Hi, Steve, The number of track repairs allowable is normally a matter between the contractor and the customer and depends to some extent on the design and its operating environment. I once had a customer who insisted on reviewing the situation if the number of track repairs, cuts or jumpers went above 3, and the board had to be re-routed if the number of track mods exceeded 5. On the other hand, I have seen customer-owned card assemblies with a veritable wiring harness of repair and mod wires, so there are no fixed rules. You have to assess the situation on its own merits, rather than relying on specs to tell you the road out. All things being equal, though, if the repairs are carried out well to a spec such as IPC-7721, and they don't interfere with, or reduce the reliable mountability of components, you should not have much of an issue. Having said that, and not knowing the extent of the track repairs being proposed, I would not like to accept new boards with long stretches of repaired track (greater that, say, half an inch) or more than about 6 repairs, but that's just my personal view. It's not always an easy call to make, but discuss it with the designers, the customer if need be, and the assembly line. Repaired tracks are weaker than original track, and this must be borne in mind for processing as well as reliability in the field. If in doubt, let the fab house repair one or two (best and worst case) and see how they fare through the production cycle. Then you can better determine what level of repair you can accept. Good luck! Peter Duncan Stephen Brown <[log in to unmask] To: [log in to unmask] RATEX.COM> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST Sent by: TechNet Aero/ST Group) <[log in to unmask]> Subject: [TN] Raw Card Track Repairs 11/21/01 04:26 PM Please respond to "TechNet E-Mail Forum." People. We get our PCB's assembled to IPC-610 class 2. We have recently been approached by our vendor regarding track repairs on our raw cards. Now I personally am not keen on allowing this, but is there a standard for raw cards similar to 610 which states an allowable quantity of track repairs, if any? Regards. Steve Brown. Commodity Specialist Xyratex. --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 --------------------------------------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------