Electronics Forum | Wed Aug 27 13:08:30 EDT 2008 | vladig
Td - is the degradation temperature for a laminate (board), while Tg - is glass transition one. There is one more (even more important) - delta Tg. They characterize the quality of the laminate material. Regards, Vlad www.sentec.ca
Electronics Forum | Wed Aug 27 21:22:44 EDT 2008 | davef
While you're waiting for others to reply, here are a couple of previous postings from the fine SMTnet Archives: * http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=45013 * http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=50312
Electronics Forum | Thu Aug 28 09:45:48 EDT 2008 | leemeyer
What is the model of the machine, 1414, 1818 ?? What version of software are you running. There is probably a safety touch strip (yellow rubber strip)that is around the head and possibly the front sides of the machine. Check the connections and wirin
Electronics Forum | Fri Sep 05 13:49:04 EDT 2008 | gregoryyork
Tell the board shop to increase the cure temp of the resist as it is undecured especially if you have waxy/greasy resiues on the board and a brown tar like substence in the solder wave itself. If undercured then solder will not flow off the resist pr
Electronics Forum | Fri Aug 29 10:18:31 EDT 2008 | rrpowers
We saw this one time when we were trying to develop some lead-free product. It ended up being copper migration. Some of the pads had a brown discoloration and those that did would not wet very well. Your elemental analysis would have shown if ther
Electronics Forum | Wed Sep 03 16:15:30 EDT 2008 | blnorman
Elemental is by SEM/EDX. The brown coloration does resemble the 3 micron photo. Again, if I'm picking up copper (our Ag plating thickness requirements are 0.05 micron to 0.12 micron following IPC 4553), maybe we do have a porous silver plating.
Electronics Forum | Wed Aug 27 19:06:49 EDT 2008 | joojoo
I am looking for an advance level soldering hands-on skill training to do rework on SMT and BGA replacement in the San jose area, California. If you know any training school in the area, please email me directly,thanks. noorkota@hotmail.com
Electronics Forum | Mon Sep 08 12:43:15 EDT 2008 | linny999
hello, Try Allen at Attek LLC 970 443 9233 he should be able to help you out. Ian
Electronics Forum | Mon Sep 22 14:18:06 EDT 2008 | amt61114
Doug, Thanks for your response. I'm definitely interested. Please let me know if you did not receive the request for info that was sent to your email address.
Electronics Forum | Thu Aug 28 21:39:47 EDT 2008 | davef
Shelf life numbers don't mean dip. Are the parts solderable per ANSI/J-STD-002, Solderability Tests for Component Leads, Terminations, Lugs, Terminals, and Wires? If yes, go solder the parts. If no, get better parts from your supplier.
