I agree it look like a open to me as well. Since it is at a angle it will be very difficult to place a weld there. As far as the finish copper half oz foil should have been used unless a waiver from the customer was provided to use 1 oz. I would also ask for a cross section of the board as well. How did the open pass electrical test? Just my thoughts. Highest Regards, William W. DeCray III PHONE:(434) 237-6391 ext 115 CELL: (434) 851-6115 FAX: (434) 237-1324 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Steve Gregory Sent: Wednesday, May 28, 2003 1:53 PM To: [log in to unmask] Subject: [TN] Trace thickness problem... Hi all! I'd like your opinion on something. We're building a prototype assembly for a customer, and discovered something at final inspection that we didn't see when we received the bare fabs. We ordered 16-boards in four, 4-up panels. We found a trace that has a spot where it looks like it didn't plate up during final plating. Take a look at "Trace Thickness" at http://www.stevezeva.homestead.com There's 4-boards we've found that have this problem, 1 on one panel, and 3 on another panel, and of course they're all built up. The 6012 says that thickness can't be reduced by more than 20% of the minimum conductor thickness. I can't really tell if it's 20% or 50%. I've sent pictures both to our customer and the fab vendor. The customer wants the spot repaired, and there are a number of ways to do that. The fab vendor says it's not a problem because the stack-up drawing calls out 1-oz. copper after plating on the surface layer, and they said that there's more like 2-oz. on the surface layer, so there shouldn't be any problem, at least that's what I was told, I didn't speak to anyone directly. The stack-up is on my page too, look at "Stack-up"... The first question that comes to my mind, if 1-oz after plating was called on the stack-up, why was 2-oz plated? Or is that normal?. The drawing references our customers internal spec for fabrication, but it uses MIL-PRF-55110 for references. What are your opinions about this? Thanks everyone! -Steve Gregory- --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------