Electronics Forum | Fri Jun 20 18:12:42 EDT 2003 | blundell
This is a very narrow view you have, X-Ray does not see all the problems that can occur, even with good rework gear or a sound reflow process it is still possible to get soldering defects, how do you know if you have a sound process to begin with if
Electronics Forum | Mon Jul 07 00:11:10 EDT 2003 | praveen
if the capacitors are placed very near to the edge and their position is 90 deg than it may cause crack.4thly if the reflow ramp rate is more than 3 deg C then it may crack. 5th ly if the solderin tip temp. is very high and soldering bit is very thi
Electronics Forum | Tue Jul 29 21:28:43 EDT 2003 | Dean
Copper thieves...great idea...used some just today. How about some details on the wave soldering issues? I bet there are some mega-expert super brain-e-ax on here that would love to share their lifetime learned black art. Or maybe not (kidding).
Electronics Forum | Wed Jun 25 12:13:31 EDT 2003 | russ
A lot of it depends upon what the lead terminations are and the storage conditions. For example if they are tin you will run into trouble. We have used all types of parts that are all ages (We just started doing BGAs that are 5 years old.) I don't
Electronics Forum | Wed Jul 09 19:05:06 EDT 2003 | randywomack
LOZ. Under-cured or out-of-spec(sloppily) applied resist is realistic. What other physics: Shiny resist surface is more prone to balls then matte finish. How about an operator eating fish & chips before handling the boards. Don't laugh... ... saw th
Electronics Forum | Thu Jul 03 15:03:39 EDT 2003 | Jim Nunns
My design group wants to change our route keep out around all SMT parts to 5 mil even under the parts with zero standoff. Are others in the industry routing under parts that have no standoff? My fear is that we will get shorting if the mask is scaped
Electronics Forum | Wed Jul 09 13:48:03 EDT 2003 | russ
Sam, You may want to be careful with your analisys, reducing paste volume also reduces flux volume. Flux is there to promote and aid in wetting. by reducing flux you may have initiated the poor wetting yourself with the experiment. Just anothe
Electronics Forum | Fri Jul 25 13:12:22 EDT 2003 | Bill
Brad, If you are considering ERSA equipment, we have a 2001 ERSA Versaflow High Speed Selective Solder Machine for sale. Please contact me at b-morgan@carolina.rr.com or call me at 704-795-6610 Ext 13 if you would like details. Also, please visit ou
Electronics Forum | Thu Jul 10 15:05:30 EDT 2003 | stepheno
Don't forget about moisture sensitive devices already on the board if you are reflowing the entire board again. No doubt the other BGA's have been absorbing moisture since the boards were first reflowed. You may have to bake the boards before reflo
Electronics Forum | Wed Jul 16 11:54:25 EDT 2003 | MA/NY DDave
Hi, I agree with everyone else talk to the Mfg and ask for their recommended profiles. They should know the heating and the cooling profiles. If you really want to do this yourself you are going to have to run several experiments to determine just