Electronics Forum | Fri Mar 21 10:28:27 EST 2003 | mantis
Sorry i didnt explain it vey well,the parts that are misaligned are always sitting next to these particular tanatlum capacitors.It affects 0805 parts and A tsop36 and can even cause a short on a bga right in the corner where the tant sits.If you chan
Electronics Forum | Thu Mar 27 11:39:27 EST 2003 | kenlchin
Hi,mantis, I has experienced this case.when we run a model ,misalignment and tombstone of some 0805 resistors and 1206 caps always occured.we have taken many actions,such as adjusting reflow parameter&printing parameter,checking pcb and parts soldera
Electronics Forum | Fri Mar 21 09:08:53 EST 2003 | mantis
Hi all, I have a strange problem,while building a large 15x15inch 3.5mm thick Pcb.During topside reflow i am experiencing some misaligned parts and even bridging on a bga that are sitting very close to a D size tantalum cap.The strange thing is that
Electronics Forum | Thu Mar 08 22:24:45 EST 2001 | davef
Sounds like you've done a good job of troubleshooting. Two thoughts are: 1 An alternative to using a hotter flux that the others mentioned is to use components with more solderable terminations. [A firm grasp on the obvious.] 2 You spoke about
Electronics Forum | Fri Mar 09 08:25:13 EST 2001 | CAL
We have seen some problems with component end cap solder terminations not being symetrical. i.e. If one end on the cap has a larger solder ternination this sometimes is enough surface area during reflow to lift the opposite side of the component. We
Electronics Forum | Thu Mar 08 16:02:18 EST 2001 | gsmguru
Have you considered a different solderpaste ? A different flux chemistry may help. The metals content wouldn't have to change. Just go after a slightly more aggressive flux.
Electronics Forum | Tue Aug 24 11:29:59 EDT 1999 | Gary Kemp
Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? Any help would be appreciated. Thanks.
Electronics Forum | Sun Dec 03 15:35:44 EST 2000 | Michael Nguyen
Wow. And I thought I was the only one having problem with ceramic capacitors.I too am having problem with cracking ceramic capacitors 1206 package.We changed vendors and still having the same problem. I had to reverify my entire process and I had to
Electronics Forum | Thu Mar 08 16:02:58 EST 2001 | arturoflores
You did not mention to change the solder paste to another formulation or brand.We used to have that kind of non wetting problem on 0402 cap when we used Alpha's LR737(63/37) Type 4 No Clean and the solution was to change the solder paste to Alpha's L
Electronics Forum | Tue Feb 28 16:58:39 EST 2006 | PWH
Too fast heating/cooling rate in reflow (look at mfg's spec.). Z "overdrive" on pick and place or chipshooter though unlikely I would say. Depanelization method (bending a scored board to break it is tough on things). Bad PCB design - cap. too clo
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