Electronics Forum | Thu Feb 14 23:37:38 EST 2008 | operator
That is bizarre. I would have to say that you need to do a test on the PCB to test solderability with an iron like mentioned before. If you don't find that the pads are contaminated or masked over lightly and the pads do take solder effortlessly, you
Electronics Forum | Fri Feb 15 08:44:42 EST 2008 | mmjm_1099
FYI, Here are the steps in which we take to get approval. The stencil gerber layer needs final approval through our Engineering dept. What they do is send in a gerber layer from the stencil house and lays it over the current solder paste layer and ve
Electronics Forum | Fri Feb 15 15:55:58 EST 2008 | pjc
This is from the OmniFlo 5 Engineering data sheet: EXHAUST SPECIFICATIONS: STANDARD AIR OPERATION: - Load-end: 150 cfm (255 m3/hr) at the 4� (102 mm) stack (minimum requirement) - Unload-end: 300 cfm (510 m3/hr) at the 4� (102 mm) stack (minimum req
Electronics Forum | Tue Feb 19 09:41:26 EST 2008 | slthomas
ECD sells the MOLE, and they sell both the Oven Rider and the Wave Rider to accompany it. The thing is, you can profile both an oven and a wave machine without either if you're willing to just solder your thermocouples to a board. The nice thing ab
Electronics Forum | Tue Feb 19 12:41:20 EST 2008 | patrickbruneel
Yes dendrites can cause electrical shorts. The first stage of dendritic growth is a dark fern like pattern which reduce surface insulation between anode and cathode. In a more advanced stage the ferns transfer the plating metals of the conductors and
Electronics Forum | Fri Feb 22 14:22:07 EST 2008 | stevek
Are you using nocleans, especially when you get to SMT? Years ago, I had OA wave flux get into vias that were plugged from the top under parts. It is really difficult to clean small, high aspect ratio vias. Cross sections showed that the copper in
Electronics Forum | Fri Feb 22 13:24:24 EST 2008 | mulder0990
How did I know senior was going to get in here too. Nice to see you again. I figured as much with the height difference, but I do not have the equipment here to test my thoughts. We somehow have our machine dialed in to run the 0201 parts with W
Electronics Forum | Tue Feb 26 17:00:15 EST 2008 | slthomas
I haven't had the luxury of machine based pth assembly in quite a while, but when I did, given that the machines control which parts are inserted (and to a lesser degree where they are inserted) we decided not to perform inspection on that part of th
Electronics Forum | Mon Feb 25 08:14:04 EST 2008 | adetuc
Hi ... We use DRS24C Air-Vac machines for placing BGA devices, and have been having problems with shorts on corners of one device in particular, its a PBGA and its size is 4.5cm square and 15grams weight. When the component is picked up and the com
Electronics Forum | Tue Feb 26 05:10:17 EST 2008 | adetuc
Thanks for the reply Hege, I calibrate the machines every 3 months and have checked that the board carrier to nozzle parralelism is ok. Have tried many different profile settings using a MOLE for readings but still collapsing on one corner. I did
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