Electronics Forum | Thu Feb 04 12:01:07 EST 2016 | g2garyg2
Hi Luis A white mask typically helps in the marking process since you are not reliant upon the PCB layers to create the contrast. Laser marking is really an etching process, so if your laser is set properly (power and focus) the goal with mask is to
Electronics Forum | Thu Aug 13 16:46:13 EDT 2009 | snsmt
Hello Everyone, I have noticed that everytime that we have ran a PCB with fine pitch components (or even 0603s), there are little white strands on the leads or on top of the components. It occurs on both lead and lead free solder. We usually soak
Electronics Forum | Tue Nov 04 12:58:17 EST 2008 | smt123
I have to agree with Patrick here. This image appears to show a board that is NOT HASL as there is what appears to be a copper pad in the upper portion of the image. But then again the arrow tip appears to be white and I woudl expect that to be red s
Electronics Forum | Mon Oct 08 23:17:48 EDT 2001 | Brad Arnold
We are trying to produce a PC Card bus assembly with a 672 pin BGA on one side. These pcb's are .015 thick. I believe the ball pitch is .5mm. The pcb's are plated with white tin. The pcb's are in a 1 X 3 array. We had 2 plates with appropriate cutout
Electronics Forum | Thu Oct 11 17:44:30 EDT 2001 | aaelect
OK, OK. 672 ball BGA. The pcbs are PC Card bus size and are .015 thick. There are 3 on a panel with about 1/2" between and rails. The aluminum plates are about 3" by 7". There are 3 cutouts which allow for the parts from either side to protrude du
Electronics Forum | Mon Jul 26 14:14:51 EDT 1999 | Steve Gregory
| | | We are having a process related problem with pullup resistors on a controller card which has a I960 micro-processor. | | | The controller monitors signal inputs and it's own resources then blinks a LED to indicate its working. The problem is th
Electronics Forum | Fri May 11 11:52:25 EDT 2001 | jagman
Does anyone know what would cause a PCB to develop white spots all over the board following parts placement and reflow? I need help!!
Electronics Forum | Fri Nov 15 11:12:15 EST 2002 | V.RAMANAND KINI
I have tried this white s/m coating. I want some thing better. I am looking at a metal frame cover over the PCB or leave the PCB surface with HAL avoiding soldermask. Will this HAL withstand -40 to +85 deg?
Electronics Forum | Sun May 13 21:02:34 EDT 2001 | djarvis
Gary, You're not trying to clean these boards with Iso or other solvents after using no-clean solder paste? That'll do it.
Electronics Forum | Thu Nov 14 12:46:51 EST 2002 | dphilbrick
Most people I have seen use white coat mask. This works very well in LED signs and such. Doug
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