Electronics Forum | Fri Feb 09 16:11:31 EST 2007 | MAC
Not an expert on PCB manufacture, but it looks like mask from other side of PCB flowed through vias before this side was masked. Is it possible previous vendor masked this side first, or used film-type mask which would not flow through?
Electronics Forum | Tue Feb 13 11:45:27 EST 2007 | realchunks
If you're using vaccuum to hold the board, too much vacuum can cause bad print. This generally occurs during snap off. You can either decrease snap-off time of reduce vacuum.
Electronics Forum | Wed Feb 07 11:27:25 EST 2007 | asoe
I just wonder anyone had the idea of solderability test for through hole by using a wetting balance equipment? I read the jstd002/003 however my feel is now our machine (metronelec st60) is not capable of this test?
Electronics Forum | Wed Feb 07 15:18:16 EST 2007 | dphilbrick
Tintronics in Huntsville AL can do this. PS I use them all the time for various services. I have no affiliation with them other than being a customer.
Electronics Forum | Thu Feb 08 15:47:08 EST 2007 | realchunks
We use 1 to 1 aperture on a 6 mil stencil, no problems. Do not over print unless your board resist allows you too.
Electronics Forum | Thu Feb 08 23:00:39 EST 2007 | davef
Roland How will the registrations that you propose be different than the registrations that SMTnet currectly uses? Will currently registered users be required to reregister? Will the forum be available to nonregistered lurkers on a read only basis
Electronics Forum | Thu Feb 08 14:15:45 EST 2007 | dwelch
Dave, I had the same problem in the past. Use fresh paste and a slightly higher profile. My guess is that you may not be completly reflowing. It worked for me. If that doesn't work you may want to check the bga itself, make sure balls are universal.
Electronics Forum | Mon Feb 12 02:17:32 EST 2007 | Wayne
Most of the semi-con is using SAC305 balls. Only the PCB assembly house feels the heat, but semi-con never feels any pressure.
Electronics Forum | Fri Feb 09 10:56:26 EST 2007 | realchunks
Sure is. It's called Dual Pot. Most major wave solder manufactureres offer it. The quickest way is to buy a used wave for Pb and keep your existing Pb free wave, Pb free!
Electronics Forum | Mon Feb 12 12:52:48 EST 2007 | stepheniii
Would their calculatoromiters set off my BS detector? It's quite sensitive with things like Cp,Cpk and use of statistics. Or are they actually genuinely usefull?
