Electronics Forum | Fri Oct 31 09:26:08 EDT 2014 | rgduval
I do not recommend ever leaving the top of a via-in-pad open. Cap the via in the pad. Leaving it open for "solder to stuff the hole" causes issues in assembly, notably insufficient solder due to vampirism (the solder wicks into the via, rather than
Electronics Forum | Thu Nov 06 14:24:52 EST 2014 | wolverine
As part of the process of assembly, we have to scuff the surface of our board around the border about a half inch in from the edge before application of an adhesive. We have been doing this by hand with 60 grit sandpaper, we are looking for a way to
Electronics Forum | Fri Nov 21 10:28:23 EST 2014 | gregp
Hi Adam, So with two to three people on the slide line, each only able to place five different components maximum, this means you generally don't exceed 10-15 through hole parts per assembly, correct? I am guessing these are mixed technology boards
Electronics Forum | Mon Mar 09 04:28:39 EDT 2015 | hansk
Dear all, new Royonic equipment can be ordered at Mycronic Germany. http://www.mycronic.com/www2/main.nsf/content.xsp?action=openDocument&documentId=5ED0C834AADB1130C1257CC200390FB4&cat=C47&first=true best regards Hans
Electronics Forum | Wed Dec 31 09:10:48 EST 2014 | rgduval
If you suspect a short, check the resistance on a new board that hasn't been powered up. The data sheet should give you the junction resistances that you're looking for. Double check against a component not assembled on the board. If you measure a
Electronics Forum | Tue Oct 13 06:20:50 EDT 2015 | eniac
Most powerfull tool for PCB design - it's your brain, Richard. All others - just a auxiliary instruments. I have assembled a good project, which was designed in Paint (yes, I mean Microsoft Paint!), and, also, I have many examples of bad projects, wh
Electronics Forum | Mon Feb 09 06:56:39 EST 2015 | saoasasd
What is the maximum PCB shelf life for double side PCBs after first reflow? I mean, after assembly bottom side, how long can I keep the PCB without solder paste waiting for the second reflow? (Considering exposure on production environment conditions
Electronics Forum | Mon Feb 09 07:55:16 EST 2015 | jax
Without knowing the surface finish of the PCB lets focus on an alternative problem... At a minimum, you need to look at the 1/2 built assembly like individual components, all having their own MSD levels and all subject to 2nd side reflow temperatures
Electronics Forum | Wed Feb 11 14:55:52 EST 2015 | erezah
we received assembled PCBs with spots that look like a bleach spots all over the PS and CS . The board house said that this is normal due to flux aqueous wash process. Can it cause problems (e.g. corrosion ) in the long run or cause issues when wor
Electronics Forum | Wed Feb 11 16:38:20 EST 2015 | barryg
I was curious what others in pcb assembly are doing as far as profiling. Is profiling an important part of the smt process? Should every board type processed be profiled to determine optimum oven temps per paste recommendations.Is it ok to assume tha
