Electronics Forum | Fri Oct 01 07:25:05 EDT 1999 | Wolfgang Busko
| | Hi, | | | | We are running 0402 component on the TCM1000 and we find that teher will be missalignment on 0402 Capositor. We have identified that the missalignment is caused by the wrong information from the vision system while doing vision cente
Electronics Forum | Tue Jan 02 16:49:14 EST 2007 | dyoungquist
I am looking for data on the yield of printed circuit board assemblies so that I can judge if our SMT line is performing up to typical industry standards. Following I will describe the details of the assembly and what our yield has been. Each board
Electronics Forum | Thu Jan 04 15:39:07 EST 2007 | dyoungquist
While the 85% yield on a per board basis seems low, we are actually running over 99% yield on a per solder joint basis as there are about 17,700 joints per panel. On average, 9 out of 63 boards in the panel need rework. Rework issues include missin
Electronics Forum | Wed Jan 10 20:06:43 EST 2007 | SSS
I've been assembling thousands of boards for dozens of customers over the past 5 years with 0402 chip components. 85% can happen very easily even with newer equipment. Defect challanges with 0402 packages is almost always tombstoning. Capacitors abou
Electronics Forum | Mon Jan 08 03:47:47 EST 2007 | tk380514
as someone had said before, check you stencil and have it redesigned. I design our stencils for my factory and have inproved quality in BGA , QFP and 0603 case sizes. we did have 1 prototype series that used 0403 chips btu we had brand new feeders an
Electronics Forum | Mon Feb 18 04:08:50 EST 2002 | wbu
Never heard of billboarding. Could you please explain what that means according to 0603�s. Headshaking Wolfgang
Electronics Forum | Mon Feb 18 08:30:28 EST 2002 | jax
Wolfgang, Billboarding is kinda like a tombstone. The part is just sitting on it's side instead of on it's end. There should be plenty of info on this in the archives under billboard and tombstone. Most likely cause is off center placement and ov
Electronics Forum | Fri Feb 15 12:40:37 EST 2002 | MarkQ
I have some billboarding 0603's and I'm trying to find potential causes. Small boards 2"X 3". .060"thk Hasl surface.
Electronics Forum | Fri Feb 22 11:49:42 EST 2002 | stimpman
Hi, Have you checked your placements pre-reflow? The most typical cause of a billboard unlike tombstoning is a pick and place issue. Billboarding will usually happen with ( profile/bad pad layout and the most common just poor center placement. I'v
Electronics Forum | Mon Feb 18 22:18:06 EST 2002 | mantis
Yep i agree most likely misplacment or reflow, maybe check your air flow around the liquidous zones(if convection oven) probably too low.
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