Electronics Forum | Thu Jan 13 17:46:04 EST 2011 | davef
We've never seen the defect that you describe, but in wave soldering-land blowholes usually are caused by moisture in the board that out-gasses through the too thin plating of through holes. * Bandaid fix: bake the boards * Long-term fix: Obtain boar
Electronics Forum | Thu Feb 06 14:47:50 EST 2003 | MA/NY DDave
Hi "some customers/designers want to have via holes to be present in the PCB pad, due to some belief that it helps in heat dissipation. " As I think about this I don't know exactly why they would be concerned. I can imagine in some exotic products
Electronics Forum | Wed Feb 05 21:05:38 EST 2003 | davef
Iman On your situation: As an earlier poster stated, your options are limited to opening you stencil aperture to compensate for the paste lost to the via. On your designer's belief that "it helps in heat dissipation": Could be true, but: * Hole wil
Electronics Forum | Tue Jul 06 08:48:11 EDT 2010 | Sean
Hi all, Is anyone used to encounter PTH(plated through hole) crystal component(Not SMT component) become malfunction when the environment humidity is more than 90%? It is happening here...It is very weird that crystal become OK when humidity is bac
Electronics Forum | Tue Oct 27 16:22:00 EDT 2009 | davef
It's not the first thing we think of in looking at your picture. First off, the lack of copper in the region of the red oval makes us think of a plating defect. We don't expect that moisture out-gassing through the barrel wall to show-up on opposite
Electronics Forum | Mon Feb 28 12:50:20 EST 2005 | russ
If you don't have Plated through holes you will not get any hole fill! There is nothing for the solder to wet to. Problem solved? Russ
Electronics Forum | Mon Feb 28 11:01:59 EST 2005 | jbrower
Hi Ing, Yes, slope of the conveyor is important. What type of assemblies are you having 50-75% fill on. Are they single sided? Plated through hole? Is this a recent problem? I'm more than happy to help, but I need more information. Best regards, J
Electronics Forum | Tue Jul 28 16:13:45 EDT 1998 | Steve Gregory
| Hello everybody. | Remember I posted some questions on the smtnet regarding placing the thru hole connector using paste and reflow(pin in hole). I have able to accomplish the process succcesfully.....but I have a problem. The boards are failing at
Electronics Forum | Mon Feb 28 12:17:49 EST 2005 | lyrtech
TO JAY: What type of assemblies are you having 50-75% fill on. - Capacitor, resistor Are they single sided? - Yes Plated through hole? - No Is this a recent problem? - Yes, first time, but we don't know how long it last. TO RUSS: What is your t
Electronics Forum | Tue Jul 11 17:25:31 EDT 2006 | flipit
Moon man was guy who contributed often to smtnet. He had a lot of experience behind him. He breathed nitrogen, drank flux with an occasional shot of 111 trichloroethane, and his lunch consisted of dump bucket vision rejects. He was originally crea
