Electronics Forum | Thu Apr 22 18:07:38 EDT 1999 | Tom B.
| On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although when
Electronics Forum | Thu Apr 22 20:26:39 EDT 1999 | Dave F
| | On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although whe
Electronics Forum | Tue Aug 02 12:05:37 EDT 2016 | ttheis
Leave a circular area around the fiducial without any mask so bare board is shown.
Electronics Forum | Tue Aug 02 12:11:01 EDT 2016 | ttheis
Like this:
Electronics Forum | Wed Aug 03 12:20:21 EDT 2016 | proceng1
Sorry, Acculflexs
Electronics Forum | Sun Aug 23 11:42:01 EDT 2009 | ysutariya
Hi Dave, I haven't tried the Probimer yet, but the Taiyo ink didn't hold up too well. As a PCB fabricator, finding a white soldermask that has good trace coverage and survives 4X solder immersion (HASL) is like the holy grail of white soldermask.
Electronics Forum | Fri Sep 18 09:25:16 EDT 2009 | ysutariya
There's not really a good answer except that I think that the industry wasn't really prepared for such an increased use of white soldermask combined with the importance of using the white as a reflecting surface. Essentially, the resins commonly u
Electronics Forum | Wed Aug 03 10:17:27 EDT 2016 | proceng1
I did "scuff" the fid so it wouldn't be so shiny. Zero affect on contrast. We ended up moving it to another printer. We have 3 essentially the same printers, two completely washed the image out, the third sees it perfect as if it were black and wh
Electronics Forum | Fri Aug 05 15:09:30 EDT 2016 | proceng1
I grabbed another White board that does have the "natural" board around the fiducials. Still no go. See pictures
Electronics Forum | Tue Aug 02 12:19:48 EDT 2016 | proceng1
Actually I considered that, but I was thinking to leave the fiducial pad bare copper. These are customer supplied boards, but hopefully they will be willing to make the change for the next spin. Any tricks for getting it to see the boards we alre
