Electronics Forum | Mon Feb 07 19:49:50 EST 2000 | Tony Di Mauro
Jose, I have seen this defect before. We called it re-reflow. We found the part was originally attached at SMT. Later on after seeing a heat cycle at the wave machine the leads would de-attach causing an open at In-Circuit Test. Resolution was t
Electronics Forum | Fri Oct 08 18:26:19 EDT 1999 | Dave F
| | Is there an IPC Standard stating the max. number of times that a PCB can pass through a reflow or wavesolder machine without having solder mask breakdown. | | | | PCB is FR4 | | Solder Mask is LPI | | Reflow and W/S Profile = Standard | | | | t
Electronics Forum | Tue Nov 27 19:50:23 EST 2001 | davef
So, which is it �falling off or tumbstoning�? Each has different causes. You say �It's apparent that these components were cured and in place prior to wave solder.� * Cure heat cycle maybe. But is the glue holding? I mean if your cure is real good
Electronics Forum | Wed Jul 28 18:51:52 EDT 2004 | gregoryyork
Found problem many years ago by chemical extraction and IR analysis, produces alarming amounts of plasticizer from under cured or incorrect mix of hardener to liquid photoimageable solder resist. Problems this causes are endless and many things blame
Electronics Forum | Tue Aug 24 14:49:21 EDT 2004 | Rush Fan
I was notified that one of our operators took it upon themselves to run a board assembly through our reflow oven multiple times when he discovered what looked like incomplete reflow. Based on this being done, its been asked of me how, if any, has the
Electronics Forum | Thu Jul 28 09:47:06 EDT 2005 | fctassembly
Hello Carl, The main reason there is little information on lead free soldering to ENIG is because most of the lead free soldering to date has been Japanese consumer products. To keep costs down, the major surface coating used has been OSP copper. It
Electronics Forum | Wed Sep 07 16:53:15 EDT 2005 | GS
Contact Cookson Electronic, they can support you with OSP solutions (ENTEK---) new formulations for Lead Free apllication. Regards GS --------- from a 2003 Cookson presentation: Objective Although Existing ENTEK� PLUS CU106A technology is suc
Electronics Forum | Thu Mar 01 16:43:59 EST 2007 | samir
My own personal "unwritten rule" has always been - no more that 3 times. Anymore than once, I'm not sure what the implications are. If you think about the mechanics of wave solder. It's around 200 Deg. F of preheat, and then immersed in 480 to 500
Electronics Forum | Sat Jun 19 03:11:25 EDT 2010 | sarason
I have used the Quick ? from I don't remember what company. But it was a smallish machine ie about the size of a washing machine. The heat/cool cycle was about 30 to 45 minutes. every thing had to be properly sealed or you would loose vapour, this va
Electronics Forum | Mon Dec 04 23:34:34 EST 2017 | jineshjpr
Dear Sir, Sanyo Denki Bi-Polar motor rarely rotates with actual speed while Picking up the component, Otherwise Stepper motor rotates with very slow moving speed by creating noise and same speed variation repeats while Placing the component. After co
