Dear Franco,

The first incident seems that the anode bags are broken and now
repaired/replaced.

But now the problem come back again.  Check if you found these stains on
copper surface, immediate after direct plate, or after the plating process
this time.  If it is found from the direct plate, check all steps again,
especially the frequence to replace filter cartridges of each steps.  Also,
check and locate where and why the stains come from and try to discourage
its formation.  The stains may due to inadequate rinsing as well.

Good luck.

_______________________________________________________________

At 07:42 AM 1999/4/30 +0200, franco vezzoli wrote:
>Ciao a tutti !
> Does anyone have had problems with stain on copper after a Palladium
>DPS line?
>
>We have this problem : Boards treated with a direct metallisation line
>palladium based (Similar to lea ronal conductron) present a light stain
>on the copper surface. We do not scrubb or brush panels before dry film
>lamination. In the electrolitic line the stained area of copper wil be
>burned. We had this problem some month ago and the problem complete
>desappeared just by cleaning chemical line's baskets. Now It's comming
>back eaven with cleaned baskets.
>Does someone has any idea what is causing the stain?
>
>Thank you,
>
>Franco
>
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