Electronics Forum | Wed Apr 16 10:45:16 EDT 2003 | Takfire
Recent cross-section analysis for a customer complaint revealed voiding in the solder fillet. In some cases, the remains of outgassing were also observed. During the failure analysis, we also observed failures where the solder fillet wicked on the
Electronics Forum | Wed Jun 18 06:41:34 EDT 2003 | emeto
Hi Jipp, If we are talking about 200-500 boards per month the main question is"Is it reasonable to go for semi-automatic production?". You will nead at least 1.Manual stencil printer 2.P&P machine 3.Infrared dryer or reflow oven Most expensive par
Electronics Forum | Thu Aug 21 09:34:57 EDT 2003 | davef
Woa. The more paste that you put a a BGA ball, the more likely that you'll bridge between balls. Why do you need to compensate for the size variance in BGA balls? How does using a 8 thou thick stencil to compensate for ball size variance? Fine pi
Electronics Forum | Thu Aug 21 15:10:59 EDT 2003 | paulm
Such balls (=/- 0.004)size variance can occur in a single part. If I have a ball in a part that could be (according to vendor specs) 0.008 larger than another ball the only way I can insure that the smaller ball makes contact with the paste is to hav
Electronics Forum | Wed Oct 01 13:39:13 EDT 2003 | arturoflores
They take the solder in a dip and look solderability test but when in normal reflow process we got some pins that do not get wet and the appearance is as follows: -Pillow effect on the toe(no front fillet is formed) -There is a sheet of flux between
Electronics Forum | Mon Oct 27 16:58:34 EST 2003 | Stephen
The most common way is to screen print paste for the SMT placement, then then SMT placement then reflow then TH placement followed by wave solder. You won't be able to screen print for the BGA after reflow unless you use a mini stencil. Or you co
Electronics Forum | Wed Nov 19 16:35:27 EST 2003 | davef
We'd be incluned to dip the BGA ball in tacky flux, place the BGA on the PTH interposer, reflow that suka, and get on with things. [Take the people involved out to lunch with the money you save on not buying a stencil.] On damaging the glop top, we'
Electronics Forum | Sun Dec 14 14:24:46 EST 2003 | valuems
HI, We have seen a couple of statements that we just have to reply on. One is the trouble with MPM's in mexico. I feel most of that trouble is because of the technical support and the actual maintenance in mexico, not because of the MPM's. And MP
Electronics Forum | Mon Dec 15 21:31:30 EST 2003 | Dean
Ahmen Brother! I had the unfortunate pleasure of supporting sister factories in Guadalajara and Jauarez. It is a totally different environment. I had a friend at MPM that has a great story about this shop in Mexico that kept buying the Monitor Inte
Electronics Forum | Tue Dec 16 23:57:58 EST 2003 | Grant Petty
Hi, Thanks for the feedback, and this has been helpful. Still not sure what we are going to get yet though. We are based in Australia, so it's also dependent on local support. This can be a problem, because when everything is going ok, all the sal
