Electronics Forum | Fri Aug 17 08:37:47 EDT 2001 | jbieber
Gregory, I think that the profile is too radical, i.e. zone 6 to zone 7 temperatures are too far apart. I would guess that the solderjoints have not all reached 183C in zone 6 which is why the uBGA's do not have a symmetrical ball collapse. You may
Electronics Forum | Tue Aug 07 20:43:47 EDT 2001 | davef
First, we know that MIL types are wont to use charts like that. Give �em Weibull distribution tables and then they�ll be happy, happy. A good book is Nelson �Accelerated Testing: Statistical Models �� Wiley Second, we don�t use that very nice stu
Electronics Forum | Mon Sep 24 17:38:18 EDT 2001 | mparker
First question - do you have a rework station? If so, are you experiencing the same type of failures there? I have successfully used no-clean on uBGA's in the past. 6 mil solder bumps, 10 mil spacing. 88 sites. Are you reusing previously soldered uB
Electronics Forum | Sat Oct 27 12:01:32 EDT 2001 | Stefan Witte
Most of the machine suppliers Fuji, Siemens, Universal and Panasonic did regret that they were building glue machines. Applying adhesive compared to placing a component looks so simple, but it is not and the defect rate is higher than placing 1206 c
Electronics Forum | Tue Feb 19 01:20:33 EST 2002 | djarvis
Armin, I installed a second hand Dek Ela in-line in November. Prior to that we had been running 2 x SMTech (Quad ) Vmp100s, an MPM SP-2000 and an MPM SP-20. All semi-autos. I believe the Vmp100s to be a great machine and have recommended them to all
Electronics Forum | Wed Sep 18 12:31:16 EDT 2002 | dragonslayr
My suggestion is to conduct a Design For Manufacturing (DFM)study on the assembly in question. Pay particular attention to the pad sizes, component lead dimensions and satisfy yourself that those two factors are correct. Given that pads match compone
Electronics Forum | Tue Sep 24 22:29:04 EDT 2002 | davef
First, I don't have a clear fix on the problem. Please drill-down to more detail. We appreciate that you probably don't know the parlance. Just describe what you have and then what you'd like to have. Second, most 0402 LED are fabricated just lik
Electronics Forum | Mon Oct 28 08:05:41 EST 2002 | Bob...
Not saying anything new here. I agree with all the comments posted. I have worked in the industry for over 20 years and have experience on all but Mydata. Which machines are you looking at? Fuji CP3’s were too maintenance hungry, CP4.3’s bullet pro
Electronics Forum | Fri Nov 01 11:27:34 EST 2002 | kenBliss
Gimme a break I am rather disappointed with many of the comments here. Most appear to think that the OEM should supply what ever is needed and when ever it is needed and not charge for it or just do it cheap. Or you think they overcharge for it.
Electronics Forum | Thu Dec 26 16:51:47 EST 2002 | davef
First, an earlier poster suggested using DI water. We are NOT excited about DI water with a NC fluxer, unless DI water is the proper flux thinner. Second, as you inplied, the maintenance steps you take should vary according to the amount of time th
