Electronics Forum | Wed Nov 06 20:18:30 EST 2002 | davef
cvrgrrrl Your first thermal cycle with imm silver should be the easiest to solder. That you see copper indicates you did no soldering, got no wetting, produced no intermetallics, etc. Tell us again which components did not solder? Wuzzis "plug" t
Electronics Forum | Thu Nov 14 09:43:33 EST 2002 | MA/NY DDave
Hi I will only hit only a few and then bug out. Worked with one large EMS place that has the "fail first" approach to engineering and manufacturing. ( I know I know THEY all do). They didn't store the paste as the mfg suggested, they didn't control
Electronics Forum | Thu Nov 28 20:37:40 EST 2002 | Dreamsniper
I'm in the process of generating work instructions for our stores and production process with regards to moisture sensitive devices.And I'm a bit confused. I found out that we have many TSOP's, QFP's and BGA parts in sealed bags that have not been op
Electronics Forum | Wed Dec 18 19:52:25 EST 2002 | kennyg
Problem: A SMT fine pitch or BGA component needs to be baked due to MS concerns and is needed in a hurry. In some cases the packaging will not allow a high temp/short duration bake. Production will not allow a low temp/long duration bake. If the part
Electronics Forum | Fri Feb 28 08:57:34 EST 2003 | davef
We used to bake [100*C for 6 hours] all of our boards, but no longer bake at all. Before going off, your bake recipe is probaly OK. If anything, it's probably too short. Consider measuring the weight of wet boards, baking for a time, measure, bake
Electronics Forum | Tue Mar 04 18:49:06 EST 2003 | scifi97
Hi Mike, I have had a number of contract manufacturers, and SMT equipment makers looking at using our SPC software to monitor process control on SMT machine production with the data coming off the vision check machines. (There seems to be a huge sur
Electronics Forum | Fri Mar 21 10:16:00 EST 2003 | O'Connor
Hi, Is there a standard that covers the shelf life of PCB's? I need to know, how long after manufacture a PCB can be stored in an uncontrolled envoirnment exposed to the atmosphere before being built on, currently we say 1 year, but nobody really kno
Electronics Forum | Mon Jul 07 11:45:45 EDT 2003 | lromero
Do you know what the maximum temperature rating is for the devices. But in my past experience you could be seeing the following. Excess thermal ramp rates typically you would like to see 2 to 3C/sec in the reflow oven, if it is greater than this i wo
Electronics Forum | Mon Nov 17 07:07:55 EST 2003 | stefwitt
The version numbers of the software are not the same. There are too many software versions out there to tell you the right match. Some of the latest software requires firmware upgrade on the axis control cards. If you go by the release date, the sta
Electronics Forum | Sun Apr 18 05:02:53 EDT 2004 | Rob
Hi, I am a Quality person (Metalwork fabrication and System assembly)but have not had any experience of SMT before. I am trying to put some SPC in place for reflow and others and have come across something I do not understand. Our current SPC Chart c
