Electronics Forum | Tue Aug 25 08:04:26 EDT 2009 | davef
Trapped moisture can be a problem, and one standard recommends baking a PCB for a minimum of 4 hours at 93+/- 5.5ºC before conformally coating. [NASA-STD-8739.1, “Workmanship Standard for Staking and Conformal Coating of Printed Wiring Boards and Ele
Electronics Forum | Wed Sep 01 08:16:55 EDT 2010 | sachu_70
Drill holes or tooling holes have higher tolerances than Fiducial marks during PCB fabrication. I would certainly recommend Fiducial recognition as a more reliable approach for better accuracy. You could re-calibrate the Vision system file used for
Electronics Forum | Mon Aug 20 16:33:20 EDT 2012 | aelektronik
Hi Looking for a recommendation on a PCB manufacturer preferably from your own experience. For Small-medium series (up to few thousand boards) and prototypes. 4 to 8 layers with ENIG and 10mil Vias. Boards that are Real IPC Class 2 or 3 compliant.
Electronics Forum | Tue Jul 31 04:53:28 EDT 2018 | teresat2
The UL Safety Laboratory is the most authoritative in the United States and a large private institution engaged in safety testing and identification. The UL+ number on the PCB mainly represents the UL certification of the circuit board in the United
Electronics Forum | Tue May 11 18:59:36 EDT 2021 | rgduval
It's annoying, but, the last time I was faced with a similar issue, we ended up sanding the edge on the PCB after depanelization. I stronly recommend charging for this service. It could be sped up by using a Dremel fixed in a vice, but, I would cau
Electronics Forum | Thu Mar 11 03:03:26 EST 2010 | grahamcooper22
Hi , Looking at your photo....can I also see a hole in the middle of the joint on the chip component ? Maybe its not just a problem with th ejoint son diodes ? Did you also get mid chip solder balls on chips? If so, I'd almost guarantee the pcb has t
Electronics Forum | Sat Jan 31 09:59:45 EST 2004 | D Meek
Hoping somebody may be able to help recommending a source of educational video demonstrating the principles behind PCB manufacture, component pick and place and smt. Any help would be appreciated. D Meek
Electronics Forum | Thu Nov 16 10:15:12 EST 2006 | SWAG
Does anyone have new info on their ROHS PCB delam. problems? We ran two profiles (different from ours) per supplier recommendations with no improvement on this problem. These profiles included a plateau or soak at 190 deg. C for 20 seconds and a sl
Electronics Forum | Thu Apr 30 08:33:42 EDT 2009 | kpm135
In regards to your panelized PCB it sounds like your step and repeat in you pnp program is slightly off, by 0.02mm from the sound of it. Are all of the components moving in the same direction as the fine pitched IC? I don't know what type of machin
Electronics Forum | Sat Oct 22 09:02:46 EDT 2011 | mojomatt
Yes it is used for PCB, I have used it in the Automotive Service Industry for many uses. Most popular as a Brake assembly cleaning agent. It is popular today due to its low FLASH POINT, unlike other solvents that contain Heptane, Xylene etc thease ha
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