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April 2003

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Subject:
Re: problem with gold pads of the pcb
From:
joyce <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Tue, 22 Apr 2003 08:40:44 -0400
Content-Type:
text/plain
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text/plain (52 lines) 
Look like poor plating...
                                  jk

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Prashant Chopra
>Sent: Tuesday, April 22, 2003 2:59 AM
>To: [log in to unmask]
>Subject: [TN] problem with gold pads of the pcb
>
>
>hi all,
>
>we are using gold finger pads on the pcb. but after going thru
>smt process of screen printing,component insertion, reflow and
>aqueous wash we are facing the problem of grey color dots on the pads.
>
>This problem is with the pads where no components are being placed.
>
>There is no solder paste printing on these pads nor any
>components are place there and they are being covered with
>Kapton tape thru out the above process.
>
>
>Can anyone point to some reasons for this problem?????
>
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