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August 2008

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Subject:
From:
Lum Wee Mei <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lum Wee Mei <[log in to unmask]>
Date:
Sat, 16 Aug 2008 13:23:16 +0800
Content-Type:
text/plain
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text/plain (21 lines)
Hello,
 
Prior to assembly the PCBAs onto the modules, inspection has been done to confirm there is no presence of stain around mounting holes for either modules or PCBAs. However, after ESS when the PCBAs are removed from the module to be conformal coated, black stain marks are noticed around the mounting holes for modules and PCBAs. All PCBAs have a perimeter of tin-lead plating to provide effective grounding between PCBA and module.
 
The mechanical group has ensure all modules are thoroughly cleaned before the assembly. What would be the cause of the black stain and is there any long-term reliability issue? The mech group has tried using Acetone to removed the stain but without any success.
 
Looking forward to your reply and thanks in advance.  
 
Thanks and Regards,
~ Wee Mei ~

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