Electronics Forum | Mon Sep 05 01:38:12 EDT 2005 | plcc
I hv a PCB (mtrl is RF35). After going thru' reflow, we found yellowish stain on the solder pad (solder mask). It looks like burn-marks. The reflow temp use is 245oC. We tried running bare pcb under 220oC, there's minimum stain found (acceptable),how
Electronics Forum | Tue Sep 06 09:20:50 EDT 2005 | Bob R.
We approached it the same way we select SnPb pastes. We started by doing coupon level tests to sort out the obvious "bad" pastes: SIR, wetting, solder balling, print quality, etc. That cut the field in half. From there we started to do assembly l
Electronics Forum | Wed Sep 07 04:28:26 EDT 2005 | Slaine
were looking at paste, wire, preforms and solder bars (for solder pots), concentraiting on HMP, sn62,96S, and 2 different sac alloys, we also have 7 different fluxes and 16 temination inks (which were also having to change for RoHS because the ink co
Electronics Forum | Thu Sep 08 01:58:08 EDT 2005 | darby
0. Any less and you are scooping the paste from the aperture with the squeegee blades. I'm not saying that either of these situations is a good or a bad thing, it's just that if you buy a 6 mil stencil, you are trying to achieve 6 mil paste height.
Electronics Forum | Thu Sep 08 11:56:37 EDT 2005 | siverts
I have seen this before. Sounds like that You are having problem with the vision box, located in the rear left of the machine; that is if you are using the old vision system, the newer Lantern vision card is located in the VME chassi in lower front r
Electronics Forum | Thu Sep 08 06:19:55 EDT 2005 | lupo
Hello, Could anyone provide some support concern issue with vertical fill of through hole solder. Our lead free wave soldering process is not capable to fill 100% (requirement of our customer)through hole. We made everything (DoE) - different amoun
Electronics Forum | Wed Oct 05 06:10:41 EDT 2005 | lscontrol
Thanks for the help so far. But i still have problems, do to the downloaded version of Cad2Cad ver. 3 which does not have any save as/export/import or open file-posibilities which support vios, csv or txt-files or anything like it. I downloaded the
Electronics Forum | Wed Sep 14 23:16:58 EDT 2005 | Author
If it is necessary to define the type SMD semiconductors on its code of the marking (marking code, top mark) - visit the site (no www!)http://users.zebratelecom.ru/~smd_marking The having read article "rules of the marking" you get the full pres
Electronics Forum | Thu Sep 15 03:07:15 EDT 2005 | LeeHoMa
hi All, I am new to this forum and got a technical problem as below. Please see if anybody can help to solve it: I am currently producing one PCB board with 2 side SMD parts and all AI component in 1 side. I try to have both side SMD part soldered(
Electronics Forum | Thu Sep 15 22:00:17 EDT 2005 | LeeHoMa
hi Stephen, Thank for your comment! Yes! My people also share the same view that customer is asking something which is in more theoretical side. They want us to collect a lot of statistical data to prove our process. Anyway, customer is not only
winsouce.jpg)