Hi, In my past I seen similar results caused by lack of current to specific
boards, or areas caused by oxidized buss bars or improper connectivity on
the board them selves. Sometime just cleaning your buss bars on a daily
basis will prevent the majority of your problems. Check with a simple
continuity meter circuits on boards to see if there are any opens. Best of
Luck Jim Jablonsky   

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Anan
Sent: Thursday, September 01, 2005 12:10 PM
To: [log in to unmask]
Subject: Re: [TN] chocolate plating

Hi :

 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 .

the hull-cells is OK .

the anode film look OK



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 Dennis Fritz
Sent: Thursday, September 01, 2005 5:10 PM
To: [log in to unmask]
Subject: Re: [TN] chocolate plating


Good suggestion from George Milad.  Copper plates well to  copper, but not
well to copper oxide.  Is this chocolate all over the  boards, or in
patches?

You may want to check for impurities now in the bath.   Organics usually
show
on hull cells - have you run that on the  bath?

Inorganic contaminants cause the following problems (From IPC  740 trouble
shooting guide, chapter 10)



What does the anode film look like - may be a way a clue to  what is
happening on the boards?

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