Electronics Forum | Mon Dec 13 16:25:37 EST 2004 | saragorcos
Hi Scott - No clean assemblies have a very low tolerance for processing residues, and long term reliability is compromised if residues from incoming bare boards, components, or un-solublized flux residues are not dealt with. It is critical to contro
Electronics Forum | Fri Feb 18 11:54:21 EST 2005 | carterhoward
Hi frank, At first we did see some issue with moving the boards. We placed the AOI�s in as central location as we could. Basic we do first articles and sample QC�s from the less critical locations like paste inception and TH. And then run 100% QC o
Electronics Forum | Tue Mar 01 10:31:26 EST 2005 | Greg
QC --> Touch-up --> QC --> Assembly After SMT all PWB goes to QC, QC Inspects and marks all that needs rework then PWB's goes to Touch-up to fix what QC marked for rework. After that All reworked boards goes to QC for another verification and stampi
Electronics Forum | Thu Jul 14 16:07:16 EDT 2005 | saragorcos
Here is a link to a specific article about cleaning no-clean assemblies: http://www.residues.com/pdfs/Clean_No_Clean.pdf Our facility does a lot of contract cleaning and cleanliness testing for various companies around the world, and that study s
Electronics Forum | Tue Aug 30 12:08:09 EDT 2005 | slthomas
The answer for us at my previous employer was water soluble flux. Wash the board, no residue. If you're not set up to wash (needing a washer, DI water source, waste treatment, ventilation, etc.) it can be expensive and space consuming. Do some resea
Electronics Forum | Mon Oct 31 14:46:54 EST 2005 | valuems
Hello Did you just buy this machine on the used market? There is a possibility that the stencil is not height on all 4 corners ( from the center nest assembly. I don't under stand " the under stencil wiper is not working correctly". This is about
Electronics Forum | Thu Nov 10 21:15:39 EST 2005 | davef
Years ago, there was discussion of making a "IPC-A-640" to define requirements for assemblies comprised of more than a circuit board assembly. We don't know what happened after that. As an alternative consider: Telcordia GR-78 - Generic Requiremen
Electronics Forum | Thu Nov 17 13:04:58 EST 2005 | tommyttr
AOI should be operated by an INSPECTOR! Inspectors do not operate assembly machines or automated assembly equipment, why would an operator run an Automated Inspection? Are your operators certified to IPC standards to make calls on bad solder joints o
Electronics Forum | Thu Dec 01 21:30:31 EST 2005 | davef
Primary methods used to test assembled circuit boards are: * Automated test equipment [ATE] * Manual bench-top functional test equipment Assembled printed circuit board ATE market segments are: * In-circuit ATE * Functional ATE * Boundary Scan AT
Electronics Forum | Fri Jan 20 09:17:59 EST 2006 | George
Hi "theSaint", We are using SN100C in our wave solder machine. As far as the solder itself, the wave process follows pretty much the same concept as leaded solder. You bring the assembly temp to 90 C or more before the actual wave. Sometimes for mul
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