Electronics Forum | Wed Apr 13 04:09:15 EDT 2005 | simmcircuits
Hi, I need help with our MPM UP2000, the stencil and the lamp boards won't turn off completely, they are both on at the same time. Turning it on would only make it brighter, turning it off will just lose the brightness but the lamps are still on. I h
Electronics Forum | Tue Sep 16 10:15:33 EDT 2003 | Gabriele
Hi James, is it your oven a convection forced air ? if yes you should check if air flow speed is too high. Also, some time ( do not smile pls !!) it could be a metter of magnectic field inside oven tunnel. The SOT leads are normally madeby A-42
Electronics Forum | Wed Oct 10 13:49:12 EDT 2001 | stepheno
I recently started at a new company. They have a variety of bare PCB's and most have aprox. 20 variations. Maybe about 1/3 of each board on average are non-populated locations. They buy one stencil for each PCB but then use scotch tape to block of
Electronics Forum | Wed Apr 19 09:07:44 EDT 2006 | russ
Many times a pad that has no signal trace going to it will come off. It does happen from heat and time as noted before. Somtimes even the best rework person will remove them. If this can not happen in your situation I would recommend that you use
Electronics Forum | Wed May 28 19:21:09 EDT 2014 | hegemon
Just from the look of things (a picture) I would first guess it is a contamination problem on the PWB. Check over all your handling practices. Make sure the PWBs are NEVER touched by bare hands. I would not rule out the Black Pad phenomena, but i
Electronics Forum | Tue Sep 16 09:59:26 EDT 2003 | James
I am having a problem with SOT23 moving off their pads during reflow. We did not have this problem yesterday. On the pads and surrounding area looks like a lot of flux spatter. I looked through the threads but they didnt help me much. I know what 3
Electronics Forum | Fri Apr 21 18:02:16 EDT 2006 | SD
You didn't explain exactly how you are reworking the BGA and at what point the pad comes off. Assuming it's from an iron... The biggest cause of lifted pads is too much heat. Whether it be the iron temp or the amount of time the iron is on the pad
Electronics Forum | Thu May 18 10:48:09 EDT 2006 | vikkaraja
Hi There, I used to have a similar problem with all of our new heller ovens. I converted them with fan blower controller kit. It is really easy to do or you can have done. Its about $900/oven. For now if you do not feel like investing any money , go
Electronics Forum | Thu May 18 08:31:28 EDT 2006 | marc
Hi James Short answer... yes... long answer...impingement velocity is excellent for heat transfer but it also is a higher risk of moving components. Variable speed blowers allow you to reduce the speed / impingment and more than likly your compone
Electronics Forum | Thu Sep 18 15:29:59 EDT 2003 | Gabriele
Hi all, by reading along those thread (SOT23) and Tan outgassing I learned plenty of things. My first time approacing this kind of Q$A Forum, very intesting tech communication way. Any way, the path of magnetism effect was chosen when time ago we met
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