Electronics Forum | Fri Nov 16 10:58:31 EST 2001 | slthomas
Short of locking them up and checking them in and out (and writing up your operators for not checking them back in at the end of a shift), I dunno. In short, I think ya gotta be a tool Nazi. We only use hand tools (assigned to the operator's pers
Electronics Forum | Thu Nov 22 08:30:59 EST 2001 | krs
I have heard of this but do not have direct experience. Immersion tin is susceptible to moisture absorption particularly after washing off solder paste. So it sounds like your boards are picking up the solvent off the screen. Water rinse or degrease
Electronics Forum | Mon Nov 19 10:18:03 EST 2001 | gzweig
There is no question but that x-radiation is an ionizing radiation and can effect components sensitive to ionization . The higher the power level of the x-ray source, the higher the amount of ionization taking place. At low levels of x-ray we have ne
Electronics Forum | Wed Nov 21 05:12:26 EST 2001 | frha
Thanks!! I have bought this book. SPC for SMT by William S. Messina. It is an book with very deep calculations, I need to have the basics on place first - which characteristics may vary from unit to unit and batch to batch. I think that we have a V
Electronics Forum | Tue Nov 20 08:31:26 EST 2001 | rkey
I lost my copy of the software 'CSM TOOLBOX' (and optimizer) Does someone have another copy of it ?? I already contact Philips EMT but they doesn't have it anymore! Does someone still have this software or does someone know where to get (maybe down
Electronics Forum | Fri Nov 23 11:58:18 EST 2001 | Warren Pumyea AMT, Inc.
Hello, I have a copy of the toolbox. Have not used it for a while so I'm not sure about the optimizer. please respond and let me know what e-mail address to send it too. Regards, Warren Pumyea AMT, Inc. Contract Manufacturer 978-840-3070
Electronics Forum | Fri Nov 23 11:58:20 EST 2001 | Warren Pumyea AMT, Inc.
Hello, I have a copy of the toolbox. Have not used it for a while so I'm not sure about the optimizer. please respond and let me know what e-mail address to send it too. Regards, Warren Pumyea AMT, Inc. Contract Manufacturer 978-840-3070
Electronics Forum | Wed Nov 21 10:41:03 EST 2001 | arzu
Hello, Sometimes you have no choice other than putting uvias in ubga's-pads. I know examples of high-end mass production of products with ubgas having voids. (no problems, but always voids visable in x-ray) I also performed a DOE a while ago to avoid
Electronics Forum | Wed Nov 21 21:50:50 EST 2001 | Glenn Robertson
Tony, What you are seeing can occasionally be caused by gaps in the plating of the blind vias. If they are not "airtight" you can get moisture coming from the laminate that shows up as voids in the solder balls. You might check on the board sup
Electronics Forum | Tue Jan 21 16:28:02 EST 2003 | tony_sauve
Sorry I didn't close this one off last year... We had some failure analysis done on these PCB's ( 3D x-ray,microsectioning,SEM) and the results definitively proved that there was some contamination @ the base of the uvia's that had the voiding. It ap
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