Electronics Forum: solder paste inspection (Page 651 of 749)

Stencil-PCB Alignment Mehods - Printing process

Electronics Forum | Fri Dec 09 11:00:27 EST 2011 | alexanderb

Dear All, I am a totally new to the SMT process. In fact, I just had an overview course regarding the whole process of PCBA manufacturing and I have know a bunch of questions in my head. Most of them are linked to the solder paste printing process

Inline wash foam

Electronics Forum | Mon Jul 02 18:40:33 EDT 2012 | joeherz

We used to have a Nuclean 324 that was running closed loop with a DI water recirc system. We also had problems with foaming that was solved with a relatively simple fix. We bypassed the final rinse solenoid so that it was always running. This allo

Ceramic BGA Balls Move Post Assy

Electronics Forum | Wed Aug 15 19:55:46 EDT 2012 | hegemon

If you are doing X-Ray post place and pre-reflow you should be good. Look elsewhere. Check profile - full lead free or hybrid? Be sure you are acheiving the required reflow temps and TAL required for the solder paste too. Check for belt movement

SMT voiding

Electronics Forum | Thu Oct 25 13:33:18 EDT 2012 | cyber_wolf

Ken, The photo looks like results I have seen because the gold flash was too thick on the board. This causes a condition known as gold imbrittlement. You may want to get an analysis of the plating thickness. I'm not real experienced with immersion si

paper vs emboss (& zig zag placement)

Electronics Forum | Thu Oct 04 10:54:11 EDT 2012 | eniac

I have only one incredible idea: this is example of different speed of heat transfer of neighboring pads. I saw it two times during last years, but on lead solder pastes (Sn63Pb37). The reason of this mistakes each times we found two: 1. errors duri

safety?

Electronics Forum | Tue Dec 04 15:01:02 EST 2012 | davef

Here, the aim of using protective gloves in the SMT assembly area is to keep solder paste from operator hands for safety reasons. And sure, you make a good point, while you're trying to determine the correct material, it's a good idea that these glov

Training plan for SMT Operator

Electronics Forum | Mon Feb 04 17:26:06 EST 2013 | linhh98

Dear All, I'm asking for the complete training plan for SMT equiment operator who uses DEk solder paste printing machine, MyData M19 and the Flextronix Oven for the large scale production industry level. Could someone please recommend me what the re

Nano coatings ? PAPERS!!! ... We want papers!

Electronics Forum | Mon Mar 18 11:25:24 EDT 2013 | cyber_wolf

I was at an SMTA meeting Friday. One of the topics of discussion was nano coatings. 1. Nobody wants to talk about where the coating goes as it wears off. 2. There are different types of nano coatings : Chemically bonded which involves a special bon

QFP on going on square (now and again)

Electronics Forum | Tue Apr 02 13:43:54 EDT 2013 | ericrr

On one of the products uses a QFP (Quad Flat Package)which is not going on straight, maybe 20 pins per 4 sides. sometimes I have to tweak the alignment before the board goes in the oven, this practice can be a bit of a worry if you over tweak it - pa

Delta T

Electronics Forum | Mon May 20 19:24:59 EDT 2013 | hegemon

Well, you wouldn't want 100 deg difference from zone to zone, in that you would likely exceed your maximum ramp rate, for instance if Zone 1 was 90C and zone 2 was 190C. Over time a general guideline (rule of thumb) has emerged, max about 40 deg dif


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