Electronics Forum | Tue Oct 02 07:23:37 EDT 2001 | cath
Has anyone caried out a DPM analysis on these components. I would be interested to know the defect rates and other assoc. placement issues as we have never placed them before. Thanks, cath
Electronics Forum | Thu Oct 04 19:35:41 EDT 2001 | KBerry
You could try an off the shelf solution such as Tecnomatix-Unicam's Quality System. I believe they allready offer this functionality plus many other features that you may find interesting. KB
Electronics Forum | Wed Oct 03 17:52:37 EDT 2001 | mparker
I hate it when that happens. Usually I just buy a better brand of papers. Zig Zag works best. Of course, you gotta remove the stems and seeds, those are the most recurring sources that cause an open joint.
Electronics Forum | Wed Oct 03 21:28:38 EDT 2001 | davef
A firm grasp on the sublime. Mike points-out a good reason to describe Claude's problem as "open connections" or "open solder connections"? [Ahhh geez, wut a spoil spurt]
Electronics Forum | Thu Oct 04 12:48:09 EDT 2001 | vance
Overwetting is also a root cause of open joints. I recommend eating 5 saltines in 1 minute for anyone experiencing overwetting.
Electronics Forum | Thu Oct 04 13:04:52 EDT 2001 | Hussman
Without seeing your X-ray, it sounds like your BGAs are out gassing. This casues the situation you described. Try baking some BGAs and run them along with ones not baked to see.
Electronics Forum | Fri Oct 05 07:31:29 EDT 2001 | furrer
When tenting vias almost a few vias are not covered completly by Solder Mask. Does this one side open vias affect the Immersion Tin Process ? Do we get chemical residues in the vias ?
Electronics Forum | Fri Oct 05 09:15:23 EDT 2001 | Ben Bierlein
It is a PCB material that has a woven glass / epoxy internal core and glass veil surface. It is in between the paper materials (FR1,FR2 and CEM1) and FR-4 as far as strength and cost. It is available in HiCTI material for high power applications.
Electronics Forum | Sat Oct 06 08:42:21 EDT 2001 | davef
Please give us additional background on your board, solder, process, etc. If you are talking about black pad in ENIG solderability preservative, check the fine SMTnet archives to get started.
Electronics Forum | Sun Oct 07 07:58:32 EDT 2001 | davef
Consider searching the fine SMTnet Archives for the names of companies that offer such training courses and giving them a call to determine their schedules.
