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September 2015

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Subject:
From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 23 Sep 2015 15:29:51 +0000
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NO.
The inspector is always required to inspect the defects at the required magnification. If they are inspecting solder joints on an ASIC at the required 20X magnification and they see a particulate defect or some other defect where the required inspection magnification is naked eye, 7X referee, then they are to re-inspect at the lower mag requirement and if they cannot see it, then NO DEFECT. Most of the time, the customer does not want any unnecessary rework being done.  But there are exceptions to the rule, for example, if the particulate matter is conductive and bridges two conductors, then of course it has to be removed. But loose dust fibers, tiny smudges, stuff like that does not require documentation and rework if it is not visible under the required magnification. Especially if the board is coated.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Krug
Sent: Wednesday, September 23, 2015 9:23 AM
To: [log in to unmask]
Subject: [TN] Magnification for Inspection of Cleanliness

I’ll report later this week about Clumpy and Kloumpios assistance, but we’ve got a question about the interpretation of magnification to be used for inspection of cleanliness.

Both J-STD-001 and IPC-A-610 state if the presence of a defect cannot be determined at the inspection power, the item is acceptable.  For inspecting of cleanliness, magnification is not required but then a reference to a note indicates magnification may be required fine pitch parts are present.  Magnification may be needed to determine whether magnification affects form, fit or function.

If residues are not visible without magnification, but are visible under magnification, but do not affect form fit or function, are the residues defects?

Dick Krug, CSSBB, CSMTPE
Lead Process Engineer
Sparton Brooksville, LLC
30167 Power Line Road
Brooksville, FL  34602-8299
(352) 540-4012
[log in to unmask]


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