Electronics Forum | Mon Apr 18 11:26:38 EDT 2005 | davef
Whenever we hear "gold" and "balls falling off", we think of black pad [hypercorrosion of nickel]. What does your EDX show?
Electronics Forum | Thu Apr 14 09:21:52 EDT 2005 | pr
What kind of wave are you using? Is this an old job and a new problem? Sounds like dross shorting to me, Make sure the wave is flowing over the back plate (at least when the board hits it). good luck, pr
Electronics Forum | Thu Apr 14 11:03:51 EDT 2005 | patrickbruneel
All possible causes aside, how can a dead short pass your ICT unless the connector is not probed.
Electronics Forum | Fri Apr 15 09:10:09 EDT 2005 | Dhanish
The biggest problem I am having is the X-Ray and ICT could not detect this shorts.ICT could not detect because onboard measurement shows Zero even without the Hair line shorts.With Hairline there is no difference in the impedance value for ICT to fai
Electronics Forum | Thu Apr 21 11:49:24 EDT 2005 | russ
Definitely would help when doing the search's. I always find a numerous amount of suggestions but you're right, you never know if anything worked! Russ
Electronics Forum | Thu Apr 21 12:39:10 EDT 2005 | patrickbruneel
Thanks Russ I must have caught you on a good day I'm not used to see you agree with me. Just kidding (couldn't resist)
Electronics Forum | Fri Apr 15 13:46:50 EDT 2005 | steve
They can be expensive and if your using water soluble chemistry you will have to immerse the pre-form into flux. Asking the vendor to provide flux with the pre-form I believe it would dry out prior to use.
Electronics Forum | Fri Apr 15 16:14:49 EDT 2005 | davef
Jim Zanolli of Teka Interconnect did an "OnBoard Forum" a couple of years ago [ http://www.smtnet.com/forums/index.cfm?CFApp=2&forum_idx=44 ]. He certainly would be a good point of contact.
Electronics Forum | Tue Apr 19 09:09:28 EDT 2005 | russ
Here is one reason- It eliminates the viscosity change during printing operation from the paste warming up and getting thinner. I would contact your paste supplier and have them give you the full list.
Electronics Forum | Fri Apr 22 19:43:01 EDT 2005 | steve
And don't re-refrigerate the paste. It's fine left out at room temperature and sealed. If you want to know why simply ask and the next 8 respondants will tell you.
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