Electronics Forum | Sun Feb 04 15:06:20 EST 2007 | Scotty
Profile should have a longer cool soak. Verify as was mentioned all pin/fixture support through out the entire process. Print, Place, pre reflow hand load, post reflow, carriers, ICT, Depanel and FCT. Conformal Coated or Potted? Mylars work well for
Electronics Forum | Thu Mar 15 12:22:13 EDT 2007 | Steve
Hi All! There were a few rigid flex assemblies brought to me this morning with some scratches in the coverlay of the flex. They are pretty minor, but they do go down into some traces a bit. I don't think the traces are really signal traces, but are
Electronics Forum | Fri Jan 30 14:20:55 EST 2009 | scottp
I do a lot of thermal cycle testing of new components for my company and often when I lay out a test board I'm trying to simulate 4 or 6 layer boards but I don't need them for routing so I just use a solid fill of a cross-hatch pattern. I've done it
Electronics Forum | Fri Apr 10 07:52:16 EDT 2009 | davef
On cure checking, we have this undated note from Jack Crawford at IPC * IPC-SM-840C "Qualification and Performance of Permanent Solder Mask" has several Test Methods for different types of solder resist material, but probably the only applicable one
Electronics Forum | Tue Jun 09 23:00:53 EDT 2009 | davef
Suppliers are: * Asymtek; 2762 Loker Ave West, Carlsbad, CA 92010; 800-279-6835 760-431-1919 F760-431-2678 asymtek.com * Ultrasonic Systems; 135 Ward Hill Ave, Haverhill, MA 01835; 978-521-0095 F978-521-7023 ultraspray.com sales@ultraspray.com Stepha
Electronics Forum | Mon Sep 21 21:24:34 EDT 2009 | davef
First, we're not real concerned about gluing induced ESD damage, but conformal coating has a tremendous potential to damage sensitive components. We found a charge of 12 kV generated during the aerosol spraying. Second, ESD-stuff IS very confusing.
Electronics Forum | Wed Jun 30 12:41:25 EDT 2010 | rgduval
In general, if the process has been consistent for a period of time, then one should look at any new variables in the process. Therefore...the supposition that there's a bad lot of components is a very good one. Did Yageo offer any possible explana
Electronics Forum | Mon Feb 06 17:24:26 EST 2017 | westshoredesign
So I had the same question too when I was setting ours up. My lazy (and cheap) solution was: for each program I have a universal path that is used up to the first dispense instruction and after the last one then I covered the surfaces underneath tha
Electronics Forum | Fri Apr 03 08:34:54 EDT 2020 | SMTA-Gregory
We need to be careful with product to avoid introducing a new failure mode, namely corrosion and dendrite growth, especially those running no clean processes! In addition to heat (reflow, wave and some selective soldering processes) killing the vi
Electronics Forum | Tue Aug 25 11:31:41 EDT 2020 | stephendo
yes Once I was using dewers of liquid N2 and recommended switching. I tried using air to the machine so the sensor would let the machine run. Boards went from good to a two inch icicle covering a large area. We went to a wall mounted single stage fi
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