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June 2000

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Subject:
From:
Phil Crepeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 1 Jun 2000 17:00:42 -0700
Content-Type:
text/plain
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text/plain (162 lines)
hi,

i'm not sure what the mood of this response is, but first articles do a lot more that just check the quality of the bare board.  they also give you confidence in:

parts placement, stencils, dispensing, reflow profiles, tooling, testing, solderability, ad nauseum.

phil

-----Original Message-----
From: Howieson, Rick [mailto:[log in to unmask]]
Sent: Thursday, June 01, 2000 4:24 PM
To: [log in to unmask]
Subject: Re: [TN] PCB Inspection


Now there's a lack of trust in your board house.
Rick

>-----Original Message-----
>From:  Paul Klasek [SMTP:[log in to unmask]]
>Sent:  Thursday, June 01, 2000 5:04 PM
>To:    [log in to unmask]
>Subject:       Re: [TN] PCB Inspection
>
>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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