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Thu, 1 Sep 2005 10:45:42 -0600 |
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This sounds more and more like a power supply problem. Are the rectifiers
periodic reverse? Do you have dual rectification to anode and cathode?
At 10:07 AM 09/01/2005, you wrote:
>Hi Milad :
>
>yes , it look loke the anode film . the amazing that not all the board have
>this chocolate copper , some times maybe just little area in the board have
>the chocolate cooper and the other areas in the board OK ,also not all the
>panels in the batch that was in the tank have a chocolate copper .
>
>Zreik Anan
>Technology Manager PCB
> P.O.B 631 Migdal Haemek 23105
>Tel : 972-46544300 Ext -267
>Mobile : 972-577675569
>
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of George Milad
>Sent: Thursday, September 01, 2005 5:01 PM
>To: [log in to unmask]
>Subject: Re: [TN] chocolate plating
>
>
>I have seen a similar surface one time. It was the result of leaving the
>parts in the acid bath without rectification. A non adherent oxide,chocolate
>brown surface would form, more like the anode film.
>
>Best regards
>
>George Milad
>[log in to unmask]
>National Accounts Manager for Technology
>Uyemura International Corporation
>Technical Center
>240 Town LIne Rd
>Southington CT 06489
>(516) 901 3874 (mobile)
>(860) 793-4011 (office)
>(860) 793-4020 (fax)
>
>
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