Electronics Forum | Thu Aug 21 21:10:19 EDT 2003 | davef
Tax laws vary from state to state, but we pay no takes on capital equipment. It could be that since you don't have a tax certificate yet, the seller is just playing it by the book and aiming to stay out of trouble. So, they'll charge you taxes and
Electronics Forum | Thu Aug 21 15:50:12 EDT 2003 | davef
Couple of points are: * You're technically correct that ball height has the potential to vary by 8 thou, but we never see that much variation. Ball heights within a lot of components vary just about nil. * When we place BGA, we smush them into the p
Electronics Forum | Thu Aug 21 18:36:32 EDT 2003 | paulm
Hi Dave and Justin, Thanks for the advice. Dave you mentioned you "smush" your bga's. What type of machine are you placing then with it? Is the additional pressure to smush them machine or manually applied? Also, the 0.004" variance we are being
Electronics Forum | Fri Aug 22 11:22:40 EDT 2003 | jseagle
When I said partial build I should have clarified that all the boards we build are double sided so the plan is to build the bottom side then build the top side as they are ordered. The bottom will be standard and the top will have the options. I di
Electronics Forum | Thu Aug 21 16:14:40 EDT 2003 | jgregory
Does anyone out here remember the Advanced Research Technologies ISIS machine? It was fantastic at defect detection by seeing hotspots on difficult to troubleshoot boards. I know that Photon Dynamics bought out the ISIS technology from ART, but the t
Electronics Forum | Thu Aug 21 20:20:21 EDT 2003 | davef
Here's the transaction: http://www.photondynamics.com/pd/pr_1025640041 ... but Photondynamics doesn't talk about a thermal imaging product. On the other hand, nether does ART http://www.art.ca/en/products/products.html We spoke to Jacques LaBell
Electronics Forum | Fri Aug 22 09:41:49 EDT 2003 | davef
Mantis: Kenny reflows paste on [wave solders] all via, not just the test via, to plug the via and provide for a pressure seal between the board and the test fixture. Beyond that, since solder is softer than copper [and fills the hole better], solde
Electronics Forum | Mon Aug 25 12:04:42 EDT 2003 | John Inglis
We are currently seeing short circuits on both 100nF and 1uF capacitors from TDK circa 2001. There are known design limitations to the PCB resulting in mechanical stress, howevre this PCB has been built for several years and this is a new phenomenon.
Electronics Forum | Mon Aug 25 20:49:27 EDT 2003 | msimkin
Anyone use glass filled nylon connectors utilising the intrusive reflow techique (pin in paste). We are having probe with them becoming brittle after reflow- apparently due to moisture. We are also seeing bubbling on outside plastic.Peak oven temp 22
Electronics Forum | Mon Aug 25 22:14:34 EDT 2003 | davef
You need a nylon with a heat deflection temperature [heat distortion temperature] - 0.45MPa ( C ) similar to your reflow peak. The HDT of the nylon in your connector is probably ~200*C. For more, look here http://www.tycoelectronics.com/environment
