Electronics Forum | Tue Oct 16 14:18:41 EDT 2012 | ericrr
My guess is a manual machine would be good for a after sales "repair station" or the engineers doing product development, without it you would have almost drop a large integrated circuit (IC) on to the spot and poke around with it moving it sideways
Electronics Forum | Tue Nov 13 10:29:55 EST 2012 | 15009
I am looking for opinions on how much larger soldermask pads should be versus the copper. I am aware that some pcb manufacturers can hold tighter tolerances than others but is there an IPC recommendation? Some shops we deal with can hold .002 per sid
Electronics Forum | Fri Jan 18 12:34:14 EST 2013 | duchoang
Yes, I have. think I have pretty good reflow profile. We use Lead-Free,No-Clean,SAC305 Solder Paste. The problem is at LGA design.The pad size is alot bigger than BGA. They are totally flat and do not have balls/spheres which melted and collapsed thr
Electronics Forum | Wed Jan 30 17:23:07 EST 2013 | dyoungquist
In response to hegemon... This is not a recommended practice but..... We have added a few drops of water soluble flux to our water soluble solder paste when the paste is on the stencil. This was after the paste had "dried" out a bit. We have had
Electronics Forum | Mon Apr 15 21:00:57 EDT 2013 | dman97
Hi, I have another problem. This time with a vintage 1995 GSM machine. Upon startup, I am seeing a part to pad LED tower time out. The GSM knowledge base says to change they relay at CR1 on the power distribution board. On this machine, the power
Electronics Forum | Wed May 22 19:47:30 EDT 2013 | anvil1021
Also, I was just thinking that most of the large companies we work with do not consider via drain an actual void. As a matter of fact our high dollar super fantastic Xray system actually has a switch to turn off the vias during void detection so that
Electronics Forum | Wed May 29 18:52:59 EDT 2013 | navworx
Would like opinions on which brand of leaded water soluble solder has the longest print life. we're currently using Alpha WS-809. Each board goes through the printer every 15 minutes or so, and we wind up re-printing most boards as the solder isn't
Electronics Forum | Mon Jul 01 13:19:55 EDT 2013 | emeto
I always look for a toe fillet if the design allows you to. Many times the pad design is close or exactly the size of the leads which makes people to touch it up right away. I told them hundred times not to but...Luckily I have 3D x-ray and I can tel
Electronics Forum | Mon Jul 29 19:39:57 EDT 2013 | hegemon
No problem running lead free without nitrogen. Careful profiling will take care of the soldering. Cosmetically, the Nitrogen reflow is superior for lead free, and we see much better wetting, better coverage of the PWB pads, and of course the smooth
Electronics Forum | Mon Oct 28 08:27:53 EDT 2013 | emeto
There are many profilers(physical devices) on the market. Most of them have software that makes predictions based on information about the paste, oven model...., but I wouldn't trust the predictor as on your boards you will have different parameters
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