Electronics Forum | Thu Mar 27 11:39:27 EST 2003 | kenlchin
Hi,mantis, I has experienced this case.when we run a model ,misalignment and tombstone of some 0805 resistors and 1206 caps always occured.we have taken many actions,such as adjusting reflow parameter&printing parameter,checking pcb and parts soldera
Electronics Forum | Fri Mar 21 10:16:00 EST 2003 | O'Connor
Hi, Is there a standard that covers the shelf life of PCB's? I need to know, how long after manufacture a PCB can be stored in an uncontrolled envoirnment exposed to the atmosphere before being built on, currently we say 1 year, but nobody really kno
Electronics Forum | Mon Apr 28 18:34:17 EDT 2003 | Brian W.
We typically do not try to pick up and hand placve chip resisstors and capacitors. The risk and cost is too high for components that are a penny or less. We take into consideration that on many of our components, someone will have to test them to v
Electronics Forum | Tue May 06 09:38:41 EDT 2003 | blnorman
We use both labels and lasers to mark our boards. Since implementing the lasers, the downtime attributed to bar code labels on those lines have dropped to virtually nothing. We still have problems with the labels wrinkling during reflow making read
Electronics Forum | Thu May 08 10:44:48 EDT 2003 | mark_susol
I am experiencing a problem with print misregistration only in one direction on our UP2500. When it prints from front to back I get perfect regsitration on micro BGAs, but on the second stroke moving back to front I get a misregistration in the strok
Electronics Forum | Tue Jun 10 20:31:55 EDT 2003 | iman
In a perfect world, the machines would be maint."guys" for the automation machines. Think "closed loop" system. Anyway, getting back to our reality job, we are still game for automation to improve thru'put, quality, reduce problems. The focus here
Electronics Forum | Tue Jun 10 10:58:54 EDT 2003 | Frank
Hi, I currently work on SMT department to uptimize all process. I've just selected the solder paste after testing 15 different products. To be able to do that, I had to create a procedure to evaluate each paste and to be sure that my profil was per
Electronics Forum | Sat Jun 21 00:37:20 EDT 2003 | nifhail
Most of the capacitors & resistors supplier have implemented Leadfree finished on their components and like it or not, most of the PCBA house already using them in their process. I just got a notice from my component supplier telling me that they wil
Electronics Forum | Thu Jun 26 21:38:31 EDT 2003 | Dreamsniper
Hi Guys, Need your good advice about this for a 5 thou stencil thickness: 0603 pad is 50mil x 40mil 0805 pad is 75mil x 45mil 1206 pad is 70mil x 50mil I want the above apertures to be in IPC STD Homeplate Design + an area reduction of 15%. Will t
Electronics Forum | Thu Jul 03 07:43:50 EDT 2003 | davef
So, there is a crack or gap between: * Solder and component termination. * Component termination and component body. Correct? Describe: * Coarseness / smoothness of the metal on the termination underneither the crack. * Solder left on the terminatio
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