Electronics Forum | Wed Oct 15 09:53:01 EDT 2003 | markhoch
These boards also were above liquidus for 75 seconds, and the customer puts the boards thru extensive thermal shock and stress testing. An Alpha Applications engineer told me that because the boards were above 183 degrees for 65-75 seconds that the i
Electronics Forum | Mon Mar 27 20:52:22 EST 2000 | Dave F
Marc: In printed circuit board fabrication, fabricators place sheets of prepreg between each pair of glass cores. They stack these layers into books. As they heat and press the books, the sheet melts into an epoxy glue. The thickness of the prepr
Electronics Forum | Thu Feb 12 17:21:07 EST 1998 | Justin Medernach
| I would appreciate any information concerning the wash and bake of blank Printed Circuit Boards | before assembly. | + Is it necessary to wash and bake PCB�s before assembly? | + If any, what is the reason for wash and bake of PCB�s? | + If any, wh
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 | Thu Dec 12 09:21:42 EST 2002 | blnorman
What we did: *Slump-dot diameter and height as a function of time *Print Speed-Vary speed, measure slump and missing/defects *Green Strength-We quantifiably measured tack vs time and we placed components and measure skew by SVS *Cure profile sensitiv
Electronics Forum | Mon Apr 29 22:25:30 EDT 2019 | pcbindex1
Besides, regulated power supply should be installed separately on the printing boards. When power and circuits share the same printing boards, it should be avoided that regulated power supply and circuit components are mixed or power and circuits sha
Electronics Forum | Thu Nov 17 21:52:27 EST 2022 | stephendo
You might be able to create a process that involves testing a sample before each run. But then you would need something showing that a given batch would be consistent enough to justify testing a pcb to prove the batch. Or if they accept SPC then you
Electronics Forum | Sat Sep 17 20:37:24 EDT 2022 | kumarb
Hi. About 2 years ago we designed a practice test board to confirm our understanding and capabilities of our YV88X PnP machine. We managed to place 01005 parts onto the PCB using a custom nozzle from Shenzhen. See attached - this is just one part of
Electronics Forum | Tue Sep 05 16:04:43 EDT 2000 | Dave F
Pascal: Responding to your questions: 1 Do we have to dry the PCB after cleaning (sic)? Generally, nothing says you have dry the PCB after aqueous cleaning. Along this line, I received several thoughtful responses when I posted a similar thread.
Electronics Forum | Wed Nov 20 16:53:18 EST 2002 | davef
Q1: How important is the bare PCB baking ? A1: Baking boards is a non-value added activity. Q2: What is the temperature for baking @ what RH ? A2: Search the fine SMTnet Arcives for bake recipes. Q3: What would be the impact for the ENTEK finishe
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