A couple more comments from your additional remarks.


If it is observed on one side of the panel and they appear ragged as opposed
to uniform semi-circles I would suspect dry film developing, specifically
the solution manifold jets becoming clogged.

A simple test and solution, unscrew a couple jets and see what kind of gunk
comes out.

If it is ragged and appearing on both sides, check solution temperature,
we've seen this occurring most frequently in the winter time, especially in
the mornings due to carelessness in running product before the especially
cold bath is not at temperature yet.

If they are on one edge of traces I would look at the plating bath, as
bubbles tend to adhere to the top edge of traces when in solution. Find out
of there is a uniform method of placing panels in the baths, and when placed
in that fashion are the mousebites you see on the top edge of traces...

A simple test and solution, run a test panel of the same image you see these
on most frequently, every minute smack the rack holding that panel with a
rubber mallet, run another test panel as normal. If you see mousebites on
the idle panel and not on the abused panel, improve rack agitation adding an
abrupt 'bang' into the cycle every minute or so.

Franklin

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