Electronics Forum | Wed Jun 05 21:33:12 EDT 2002 | davef
Tough to say based on what you have told us. Things to Determine are: * Is the heat at the solder connections that are not reflowing properly adequate? * Is the pad surface of the solder connections that are not reflowing properly solderable?
Electronics Forum | Thu Jun 13 20:55:46 EDT 2002 | russ
Having just gine through a similar problem myself (with much less equip.) Here are a few things to consider and/or look at Do you have the proper pad size? It should be the same size as the pad on the BGA. Is the board warping during your operati
Electronics Forum | Mon Jul 01 20:55:00 EDT 2002 | ianchan
Hi mate, excursion = deviation? (what deviation you talking abt?) pls explain your "test vehicle"? and machine type/setting?
Electronics Forum | Tue Jun 25 08:29:45 EDT 2002 | davef
Ianchan: Watch yourself. Old style vapor phase oven are being replaced by ovens build to capitalize on new generation fluids [ie, Ausimont, F2, etc]. These machines could fill roles in soldering of no-leads.
Electronics Forum | Wed Jun 26 00:49:52 EDT 2002 | ianchan
Steve, I'd second Daan's opinion. BGA profile we use gets a peak of 210deg-C to 223deg-C (but that's using our WS paste unique characteristics) with reflow zone holding time of 45-60sec. We had 6 PBGA and 2 ceramic BGA on a 6 layer PCB. typical p
Electronics Forum | Fri Jun 28 11:25:01 EDT 2002 | dason_c
You need to check your pot temperature and the board surface temperature. You know the melting point of the 63/37 at 183C. If your top side surface temperature is above this point and second reflow may happen. Also, the board will warp and may cau
Electronics Forum | Thu Jul 11 18:00:34 EDT 2002 | jax
Tony, Do an archive search for "lizard". Some times all you really need is a lizard tongue. No machine is complete without one.
Electronics Forum | Fri Jul 12 19:32:48 EDT 2002 | SMTA Juarez Mexico Chapter President
I member of our chapter is looking for reballing services for BGAs. Or maybe equipment and know how to establish their own process. Any help will be appriciated.
Electronics Forum | Mon Jul 22 15:35:28 EDT 2002 | davef
There has been books of stuff written on the topic. One expample is: http://nepp.nasa.gov/index_nasa.cfm/476/CD467677-8023-44E3-A795CBCF2DECFF05/
Electronics Forum | Tue Jul 23 14:17:46 EDT 2002 | davef
Hell-loooow!!! Why not contact the document author? Try: Reza Ghaffarian - Reza.Ghaffarian@jpl.nasa.gov Jet Propulsion Laboratory Phone: 818 354-2059 | FAX: 818 393-5245
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