I'm here to tell you I've seen a board with 10 ounce copper on the outer layers. Them circuits was so high that................ Anyway, people really do use boards with heavy copper. Three ounce isn't even close to extreme. Don Vischulis -----Original Message----- From: r Tarzwell <[log in to unmask]> Sent: Apr 28, 2004 8:31 AM To: [log in to unmask] Subject: Re: [TN] Interesting Occurance... hi steve well all the guesses were blaming the board, dendrites, aligmnet, reisn starvation , but look at the chip in smoking 2 about half way up the crack on the chip you will see a black burn mark, the chip failed, not the board, as the chip cracked its usualy a sign it got real hot inside. seen it many times. if you pull the chip off i bet there is a burn mark under the chip where it got hot. well thats my guess anyway. robert Tarzwell ps they still dont get heavy copper do they i got three emails saying heavy copper is a dream and does not exist. --------------------------------------------------- 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 -----------------------------------------------------