Electronics Forum | Thu Apr 19 02:49:07 EDT 2007 | ray
I observed some black dot or some oxidation occured on chip termination on pcba reflowed fews weeks ago as buffer stock. The solder joint and fillet wetting is good and shinning. It is an acceptable or defect condition per IPC standard/requirement? W
Electronics Forum | Mon Jul 16 16:42:40 EDT 2007 | pnguyvu
Hi Jacky, It seems you have solder bead problem, beading occurs when the solder paste brick splatter as a component is placed into it, after reflow, the splatter becomes a spherical solder ball. Hope this will help. Steve USA STENCILS
Electronics Forum | Fri Jul 20 16:39:18 EDT 2007 | john_smith
Jacky, we have had a similar problem. We needed to go to a smaller nozzle and also check your vacuume system and air kiss.Could be after placement when the machine blows air to insure the part is off the nozzle that it is effecting the solder brick.
Electronics Forum | Tue Sep 04 02:28:17 EDT 2007 | philip_yam
Any one has experience over solder voids in oscillator capacitor joint could result in high phase noise during the digital performances test? The noise signal was gone after solder touch up. What could be the root cause of the high phase noise?
Electronics Forum | Wed Sep 12 11:01:49 EDT 2007 | leemeyer
We have an Omni 7. We were having problems where blowers wouldn't start. Turned out to be the start capacitors and not the blowers. I replaced all of the caps and haven't had any issues since.
Electronics Forum | Mon Oct 22 20:41:32 EDT 2007 | jkhiew
Hi Dave, The solder has tended to wet the component termination of Ag/Pd (chip capacitor) but has not wetted the pads, whereas the solder has wetted both termination & pads when using Ag/Ni/Sn finishes. Thks
Electronics Forum | Thu Nov 01 21:05:31 EDT 2007 | davef
no inspection * Failing to meet expectations => inspection In asking if you observed the problem at incoming inspection, we should have asked the question differently. Have you observed the problem in stock items, prior to assembly?
Electronics Forum | Mon Nov 19 21:25:07 EST 2007 | davef
J Webster: Can you send / post pix of your cracked capacitors? What do you think about our assumptions? They are: * No flex in end-item use * Supplier has no defective packaging * No hand soldering of these parts * No impact or flex from ATE * No H2
Electronics Forum | Sun Dec 09 17:41:34 EST 2007 | airforcess927
The only thing JVC has told me was to take it the whole way to New Jersey to the closest service center.
Electronics Forum | Sat Dec 22 07:14:15 EST 2007 | andy1975
My understanding is that if the delta T was 4deg/sec then chip capacitors would delaminate. I have no evidence to support this just an engineers advice. Andy
