Yes Patty,

Repair of innerlayer traces is very common. Most use a Hughes welder that welds a gold ribbon "Kovar"  over the open. The ribbon is welded to the remaining trace at each end of the break. When done properly I have found internal weld to withstand the lamination cycle. Some may even apply a thin coating of epoxy over the weld to minimize the risk of handling damage.  If you need more specific info please contact me off line . I can be reached at [log in to unmask]


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From:   Causey, Patty - LYPME
Sent:   Thursday, October 29, 1998 6:47 AM
To:     [log in to unmask]
Subject:        [TN] fab: repair inner layer trace

After an inner layer has come out of the etcher and you find a trace
that is broken, is there anyway that you can repair a copper trace (easy
access to it, i.e., not close to any other traces) that will withstand
the subsequent lamination cycle?

Thanks,

Patty G. Causey / LYPME
Manufacturing Engineering Support
(912) 926-9473 DSN: 468-9473 Fax: (912) 926-7974
email:  [log in to unmask]

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