Electronics Forum | Wed Feb 07 06:37:39 EST 2007 | mk
We have been processing a family of boards for 3 years. No issues. New PCB Vendor and the boards suddenly will not print very well. Sloppy printing definition. Closer inspection reveals that the soldermask is built up .0012-.0019 over the vias, preve
Electronics Forum | Wed Feb 07 07:36:11 EST 2007 | jax
mk, Should I read into the fact that you posted this on a sipad website? You could always add an etch process to you stencil design to gasket around the raised mask locations. It is currently done when additive etch's/trace's are used. The extra $20
Electronics Forum | Fri Feb 09 17:09:29 EST 2007 | flipit
I think it depends on the shield and how it is configured. If your shield has some openings and your placement process is good, you can try it and see how it goes. I place small shields on small PCBs (1" X 2") and have no problems. There are 20 mi
Electronics Forum | Tue Feb 13 14:33:16 EST 2007 | CK the Flip
So the moral of the story is..... these SAC305 BGA's were accidentally mixed in with a Leaded process, the profile couldn't get hot enough due to Tg and Td constraints on a known good QFP on the same board, and consequently, the whole assembly fail
Electronics Forum | Fri Feb 09 16:04:56 EST 2007 | tiucric
Firstly , we are installing an ipulse m4e smt machine later this year. If any are being used in your production process please let me know just how good or bad the machine operates, any advance of information regarding problems : placement , nozzles
Electronics Forum | Thu Feb 15 21:09:45 EST 2007 | Stephen- SMT engineer trainee
1. Can anyone tell me about the water absorption(wt%) among different PCB((i) RoHS, (ii)non-RoHS, (iii) Halogen free)), I am currently facing the problems of PCB blisters after reflow process. 2. Also, please suggest the baking period/time among dif
Electronics Forum | Tue Feb 27 12:45:08 EST 2007 | russ
Boy it is good to see the wave master back in action! I mean really guys, is Larry the only one here who knows that the lead turns into vapor in the oven and then in the cooling zones it falls back onto the board and creates the solder joints? P.
Electronics Forum | Wed Feb 28 11:43:20 EST 2007 | realchunks
Marcin, Think outside the box. If you are glueing the SMT part down, why not have an aperture cut in your stencil (or recut a stencil) between the SMT part and thru-hole. Wave solder hates SMT glue. This will get rid of your solder short problem
Electronics Forum | Tue Mar 06 07:18:26 EST 2007 | Rob Cass
I actually bought this tape directly from a disrupter of Saint-Gobain series M797. It was placed on 6" x 9" sheets to have unique conformal coating masking cut outs made. Took some effort to get the process worked out but all is well now.
Electronics Forum | Fri Mar 02 16:12:45 EST 2007 | peter
We are in the early stages of converting al of our customers to No-Clean solder. I expect some customers to have no objections, others I am sure will be concerned about the "residue." I know that chemistries have improved greatly and if the process i
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