Electronics Forum | Mon Mar 22 14:54:40 EDT 2010 | davef
Look here: * http://www.jetec.com/PCBarticle.html * http://www.uidlaser.com/2d-matrix-etching.php We have no relationship, nor receive benefit from the companies referenced above.
Electronics Forum | Fri Sep 10 08:23:34 EDT 2010 | duso02
We have done it before prior to conformal coating a customer's populated board with parylene. They had us do a sample first then conducted testing. No ill effects but it really comes down to the components installed and what they can handle. The surf
Electronics Forum | Thu Jan 10 11:22:48 EST 2013 | pbarton
Looks to me like under etching of the underlying copper and the gold is just plated to all of the exposed copper surface. Is this characteristic the same on all solderable pads? You will not be able to remove this gold.
Electronics Forum | Tue Jan 15 10:35:08 EST 2013 | boriskilk
We would agree with Pete B about both the under etching as a possible issue and you will not be able to remove this gold. Another possibility is the solder mask (plating resist) hasn't been taken right to the edge of the pad.
Electronics Forum | Wed May 14 13:31:22 EDT 2014 | taiji
You should look in to this document: IPC/JEDEC-9704A Printed Circuit Assembly Strain Gage Test Guideline Regards
Electronics Forum | Thu May 15 17:34:17 EDT 2014 | taiji
I always made tests with gauges on top or bottom surface of the PCB, before, during and after the process that we wanted to check. But I never tried to do it on internal layers of PCB. Don't know if that is possible. Regards
Electronics Forum | Thu May 28 19:21:04 EDT 2015 | groth12345
I am the Sales Manager for Plasma Etch. We have systems starting at $7K for cleaning PCBs up to 4" x 7". Please contact me at plasmaetchsteve@aol.com Thank you.
Electronics Forum | Tue Apr 12 19:22:44 EDT 2016 | szs0080
Hello, I did drop testing of some sample boards which had 15mm SAC105&305 BGA's on them. I polished them real nice and looked it under optical microscope for cracks. Was wondering the etching procedure before looking it under SEM. Thanks
Electronics Forum | Wed Oct 12 11:02:59 EDT 2016 | hken
I think stencil manufacturers back fill half etched fiducials with black epoxy or something. I know I've had some worn and that's what I've done for my vision systems to be happy again.
Electronics Forum | Tue Feb 20 15:23:28 EST 2018 | dleeper
Proper fiducials are going to be more accurate than drill holes. Since drilling is a separate step in the PCB fab process, the registration to the PCB isn't as accurate as the copper etching process which forms the fiducials. In a pinch, it can be u
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