Electronics Forum | Sat Aug 15 06:29:40 EDT 2009 | abeasia
Help, experiencing discolor of a white solder resist paint after reflow of 250 degree, it turned yellow. Have tried many paints, no luck. Anyone knows one that wouldn't change color and holds the white nicely? Thanks for your support in advance.
Electronics Forum | Thu Aug 20 07:10:46 EDT 2009 | davef
Questions are: * On what portion of the second side of the board [eg, solder only, solder mask only, etc] do you see this white hazy residue? * Could you attach a picture? * You mention cleaning this residue. What have you used to clean the residue?
Electronics Forum | Wed Sep 01 08:05:28 EDT 2010 | sachu_70
Solder mask between pads in case of fine-pitched device footprint may not be a practical solution to implement. Cheers !!!
Electronics Forum | Fri Jun 01 09:18:35 EDT 2012 | signal
Try a simple solder mask. I use Chemtronics. A bottle is only arond $20 and is as easy to apply as it is to remove. A cheap, quick fix.
Electronics Forum | Mon Mar 26 16:33:54 EDT 2018 | jacobidiego
I realize that I wrote wrong. Sry The stencil of 0,1mm of thickness is printing 45% more volume. I know this becouse the SPI is setup with the stencil gerbers and the messurements have a median of 145% of volume. what do you mean with excesive sold
Electronics Forum | Thu Apr 23 08:41:31 EDT 2020 | mvargas
Hi, thank you both for answering. Unfortunately, due to volume and the components we repair it is not viable to switch to selective soldering. I already contacted TechSpray and they suggested that I switch to 2211, but I don't think it's going to ho
Electronics Forum | Tue Apr 28 07:22:46 EDT 2020 | stephendo
Are you watching for copper dissolution? At one place I was asked to check why we had no barrels with some PTH locations. It was being dissolved in the solder fountain during rework.
Electronics Forum | Fri Dec 03 18:04:52 EST 2021 | SMTA-64387687
Why don't you use peelable/washable solder mask on the SMT components next to the T/H pins? Then, you won't have to worry about keeping the tight tolerances.
Electronics Forum | Mon Aug 14 05:45:16 EDT 2023 | dimamalin
First, this is the result of bad printer setup. Adjust knife pressure, PCB gap, separation speed, tooling, and stencil cleaning. Pay attention to the coating of contacts pad and height of solder mask of PCB.
Electronics Forum | Mon Aug 14 13:08:00 EDT 2023 | dimamalin
Similar issues arose for me in cases where the contact pads of components were located below the solder mask level. Ordering a thinner stencil might potentially solve the problem.
