Hi Louis,

We have seen this issue with PCBs where the final finish is either not 
thick enough or hasn't covered evenly. Subsequent processes will attack 
the copper where the finish isn't protecting it, resulting in voids and 
mousebites.

- Paul

On 3/08/14 3:41 AM, grandrien wrote:
> Hi Louis,
>
> If it is on limited location on the PCB or even on the same limited location on PCBs of the lot, it may be an under vacuum preemption tool scratching or polluting the PCB surface at the PCB workshop.
>
> If it is spread over all pcb surface it could be an insufficient cleaning step leaving some residues interfering afterward with final plating.
>
> Rgds
> Grandrien
> ========================================
> Message du 08/03/14 02:44
> De : "Louis Hart"
> A : [log in to unmask]
> Copie à :
> Objet : [TN] circuit board pits and voids
>
> http://ipc-technet.groupsite.com/galleries/show/26943
>
> Technetters, after my plea for help a few minutes ago, I immediately found how to post pictures. There are four under the link above, showing what appears to be missing copper plating on the surface of circuit boards.
>
> Anyone have a suggestion on what might be causing this phenomenon? Louis Hart
>
> PS - Please ignore my earlier request for help in posting the pictures.
>
> Many thanks....
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
>
> ___________________________________________________________
> Mode, hifi, maison,… J'achète malin. Je compare les prix avec Voila.fr http://shopping.voila.fr/
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>



______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________