Terry,

Try this on for size:
The automatic plating racks are developing opens or high resistance 
connections leaving seemingly random boards with thin copper.  Further 
processing removes the remaining copper and ... there they are... Voids.

Need to number your plating racks and keep track of which panels are run 
on which racks.  In a past life, a small mature Baker Bro. line would 
generate 2 to 4 bad racks per quarter.

The correct thing to do would be to buy another set of racks and do a 
wholesale replace and repair every 8 - 18 months.  I am sure your local 
rack man would love to help you out.

There are many other possibilities.  I will let others tell you about 
them.

George Franck

Whoops, sorry I did not copy the original question from Terry, 
[log in to unmask]

-- 


George Franck Jr
Raytheon E-Systems
Product Assurance Engineer
Falls Church Va

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