Electronics Forum | Tue Nov 05 14:10:54 EST 2002 | genny
Is there any way that there could be an indicator when we access the site or the forums, that lets us know we have mail? We used to be able to see that info under the old design. I don't use it a lot, but recently when I had a hot thread, I was ge
Electronics Forum | Tue Nov 05 16:41:53 EST 2002 | Ray M
This one's got me stumped, so I thought I'd throw it out for discussion: I have a 20 pin SMT ribbon connector by Molex that I've been using for about a year without problem, but recently things aren't looking so good. The solder is pulled up off of
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 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 | 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 | Fri Nov 22 17:55:39 EST 2002 | robertorre
Your problem may be related to different aspects. 1. Oxidation on landing pads. 2. Either high(To long over liquidous temp) or low temp. 3. Bad solder (not enough vehicles) Run this test: Set a hot plate to 220 degrees C. Make sure you have proper ve
Electronics Forum | Wed Nov 06 12:56:10 EST 2002 | slthomas
What I'm seeing is an occasional pattern of tear drop shaped features in a sea of nice shiny solder. The little islands don't really have any relief.....it's more of a surface finish feature than a 3-dimensional feature. The wetting angles are good,
Electronics Forum | Thu Nov 07 12:51:09 EST 2002 | slthomas
This is embarassing. I've used ipa (actually "70/30 rubbing" alcohol) to clean these for a better view (this is a no-clean), and found the above described anomaly to be intact. So, I assumed it was something in the solder itself. Well, today I us
Electronics Forum | Wed Nov 06 20:18:30 EST 2002 | davef
cvrgrrrl Your first thermal cycle with imm silver should be the easiest to solder. That you see copper indicates you did no soldering, got no wetting, produced no intermetallics, etc. Tell us again which components did not solder? Wuzzis "plug" t
Electronics Forum | Wed Nov 06 16:31:59 EST 2002 | slthomas
I would also consider paste control (don't take it personally...I always have to get after people about this one), time on the stencil, time between print and reflow, solderability of the component leads, paste volume (that one really got us once....
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