We agree with Phil that you can detect internal traces using transmission x-ray. However, if the open is at the connection of an internal trace to a PTH then there is a good probability that you won't see it with x-ray and will need to do cross sectioning. Regards, George George M. Wenger (908)-546-4531 Reliability Engineer RF Power Amplifier Group Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 [log in to unmask] -----Original Message----- From: Crepeau, Phil [mailto:[log in to unmask]] Sent: Wednesday, November 12, 2003 10:33 AM To: [log in to unmask] Subject: Re: [TN] Inner layer open trace hi, there are x-ray machines and then there are x-ray machines. if you haven't tried a machine of the order of a 'feinfocus' machine, you may want to do that. phil -----Original Message----- From: Keith Calhoun [mailto:[log in to unmask]] Sent: Wednesday, November 12, 2003 7:16 AM To: [log in to unmask] Subject: [TN] Inner layer open trace hoping that Technet could once again help me with a vexing problem. We have had a number of boards which have been returned from the field that fail during our testing. We have identified the problem as an open trace on an inner layer between one or more IC's and the card edge connector. All of these opens appear to be found on the same inner layer, and all the boards which show this failure have the same date code on the bare boards. We have tried to have these boards x-rayed to determine if we could find any problems, but we were unable to locate any problems. We can identify the area on the boards as being somewhere in about a 2-3 sq. in. area. I am interested in finding out about any other methods, sources, etc which we can use prior to destructive investigation of this problem. Again your help is greatly appreciated. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- ------------------------------------------------------------------------------------------------ This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any unauthorized use of this email is prohibited. ------------------------------------------------------------------------------------------------ [mf2] --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------