Electronics Forum | Tue Sep 11 09:13:01 EDT 2001 | davef
Like most things in electronic assembly, this is not astrophysics. People have pasted boards, placed components, turned the board up-side down, run the board through a reflow oven, and generalized about which components: * Fall off the board. * Don
Electronics Forum | Sun Sep 09 14:34:50 EDT 2001 | darburch
Eric Whenever I see a board come out of the chipshooter missing parts the first thing to check is the support pins. However if you have checked table and part height I assume that you have also checked the pins. So the next thing to check is the vac
Electronics Forum | Wed Sep 19 16:02:14 EDT 2001 | fcouture
Pad Metallurgy Used: >Is your question about this targeting the current industry capability of using tin plating technology on such small >pad dimensions? Actually I should have asked for tin/lead plating (HASL) and yes it's to have an idea on capab
Electronics Forum | Fri Oct 05 13:11:42 EDT 2001 | darren jones
hi all thanks very much for the replys...gettin well into the swing of it now...been a few years since i used a calculator properly!!! I also have to do a project which i have to present and write up about. I would like to be able to do something
Electronics Forum | Tue Sep 25 12:49:58 EDT 2001 | Hussman
Been there - done that. Makes a mess on that 2nd reflow process- doesn't it!?!?!? This is caused by design. If the open via is located in the land area, it will flow thru the via and cause pumps on the opposite side. You can have your vias filled
Electronics Forum | Wed Oct 03 09:56:51 EDT 2001 | Claude Tremblay
Hello everyone We have a QFP-308 (0.20" pitch)on a board and we have a lot of opens after reflow. We checked our profil by installing thermocouples on the pads of the component and everythings seems OK. We checked the coplanarity of the leads and it
Electronics Forum | Fri Oct 05 18:59:53 EDT 2001 | Dan Steffler
I have had an issue where solder has contaminated gold plated pads (fingers) where it is not acceptable. The pads must remain perfectly coplaniar for a LCD zebra strip to lay accross them. Does anyone know of a way to remove the marriage level of s
Electronics Forum | Fri Nov 09 14:23:12 EST 2001 | vickt
You are correct...These are proprietary codes. Your best bet is to stick to the UCT-31. Other folks have tried to create a tool of their own, but have had little success. Universal Instruments offers component library conversion tools as well as patt
Electronics Forum | Mon Nov 05 04:59:59 EST 2001 | madreindeer
hi, I have found dull joint when I have done trial if boards and cooling too fast.Also with Nitrogen.Some of paste don�t like Nitrogen too much. Also I have seen this when profile is not hot enough or flux haven�t survived to liquidus point. I wou
Electronics Forum | Thu Nov 22 10:02:42 EST 2001 | Adam
Guys Has anybody had experiences with plastic glue stencils good or bad ? I also have a couple of questions : 1. Can I use the same aperture design rules for plastic stencils as I do on my metal glue stencils ? 2. How repeatable is a plastic glue st
