Electronics Forum | Sat May 01 07:17:03 EDT 2004 | davef
Try rotating [eg, 90*, 180*, etc] the board prior to running it through the oven. Ditch the pallet, as a previous poster suggested.
Electronics Forum | Fri Apr 30 16:44:23 EDT 2004 | davef
You're correct. Higher resistance with an open makes more sense. Try running your profile on that J6, corner ball. There may be something in the board layout that is sucking the heat from that pad.
Electronics Forum | Sat May 01 07:23:49 EDT 2004 | davef
The large copper pours in the vacinity of this part make it essential that you get your thermal recipe correct. You may need to slow down your conveyor [decrease the ramp rates] in order to minimize the effect of the board has on the different heati
Electronics Forum | Mon May 03 21:39:09 EDT 2004 | ACE
Does anyone know there a standard matrix of clearances part to part for Class 2 and Class 3 board design. IPC does issue a preferred matrix but they are so liberal they not so useful in the real world. Any suggestions would really be appreciated.
Electronics Forum | Mon May 10 09:30:35 EDT 2004 | davef
Q1: What are the basic requirements of thermal profiling? A1: Not sure what you�re looking for here, but when doing a profile, you�re trying to measure the temperature at specific points of the board, as the board moves through the oven. Q2: How we
Electronics Forum | Tue May 11 10:43:37 EDT 2004 | Melissa
Has anyone experienced problems lately with excess flux residue left on the board after reflow when using Alpha UP78 OSP paste? We are getting a component failure that the designers are blaming on too much residue. Thanks
Electronics Forum | Thu May 13 17:11:48 EDT 2004 | Longhua
We are looking for PCB suppliers capable of building .5mm through hole boards. Internally, we require 5 mil traces, sometimes 4 mil. Our preferred material is Polyimide or BT Resin, and perhaps FR408. All help and/or recommendations is greatly appre
Electronics Forum | Tue May 18 15:42:39 EDT 2004 | davef
M.L. Feather I'm sorry I missed the first part of this discussion. Why are your fids black? Is this something you requested? Is it a board defect that you are trying to "work around"? What is the black material?
Electronics Forum | Fri May 21 10:57:23 EDT 2004 | Frank
Does your machine have pattern recognition, so you can program a corner of a trace, or some other unique feature of the board?
Electronics Forum | Fri May 14 14:13:54 EDT 2004 | bwet
Does anyone know of a technique t selectively remove solder mask outside of the traditional scraping or grinding methods. (This would be in areas around an area array part.) BWET
