Electronics Forum | Thu Mar 02 05:30:45 EST 2006 | arnie
we are encountering a problem wherein the ballast transformer we built on the pcb produced a vibration or a humming sound.? what is the possible cause on it. what may the problem on the assembly of transformer.
Electronics Forum | Mon Jun 05 14:09:36 EDT 2000 | Jason
We would like to gauge or precentage of production line failures to industry standard AQL level. What would be an acceptale AQL level for assembled pcb's or finished units leaving the factory?
Electronics Forum | Wed Mar 19 08:38:13 EDT 2014 | davef
I can't picture much of what you're saying, not for nothing, I'm just not connecting. During assembly, solder mask can affected by heat and chemicals. Typically this would be during: * Soldering * Cleaning I will tell you this: Not to defend assem
Electronics Forum | Tue Mar 18 11:53:58 EDT 2014 | sara_pcb
Our contract manufacturing agency have procured pcbs from approved vendor. After assembly we found solder mask separated from the PCB on the epoxy area as patches. The top side is intact. also over the pcb tracks, the mask got damaged. In what c
Electronics Forum | Wed Jan 14 12:40:46 EST 2015 | dyoungquist
MSL is used for components (and possibly bare pcbs) that are going to go through a reflow oven process in the future. In most cases, populated pcb assemblies will not be going through the reflow oven process again. Therefore, it is not necessary to
Electronics Forum | Thu Jan 19 21:43:33 EST 2006 | davef
Specifically, what element of the bare board is blistering? Tg of 140 could be acceptable. Search the fine SMTnet Archives for background on decomposition temperature [td]
Electronics Forum | Fri Feb 28 03:34:21 EST 2014 | jlawson
MSS Valor Process Preparation, also has great gerber processing... http://www.mentor.com/pcb-manufacturing-assembly/products/valor-mss-process-preparation But as stated gerber was never intended to cope with assembly data only fabrication hence not
Electronics Forum | Fri Feb 28 03:32:04 EST 2014 | jlawson
Also Valor MSS Process Preparation toolhttp://www.mentor.com/pcb-manufacturing-assembly/products/valor-mss-process-preparation Has great gerber processing tools, but as stated gerber was never targeted at SMT assembly SO ALL tools have to re-process
Electronics Forum | Mon Feb 24 12:41:18 EST 2014 | mi
Depending on what X-Y centroid / CAD data you need, there are different SW I've used to do the job. If you need PCB gerber "artwork" (rounds, rectangles, lines, squares,...geometric figures), you can use GraphicCode GC-Place & such - load the gerber
Electronics Forum | Thu Jun 08 09:26:26 EDT 2023 | frankchan
placement> (curing)> reflow soldering> cleaning> inspection> rework SMT production process Surface mount process a. Single-sided assembly: (All surface-mount components are on one side of the PCB) Incoming inspection-solder paste stirring-screen prin
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