Electronics Forum | Thu Jul 28 11:14:48 EDT 2005 | jh0n!
On chips, none - 1:1. Those are 1206 chips, either .010 or .015" between them. I've never seen one bridge. Some *rare* billboarding. That's it. *shrug* These QFNs, tho....
Electronics Forum | Wed Jul 27 22:09:49 EDT 2005 | Ken
My policy is not to mix them. You have zero cross contamination potiental with this policy.
Electronics Forum | Wed Jul 27 17:53:25 EDT 2005 | GS
Is your Moisture Sensitive Device handling process correct ? Some time internal delaminations beave like the pbm you have. Regards... GS
Electronics Forum | Fri Jul 29 06:45:27 EDT 2005 | davef
See: * The supplier guy says, "The assembler blanked the pooch." * The assembler guy says, "The supplier blanked the pooch." Cut the scomponent is half, do a failure analysis, and determine who is correct.
Electronics Forum | Thu Jul 28 08:02:09 EDT 2005 | stepheniii
Check the pick postion in the feeder. If the nozzle is picking at the edge of the component, it could flip it. BTW what kind of machine are you using? Stephen Olan
Electronics Forum | Thu Jul 28 08:02:39 EDT 2005 | bobpan
When we see the upside down part problem its typically feeder related....either the feeder is making the part jump or the z is taught tooooooo deep causing the part to jump before its in its pick location. chow
Electronics Forum | Thu Jul 28 08:16:33 EDT 2005 | grantp
Hi, Your not using vibration feeder here are you? I have seen this a lot with vibration stick feeders. Regards, Grant
Electronics Forum | Thu Jul 28 08:35:58 EDT 2005 | jdengler
Most likely a feeder that has a rough advance. This can cause the part to flip in the tape before the nozzle gets it. Jerry
Electronics Forum | Thu Jul 28 13:12:49 EDT 2005 | SuMoTe
I'm thinking vibe feeder as well. I saw this alot on older machines (Quad IVC) vibe was set too high making parts jump around. If it is a vibe feeded, look for spillage behind the feeder base.
Electronics Forum | Fri Jul 29 19:21:59 EDT 2005 | Jason Fullerton
Definitely feeder related - we get it all the time on those package parts. If you can, slow the tact of the feeder advance a bit (if it's on T&R). We also don't catch it at placement, but at pre-reflow visual or AOI.
