Electronics Forum | Tue Aug 09 13:25:24 EDT 2005 | pr
From what I can gather, the annular rings are used for grounding when these boards are put in housings. A screw goes through the hole and is torqued down. If there is excess solder on the annular ring, the screw doesn't seat properly. The pallets cov
Electronics Forum | Wed Aug 10 11:57:16 EDT 2005 | pr
Is the peelable mask (put on by the boardhouse) flat on the surface of the pcb? If so can you tell me the material name, so maybe I can find a picture? We have to print adhesive on the board, so the mask has to be flat. That is why Kapton from the b
Electronics Forum | Wed Aug 10 20:49:27 EDT 2005 | bobpan
Quad/Tyco should have some old 'q-tips' on programming help for that type of board on a 'c-series machine'that i wrote a long time ago. I cant remember anymore exactly how to help you but they should have some paperwork on doing it. It also is a 'sli
Electronics Forum | Thu Aug 11 08:56:20 EDT 2005 | pjc
Some causes of lack of top side fillets (hole fill) are: 1. Not enough pre-heat (a top side preheat will help, if no-clean flux, be sure to follow flux mfrs specification for top side board temp just before hitting wave) 2. Not enough flux 3. Flux i
Electronics Forum | Fri Aug 26 21:23:38 EDT 2005 | Jes�s Salinas
Hello , In our case we take the results from the repair station. Each test station has its own repair station so from there we count the process defects : placement and printing. The formula used to calculate PPM = DEFECTS / (PARTS PER BOARD x UNITS
Electronics Forum | Wed Aug 24 08:46:10 EDT 2005 | aj
James, I understand that you would like a quick fix answer but profiles take time and analysis to get right. Firstly, your paste supplier should provide an example of the correct profile for the paste you are using. Secondly, what makes you think
Electronics Forum | Wed Aug 24 11:48:37 EDT 2005 | Anthony
Hello, we are currently designing our first PCB with surface mount components on both sides of the board. I understand about solder thieves in order to help short circuits. Are there any good white papers or books which identify the best practices w
Electronics Forum | Thu Aug 25 16:50:13 EDT 2005 | Mark
I have an application that requires soldering pieces of metal (copper plate and copper fins to make a heatsink). Each piece is about 1 lb. I cannot test it in our reflow oven (5 zone) since the piece is about 3" in height. Has anyone attempted to
Electronics Forum | Fri Aug 26 09:57:21 EDT 2005 | russ
The Immersion gold is not a problem with BGAs specifically but "black pad" which can be present anywhere. The unfortunate thing with BGAs is you cannot see it. Personally I hate white tin. It is okay for single sided boards running no-clean, but c
Electronics Forum | Tue Aug 30 07:01:52 EDT 2005 | edgetech
EdgeTech SMT Tech here. I was questioning the process our Engineers are using concerning Water Soluble solder paste. I have no experience with this paste. I was wondering what need so be done differently when using this paste. As far as I know the on
