Electronics Forum | Sun May 08 23:55:06 EDT 2005 | vera1001
hi all: how time filies,our holiday is finished from May 1st to May 7th.
Electronics Forum | Thu Nov 21 06:36:30 EST 2002 | Ben
I'm doing SMT of lead-free solder BGA on FR4 Ni-Au PCB. The solder paste I'm using is Sn/Ag/Cu and reflow with peak temp at 240C. I found there are voids(1-2) in almost every solder joint(500 micron in dia) under xray. And the void size is violate th
Electronics Forum | Fri Nov 22 17:53:55 EST 2002 | davef
Search the fine SMTnet Archives for background discussion on BGA voids.
Electronics Forum | Fri Nov 22 15:59:43 EST 2002 | GSW
What type of reflow profile are you using ? There is a void reduction profile recommeded by some paste manufacturers, Try that it might help. Did you check the components or the board and see if they have absorbed mositure ? try baking the boards and
Electronics Forum | Mon Nov 25 22:08:05 EST 2002 | Ben
Thanks for the advise. I got the advise from my solder paste vendor to increase the time above melting point for flux outglassing to escape. I tried but no big help. For the moisture issue, actually I've try to bake both the PCB and components at 12
Electronics Forum | vsuresh |
Wed Mar 13 18:48:02 EDT 2024
Electronics Forum | Thu Mar 28 15:27:01 EDT 2024 | vsuresh
After cleaning also same issue
Electronics Forum | Thu Mar 28 19:23:35 EDT 2024 | linux
replace flow, vacuum sensor
Electronics Forum | Mon Apr 01 07:45:50 EDT 2024 | ormsystems
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Electronics Forum | Wed Mar 20 14:54:15 EDT 2024 | linux
Vacuum Low, Shows up on changeover when the head picks a different size nozzle, remove mesh filter, unplug the clear pipe from the top of the head, put a small amount of alcohol down the pipe and blow it out with the air gun, You should check for a h
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