Electronics Forum | Thu Jan 29 11:30:56 EST 2009 | rgduval
As others have said, you'll have some difficulties getting good reflow on pb-free out of a 3-zone oven. We did it with a 4-zone for awhile, but only had really good success on low thermal density boards. That said, you should definitely check your
Electronics Forum | Thu May 14 13:25:14 EDT 2009 | cyber_wolf
Me thinks generic profile + desktop and laptop computer boards= not happy time. Attach thermo-couple to appropriate location on said part/pcb. Make profile same as solder manufacturer / component manufacturer spec. There is no magic heater set poin
Electronics Forum | Tue Aug 04 17:17:17 EDT 2009 | gregoryyork
Certainly does look like solder deposit across the board. Check to see if fluxing correctly. Best way is to hand flux the PCB ensuring you put plenty on. IF you still get the same result then probably down to resist absorbing the flux due to porous r
Electronics Forum | Thu Aug 13 19:30:57 EDT 2009 | secura1
I'm new to all this... we have a board with one BGA blue tooth device. one test for the board is an rf test that measure successful packet transmission. we find that we get much lower error rates if we "reflow" the BGA with a heatgun. We do this
Electronics Forum | Mon Sep 21 15:45:35 EDT 2009 | boardhouse
Hi Ryan, Standard shelf life for FR4 Non-RoHs & Rohs material with HASL or Lead Free HASL would be 12 months + in a controlled environment. on all RoHs materials over 6 months, we would suggest your board shop run a solder ability test before ship
Electronics Forum | Thu Oct 01 08:34:50 EDT 2009 | davef
First, the reflow thermal recipe provided by your paste supplier is only a ball park guess. Beyond that, the temperature measured by thermocouples on your oven heaters are only loosely related the temperature of solder paste on your board. You need t
Electronics Forum | Sun Nov 01 01:33:52 EST 2009 | isd_jwendell
Just my opinion: Top pic - Solder mask registration WAY too far off, without a doubt I would reject. Bottom pic - I would worry that there was/is a contamination that caused the poor looking mask. This may be cosmetic only, but unknown. I would rej
Electronics Forum | Tue Nov 24 05:23:18 EST 2009 | prodivegsr
Hi Davef, Thanks...Saw 1 of your thread that you posted : Thanks for providing... From davef : There are many possibilities: * Conformal coat is incompatible with surface residue on the board * Conformal coat is incompatible with solder mask on the
Electronics Forum | Sat Nov 21 09:39:01 EST 2009 | patrickbruneel
Dave, I would only agree with you when you talk about low residue (water based) fluxes. In low residue (alcohol based) fluxes you can use non water soluble acids, so in the event you still have flux residues on the board water has no effect on them.
Electronics Forum | Thu Dec 17 18:08:41 EST 2009 | lynn_norman
Back in a former life, we had 3 products that were PCBs bonded to aluminum boards. We used a PSA from 3M to bond the board to the aluminum. Polymers are almost invisible in x-ray, but ultrasound worked quite well. You should try CSAM. Don't know
