Electronics Forum | Thu May 09 11:37:12 EDT 2019 | slthomas
I'm curious about what you guys do for Pb-free HASL profiling. We seldom see this finish (only on consigned boards or if they specify it directly, which is very rare) so we don't have a lot of experience. Certainly we get better results with high
Electronics Forum | Fri Nov 27 13:04:47 EST 1998 | Phillip Hunter
| Hi | I have been conducting my first reflow profiles. Most of the texts that I have read suggest soldering the thermocouples to a populated pcb. I am finding this very difficult. I have been using a high melting point (Sn5 / Pb95) solder and the
Electronics Forum | Wed Feb 17 15:56:22 EST 1999 | Tuffty
| Dear Al, | Are these reworked, double-sided boards? | | If you attempt to clean side #2 of double-sided misprint in a "spray" type cleaner, millions of solder balls can be broadcast throughout the same chamber as the populated side #1. Or, if thi
Electronics Forum | Thu Jan 09 11:29:41 EST 2014 | spoiltforchoice
Thermal profiling typically requires a profiling kit, this will include a thermally insulated datalogger that follows your PCB through the oven connected to a number of thermocouples which you might affix to your PCB using heat resistant tape or usin
Electronics Forum | Wed May 07 17:52:36 EDT 2008 | wayne123
I have these boards that are a four layer FR4 material, we had been running them for quite awhile with no trouble, and then they started delaminating, I checked my Reflow oven profile and I was barely hitting the temps required for our paste, we then
Electronics Forum | Thu Apr 15 20:41:22 EDT 2004 | Ken
There are ledgitimate reasons for checking furnace calibrations, but let me clarify what that is. 1. TC's are not necessarily calibrted. Not unless you need "absolute" accuracy. TC's operate against a (non-linear) standard +/- a tolerance. Most
Electronics Forum | Thu Jan 05 15:09:37 EST 2006 | grantp
Hi, What studies? Can you post a link? I am not sure what the difference is between a ceramic BGA that the high temp solder ball is not expected to collapse, and a lead free solder ball that's run through a lead process and also does not collapse b
Electronics Forum | Tue Feb 19 09:41:26 EST 2008 | slthomas
ECD sells the MOLE, and they sell both the Oven Rider and the Wave Rider to accompany it. The thing is, you can profile both an oven and a wave machine without either if you're willing to just solder your thermocouples to a board. The nice thing ab
Electronics Forum | Mon Apr 21 11:55:29 EDT 2008 | realchunks
"Disturbed" usually means some form of movement. I would think your leads are moving due to warp as the board exits the reflow zone. Not knowing your profile, I would suggest checking your profile. Make sure you have adequate "above liquidous" and
Electronics Forum | Fri Jul 08 09:30:35 EDT 2011 | kahrpr
Check that your pick and place machine is not pushing the part too far in the paste and squeezing the paste off the pad. Your profile could need modifying. In the case of the profile the solder paste can slump off the pads before turning into a liqui
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