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November 2008

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Subject:
From:
Kevin Glidden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kevin Glidden <[log in to unmask]>
Date:
Tue, 11 Nov 2008 22:46:51 -0500
Content-Type:
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Hi everyone,

 

We have an issue with loss of plating adhesion on some ImAg finished PCBs.
The affected area is small and consistent in location across the PCBs with
the defect.  All other areas seem to be ok when tested per a tape test.  The
PCB supplier is proposing to visit and "repair" them here at our site.  I
was not even aware plating could be repaired, let alone away from a PCB fab
shop without plating lines etc.  Is this even possible?  I am very hesitant,
as I very seriously doubt the control and/or quality of the "repair"
process.  At the very least, how would thickness be controlled?  We specify
micro 5-12 inches in thickness per IPC-4553, and the overall PCB is to meet
IPC-6012 Class 3.

 

Anyway, they described the process as follows:

 

I will send you the solution by Fedex in a small bottle. Once you have
received it, I will come to your facility and repair the boards.  I will
need a hot plate and Pyrex container to heat-up the solution to 120 F. Do
you have these two items? Otherwise I will bring them with me. I will clean
and repair the boards locally.  Once it is done, I will do the tape test to
make sure the adhesion of the silver is adequate.

 

My little voice is screaming "NOOOOOOOOOOOOOOOOOOOOOOO!!"

 

Thanks in advance,

Kevin


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