Electronics Forum | Fri Jun 26 19:02:09 EDT 1998 | Rin Or
I am very interesting of getting information about the criteria inspection of BGA. Example, what are percentage allowance for void, solder joint volume etc.. Any information feed back will be greatly appreciated.My factory just install the Nicolet NX
Electronics Forum | Tue Apr 28 09:55:32 EDT 1998 | Earl Moon
>1. What are the two files that will allow you to start layout of a > >printed circuit board that has no Mentor Graphics schematic? > > > >2. In DA, what is a ripper? > > > >3. How do you kill a process in UNIX? Thanks, Earl Moon
Electronics Forum | Tue Aug 07 20:53:14 EDT 2001 | davef
slowing-down the conveyor to allow the solder to heat these balls more. But that may not be the answer, because if the flux is exhausted, more heat will not help. Then if the flux is exhausted, the answer is to crank the belt. Two different answer
Electronics Forum | Tue Aug 14 17:55:01 EDT 2001 | Boysen
Are you using a water soluble paste? Older generations of water soluble paste are notorious for voiding. Some of the new generation water soluble fluxes allow a much wider process window.
Electronics Forum | Thu Sep 06 11:17:13 EDT 2001 | Steve
I may be wrong, but I'm thinking that nitrogen has less effect on solder bridging as does the amount of solder that is present. Nitrogen allows better wetting becasue there are no oxidation effects. If you have solder bridging problems, look at the
Electronics Forum | Thu Sep 27 21:19:56 EDT 2001 | stimpy
>> try a linear ramp to allow the entire pcb to heat up evenly. What is your conveyor speed?
Electronics Forum | Tue Dec 18 16:49:17 EST 2001 | davef
J-STD-001 - Requirements For Soldered Electrical & Electronis Assemblies is the governing document. It defines no specific limits like you mention. It states words to the effect that preheating should not do bad things.
Electronics Forum | Wed Jan 02 08:04:09 EST 2002 | wsanita
The only time i have seen this (5 years) has been from operators not allowing the magazines to shut off before pulling them out of their slot. Check the handles on the front of the magazines. If you see some dings on them there is your answer. Good l
Electronics Forum | Fri Feb 01 19:07:57 EST 2002 | fujiguy
Yes Smema is used in the industry. It allows the equipment of different manufacturers to comunicate with out extensive rewiring. Both SMEMA 1.0 and 1.2 are used. An experienced SMT manufacturer wil include both for options.
Electronics Forum | Tue Apr 23 07:51:39 EDT 2002 | cfraser
I too have experienced this problem on many occasions. Try turning you wave temperature down just a bit. If you spec allows for this it will help. The condition will not totally go away but reducing the heat will help. Of coarse you other option in a
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