Electronics Forum: two passes (Page 10 of 22)

Suspect BGAs

Electronics Forum | Tue Mar 16 17:05:14 EST 1999 | Jeff Dahlin

We are having a small number (~2%) of our boards pass our manufacturing diagnostics, fail once they reach the customer, fail when they get back to us and then start working again after handling them for a short time. We have eliminated a lot of item

Re: Suspect BGAs

Electronics Forum | Wed Mar 17 09:32:35 EST 1999 | Dave F

We are having a small number (~2%) of our boards pass our manufacturing diagnostics, fail once they reach the customer, fail when they get back to us and then start working again after handling them for a short time. We have eliminated a lot of it

Re: Cold Welding Phenomenon

Electronics Forum | Tue Mar 10 03:01:30 EST 1998 | Pete Sorenson

Cold Welding I'm presently doing a project on reflow profiling. I came across this expression. Can someone please give me a definition. Best Regards Tom Mc Grath A cold weld is a joint between two metals produced by the application of pr

Second Pass In Wavesolder

Electronics Forum | Mon Dec 31 08:51:58 EST 2001 | davef

Warp depends on: * How close the board gets to its Tg during the solder cycle (the closer you get to the Tg the worse the warp gets) * Amount of copper on each side and the balance between the two * Thickness of the board * Overall length x width * T

Calculating PCB surface area

Electronics Forum | Fri May 17 03:04:15 EDT 2002 | Mike Konrad

This conversation reminds me of the old �How Many Engineers Does It Take To�� joke. We manufacturer the ionic contamination (ROSE, SEC) testers and I am not aware of anyone that performs such exacting surface area calculations. Most people use th

Flux residue?

Electronics Forum | Wed Apr 30 14:35:35 EDT 2003 | clarkk

Hello all, We have received reports from two customers about electrical leakage on pcb assemblies that used Kester paste #HM531 (63/37) and washed with Kester 'Bio-kleen' saponifier and DI water. The leakage is such that when the boards receive power

World Class First Time Yield

Electronics Forum | Sat Dec 27 01:32:42 EST 2003 | Ian Chan

IMHO, depending on whether its a regular run model, or a properly designed/setup pilot run model, getting a mean 75%-95% First Pass Yield (FPY%) is possible as a benchmark target. This is derived from your manufacturing history capabilities, and requ

SMT Solder paste and wave flux evaluation

Electronics Forum | Fri Jan 28 12:29:01 EST 2005 | Bob R.

We use the exact same method Chunks outlined for evaluating just about anything we're going to roll out worldwide, whether it's a material or a machine. List your factors (print speed, solder spread, etc), assign each a weight, evaluate each paste a

COB Issue's (non-sticking)

Electronics Forum | Fri May 20 02:04:26 EDT 2005 | kvanzill

Hello, I have been having random yeild problems with my COB process where we have non-sticking issues and no parameters have been changed on the machine from one assembly to the next. I recently inquired to the board manufacturer's about thier proce

Fuji parts out Signal for poka-yoke component replenishment

Electronics Forum | Wed Apr 04 18:25:07 EDT 2007 | darby

Don't think much of the people who run the line do you mate? "BUT is operator dependent, so if he feels lucky just change the reel without verification and machine will not stop if he didn't follow the procedure having a high probability of Wrong co


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