Electronics Forum | Mon Oct 20 11:44:41 EDT 2008 | jdumont
Good morning all, we have been having some random intermittent connections on some BGAs lately on ENIG finished boards. Can you take a quick look at this picture (link) and let me know if it looks like a possible black pad occurrence? The picture sh
Electronics Forum | Thu Oct 30 15:36:18 EDT 2008 | grantp
Hi, Sounds like your engineer does not know what he's doing. We have developed and built hundreds of thousands of boards with normal square pads for 0402, and we just use a 5 thou stencil with 5% reduction and it works well. Decoupling? What is tha
Electronics Forum | Thu Oct 30 21:06:20 EDT 2008 | ashley
Hello mickd, For Fuji practice, the primary tooling hole preferably be 5mm from the edge of the PCB (lower right hand corner). This is the reference X0, Y0 co-ordinates in the Fuji program where placing co-ordinates going LEFT will be -ve value & go
Electronics Forum | Tue Nov 04 07:50:14 EST 2008 | davef
Sure. Here's what you should do to apply repeatable amounts of flux on BGA during rework: * Squirt some gel flux on a plate or something like that that has a flat bottom and raised sides to corral the flux. * Cut notches into one edge of an old credi
Electronics Forum | Tue Nov 11 19:41:06 EST 2008 | gregoryyork
Thats the problem residual residue from HASL fluxes Lead free especially are worse.Very hygroscopic and out gass and produce dewetting as well over wave soldered boards especially. Leave iron on blown joint and will after several seconds fizz and pop
Electronics Forum | Mon Nov 10 13:27:07 EST 2008 | evtimov
Hi janz, you should be aware of everything. You are going to change subsystem on your machine. How much vacuum you need on the machine? Can you control the vacuum level with your system? Can you control the the system at all? Is it really much more
Electronics Forum | Mon Nov 17 09:47:25 EST 2008 | cisridn
I would not recommend doing BGA soldering with only a hot air gun. I have done it in the past, but the boards would eventually come back from the field because the solder joints did not form correctly and the BGA would have to be reworked again. I
Electronics Forum | Thu Nov 20 17:52:30 EST 2008 | orian
Hello Im a uni student trying to find out information on SMT. Ive just spent around 2 hours searching for SMT information and can not find anything. More i spend time trying to figure out how, im starting to think, this is not something you can do
Electronics Forum | Wed Dec 03 14:17:50 EST 2008 | muse95
I am not disputing that cotton gloves are a good idea. They can help protect a lot of parts and surfaces (if the gloves are kept in good clean condition, that is, but that is a whole 'nother thread topic). The fact of the matter is though, paper w
Electronics Forum | Tue Nov 25 11:58:31 EST 2008 | rway
Hello all, We are using z1850/60 machines. The APC test is damaging a 1.8V device on the board. The APC stimulates -/+3Vdc in fast mode. I understand the dangers of over-voltage. But what I need to know is how the part is being damaged when the ent
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