Electronics Forum | Wed Sep 29 09:29:47 EDT 2010 | swag
Take a few parts from the reel and look close at the parts to make sure the bottom surface of the leads is below the bottom surface of the body.
Electronics Forum | Wed Sep 29 08:26:03 EDT 2010 | babe7362000
We are Currently running a Board and it seems that the SOT-223's on the bottom side have flux and water trapped under the part. Nothing has changed in our process and this is the only board that it is happening on. We are using Kester R562 water wa
Electronics Forum | Thu Sep 30 11:30:46 EDT 2010 | babe7362000
Take a few parts from the reel and look close at > the parts to make sure the bottom surface of the > leads is below the bottom surface of the body. Yes I did that and they are below the body. I found the problem I think. The solder mask is abo
Electronics Forum | Mon Mar 21 08:19:54 EST 2005 | Bob
Sounds like a flaw in your trap. It seams that during the pumping process the trap is ineffective or open, allowing normal sewer gases to bypass the trap and stink up your SMT area. This is similar to what happens when you do not use a drain for a lo
Electronics Forum | Mon Mar 21 21:28:41 EST 2005 | pmd
I agree with dave. Two things prevent oders from drains. The "P" trap and the celing or roof vent. If the system is sealed from the pump on then it should run thru a "P" trap this prevents vapors from comeing back thru the pipe. To make sure suction
Electronics Forum | Mon Mar 21 08:25:11 EST 2005 | cyber_wolf
No it's not a dry or defective trap. The exit line of the stencil sink is piped into a regular slop sink. There are no sewer gas smells coming out of the slop sink trap.
Electronics Forum | Wed Apr 04 16:54:58 EDT 2007 | pjc
Maybe more baking time is needed. Topside board temp too low. Moisture trapped in board. Top of through hole capped by component and trapping flux. http://www.speedlinetech.com/electrovert/electrovert-troubleshooting/index.htm
Electronics Forum | Fri Apr 12 15:15:12 EDT 2002 | jsherrow
Water trapped under the PLCC (in the socket)during the wash was our reason for installing at final assembly.
Electronics Forum | Fri May 16 09:37:43 EDT 2003 | russ
Could we be seeing trapped water or flux underneath the BGAs? Russ
Electronics Forum | Wed Jan 05 12:48:44 EST 2000 | Dave F
Millerin: You are generally correct about plugging and over plating vias, but in Michaels case, the via is blind. Plugging would trap air between the bottom of the via and the plug material, causing an air pocket. When heated to soldering temperat
