Electronics Forum | Mon Jun 08 12:42:01 EDT 1998 | Earl Moon
| How do I mechanically/visually inspect BGA devices when they are soldered to a PCB for possible solder, or other, defects as a first step before part removal and further analysis? I have had board failures due to poor soldering--I think? I can pr
Electronics Forum | Thu Jan 03 08:02:53 EST 2002 | davef
Slump is a function of the particular paste you select and the temperature of the paste. Use a slump test like the one that follows to compare fluxes. Slump Test Step Process activity 1 Print paste on white ceramic substrate or microscope sli
Electronics Forum | Thu Mar 06 11:37:17 EST 2003 | msivigny
Hello Phil, sorry for the confusion, because of our level of defect control and tracking at each process step, we did not use AOI systems at the time. We had a manual inspection station after reflow, then ICT and Functional/Final test for each produc
Electronics Forum | Fri Jul 26 14:19:14 EDT 2019 | slthomas
Since our process engineer took off for allegedly greener pastures I've taken it upon myself to provide whatever assistance I can with the process side. In this case I'm trying to get the "2 1/2D" inspection up and running. They've never us
Electronics Forum | Thu Jan 20 13:21:54 EST 2011 | rgduval
Dean, In a previous life, boards came off of the machines, and went to SMT QC, then to SMT T/U before heading off to wash and through-hole. The concept being that the SMT "team" was responsible for the quality coming off the machine, with QC and T/
Electronics Forum | Tue Mar 04 16:50:56 EST 2003 | msivigny
Hello Rohan, this is starting to date nearly 6 years ago but I will remember everything I can, we used a custom interface to input data and everything was stored in a very large database on a specific server only for quality data, I think we used Ora
Electronics Forum | Sat Aug 05 09:22:34 EDT 2000 | Dave F
Stencil, Step Down. A stencil of varying thickness that allows printing different amounts of solder paste or adhesive. Most stencil suppliers make stepped stencils Step stencils are used when there are fine pitched device amoung coarse pitched dev
Electronics Forum | Thu Jan 02 15:32:26 EST 2003 | Mark
Hello. Sometimes metal squeegees DO work with stepped stencils. You will always get much better results with metal squeegees compared to polymer blades. The only requirement for the metal squeegee to work, you need about 0.06 in clearance for eve
Electronics Forum | Thu Feb 23 18:05:53 EST 2006 | kennyg
What are some general guidelines for the minimum proximity of apertures to a stepdown on a stepped stencil. I have a step from 7 mils to 5 (one mil step each on the top and bottom). How far does the step need to extend beyond the apertures on the
Electronics Forum | Mon Aug 12 21:54:33 EDT 2019 | davef
I've never seen successful printing with a step as deep as you seem to be saying. The keep out would have to be jigundous!!!! SMTnet Technical Library: https://smtnet.com/library/files/upload/Step-Stencils-laserjob.pdf I'd guess * Maximum step
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