Electronics Forum | Tue Mar 09 20:08:08 EST 2004 | davef
Warping BGA are the usual cause of shorts in the corners and are usually caused by the reflow profile. BGA have a natural tendency to warp due to CTE and package thermal mismatch, as you have seen at rework. The PBGA will go from a bowl shape to an
Electronics Forum | Tue Mar 09 09:31:49 EST 2004 | Robert
Yes, in fact I do have 3 T/C connectors but I've never known how to use them nor what to connect to them. I generally address problems by merely changing the recipe up or down depending on what I see on the board(s). Someone mentioned to use a MOLE b
Electronics Forum | Tue Mar 30 20:04:19 EST 2004 | Ken
If speed is truly an issue, migrate to no-clean. However, this is not always an option. Why bake after 1st smt pass? Because you are probably not drying completely under the BGA components, and/or you are pushing water into the parts/boards/ vias
Electronics Forum | Thu Apr 01 11:27:17 EST 2004 | Jimmy
I have some fine pitch QFP's to rework with our smt rework system (forced air). There are no intitial concerns in removing the component (we havent actually begun the rework process) however, installing a new chip presents a problem. The QFP has
Electronics Forum | Fri Apr 16 07:34:10 EDT 2004 | Claude_Couture
Ken, thanks for your answer, it is much better presented than what I was fed by our qc. By "calibrating TCs" I meant the readings the controller is displaying on the screen. So that would be the converter that we would check and calibrate. Thank you
Electronics Forum | Wed Apr 28 12:33:05 EDT 2004 | Dave G
Rob, Don't know if you bought an "H" tower with your UP or not. You did you can have a dedicated support plate made from Aluminum that has pockets machined out to match components on the bottom of the board. (Most of the workholder guys can set you
Electronics Forum | Tue May 18 22:12:52 EDT 2004 | Ken
I have considered using the same security methods employed at thousands of Gas stations across the USA. The bathroom key is attached to a large carburator, tire rim, or any 30 pound piece of towing chain! Seriously, I look at my processes and try a
Electronics Forum | Tue Jun 01 18:06:36 EDT 2004 | Rob
I used an Ultraprint 2000 so if that's what you use then maybe I might be able to help. First, I'm assuming that you've already passed the Teach New Board section. This is board dimension, X and Y boardstop, stencil/squeegee heights and strokes. If
Electronics Forum | Thu Jun 03 17:43:34 EDT 2004 | g2garyg2
Hi Doug, Read your inquiry. My company PRO-MATION has some exciting technologies available for both top side and bottom side selective laser soldering. Our work cells are great for low volume / high mix environments and are capble for both Tin Lead
Electronics Forum | Sat Jul 03 10:03:22 EDT 2004 | Bryan Sherh
Things to consider are: * Thermal expansion > characteristics of you flex and your pallet > should be better matched. We use G-10. * > Placement of your two sided tape should be > better, more uniformly distributed. We run strips > the length o
