Electronics Forum | Wed Dec 11 06:29:20 EST 2019 | ameenullakhan
Dear Javi, Thanks for the feedback and review. Sorry i was bit busy. Yes the issue is minimised, but not eliminated. We have tried with reducing the vibration source in chain conveyor of oven. Our board is having parts very next to each other. O
Electronics Forum | Wed Aug 07 01:41:27 EDT 2019 | orbitcoms
Hi I am having trouble getting solder bridges on TQFP-100 (0.5mm pitch) components. The boards are pasted on semi-auto printer using laser-cut 0.12mm stencil and SN63 NC257-2 T4 paste. The components are placed using Samsung CP40LV and tghen reflow
Electronics Forum | Thu Aug 08 22:41:30 EDT 2019 | orbitcoms
The pick n place height for component was set to 1.4mm but I had not allowed for pin thickness. I added this (total height now 1.6mm) and I get very few solder bridges now. I might try 1.7 and see if it makes any further differnce
Electronics Forum | Mon Aug 12 12:09:37 EDT 2019 | davef
First, companies should nor be venting solder process fumes into the workplace. Second, you should see medical attention, as Alexy suggested. It doesn't matter what caused you to get sick. Get fixed. Third, if your ex-employer is venting soldering
Electronics Forum | Thu Nov 07 21:28:31 EST 2019 | sssamw
The connector is so long, and has big metal parts, it will be little deformed during reflow I guess, andthe pins planarity should be critical for 200 pins. Did you measure the non wetting pins profile to see if temperature ok? And maybe you can try u
Electronics Forum | Wed Nov 20 09:23:53 EST 2019 | alpha1
We had a board we fought with for a while with solder balls. Checked everything, Stencil thickness at .004, reduced apertures, changed paste 3 times, changed profile 3 times. Finally changed board vendors. Went from HASL to Emersion Gold. Problem sol
Electronics Forum | Fri Nov 29 10:26:01 EST 2019 | marwan
flux my leave a white residues even after cleaning, when we want to select a flux for our Ersa Ecoslect we tryed a varity of fluxes (including the IF2005C) and we decide to use the Cobar 390-RX-HT because he gaved us the best results in soldering and
Electronics Forum | Fri Nov 22 16:59:43 EST 2019 | dwl
I'm worried about the voids that you have on the heel fillet of the leads. Off the top of my head, I don't recall if/what the IPC spec is for voids in gull lead fillets is but my gut instinct is that you're compromising the mechanical strength of the
Electronics Forum | Fri Nov 22 05:04:07 EST 2019 | SMTA-Matthew
We have some circuit boards where the solder mask seems clear instead of green on top of some of the tented via pads. No gold deposited during the ENiG process and no solder sticks to it but why is it clear and does it have any correlation to the thi
Electronics Forum | Thu Dec 05 11:40:36 EST 2019 | slthomas
That's a good point, although hand soldering a xfmr on a RoHS assembly isn't going to be a walk in the park. My other question would be did it fail because it got hot, or did it get hot because it failed?
