Electronics Forum | Sat Sep 14 12:24:44 EDT 2002 | scottefiske
We need to remember here that as printer manufacturers were enhancing their product lines, miniaturization was quickly being developed in the background. In the last 2 years I was involved in developing and conducting a D.O.E./F.M.E.A in determining
Electronics Forum | Sun Sep 15 15:08:00 EDT 2002 | jersbo
My 2 cents... Screen printing may very well have a leg up on deciding SMT defects... however if you pay attention to your stencil (aperture size ratio etc..) and inspect your prints... I believe its a much lesser number... (paste MFG also plays a ro
Electronics Forum | Fri Nov 23 14:47:35 EST 2001 | kgroen
Some comments on the previous post: Be careful when looking at the proportion of SMT defects that are solder defects - you may very well find that only a small few of them originate at the screen printing step. As for specification limits for pas
Electronics Forum | Thu Mar 04 18:18:02 EST 2004 | Ken
There is a japanese company that makes a ultrasonic hand-held stencil cleaner. I demo'd it for a day and it was fantastic! It even cleaned epoxy stencils. Can't recall the price...but it should be much much less than the smart sonic and other "mac
Electronics Forum | Mon Sep 17 15:27:51 EDT 2001 | jschake
Challenges: The basic defects that impact assembly yield are bridging, satellite solder balls, and opens (i.e. tombstones / draw bridges). There are many variables with the stencil printing process that can impact these; several of them are listed
Electronics Forum | Fri Mar 12 11:59:50 EST 1999 | Ray Morford
AVX and a few other companies make these chip transient voltage suppressors (TVS) parts that are a real *PAIN* to use. According to AVX: "Due to the semiconducting nature of the doped Zinc Oxide (ZnO) ceramic material, SMT TransGuards are no
Electronics Forum | Wed Oct 03 23:59:44 EDT 2018 | gaintstar
Flason SMT problem solving: http://www.flason-smt.com/new/PRINCIPLE-OF-SURFACE-MOUNT-PROCESS-SMT-PROCESS.html http://www.flason-smt.com/new/Printed-Circuit-Board-PCB-Price-Estimator.html http://www.flason-smt.com/new/Printed-Circuit-Board-Solder-res
Electronics Forum | Fri Mar 12 20:19:46 EST 1999 | Dean
| AVX and a few other companies make these chip transient voltage suppressors (TVS) parts that are a real *PAIN* to use. According to AVX: | "Due to the semiconducting nature of the doped Zinc Oxide (ZnO) ceramic material, SMT TransGuards ar
Electronics Forum | Wed Mar 27 19:26:53 EST 2002 | ianchan
After a whole night's self review, I think we can term the slant/tilt as "floating 0805, yet end-terminals have acceptable solder joint formation". the width portion of the 0805 RES/CAP is (floating)elevated from the PCB pad, yet both (width) termin
Electronics Forum | Thu Mar 05 13:17:19 EST 1998 | Justin Medernach
| Hello everyone! | Does any know anything about bare board size variations? | Is there a spec. or tolerance? | I'm running small lots of boards and during the screen printing process | I find that I cannot paste each board perfectly.I've tried other
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