Interesting, If you finish a flex portion of a circuit without solder mask and then enig the result, or use enig followed by solder mask you get built in breaking issues with flex circuits, The nickel is brittle and you will get many microcracks as soon as you bend it. Don't ask me how I know........................8-) John John Burke Senior Manager - Operations , Optichron [log in to unmask] W: 510 249 5233 M: 408 515 4992 http://www.optichron.com Profile: https://www.linkedin.com/e/fps/2665502/ -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Friday, April 07, 2006 1:50 PM To: [log in to unmask] Subject: Re: [TN] Allowable repairs Hi Joel! There isn't a standard on the number of repairs that you can do, one needs to evaluate how well the assembly is fairing through all the repairs, keeping in mind what end use the assembly is being used in...but also deciding if it isn't just cheaper to build it again from scratch. I would be concerned about your case. If you're having to run jumpers to fix multiple broken traces in a flex portion of a board, then I would be REAL concerned about the traces that haven't broke...like, are they next? Next, I would be trying to find out why they are breaking in the first place. Mis-handling? Poor design application? -Steve Gregory- -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joel Alexander Sent: Friday, April 07, 2006 3:19 PM To: [log in to unmask] Subject: [TN] Allowable repairs I have a customer who is asking this question and I did know the answer. The only references I have observed was on customer prints or documentation. Can anyone help? We're searching for a standard (IPC ?) which defines the numbers of repairs allowed under different circumstances. All I have here is IPC-7721A, which details repair methods, but doesn't explain the extent of acceptable repairs. IPC-A-610 doesn't appear to address this, either. Checking an IPC catalog, I don't find a document description that fits. In particular, our test repair group is looking for guidance on how many jumper wires (to repair broken traces in the flex portion of PIC Data boards) would be considered acceptable. Are you aware of standards that define such criteria? Joel Alexander APSCO Quality Assurance Manager --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------