Electronics Forum | Sun Jun 23 12:24:37 EDT 2002 | stepheno
I worked at a place where a customer complained that the resistance of some components was lowered. It was found to be flux entrapped from the wave solder process. The tube of epoxy, didn't have a date of manufacture, shelf life, or use by date on
Electronics Forum | Thu Jul 18 21:04:06 EDT 2002 | davef
So, why can't you clean misprints on Entek boards? Entek: Cheap, flat, OK shelf life, not without process and fabrication issues. Your Entek organic solderability protection is probably Entek Plus [CU106A] made by Ethone OMI. Consider getting a co
Electronics Forum | Thu Aug 29 20:01:23 EDT 2002 | davef
Many people use the same spacing [and pad designs] as they use for primary side SMT. We don�t. DOWN STREAM SMT-TO-SMT SPACING: In addition to proper orientation, components cannot be immediately upstream of terminations that are to be soldered or b
Electronics Forum | Thu Dec 05 11:04:27 EST 2002 | slthomas
They're IR, bottom side only. Frankly wave solder is not my forte (there are those that would claim nothing is), but I've personally been tasked with developing a process to do reliable, high volume bottom side SMT, so I'm drawing a lot from the tec
Electronics Forum | Wed Dec 18 12:49:04 EST 2002 | Mike F
I've used rice, too. The trick is to make the bag big enough to hold down the part or parts, but not so big it interferes with the top side heating of the parts around it. I've never actually used lead or steel shot, the heaviest fill material I ever
Electronics Forum | Fri Jan 24 16:46:21 EST 2003 | MA/NY DDave
Hi, Distance Engineering is always difficult. I am guessing that the old machine and process ran wonderfully / acceptable. If you still have the old machine, how about running an empty board through it and then the new machine. Without flux observ
Electronics Forum | Fri Jan 24 17:05:17 EST 2003 | Hoss67
DDave, I do not have the benefit of having the old machine here for comparison unfortunately. Comparing topside wetting to old sample boards run on the older machine show similar results. No solder balls. I have a thermal profiler and have run ma
Electronics Forum | Fri Jan 24 22:50:51 EST 2003 | MA/NY DDave
Hi Again Distance is tough, besides far less exciting.. You got the panther at your breast, screaming!! Somehow you have to make this go the other way. Rather than solder flowing any old place it wants to, when it wants to. Chasing the heat, Chasi
Electronics Forum | Tue Jan 28 16:27:43 EST 2003 | MikeF
I agree with most of the other suggestions here, but 90 C for a topside preheat temp seems low to me. I remember aiming for 98 to 104 C for topside temp just before hitting the solder. Boards that had large ground/power planes or a lot of layers I wo
Electronics Forum | Thu Feb 27 16:38:01 EST 2003 | russ
James, The last time I evaluated in-line cleaners (2 yrs ago)the Aquastorm was by far the best. They were the easiest to maintain, acheived the highest cleanliness level (per in-house testing with omegameter 600 heated solution), and were the quiete
