Electronics Forum | Mon Apr 09 16:46:54 EDT 2007 | stepheniii
Basically its spec. gives surety regarding its > chemical and physical properties. if he doesnt > follow the spec then may be he may find good > physical soldering appearance but chemically it > may goes down through Electrical or Environmental
Electronics Forum | Tue Apr 03 05:09:04 EDT 2007 | Haris
hi it looks like that you got this machine without money or simply like you robbed it. Even if you buy second hand, atleast you know how it works, SECONDLY WHY YOU DO NOT HAVE ITS MANUAL BOOK. OK, BELIVIEING IN THE ABOVE OPTIONS, if you ON pressing
Electronics Forum | Wed Apr 04 19:10:20 EDT 2007 | rgduval
Pete, Top-side temp might be an issue. What's the easiest way to check it? I seem to recall some thermal decals that we used to use a couple of jobs ago. I spoke with the flex manufacturer, and they recommended 4 hours at 250 degrees pre-process
Electronics Forum | Wed Apr 04 19:27:07 EDT 2007 | davef
The easiest, long term cheapest, and most accurate way to measure top-side temperature is to use one like: * http://www.amazon.com/Fluke-62-Mini-Infrared-Thermometer/dp/B000MX5Y9C/ref=pd_sbs_auto_2/102-7460227-1828165 * http://www.amazon.com/gp/prod
Electronics Forum | Mon Apr 09 10:16:14 EDT 2007 | davef
Pick and place: * Fuji: The largest pcb size is 20" by 18" for pick and place; 18"x14" for chip shooters. Fuji NP XL series allows 27 by 23 inch boards using a conveyor. * MYDATA has machines that can be configured to 34" X 44" X 0.500" * HSP 4796A a
Electronics Forum | Fri Apr 06 10:43:57 EDT 2007 | flipit
Hi, Anyone seeing difficulty is soldering MLFs or QFN with lead free solder? I have an MLF with 3 rows of pads on each of the 4 sides of the part and then the large center ground plane in the middle. The part is 20 mil pitch. Had good luck with l
Electronics Forum | Mon Apr 09 14:53:19 EDT 2007 | flipit
Hi, We were running with few defects with lead solder paste. The lead solder paste with stencil 0.010" X 0.020" and 0.004" thick stencil produced near defect free PCB assys. 0.010" X 0.020" (0.004" thick) lead = defect free 0.010" X 0.020" (0.005"
Electronics Forum | Mon Apr 09 16:48:27 EDT 2007 | ratsalad
How wide are your pads? What paste are you using? What is your board finish? Could you please post a link to the datasheet for the component? We place a lot of MLFs, both in a Pb and Pb-free process. Our standard stencil design for MLF compon
Electronics Forum | Mon Apr 23 09:37:20 EDT 2007 | davepick
Assuming you are going to build using a Leaded part on a Lead Free Process - beware of Weak Joints. I saw this at a large Multinational company - They had secondary reflow on a Top Side QFP when the PCB went over the wave. We did pull strength tests
Electronics Forum | Fri Apr 20 18:21:55 EDT 2007 | Hegemon
Consider how the vast majority of PCBs with BGAs are produced. Forced air convection. Anything that comes closer to duplication of the original soldering profile is what you desire. Did they build it with IR or Convection? The process engineer wa
