Yes, this appears to be unnecessary rework.  Your interpretation is correct based on the info you provided.  This lack of plating at the body of the component was not caused by assembly, but is simply a process indicator that the component mfgr needs to be aware of. See IPC-610, section 6.5.2, Exposed Basis Metal, for further detail.

So the question may be one of whether the finished assembly will operate correctly and reliably in its intended environment.

Have any pictures to share?

Roger


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Connie Korth
Sent: Thursday, December 09, 2004 9:59 AM
To: [log in to unmask]
Subject: [TN] copper exposed


        Good AM Techies,

        We have some resistors that did not take the tinning all the way to the
body.  There is some copper exposed by the body, but the lead in the solder
connection is good.  Per IPC-610, if copper is exposed due to deformation
or nicks/gouges >10%, it is a defect.  We have absolutely no deformation in
these component leads.  My decision was to leave them in the board.  We
have a Mfg. Engineer who wants to have them all replaced.  He feels I have
interpreted the IPC-610 incorrectly.  I feel that this is unnecessary
rework that could damage the PCB.  Any supporters out there?

        Connie M. Korth
        Quality Specialist
        Reptron Manufacturing Services, Hibbing
        [log in to unmask]
        218.262.8209

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