Electronics Forum | Mon May 19 15:39:56 EDT 2003 | pjc
Curious. Are you finding no applications support from Dima or Manncorp (if a USA Dima customer) or Kester for that matter? DIMA SMT Systems NL. B.V. Beukelsdijk 2 5753 PA Deurne Netherlands Tel: +31 493 352 752 Fax: +31 493 352 750 sales@dimasmt.nl
Electronics Forum | Thu May 15 03:14:33 EDT 2003 | Hon Choi
Dear all, Not sure if you have this experience, but we've been seeing shorts on the BGA's from a widely known supplier "i". These shorts can not be found on the X-Ray, and when we remove the BGA, the component is ok. We peeled a few BGA's off, and
Electronics Forum | Thu May 15 07:37:49 EDT 2003 | pteerink
Have seen similar circumstances a couple times. Possible causes: 1) PCB defect - remove the BGA and inspect/test the PCB for shorts. ( trace short, layer short etc ) 2) PCB defect that only shows up when the BGA is populated - a short somewhere o
Electronics Forum | Sat May 17 02:13:43 EDT 2003 | Hon Choi
Thanks all. We are using no clean, so the boards are not washed. That would eliminate the trapped water issue. We would check the PCB after dismounting the BGA, and the short would not be found. When we place another BGA on the board, the board w
Electronics Forum | Fri Sep 12 22:57:13 EDT 2003 | Dean
What is the surface finish of the PCB? Tin? Imersion Silver? What flux is used in wave solder and / or SMT? I have much experience with silver migration and tin wiskers. Both can disappear during a reqork cycle. Both can be extremely difficult
Electronics Forum | Fri May 16 08:13:26 EDT 2003 | radney
We are a mixed volume facility and we are doing our utmost to achieve 55% utilization on HSP's (UIC 4797's and 4791's) We are basing this on a world class metric. I am wondering if anyone else out there is measuring utilization, what sort of result
Electronics Forum | Mon May 19 17:17:41 EDT 2003 | JB
We currently use a Universal GDM for our glue dispensing applications, piston pumps. My question is: Have you had any problems with air getting in the dispense system that will cause missing dots? If so, how have you approached to this problem? Int
Electronics Forum | Sat May 24 00:43:59 EDT 2003 | iman
Our engineers did a study on our medical product with 1mils standoff height, and one issue was 100% of the boards that underwent ultrasonic failed due to failure of the package wirebonding. Poor reflow control would be one area to review in any event
Electronics Forum | Tue May 27 04:31:59 EDT 2003 | davef
Try: * Operational amplifier: http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=operational+amplifier+20mhz&spell=1 * EPROM: http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=eprom+20mhz
Electronics Forum | Wed May 21 14:47:49 EDT 2003 | radney
On the new 4797 T12W8P feeders we are having trouble picking the very thin chip resistors. Adding foam to the feeder (beneath the pick point) helps, but it only minimizes our frustration. Universal has a reel of these parts and they are looking into