Electronics Forum | Fri Mar 28 00:56:50 EST 2003 | iman
we have a issue of post-reflow oven (SMT) soldering defects of blowholes and pinholes. Any suggestions or knowledge on root cause is appreciated to be share? BACKGROUND : we DI water wash and oven bake the PCB bareboards at 90deg-C for 60mins, to r
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 | Thu May 08 11:58:12 EDT 2003 | fmonette
Hi Chrissie, This might be old news to you but I just wanted to make sure that you are aware of all the implications of BGA rework relative to the control of moisture-sensitive components. For example, you need to keep track of the total exposure t
Electronics Forum | Thu Apr 24 20:39:01 EDT 2003 | davef
3NaH2PO3 + H2SO4 + 2H2 + Ni^0 Potassium is co-deposited with the nickel, as follows: H2PO2^- + Hads => H2O + OH^- + P 3H2PO2^- + P => H2PO3^- + H2O + 2OH^- Nick Biunno gives a very short, over simplified summary: "Everybody looks at the nickel, b
Electronics Forum | Tue Jun 24 11:27:57 EDT 2003 | caldon
Sorry let me explain. It is a ratio. When buying a machine 80% of my evaluation is with the Support. The other 20% is the machine its self. I read the Brochures and Capabilities to narrow my search to the machines meeting my needs. From there i am c
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 | Mon Jul 21 08:34:44 EDT 2003 | Don Bell
Blow holes/ pin holes in solder joints are the result of multiple root causes. Suggested analysis might look like this; 1) What method of solder preservation is used on the bare board. (hasl,enig, osp, etc.) HASL can leave unwanted flux residues,
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 | Mon Jul 21 09:34:54 EDT 2003 | caldon
A machine for serious concideration MRSI 175uf Features: -High-throughput Underfill -Parallel Processing Conveyor Lanes -Linear Positive Displacement Pump -Total Process Thermal Control -Intuitive Graphical User Interface - Windows NT -Advanced
Electronics Forum | Thu Sep 18 15:29:59 EDT 2003 | Gabriele
Hi all, by reading along those thread (SOT23) and Tan outgassing I learned plenty of things. My first time approacing this kind of Q$A Forum, very intesting tech communication way. Any way, the path of magnetism effect was chosen when time ago we met
