Hello Larry:

Might not peelable solder-mask serve the purpose?

Charlie

 -----Original Message-----
From:   TechNet [mailto:[log in to unmask]]  On Behalf Of Larry Koens
Sent:   Friday, August 24, 2001 2:18 PM
To:     [log in to unmask]
Subject:        [TN] Fiducials

Many of our projects are multiple up boards in a panel. There are times
when we only populate a partial panel and save the remaining boards for
later runs. We use the local fiducials to show the pick and place
machines which boards to populate. My question is, anyone have any ideas
on what to use to hide the fiducials on the boards you don't want
populated? On X'd out boards, we use a black marker, but that doesn't
work on these as we need to use the fiducials at a later date. I thought
about using a black label from the local office supply store, but I
really want something that doesn't burn up in the reflow or leave a
sticky residue.  Any suggestions?

Thanks
Larry Koens
E.I. Microcircuits
1651 Pohl Road
Mankato, MN

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