Electronics Forum | Tue Jun 04 13:11:49 EDT 2002 | stepheno
One thing that has worked for us is to get the full size stencil for the board. Then we put a bit of paste on it, then someone holds the BGA on the other side and we apply paste to the BGA. It can be awkward. We only use this technique for if we ar
Electronics Forum | Fri Jun 07 13:57:36 EDT 2002 | Hussman69
Nope, too loose, allowing blood flow because he actually asked a logical question. Most times they ask me a question like "How does the heat generated from your screen printer affect the process of your wave solder?". I would generally answer it do
Electronics Forum | Mon Jun 10 13:15:32 EDT 2002 | stepheno
My take on it, is that you can't exactly match labour to machine requirements. So the question is, which are you going to focus on? Keeping the machine busy or keeping the people busy. One or the other will have "waiting" periods. To me because the
Electronics Forum | Mon Jun 17 21:18:24 EDT 2002 | davef
I don't understand "well we can't paste the flip chip on its substrate because we are using flux". There is flux in paste. What's the difference? If you use solder paste, there will be more room for underfill, as compared to flux only. Some peopl
Electronics Forum | Tue Jun 18 17:01:50 EDT 2002 | kenbliss
Todd, for the sake of the forum could you please spell out a few key line items about why you state the Juki machines is Junki. Clearly you are unhappy with their machine. The best purpose of this forum is to identify problems with machines, proces
Electronics Forum | Fri Jun 21 12:59:20 EDT 2002 | stepheno
When you say well designed for wave, does that include "extra" solder pads for the IC's for solder thieving? And Boards that are well designed for wave don't have QFP's on the bottom. They might be ok but then the board would be "ok for wave", but no
Electronics Forum | Thu Jun 20 04:41:47 EDT 2002 | redmary
thanks, but I also encounter the solderability problem. because these boards are HASL or Ni/Au finish, and we print the solder paste and reflow, the result shows the some non-wetting area. and the reliability test also proves to be bad. so the critic
Electronics Forum | Mon Jun 24 21:56:15 EDT 2002 | davef
Russ is correct. The sales-types telling you these stories are not acting reputably. You should not allow them in your plant. If you do not control the sales-types that gain entry to your plant, ask that person to come on-line here and we will exp
Electronics Forum | Mon Jul 15 10:56:48 EDT 2002 | jseagle
I see this all the time and we are an OEM that can specify how parts are to be packaged. That being said, purchasing is always having problems finding the part in the specified packaging and end up buying it however they can get it. It's not like w
Electronics Forum | Wed Jul 17 03:36:00 EDT 2002 | robbied
Answers are: *Mainly copper and potassium. *it looks like a soft growth. *customer will not accept this, hence the returns. These boards are either reworked or scrapped. *Flux is not an issue. *The cleaning process has been found to be the cause of t
