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] ---------- 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] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################