Check on the conveyor rollers in the equipment. They can and do get chewed
up and start to disintegrate leaving marks on the boards.

Russ Burdick
Process Engineer
Prototron Circuits Southwest
Tucson, Arizona
520-745-8515

>From: Shirley Xiao <[log in to unmask]>
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,   Shirley Xiao
><[log in to unmask]>
>To: [log in to unmask]
>Subject: [TN] Tiny black spots on copper foil surface
>Date: Wed, 20 Mar 2002 23:13:41 -0800
>
>Dear All:
>We encountered a problem after develop, etch & strip.
>Lots of tiny black spots were found on copper surface.
>We are sure that these tiny black spots are not
>oxidization.They can not be removed by acetone but is
>removable by micro etch.Before get result by EDX
>element analysis, I wish anyone have similar
>experience can share some information with me.
>
>
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