sounds like black pad to me. I just suffered this last week. Track your fab lot codes. Just in case. I processed 1000 fabs of 2 lot codes through 1 line (also WS609). 1 lot code failed with black pad the other did not. With one common mfg. proc
Electronics Forum | Wed Jul 12 16:33:39 EDT 2000 | Mark Charlton
We just went through a difficult time processing SMT immersion white tins PCA's and found the following: 1. FAB vendor had a degraded tin solution resulting in improper plating thickness 2. FAB vendor was not using the proper cleaning process Get
Electronics Forum | Mon Nov 06 16:27:48 EST 2000 | Boca
Bingo! Sounds like you solved your mystery. You've checked your key process steps, the product has been running in your processes for some time with no process changes. This all points back to one of your process input, i.e. the fab. Experience s
Electronics Forum | Sat May 06 08:00:52 EDT 2000 | Dave F
Rashad: Very evocative title for the thread. There is tons of stuff on the net on board fab. For instance: * Earl Moon wrote some outstanding articles on fab in the SMTnet newsletter ..., before they chased him away. Earl (that ol' fart) know m
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