Electronics Forum | Fri Jan 21 06:35:51 EST 2022 | stivais
"Manual washing" of a misprint board basically is smearing of printed solder paste all over the board. And trying to remove (wipe off) it afterwards. So for me it would not be any surprise that the solder paste ended up on the pads where it was not i
Electronics Forum | Fri Jan 28 13:49:48 EST 2022 | jseewald
That is correct. This looks like a board that was printed then wiped but not washed. Solder spheres left out on an unsolderable surface will just sit there like this or coalesce into solder balls. Nothing in the picture indicates an issue with the
Electronics Forum | Mon Jan 24 11:17:30 EST 2022 | jineshjpr
Hi, Mainly concentrate on 2 subjects: 1- Cleaning of Misprinted PCB (always use best neutraliser to remove paste from PCB), 2- Underneath Stencil Cleaning - Use good stencil cleaner (rather than IPA) to wipe your stencil. Because both the above said
Electronics Forum | Fri Jan 21 12:36:52 EST 2022 | stephendo
Like I said a lot of people don't tape the gold fingers the first time they run them. After that they make sure the fingers get taped up because solder gets places you don't think it does and once it touches gold, that gold is contaminated. How do y
Electronics Forum | Thu Jan 20 21:29:48 EST 2022 | stephendo
Copper gets etched in a photographic manner. ENIG is an additive process. Nickel gets added then gold gets added on top. Therefore it is not a matter of over etching. It is a matter of not enough gold added. The layer of gold ideally is as thin as po
Electronics Forum | Thu Sep 30 15:46:22 EDT 2010 | vetteboy86
Hi Folks, I'm looking for detailed information about the different composition of circuit board pads. We have been experiencing some issues with our solder, and I would like to know the differences between compositions. I do know that we ran a cust
Electronics Forum | Wed Oct 06 04:11:35 EDT 2010 | grahamcooper22
I've done minimal research to this point and > understand my issue with solder on the double > sided boards is due to oxidation that occures on > the unpopulated pads when the board makes its > first trip through the reflow oven. > > We did run
Electronics Forum | Tue Jun 22 11:14:03 EDT 2004 | Steve Thomas
A very quick survey regarding PCB finishes for a lead-free process. What is the most popular PCB finish for lead-free soldering ? Who drives the selection of the finish, assembler or designer ? Are tin whiskers an issue for anyone ? I'm coming at th
Electronics Forum | Tue Jan 23 20:57:12 EST 2007 | asir
Can some of you kindly share some of your experiences with PbF PCB finish (OSP, ENIG, Immer Sn, Immer Ni,etc.) What are the benefit and disadvantage? Some of the issues that has been encountered. Which one you would recommend?
Electronics Forum | Mon Aug 08 05:20:37 EDT 2005 | jim
Ted, Is your pcb problems after reflow process related to the change of color of the pcb to yellowish? I have such problem when running thru' the pcb under ROsH condition. This pcb does not change color previously when running under non-ROsH condit
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