Electronics Forum | Thu Oct 17 21:32:28 EDT 2002 | davef
Please help to clairify the problem. Are we talking: * A pre-reflow [placement] problem? * A post-reflow [solder wetting] problem? Is the wetting issue that you mention related to the board or to the component? Please give us a little more detail
Electronics Forum | Fri Oct 18 13:36:27 EDT 2002 | nwyatt
Sounds like you are a CM. In that case, I would suggest that you do profile every new product that comes through the door as a way to cover your a** to your customers. In the offchance that your customer requests to a see a copy of your oven prof
Electronics Forum | Mon Oct 21 18:31:45 EDT 2002 | MikeF
Mike, If your wave solder machine doesn't have enough preheat capacity you can put the board in an oven and warm it part way before you put it into the wave solder machine. This works best with a spray fluxer, as a warm board will collapse the foam
Electronics Forum | Mon Oct 21 22:15:36 EDT 2002 | davef
First, SIR data is heavily dependant on the test pattern selected. Be very careful when comparing the results of resistance readings taken from different geometric patterns. Second, if yer talkin': * Bare boards, yupper. * Finished assemblies impor
Electronics Forum | Wed Nov 06 05:13:01 EST 2002 | Dreamsniper
Crystalline flux if it is really clear should not be a problem. We were using Amtech paste before and we have the same results. Sometimes we mistakenly see it as a dry joint because of the reflections from the lighting of our Metcal inspection system
Electronics Forum | Wed Oct 23 15:33:38 EDT 2002 | Randy V.
Dye penetrant is a liguid that will wick through very small cracks. I used over 10 years ago for checking cracks in glass feedthru's in hermetic packages. You put the dye on one side of the seal and developer (white) on the other side and the red dye
Electronics Forum | Tue Nov 05 06:51:59 EST 2002 | V.RAMANAND KINI
Hi, This is a widely discussed subject and since you have asked a brief explanation, I assume, you are a business man or a top executive in the company venturing in to COB. I waited to see if someone replies to you. May be it is a very old subject
Electronics Forum | Tue Oct 29 15:55:16 EST 2002 | babe
If you are using a low end hot air system IE: Weller, Hakko or Pace then your problems are with the system and not necessarily with your process. However process is important. We have found by inspection with an Ersa Scope (BGA inspection system) tha
Electronics Forum | Tue Oct 29 15:25:12 EST 2002 | russ
Thanks for the info, I have previously not used the Ps and Qs so to speak and I am finding now that we are running into trouble mostly due to component height and body sizes. So for example we currently have "16 pin SOP" what we need is "16 pin SOP,
Electronics Forum | Thu Oct 31 10:14:53 EST 2002 | cyber_wolf
Sorry if I offend anyone, but service and maintenance contracts are extortion. You will get waaaay overcharged for something that any decent tech with experience should be able to do for you.(For a tenth of the cost) I don't care what anyone says.I
