Electronics Forum | Fri Sep 13 13:58:06 EDT 2002 | soupatech
Hey Thanks! Yep, they are pricey but I think it would be a worth while expense to safegaurd $250,000 worth of leds! I will tell the powers that be and see if I can squeeze out some cash. If I scrap one loaded board could I use it for profiling 20 to
Electronics Forum | Fri Sep 06 14:07:20 EDT 2002 | ppwlee
Thanks for all replying to my printing SPC posting. I like to expand the SPC discussion on reflow and wave soldering. I am aware of the common methods of applying periodic measurements using test vehicles though the machines to collect critical pr
Electronics Forum | Wed Sep 11 12:52:14 EDT 2002 | slthomas
We have found that using the SPC capability of the profiler's pc software helps us identify oven malfunctions sooner than we would normally find it. The ovens tend to compensate for dieing or dead blowers by cranking the heaters on for longer cycles
Electronics Forum | Mon Sep 09 21:02:30 EDT 2002 | davef
Bernard Interesting point. Please help us better understand: * Why do 'VIA hole, PTH hole sizes may need to be changed', aside from the obvious with hole-to-lead clearance? * What should the designer 're-evalaute the board before changing'? * What
Electronics Forum | Fri Sep 13 14:35:03 EDT 2002 | davef
Thanks Bernard. On your profile: Adding gold to your solder alloy will increase the liquious temperature. So slowing your reflow oven conveyor is a perfectly reasonable approach, especially for pads with low surface area. We don't even notice a di
Electronics Forum | Tue Sep 10 07:24:13 EDT 2002 | John
I need teoretical info for theme "Matted surface vs solder ball". Is it right that some solder pastes decrease solder balling but give matted surface after reflow? That diference between these pastes and others? Are the matted surface worse solder b
Electronics Forum | Thu Sep 12 09:12:22 EDT 2002 | mhoughton
I have printed and placed similar devices in high volume with exactly this spec for a couple of years with no problems, are you using laser cut stencils and what type of solder paste are you using? and what is the end use of the product as it may nee
Electronics Forum | Thu Sep 12 09:15:29 EDT 2002 | mhoughton
I have printed and placed similar devices in high volume with exactly this spec for a couple of years with no problems, are you using laser cut stencils and what type of solder paste are you using? and what is the end use of the product as it may nee
Electronics Forum | Wed Oct 09 08:44:05 EDT 2002 | apg
Dear colleagues. I ask you to prompt me about necessity of drawing pastes through a stensil at the soldering micro BGA with step between leeds 1 mm and 0,8 mm or uses only a flux for this purpose. And what most suitable paste for the soldering of su
Electronics Forum | Fri Sep 13 09:02:52 EDT 2002 | tvielhaber
A distributor has some smt components (QFP) packaged in a vacuum sealed package with a 1991 date code. Should I accept these parts? What are the main issues I need to be concerned about? Solerability, moisture? Won't the vaccum seal package minim
