Electronics Forum | Wed Feb 12 13:37:22 EST 2003 | dwanzek
I need some input on what good solder thieves dimensions should be. I am limited to solving my bridging problem with solder thieves; all process/wave variables have been adjusted to try to solve this problem. There are several of these connectors on
Electronics Forum | Fri Mar 07 14:09:16 EST 2003 | davef
Q1: What are the recommended stencil apertures for a TSOP40. Lead pitch 0.48mm & lead width 0.21mm. A1: We've talked about this previously here on SMTnet, for instance check the fine SMTnet Archives: http://www.smtnet.com//forums/index.cfm?fuseactio
Electronics Forum | Thu Apr 03 11:17:17 EST 2003 | rdr
Well, first off now I'm just starting to believe that we are fracturing again. But here is some more input D1 ENIG? I would not have thought that they would be but as usual you are probably right. D2 Again I would have to agree about it should affe
Electronics Forum | Fri Apr 04 09:28:59 EST 2003 | davef
Q1: Anyone has any ideas on how this post-SMT reflow solder joint could have changed to whitish joint? A1: Dunno. You need to tell us more. For instance: * What is the appearance of this white residue? [eg, glassy / coarse, milky colored / opaque,
Electronics Forum | Wed Apr 16 16:55:38 EDT 2003 | russ
Thanks for the info, Here is a couple more questions (and you thought you were done) What size are these caps /res? how thick is your stencil? what type of oven are you using? what is the finish of the board? Anyway, it seems like (from a distance)t
Electronics Forum | Wed Apr 14 20:48:43 EDT 2004 | Ken
Just a thought.... Some Fluxes require temperatures upto 260F (127C). Are you using water based flux or solvent (alcohol). I have noticed that many wave machines are NOT capable of preheating adequately when using water based materials. This can
Electronics Forum | Wed Jun 25 10:29:32 EDT 2003 | caldon
Hey Mike- We ran into the same thing when we purchased a Large CanadianManufacturers repair business. We were creative and first used an ESD bag cut open (Simulate the paper idea) then we used a 3M parts bin and would tip it on its corner to funnel t
Electronics Forum | Fri Jul 11 13:04:13 EDT 2003 | fmonette
Hi Chris, Yes there is a limit to the bake cycles : "...the cumulative bake time at a temperature greater than 90C and up to 125C shall not exceed 48 hours. If the bake temprature is not greater than 90C, there is no limit on bake time..." Ref: J-S
Electronics Forum | Mon Jul 21 20:42:12 EDT 2003 | iman
Don, thanks for the thoughtful insight, can I run some thinking points for your further assistance? 1) ours is a Au over Ni PCB bareboard. Do you think excessive Au thickness is any way a influence for poor solder formation? I did notice the PCB ba
Electronics Forum | Tue Feb 24 09:52:14 EST 2004 | davef
First, two points about hole / barrel fill are: * A filled hole is an excellent indicator of the optimum process and optimum quality PCB. * The study that showed that holes need not be filled was paid for by the US Army and performed by Lockheed in
