Just to add a tiny note on bare boards, and/or componentry in general:
proved extremely useful here to run one board of each incoming batch or
revision
through the WHOLE process = incl. test.
Some of the surprises from 'protel glitches' and hairlines from platers do
escape
even most diligent Inwards.
pk
-----Original Message-----
From: Gabriela Bogdan [mailto:[log in to unmask]]
Sent: Friday, 2 June 2000 2:48
To: [log in to unmask]
Subject: Re: [TN] PCB Inspection
Michael,
Your problem is very real, we perform incoming inspection for printed
circuits.
I will not go into many details, but :
Visual inspection is done for each lot on a sample basis, as well as
dimensional
testing.
Cross sections for copper thickness in holes and solderability are done
following a
skip lot program based on supplier, number of layers, PCB, and supplier
history.
We try to order only from suppliers with good history, thus we can widen the
intervals
between tests.
New suppliers are tested for each lot for a while, and if successful, they
enter the
skip lot.
We are a CM , and do the purchasing too, being totally responsible for the
assemblies.
Gaby
Michael Blackburn wrote:
> The company I work for is in the process of moving from inspecting
incoming
> pcbs to a "dock to stock" program. Also, we are outsourcing more of our
pcb
> assemblies and the feeling is that the CM should be responsible for the
> quality and reliability of the bare board.
>
> Does anyone have feedback about dock to stock programs? What kind of SPC
are
> you doing? Is a thourough audit of the board vendor and CM enough? What
kind
> of scrap/defect rates are you seeing?
>
> The reason I'm asking about this is because in a recent post about baking
> boards, someone responded that they were doing copper plating thickness
> measurement in the wall of the PTH. We experienced the same problem (blow
> holes) and ended up doing the same test.
>
> I would appreciate any feedback/experiences you might have.
>
> Sincerely,
>
> Mike Blackburn
>
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