Check the dryfilm to etch dwell time. Also lighting and racking
        techniques and locations if the sat for any long length of times.
        (Sounds like dryfilm related)
        Groovy
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Subject: Plated Through Hole Rim Voids
Author:  [log in to unmask] at SMTPLINK-HADCO
Date:    12/18/95 10:30 PM


We have experienced a random problem with three or four parts relative to rim 
voids.
     
In some cases it was part of the lot and in others it was the whole lot. 
     
They have been partial, full, top and or bottom. (no consistency) 
     
They are typically one to two mils down from the surface copper and one to 
three mils in height. 
     
They are not specific to any hole size. 
     
We use Dupont APG715 Dry Film, and develop on a Atotech/Chemcut horizontal 
system using Potassium Carbonate.
     
     
     
I would appreciate any suggestions, as to the cause.