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Eric,
I would guess that the dust you see is dust from the routing or punching of
the board surface. I would not accept them. Particulates can get in the
way of glues, solder joints, etc. In my opinion, it is indicative of a
sloppy manufacturing environment. You have to invest time and effort
having your people brush off the boards. Should not happen.
Doug Pauls
ekalgren
<ekalgren@CHELTON
MICROWAVE.COM> To
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06/14/2005 10:54 [TN] PCB rejection criteria
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ekalgren
<ekalgren@CHELTON
MICROWAVE.COM>
Good morning everyone,
I've got a question on bare PCB's. These are relatively simple boards that
have been red flagged in incoming inspection for having scratches in the
soldermask that expose the underlying copper. Now, even I know that this
is
truly a defect. QA has also written up the entire lot of boards for being
dusty and a couple of the lot for having "excess solder." The excess
solder
is just a couple of PTH's that are partially filled by the HASL. I'm not
sure what the dust is but it blows off easily and doesn't seem to be
affecting anything other than the inspector's sense of cleanliness.
My question to all of you out there is: how should I handle the dust issue?
Is this typical of boards coming in from the shop and should I tell the
inspectors to go easier in the future or do I demand spotless, dust free
boards from our supplier? I don't want to accept junk but at the same time
I don't want to drive costs up by over inspecting. Where does one draw the
line?
Thanks in advance,
Eric Kalgren
Manufacturing Engineer
Continental Tool and Microwave Company
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