Electronics Forum | Thu Nov 04 07:04:04 EST 1999 | Pat Copeland
Just started having a problem with the solder on a board. Nothing has changed as far as profile, type of paste or setup. But yesterday we had the boards coming out of the reflow with horrible solder results. It appears on some components the solder i
Electronics Forum | Wed Nov 03 10:10:05 EST 1999 | John Thorup
This has come up a number of times recently and a search for intrusive reflow or pin in hole reflow will reveal several threads. Also a good resource is the link below. From what has been stated on many of these forums and my own pre-production tes
Electronics Forum | Wed Nov 03 10:04:18 EST 1999 | PL Sasso
Hi Wes, I was very interested in your S20 problem since I am the Customer Support Center Mgr. for Siemens EAE here in the US. This sounds like a solvable problem. Most likely, due to the random nature, it involves how the vision is locating the pcb
Electronics Forum | Tue Nov 02 09:29:21 EST 1999 | Wolfgang Busko
Hi Kevin, you could use a fixture for supporting the assembly. I think it�s a common solution for thin PCBs. For the design you could search the archive there are some tips on this already ( search for support, fixture, pallet ). hope this helps Wo
Electronics Forum | Sun Oct 31 23:58:54 EST 1999 | John A.
Do both sides of that board contain larger IC's and other large components or just one side?? If just one side contains large components, try running the side with the smaller components first, and then run the other side last. If that doesn't work
Electronics Forum | Sun Oct 31 19:34:43 EST 1999 | Pat Copeland
I am currently placing aprox. 95 to 100 1206 size ferrite beads onto a pcb and having difficulty solding these parts. They appear to be soldered when the board comes off the reflow, but you can flic the parts off by hand. We thought they were contami
Electronics Forum | Fri Oct 29 04:51:11 EDT 1999 | Wolfgang Busko
Hi Eom, no matter what size the crack is it�s a no-no and you should take any precaution to avoid this cracking. Ask your vendor if you are not sure which moisture level applies for your part. Follow the recommended handling specifications for moistu
Electronics Forum | Thu Oct 28 13:36:14 EDT 1999 | Bart Smith
I am a design engineer and have a circuit board design with a 292 pin BGA on it. The board manufacturer is experiencing a failure rate of about 2.8% on the BGA device due to soldering problems. This is my first experience with BGA. How does the 2.
Electronics Forum | Fri Oct 29 05:23:00 EDT 1999 | Wolfgang Busko
Hi Bart, that�s much to high. If that would happen to me my boss would tear my head off. For improving the yields you must find the cause for the soldering problems. What are the symptoms? What could be the cause for the symptoms? Could be design pr
Electronics Forum | Thu Oct 28 09:16:38 EDT 1999 | DaveH
Michael, You can try contacting National Training Center for Microelectronics in Pennsylvania. They are a "for fee" training center, but may be able to supply you with some basic information that would assist your research as a student. Try e-mailing
