Electronics Forum | Fri Jul 28 09:20:10 EDT 2006 | pavel_murtishev
Good afternoon, No, defects aren�t trace related. I�ve just posted reflow profile (reply to Chunks). I suspect the component only. All other components are fine. But I can�t understand what exactly happens with this component. I tried to play with s
Electronics Forum | Tue Aug 22 18:15:50 EDT 2006 | russ
okay so both the 2005 formulas from interflux are clear alchol based fluxes. Yellow res huh? In looking at the temps here, I would say you might be too hot at both preheat and solder temp. You may be burning flux. How long is dwell time over wave
Electronics Forum | Tue Sep 12 19:36:17 EDT 2006 | davef
We've been soldering leadfree components for maybe 15 years. We'd be surprised not to be able to store components for at least a year, not that we purposely do that. Component fabricator process determine the maximum storage time for components. M
Electronics Forum | Wed Sep 13 08:57:34 EDT 2006 | russ
yep, steve is right, it was kind of a joke but I have attached nuts and bolts to QFPs when it was deemed that a lot of components needed to be removed from some assemblies in a quick amount of time. Fit just means that it will fit onto part. thought
Electronics Forum | Fri Sep 22 11:42:07 EDT 2006 | Steve
I agree with one of the previous posters that phpbb is a great forum software. Tons of features and it's easy to manage. I also believe that we are very fortunate to have this free forum. I've grumbled under my breath a few times about the load times
Electronics Forum | Thu Oct 19 08:48:32 EDT 2006 | stepheniii
Time is also a factor, usually. IIRC almost everytime I"ve seen a max temp rating it also included time. ex. 225C for 20 seconds. If a part can take 300C but the spec sheet says 220C and you take it to 225C, it doesn't matter if the heat made the pa
Electronics Forum | Tue Oct 31 01:32:47 EST 2006 | hanocete
thanks for your reply, actually we bake the PCB assembly prior the rework because the package was exposed for quite some time already. The baking time was 24hrs @ 125 deg.C. We notice that there were flux residues on the connectors after the baking.
Electronics Forum | Thu Nov 16 11:11:56 EST 2006 | jhaviland
I have worked with both Mirtec and Yestech and you really can't go wrong with either, they both have a good support group if you need it. by my take on the 2 is that yestech is a little less comprehensive inspection wise and a little slower than Mi
Electronics Forum | Wed Jan 03 16:52:19 EST 2007 | Pete
What is a foolproof means of eliminating moisture content from Printed Circuits that arrive (bot hpurchased and consigned) in unsealed, non-dessicant packed bags? Als, is there a procedure for basic mass of boards vs. temp/cure times? I need to min
Electronics Forum | Mon Jan 22 02:35:57 EST 2007 | AR
Thanks for the info everybody. As Real Chunks stated, a lot of paste is needed in order to solder the clinched part of the lead on to the pad. It can be done with a dispenser but it takes a lot of time. The good part is that the result looks surpris
