Electronics Forum | Wed Jun 06 21:58:39 EDT 2012 | davef
Higher temperatures are the primary reason that there are more solder balls with selective soldering than in wave soldering. Possible causes are: * Solder mask type is the most important factor ... Solder resists becomes stickier at higher temperatur
Electronics Forum | Fri Oct 15 19:11:14 EDT 2004 | grayman
Hi, This discussion is really getting long. Fuji and other high speed mounter is great and better than small flexible mounter when it comes to speed.But, I rather suggest a modular mounter specially for subcon companies. Let say we combined 2 or 3 m
Electronics Forum | Sat Apr 17 17:08:22 EDT 2004 | finepitch
Russ has a hint by saying "too long of a soak at too high of a temp or being in reflow for too long/hot". I think the board should stay in the oven for 3-4 minutes, spending 60-90 seconds of which during reflow. in order to stay in the oven for 3 m
Electronics Forum | Tue Dec 28 12:59:34 EST 1999 | Justin Medernach
Edmund, Check your "Air Amp" settings or the equivalent on your oven. Sounds to me like they are probably turned up too high in the reflow zone and you are blowing the components off of the board when the solder goes liquidous. Regards, Justin
Electronics Forum | Thu Feb 04 04:16:56 EST 1999 | Joni Siipola
I'm researching SO-8 power RF device mounting methods. Possible mounting method 1. Via thru holes Still the thermal resistance of the PCB too high Do you have suggestions for mounting the component, PCB/?
Electronics Forum | Wed Aug 05 14:55:15 EDT 1998 | john
Probably should have been more specific. We want to do some stencil etching. Mainly for prototype work nothing too high volume. Thanks, Oh yeah, (Ben) and maybe a tattoo here and/or there.. Ha ha ...
Electronics Forum | Thu Nov 21 01:40:11 EST 2002 | ruimsig
The cause of grainy joints is either too high reflow max 225�C, 90 seconds or the reflow temp was tp low
Electronics Forum | Mon Dec 22 12:41:17 EST 2003 | Marc Simmel
No clean solder paste. One further observation ... the parts have a metal shell and are 'floating' high on the paste. Though there is wetting on the metal shell, it doesn't seem to sink as far as it should and this could be lifting the soldertails f
Electronics Forum | Fri Jun 04 15:51:13 EDT 2004 | pjc
Oh, and $9K to $12K is a good price for a block that raises pins up and down by air, don't forget the tips on the pins too. Its all high priced stuff. Value is the key I guess.
Electronics Forum | Tue Dec 28 22:29:14 EST 2004 | davef
Doesn't make sense. Either your: * Oven is not operting properly [attach your profiler thermocouple to the baffle of each zone with a screw to check] ... OR * Conveyor speed is too high ... OR * Profiler is defective
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