hi :

The rectifiers are DC , and we have for eatch sife of the anode separate
rectifier

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 Steve Hodge
Sent: Thursday, September 01, 2005 6:46 PM
To: [log in to unmask]
Subject: Re: [TN] <List>Re: [TN] chocolate plating


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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