Electronics Forum | Wed Apr 16 08:24:07 EDT 2008 | davef
Have you: * Checked the solderability of the component through a test such as Dip & Look? * Checked the solderability of the board by pasting and reflowing a bare board? * Checked the quality of the solder paste print prior to component placement? *
Electronics Forum | Wed Nov 06 08:59:51 EST 2002 | rmorford
This defect is there after reflow. My first thought was that the boards had some sort of contamination, too. This is a new PCB manufacturer for this board (they have been making other boards for us). But... why only on the connectors -- why only o
Electronics Forum | Tue Apr 15 03:16:14 EDT 2008 | janz
Hello, We are having a problem with soldering QFP100 (16mmx16mmx1mm). Board dimensions: 70mmx50mmx1.8. FR4 two layers � single SMT assembly. Finish: HASL-lead free Oven: 7 zones �hot air Paste: lead free We have noticed that two groups of legs
Electronics Forum | Fri Nov 11 04:06:46 EST 2005 | arnold
we are manufacturer of molded type transformer. we have a trim and form process and its damage the pins of our units. the TIN insulation was being damage so we decide to immediately solder (wave soldering) the units to avoid oxidation. my question is
Electronics Forum | Tue Nov 05 18:17:00 EST 2002 | russ
This sounds like a contamination issue with the HASL finish.(solder on lead but not on pad). I have experienced this before and it was related to the HASL process at our supplier. They found some type of contaminate in the bath (unfortunately I can
Electronics Forum | Wed Nov 06 17:50:46 EST 2002 | davef
I hear you on the profiling issue. That won't get at the issue any how. Your observation of solder wetting confirms that solderability is NOT the issue. You may be seeing a "cold solder connection". The issue is the TCE of the different materia
Electronics Forum | Wed Nov 06 14:57:56 EST 2002 | rmorford
Nothing funny seems to happen to the connector when heated. I have no idea how to monitor the temperature of a good pad vs. a bad pad because I have no idea before reflow which ones will be good and which will be bad. I did take a board and rip the
Electronics Forum | Wed Nov 06 10:31:30 EST 2002 | davef
First, from what you say, it's unclear that there is a "solderability" issue with your connectors. Different appearance of the soldered connection from one side of the connector to the other is what we're talking about [I think]. But it is curious.
Electronics Forum | jineshjpr |
Thu Dec 14 04:40:31 EST 2017
Electronics Forum | Thu Dec 14 14:43:54 EST 2017 | kahrpr
Just Curious why would you need to reduce the air speed by 80%
