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June 2005

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Subject:
From:
"Valerie St.Cyr" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 14 Jun 2005 12:58:13 -0400
Content-Type:
text/plain
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text/plain (104 lines)
Eric,

My guess is that this is a board that your company orders over and over
again from the same supplier; that the supplier had excess boards on their
last run and they put the excess in inventory in a stockroom. When the
next order came in, they filled it with the excess that they pulled from
the stockroom. And those board were now dusty (although it is hard to
imagine them all dusty - it should only be a few...). Anyway, if they get
a rejection they should learn that when they pull boards from a stockroom,
they should cycle them back through the shop's last cleaning process.

The other scenario is that they aren't stock boards, but they are
production boards which "missed" the cleaning step after routing. Is the
dust a white powder?

Anyway, bottom line, you should get clean dust free boards. No one should
have to deal with the dust which could muck up the screen printing ...

Valerie





ekalgren <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
06/14/2005 11:54 AM
Please respond to TechNet E-Mail Forum; Please respond to ekalgren


        To:     [log in to unmask]
        cc:
        Subject:        [TN] PCB rejection criteria


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

[log in to unmask]




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