Electronics Forum | Mon Oct 27 05:35:33 EDT 2014 | grahamcooper22
Are you doing PIN IN PASTE (intrusive reflow) ? If so, then paste can be dripping through the pcb holes and onto the oven bottom heaters / baffles . Or, if any of the SMT pads have vias in them, paste may drip through them if they are not sealed. Whe
Electronics Forum | Fri Aug 06 03:21:56 EDT 2004 | ram
What will be the impact on the plating if the moisture outgas thru the PTH?Can the plate get damaged?
Electronics Forum | Wed Aug 18 21:25:37 EDT 1999 | Tony Yang
| WE ARE CURRENTLY HAVING PROBLEMS REFLOWING BOARDS WITH WHITE TIN PLATING. WE ARE NOT GETTING GOOD WETTING ON THE PADS. | WE HAVE CHECKED THE REFLOW PROFILE AND TRIED DIFFERENT PASTE'S. | WE THINK THERE MAY BE CONTAMINATION OR OXIDATION ON THE PADS.
Electronics Forum | Thu Jan 06 08:03:47 EST 2005 | davef
On solder in vias: It looks like the via are not solder masked well and pick-up solder either: * Solder coating ... OR * During leveling It's possible that the design specifies openings in the solder mask for these via. On solder in the unsupporte
Electronics Forum | Tue Aug 25 03:24:11 EDT 2009 | fiona_j
Hello, I have been recently bringing a new RoHS wave soldering machine into production. Unfortunately, I am finding many of the boards are experiencing blow holes. It is always silver plated PCBs and I believe it is related to moisture ingress. I n
Electronics Forum | Mon May 14 14:51:36 EDT 2001 | Brian W.
Personally, I prefer the OSP. I get a flat surface to deposit paste on, resulting in more consistent solder paste volumes. With HASL, the amount of plating and the mounding affect the paste deposition. I have even had it affect the placement. The
Electronics Forum | Mon Jun 07 12:22:44 EDT 1999 | Chrys Shea
| I'm encountering a new problem at my new company that I haven't encountered before in my past life - and that's Wave Soldering VIA holes. | | We've been getting a rash of defects that we call in this company, "insufficient solder in VIA hole." The
Electronics Forum | Fri Oct 12 13:40:56 EDT 2001 | Steve
I need help with a process issue. I am dealing with a board design that is double-sided SM with a couple high density through-hole devices. I want to flow solder the through-hole stuff, so what is the best way to deal with them? Since one of the thro
Electronics Forum | Mon Mar 05 09:12:58 EST 2018 | proceng1
If it's a plated hole though, you can use the ring around it, which should be as accurate as a copper fiducial. just know that any plated hole with a trace coming off of it will have a "tail" and it might throw the computer off when scanning.
Electronics Forum | Fri Feb 23 10:24:24 EST 2001 | johnthor
We still build a legacy product with a primitive backplane using silver plated fork terminals for outside world connections. After some 20 years of no problems the fork terminals on raw stock PCBs were black and almost unsolderable. Because of the
