Electronics Forum | Mon Apr 04 09:30:49 EDT 2005 | russ
Andrew, we need a lot more information to help. 1. what is the open caused from? bemt pins, non-wetting, board bowing, or no paste deposited. 2. What is your current stencil design? 3. What does this connector look like and what are the pins? Rus
Electronics Forum | Mon Apr 04 12:16:32 EDT 2005 | DasonC
We make a custom mini stencil to print the paste onto the QFN and flip over to load on the rework station. The mini-stencil was designed for SRT to pick up the QFN. Check BeamOn (stencil house) for detail. Good luck
Electronics Forum | Thu Apr 21 18:14:56 EDT 2005 | paulhaines2000
Not sure why - all I know is customer will not allow any foreign material outside of what was intended in design. These are large RF boards and maybe they are afraid this will attract contamination that will affect performance???
Electronics Forum | Wed Apr 27 11:43:32 EDT 2005 | patrickbruneel
Hi Daan, What we did in the time was pareto analyses on all board designs to determine the critical areas (mainly design errors) and only inspect those specific problem areas. Every batch had a copy of the PC board with problem areas marked and only
Electronics Forum | Tue May 03 15:22:02 EDT 2005 | cuculi54986@yahoo.com
ScanCAD comes to mind. I don't have any experience with it but I have heard of it. I think it is designed to do what you are asking.
Electronics Forum | Wed May 11 19:41:39 EDT 2005 | keegomaster
Thanks, Frank. What are your inspection means? Visual? X-RAY? Thanks for the comments! Cheers! DSR
Electronics Forum | Thu May 12 17:25:57 EDT 2005 | keegomaster
Thanks Rob, very useful comments. Thanks Deyo, yours too! I truly appreciate every single line on this talk! Cheers!
Electronics Forum | Mon May 16 07:18:40 EDT 2005 | davef
We agree with an earlier poster. Try it and carefully observe the results. We agree with earlier comments. Consider a paste with a more current design. WS709, while SOA in it's day and still a very good paste, is dated.
Electronics Forum | Mon May 23 13:07:12 EDT 2005 | russ
this is usually the case however you may want to contact design shop to verify and get there coding schemes. T= Transformer CR= Diode D = Diode L = Inductor C+ = Tantalum cap? C = Cap Q = transistor
Electronics Forum | Thu May 26 14:29:16 EDT 2005 | PeteP
An elusive cause can be Bill of Material Quantity errors vs. actual placements. Check the programs to the Bills and designators on the BOM to Qty. if the postings above do not net results.
