Electronics Forum | Wed Oct 09 16:19:54 EDT 2019 | cbart
We have draft/vent booths for our folks, we had a local company here make them for us with Black lights built in. they work nicely there is a constant draw. We also had the same company build drying cabinets, they have constant draw/ventilation on th
Electronics Forum | Tue Jan 31 15:52:39 EST 2006 | russ
I have never related Solder mask layout to Black Pad. I don't see how they could be related but.......
Electronics Forum | Wed Jan 25 00:46:09 EST 2017 | cmarasigan
Our Stencil Mask Fiducial vanishes from black color to light where our Screenprint machine unable to detect fiducial during batch teaching (auto set-up alignment). Does anybody here encounter the same problem? I am searching for a dark marker or any
Electronics Forum | Mon Mar 05 16:16:08 EST 2007 | Mark
Hello, We are having issue with one of the customer board. This is 10 layer PCB FR4 with black solder mask. Coating Ni/Au. Soldering leadfree. We are using 7 zones air reflow oven (zones top&bottom). We have bed solder flowing for this boards. T
Electronics Forum | Fri Apr 16 13:22:48 EDT 2010 | stepheniii
Have you tried running a few bare boards through the oven? If there is no flux on them and you still get the "stains" then I think you can eliminate the flux as the cuprit. And I've been told that white is the second most difficult solder mask colou
Electronics Forum | Fri Sep 11 15:27:50 EDT 2015 | u4bga
Hi! We're noticing white spots on 2 PCBAs after the selective soldering & DI Wash processes. ----Facts---- 1) The marking is on all boards, irrespective of date code 2) It only happens on leads that have been selective soldered 3) The pattern of w
Electronics Forum | Wed Jan 25 07:24:31 EST 2017 | emeto
Hi, I used black marker before and it will works for a while, but it is not a permanent solution. Ask stencil house what kind of material and process they use to apply the black material. I think this operation might be done manually after the stenc
Electronics Forum | Tue Sep 27 08:22:27 EDT 2005 | Amol
I am using masking tape, the 3M high temp blue masking tape. the problem though doesnt seem to be related to the masking tap as i am seeing pin holes and eventual dewets over entire ckt board (its almost as if the board has chickenpox under black lig
Electronics Forum | Tue Oct 14 10:33:27 EDT 2008 | martinouk
We use masking tape - cheap as chips although you do have to replace it after washing. I have in the past used BLACK TAK from loctite. It was extremely expensive, and was supposed to be permenant. But after two/three washers through the cleaner it ne
Electronics Forum | Thu Feb 14 17:40:34 EST 2013 | jorge_quijano
PCB Supplier made an EDX anaysis, the found a chemical trapped in the holes, and some burnt burrs, according to what they say this stains are over the solder mask & silk, so they do not affect functionality.
