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January 1997

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Subject:
Re:Re: FAB-Dish downs in copper circuits
From:
[log in to unmask] (DAVY.J.G-)
Date:
Tue, 28 Jan 1997 09:27:56 -0500
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     Mike Covell's explanation of the dish-down in the circuit trace (hole 
     in the resist laminator roll due to attack by sulfuric acid) is en- 
     lightening.  It makes me wonder how many more boards produced on that 
     laminator are at risk, and how many other rollers also have holes.  
     This seems like a problem that would be very easy to miss.  A dish- 
     down would surely be much more difficult for a person or a vision 
     system to detect than a mouse-bite.
     
     Gordon Davy

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