Electronics Forum | Thu Nov 13 09:27:21 EST 2008 | cisridn
I have tried covering the vias with thermal tape and that did not work. I like the idea of plugging the via with a temporary solder mask. I will try that the next time I build a fixture which should be tomorrow. This is mainly a problem only becau
Electronics Forum | Wed Nov 12 13:00:58 EST 2008 | cisridn
I have to build test fixtures for RF Power transistors. These components generate alot of heat so the PCB is soldered to a baseplate. The problem I am having is that I am getting too much solder flowing thru the via's and flooding the topside of th
Electronics Forum | Wed Dec 10 16:00:07 EST 2008 | cisridn
Just to update. I tried using the temporary solder mask again and it worked great. I guess the first time I did not let the mask to cure long enough. Also, I inquired about have the via's plugged with SR1000 in the future and I was told by our PCB
Electronics Forum | Fri Nov 14 17:21:17 EST 2008 | cisridn
Plugging the holes with temporary solder mask helped some, but once the solder starts to reflow, the fumes from the flux pushed the solder mask out. What I ended up doing in addition to using the temporary solder mask was covering the areas of pcb w
Electronics Forum | Wed Aug 29 11:22:11 EDT 2007 | gmoritz
Thank you for the answers to my questions. We are running two-lead LED insertions. Most of our PCBs are square between 9" and 14.25" in a 16 x 16 array, so pitch ranges from 0.52" to 0.90". Further complications are that most of the boards have th
Electronics Forum | Thu Aug 12 11:00:42 EDT 2010 | hegemon
Without seeing a picture, my first instinct would be first and foremost some fixturing that provides full support for your print process. After that, since you are citing bow and twist, consider that the fixturing might as well travel through the ov
Electronics Forum | Wed Aug 11 18:35:17 EDT 2010 | julie1
Anyone work with or have knowledge about metal core/clad boards? The board I'm working with is approximately 2" X 3/4" aluminum core pcb, in a 56 up array. There are 3 LED placements per board. I'm having trouble getting a consistent screen print.
Electronics Forum | Mon Jul 01 09:33:08 EDT 2019 | dbuschel
if you can't change the PCB materials or design at this point, you might be able to reduce it somewhat through the use of fixtures or edge stiffeners. Unless it is a particularly thick board, I don't think the reflow profile would be the issue. The t
Electronics Forum | Thu Oct 11 22:25:50 EDT 2001 | davef
Bruce I�m with yall. Designers and fabricators say �pins�. You say: * BGA pins are 1mm [0.039�] pitch. * BGA pads are 0.4mm [0.0157�] diameter. * BGA pins are 0.6 mm [0.024�] side-to-side. * Board thickness is ~0.4 mm [0.015�] First, as you can
Electronics Forum | Wed Oct 31 12:24:21 EST 2001 | Stephen Zhou
We are designing the SM fixture for small PCB, does anybody know where we can get the spring holder which can hold the PCB to the fixture? Who is the manufacture for this part? Thanks in advance. Stephen
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