Contact your electroless supplier to review your basket loading. Having 
panels too close together can cause performance issues due to restrictions 
of solution flow. Based on the fact that you mention you see problems when 
you have full baskets I suspect the panels are too close together.

Regards,

Bob Metcalf
Atotech Western Regional Manager

Cell 714-334-7667
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10/23/2008 06:18 PM
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Subject
[TN] Electroless  parameters






We are a high reliability PCB fab house mostly making multilayer PCB's. We 
are a high mix small volume mfr. We have observed some diffferences in the 
boards processed with different qtys. ie between lots processed in desmear 
and electroless with the baskets fully loaded and partially loaded. Our 
chemical supplier says that this should not matter much since we maintain 
the bath well within the limits and has dump schedules almost 60-70% of 
what is specified. Has anyone experienced a similar situation? Can anyone 
give your views on this whether there can be a difference in the boards 
processed with the baskets fully loaded and with boards processed with the 
baskets partially loaded.

Rgds

Pradeep


-------------------------------
Micropack Ltd, Bangalore, India

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