Electronics Forum | Wed Aug 01 12:23:21 EDT 2007 | stepheniii
Don't forget rework, post production eco's and other mods. Also if it's on a generic base, how do you spot slight misplacments? Board shops have some fallout, now the fallout with be with the assembly makers and with components trapped on the subst
Electronics Forum | Wed Dec 03 07:30:57 EST 2008 | realchunks
Hi System Steve, What is a solvent cleaner over water wash? Solvent first and then rinse with water? And why do they feel the need to bake the boards? Do they think trapped moisture will cause board damage?
Electronics Forum | Tue Mar 31 05:48:32 EDT 2009 | d0min0
depending on what is diameter of your balls ;) and smallest electrical distance on the boards (IC legs?? or other) solder balls trapped in ?? or not ?? base on that to see how dangerous your solderballs can be
Electronics Forum | Sat May 02 08:48:32 EDT 2009 | davef
You have a board defect. Any moisture and/or organic contaminants trapped by the solder resist during lamination may cause solder mask delamination, blistering and/or adhesion loss during subsequent soldering operations or during extended use.
Electronics Forum | Thu Mar 25 12:34:26 EDT 2010 | bgaguy
the voids will cause a long term relability problem as the part will not be correctly heatsinked. Change your stencil aperature to a "+" sign 15-20 mils wide in the center of the pad. ___________ : | : : | : :----|----: : | : :__
Electronics Forum | Tue Sep 07 12:57:00 EDT 2010 | jrr3434
Thanks for the info mike. How well do these batch cleaners work with densely populated through hole boards that were solder with no clean flux? Is there a problem with water getting trapped under large capacitors? I'm using kester 959t for flux on b
Electronics Forum | Fri Jan 21 11:00:56 EST 2011 | xps
Hi, in my experience, the humidity is trapped in the solder paste. Otherwise you can also try to : adjust preheat profile, and /or increase paste viscosity, and /or increase paste metal content (they are the most common causes).
Electronics Forum | Mon Sep 26 15:14:56 EDT 2011 | nucleartoast
I agree with Shean that contamianted air is your problem. Either water or oil got into the supply line and is mixing with the flux. You should have both a water and oil trap at the inlet of the machine and not back at the compressor.
Electronics Forum | Thu Sep 13 18:00:35 EDT 2012 | mark25y2001
possible problem are loading orientation, solder flow cannot reach the pad portion due to trap of the body of the diode... or try to adjust turbulent but observe overflow... because turbulent are penetrate solder to pad and terminal of the diode. ho
Electronics Forum | Thu Feb 14 17:40:34 EST 2013 | jorge_quijano
PCB Supplier made an EDX anaysis, the found a chemical trapped in the holes, and some burnt burrs, according to what they say this stains are over the solder mask & silk, so they do not affect functionality.
