Electronics Forum | Mon Jun 25 11:09:26 EDT 2001 | wbu
Who is this, another Dave F ? For me there�s no problem with balling and beading. I know that the boards I have with the new paste do have all what�s needed for balling and beading, just one of the oldest designs with a stencil ...., oh boy, didn�t
Electronics Forum | Sat Jun 30 14:17:53 EDT 2001 | stefwitt
I would highly recommend that you test drive your vehicle before you buy it. Buy a test kit from Topline and have a stencil made. Make an appointment with the machine manufacturer and let them know that you come with your own boards and components.
Electronics Forum | Mon Jun 25 09:08:22 EDT 2001 | Dave G
What type of board finish ? I've seen this same defect with QFP's on some of our HASL boards. Best I can tell either the PCB's have poor solderability or uneven pad heights due to poor solder leveling at the PCB fab. Newer PCB's seem to yield bette
Electronics Forum | Mon Jun 25 20:59:51 EDT 2001 | davef
As Wolfgang says: Conveyor speed may be too high. Excuse me for not stripping-out my repetition from your list, but other machine adjustments to consider are: * Using more efficient [higher specific gravity] flux. [Got it!!!] * Adjusting wave shape
Electronics Forum | Mon Aug 13 18:16:31 EDT 2001 | fmonette
Be very careful how you perform the removal process if you want to re-use BGA/CSP devices. As you are aware, the majority of these components are classified as moisture-sensitive by the manufacturer. This means that if they absorb too much moisture
Electronics Forum | Fri Aug 10 07:54:20 EDT 2001 | John
We use scored boards almost exclusively on our new products, but there are some things to be aware of. 1) If it has SMT on it, hand breaking it is a bad idea (our customers refuse to discuss it). 2) Pizza cutters are a bad idea (our customers shou
Electronics Forum | Tue Feb 01 14:21:24 EST 2000 | Dennis VanBuren
We are considering the use of Immersion Silver for a PCB surface finish. We currently use Immersion Gold surface finish, which has served us well. However, recent discussions on the cracking of corner joints on large pin count BGA packages, with the
Electronics Forum | Thu Jan 27 08:52:05 EST 2000 | Todd A. Braun
We currently use a silicon conformal coating on many of our manufactured circuit boards and are experiencing situations where the coating doesn't conform. For example, on the sharp edges of components and corners of leads it pulls away before curing
Electronics Forum | Fri Jan 21 05:39:58 EST 2000 | Scott Davies
Hi ZJJ, I know exactly where you're coming from on this one! We have a similar situation here with a SiPlace 80S-15, rated at 15K max per hour. In practice, we achieve about 11K. The reason is fairly straightforward. The quoted maximum placements pe
Electronics Forum | Tue Jan 11 10:01:30 EST 2000 | Wolfgang Busko
Hi Pat, we had white tin boards laying around for about 10 month with no extra protection than the plastic bag that they were shipped in. Never thought of using them for there was a relayout planned to fix some serious bugs. But that�s life, relayo