Electronics Forum | Wed Apr 28 16:07:32 EDT 2004 | davef
In rework, your thermal recipe needs to better mimic the recipe that your use in your reflow oven. Oh, that and proper preheating of the board and BGA. [Yano, if you get bored fighting this, rereflowing the board is within reason.] That you are hi
Electronics Forum | Thu Jun 24 09:19:31 EDT 2004 | Cal
The Angle view (or Variable Angle Viewing) gives you another perspective on joint inspection. Glenbrook has two great illistrations on the varible angle viewing literature (.pdf file): Here are a few examples: 1) Looking straight down on the ball..it
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
Electronics Forum | Mon Jul 19 21:25:28 EDT 2004 | davef
It seems like the flux is burning-up before the metal begins to flow on this slightly odd component. Alpha talks about alternate reflow recipes for WS609, as follows: * A straight ramp up profile is preferred for reflowing low to medium thermal mass
Electronics Forum | Wed Dec 22 20:51:12 EST 2004 | Mark
Yes, shameless. You could have come out and said that APE's equipment is the best thing since sliced bread but . . . you had to get all scientific with us. We already get bombarded by subliminal messages in commercials now, tech forums. In all ser
Electronics Forum | Fri Jul 23 05:14:40 EDT 2004 | greg york
Hi Thomas Ever considered that this maybe HASL flux left on PCB as this is extremely hygroscopic and has heat transfer fluids that cannot be baked out unless you go to a temperature of around 600C. One way of testing is to leave iron tip on joint an
Electronics Forum | Wed Jul 28 18:51:52 EDT 2004 | gregoryyork
Found problem many years ago by chemical extraction and IR analysis, produces alarming amounts of plasticizer from under cured or incorrect mix of hardener to liquid photoimageable solder resist. Problems this causes are endless and many things blame
Electronics Forum | Mon Aug 23 16:37:22 EDT 2004 | Terry
Three methods, all work, all require generous use of flux. 1.) Use a heated, electrical desoldering tool with flux. Just be sure that you select a forgiving desoldering tip with a rounded tip end to it so that you do not scratch the pad. Advantage:
Electronics Forum | Tue Aug 24 14:49:21 EDT 2004 | Rush Fan
I was notified that one of our operators took it upon themselves to run a board assembly through our reflow oven multiple times when he discovered what looked like incomplete reflow. Based on this being done, its been asked of me how, if any, has the
Electronics Forum | Thu Aug 26 16:48:37 EDT 2004 | davef
You're correct. Operators shouldn't be doing "touch-up". [No value added] Take that as your clue for areas to improve process. Babbling about touchup: * Left to itself, touchup feeds on itself, operators are parinoid that inspectors will "ding" th
