To whom can help.

PRINTED BOARDS "GOLD PRINTED CONTACT" CONTAMINATION.
The IPC- 600 (par. 1.5 accept. criteria) recommend
1.75 X magnification to inspect the applicable attributes
and in case of doubt increase the magnification up
to  40 X.
Then the par. 2.7.1 (surface plating - general) defines
which are the criteria / dimensions for: Target - Acceptability
and Non Conforming.

QUESTION:
In my opinion two possible interpretations are applicable:

1) If the inspector doesn't see any surface defect at 1.75 X
   magnification, the part is acceptable. In case something
   (potential defects) is observed, the inspector has to increase
   the magnification up to 40 X max and determine the size of
   the defects for acceptance or reject.

2) The inspector has always the objective to determine the
   size of the printed contact imperfection regardless from the
   magnification degree. It means, he has to inspect always the
   printed contact surface up to 40 X max, to verify that any
   possible imperfection be acceptable against the criteria.

WHICH ONE OF THE TWO INTERPRETATIONS IS CORRECT ????

Thank you very much for your help.


Michele MANCINI
Quality Eng. Mgr.
IBM Italy - Vimercate
e.mail: [log in to unmask]
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