Electronics Forum: after (Page 126 of 656)

Solder Balls in Vias

Electronics Forum | Tue Jun 04 15:52:44 EDT 2002 | Hussman69

Closed by solder mask? At any rate, still sounds like wave solder. Take a look before and after wave. That should tell ya.

Production Line Setup

Electronics Forum | Fri Jun 14 16:51:28 EDT 2002 | nuezmaster

Thanks for all the advise. I was able to recruit one person for a week to inspect boards after pick and place and was able to show a 65% efficiency increase for that line. Now I have a req. for 5 more people. Thanks, Nuez

MELF component short togehter

Electronics Forum | Wed Jun 12 22:35:03 EDT 2002 | jkhiew

We had alot of problem with melf diode short together after reflow soldering. The clearance is about 0.8mm & we used "v" shaped opening . PLease comment !

MELF component short togehter

Electronics Forum | Thu Jun 13 05:46:34 EDT 2002 | jax

After reflow, Are the end terminals of the melf packages touching or is it a paste bridge? What type of reflow are you using? IR?... Convection?

pcb plating

Electronics Forum | Sun Sep 15 21:44:41 EDT 2002 | jason

Hi Dave, Immersion Ag has poor surface appearances after reflow or rather tarnished, while Immersion Tin requries higher temp. Probably that's why Immersion Ag is more preferred.

over-shelf-life PCB

Electronics Forum | Wed Jun 19 21:29:00 EDT 2002 | redmary

we have a big inventory of over-shelf-life PCB, most of them are stored over 2 years. Could we ensure all these over 2 years PCB will not cause significant quality issue after assembly? and where could I find the related specification?

capacitor leakage

Electronics Forum | Wed Jul 10 22:32:46 EDT 2002 | redmary

i just find the gap inside the component from the cross-section, it indeed exists the interal crack, not solder joint crack. but why the failed capacitor is well after some time. and the other suspicion is the quality of the component.

Is Anyone?

Electronics Forum | Fri Jul 26 01:56:28 EDT 2002 | Dreamsniper

Here Downunder, I spoke with few SMT equipt suppliers and they said that many small companies bought machines since after the Sept. 11 incident. Info Tech is really down here but electronics manufacturing is rising at a slow rate but it's still hard

BGA Reliability

Electronics Forum | Sat Jul 27 14:30:56 EDT 2002 | Juan C. Ruiz

Do you have any picture or reference how can we determine black pad or plating contamination. I have heard about a lot of problems regarding BGA's and normally these components are only replaced or heat it and that's it ,after that the boards are wor

Fog Test

Electronics Forum | Fri Jul 26 18:28:51 EDT 2002 | blnorman

Actually this is for an automotive instrument cluster. From what I've been told back in the good old days we switched fluxes and after the car sat in the sun (and heat) a haze developed on the inside of the panel that was attributed to the flux.


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