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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 25 Aug 2003 16:20:42 +0300 |
Content-Type: | text/plain |
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Hello Steve,
As I stated, the AOI can inspect only pads that have different color (dark
color) oxide pads / Skipped Gold plated pads. Oxide Nickel pads or too
much Phosphor that caused "black pads" under Gold pads finish and the Gold
finish is not effected / visible by human eye, the AOI can not find this
kind of failure.
Sorry for the miss understanding.
Best Regards
Reuven
Steve Gregory
<[log in to unmask] To: [log in to unmask]
OM> cc:
Sent by: TechNet Subject: Re: [TN] Black Pad Detecting Machine
<[log in to unmask]
>
24/08/2003 16:59
Please respond
to "TechNet
E-Mail Forum.";
Please respond
to SteveZeva
I may be understating the obvious, but I've always thought the the reason
black pad was such a insidious problem, was because you couldn't detect it
until you tried to solder to it. Black pad is a problem with the nickel
plating beneath the gold, correct? I've never known a AOI machine to be
able to look through gold...
-Steve Gregory-
Could you send me a picture of a black pad on an as received circuit?
I am sure that Werner will be very happy to see it too.
Thank you,
Gaby
----- Original Message -----
From: "Reuven ROKAH" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, August 24, 2003 9:29 AM
Subject: Re: [TN] Black Pad Detecting Machine
> Hi Werner,
>
> The AOI can be color sensitive inspection machine and not only geometric
> inspection.
>
> Searching black pads(if it visible by human eye) is a matter of
> programming of the AOI.
>
>
> Best Regards
>
> ROKAH Reuvencom
>
>
>
> Werner
> Engelmaier To: [log in to unmask]
> <[log in to unmask] cc:
> COM> Subject: Re: [TN] Black
Pad
Detecting Machine
> Sent by: TechNet
> <[log in to unmask]
> >
>
>
> 22/08/2003 14:48
> Please respond
> to "TechNet
> E-Mail Forum.";
> Please respond
> to Engelmaier
>
>
>
>
>
> Hi Reuven,
> You say: "The PCBs shops can inspect black pads using AOI (Orbotech,
> Camtec)"
> How is this done? What do they see?
>
> Werner Engelmaier
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