Electronics Forum | Tue Sep 20 11:59:06 EDT 2011 | SheanDalton
Check specific gravity: According to a quick web search, the specific gravity should be 0.813 ± 0.003. If you have records of the specific gravity, compare current reading to past readings. Check pressure near stone: if you have records, compare
Electronics Forum | Wed Feb 23 12:42:28 EST 2011 | davef
If we understand correctly, your SMT solder connections remelt when passing through the wave solder machine and your QA-people don't like it when that happens. It's nice not to remelt this solder, but as long as the board meets your acceptance stand
Electronics Forum | Thu Jun 28 15:38:37 EDT 2012 | davef
Matthew: That you can get solder flow when hand soldering, but not when reflow soldering, seems to be telling you that you're not getting the connection warm enough during reflow. You need to have those connections liquidous + 20*C for at least 5 sec
Electronics Forum | Wed Jun 27 21:53:54 EDT 2012 | davef
Questions are: * When you rework these pads, can you get solder to flow on the pads with a soldering iron? * When you profile the board during reflow, what is the temperature on these pads as compared with other similar pads in the vicinity?
Electronics Forum | Wed Feb 26 04:28:39 EST 2014 | chongns
Hi All member I have a problem on the stable down the color of the white solder mask PCB. first, i tough the color differences was cause by the solder mask ink, but after a close look, the color change are cause by the copper under the solder mask
Electronics Forum | Wed Jun 27 11:13:44 EDT 2012 | mosborne1
We are seeing PLCC socket leads not soldered in our SMT process. We are using a KIC thermal profiling device and we are on 50% greem light process window. All other solder joints on the board looks great. The solder flowed what looks like perfect on
Electronics Forum | Fri Apr 06 04:10:25 EDT 2001 | kensmoke
We recently had a multi block panal change at the vendor Now the production lines are producing solderability defects in great number. The makeup of the pcb is a type of fiber glass mask green in color and pads with no tinning just copper lands.
Electronics Forum | Thu Jun 28 09:54:06 EDT 2012 | mosborne1
Dave, They rework fine. All solder joints on the whole board look great especially for lead free sac305. Here are the reflow specs: SAC305 no clean solder paste – Kester EM907 Kic thermal profiling device – 50%process window green light profile. • M
Electronics Forum | Wed Feb 23 01:06:06 EST 2011 | kemasta
Hi all Recentlt I encounter a issue, the solder paste was not dry after wave. Mostly happen and the end of the board. It is rare case, 1 day happen about twice. But to achieve our quality target, I still need to overcome this issue. I use Alpha OM-
Electronics Forum | Mon Sep 28 08:35:15 EDT 1998 | Earl Moon
| I recieved a pack of sensitive IC's that said they needed to be baked befor certain processes. If I need to do rework, do I have to bake prior to single soldering of these IC's. Or can I just place one as needed by hand with out baking? Any info
