I suppose anything can be negotiated. We sometimes have customers that
waive electrical test on very simple boards. They usually don't want to pay
(or wait) for a test fixture to be built. You can in theory use a flying
probe tester to avoid fixture costs and lead times, but these testers are
relatively slow and increase the amount of time at test.
I can imagine that in the case of a relatively simple prototype where speed
was of the essence, one might forego a fixture and flying probe test a
single board. This would save time and money. But I consider this very
unusual and certainly not something you want to do on an ongoing basis. The
time and money savings are only good until the first inevitable failure
occurs and unfortunately, you are now seeing the results and no longer
saving neither time nor money.
Mike McMaster
RF Product Engineer
Merix Corporation
503-992-4263
> ----------
> From: Charles Caswell[SMTP:[log in to unmask]]
> Reply To: TechNet E-Mail Forum.;Charles Caswell
> Sent: Monday, May 19, 2003 2:24 PM
> To: [log in to unmask]
> Subject: Re: [TN] PCB_OPEN_VIAS_PROBLEMS
>
> I agree and so does the project engineer, he was very unhappy to hear
> this. This is what we were told by the former QE on the job. I am still
> waiting for more info from quality. Of course they may not choose to tell
> us production types.
> Charles
>
> -----Original Message-----
> From: Fineline Circuits, Inc. [mailto:[log in to unmask]]
> Sent: Monday, May 19, 2003 7:11 PM
> To: TechNet E-Mail Forum.; Charles Caswell
> Subject: Re: [TN] PCB_OPEN_VIAS_PROBLEMS
>
>
> Charles:
> If electrical testing is required and paid for, all the boards should
> have
> been netlist tested or they could have netlist tested the golden board and
> used this golden board to test the remaining batch on a bed of nails
> tester.
> But in either case all the boards should have been tested and one with any
> opens either fixed and retested or crossed out.
>
> Sona
> Fineline Circuits Inc.
>
> ----- Original Message -----
> From: "Charles Caswell" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, May 19, 2003 1:23 PM
> Subject: Re: [TN] PCB_OPEN_VIAS_PROBLEMS
>
>
> In our case I have been told that the netlist testing is only done on one
> out of the lot.
> Charles
>
> -----Original Message-----
> From: Fineline Circuits, Inc. [mailto:[log in to unmask]]
> Sent: Monday, May 19, 2003 4:26 PM
> To: [log in to unmask]
> Subject: Re: [TN] PCB_OPEN_VIAS_PROBLEMS
>
>
> Wesley:
> Weren't these boards tested by your board supplier? Electrical testing
> should have failed the boards with the open vias . The vias may have voids
> due to bad drilling and deburring which may clog the hole, poor smear
> removal or malfunction of the electroless copper line-trapped air or could
> be plating voids. Cross section of the open vias should pinpoint the
> problem.
>
> Sona
> Fineline Circuits Inc.
>
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