Electronics Forum | Thu Feb 24 23:11:51 EST 2011 | kemasta
HI I have this BGA short issue, I took x-ray image, the solder ball having big void. We suspect the pad on BGA was oxidie. Reject percentage quite low, only 5 out of 6000. But after the BGA re-ball, is work fine. Anyone have any idea to trobleshoot
Electronics Forum | Fri Nov 04 13:04:36 EDT 2011 | austinpeterman
I have come to the realization that the root of all of our coating issues stem from one source. We are unable to control the viscosity of our coating. I am ignorant on the subject. Is there a proven method to consistantly produce the identical vis
Electronics Forum | Tue Jun 12 17:13:05 EDT 2012 | kmots15
We only clean ones that are rejected (typically 1 out of 250 or more). Very well could be an issue with the boards supplier if your having a inconsistency in plating/hasl process, under a scope do the fiducials look the same between boards? More like
Electronics Forum | Wed Jun 13 01:01:10 EDT 2012 | isd_jwendell
I clean all fids with a fiberglass brush pencil so that I know there will be no rejects (it doesn't take too long). The problem is the machine lighting. My Essemtec machine uses a light ring (red LEDs) around the cam. Here's one of many documents th
Electronics Forum | Wed Aug 15 14:12:49 EDT 2012 | hegemon
I saw a similar problem a couple years ago. In our case the issue was the original manufacture of the devices. The high temp spheres were misaligned from the beginning, and subjecting these parts to SMT reflow made the problem worse, and created is
Electronics Forum | Tue Jan 15 22:33:32 EST 2013 | boardhouse
Hi Samuel, The issue your seeing is caused by lack of control of your board shops Immersion gold plating line. I would reject the order back to them. Their gold line baths need to be checked or they had a poor rinse after nickel plate before adding
Electronics Forum | Mon Feb 11 11:28:43 EST 2013 | marcelorotofrance
yes, Bob, I agree about that. But I can't afford them by now. But the problem is that I had to reject almost the 50% of the feeders that came with the machine, because are useless even for 1206. I also work with a very old but faithfull Juki, with it
Electronics Forum | Mon Feb 11 14:40:39 EST 2013 | marcelorotofrance
Well, actually both the feeders and the machine were bought "as is", so these are not in their better shape. Even more, the feeders are not the machine's originals and don't match each other ; "Un paisano de cada pueblo", as we say here. Some units
Electronics Forum | Thu Apr 11 14:11:10 EDT 2013 | dontfeedphils
If it's using the laser alignment try changing the part type to "SOT" instead of chip, and then enter the dimensions for only the body of the component. The "Chip" setting will measure the part half way down the body, the "SOT" setting will measure
Electronics Forum | Fri Jul 26 11:20:33 EDT 2013 | gnus
Hi all, I'm having issues placing 7 pin DPak packages. I'm using mechanical centering with four centering phases (one for each orientation). Tool used is A24S. Machine picks up the part but will reject it when centering the part. I have measured all
