Jean, Supplying a netlist for testing would have caught this. The netlist needs to be generated prefferably from your cad. The fabricator should accept IPC-D-356, the info is in there. They can then run a check against the tooling before submitting tooling to the floor. There are a number of 3rd party programs for generating these types of files from different CAD programs. The ACT product has the capability for you to generate a netlist file. Neil Diamond At 02:03 PM 3/5/98 -0500, Jean Cortjens wrote: >Yes, it is a good idea to view your own files, but nothing guarantees an error free board. We had a board made by the same board house at least ten times. There is one custom aperture used one time on one connector on this board. They got it right everytime except the last time. Unfortunately, they made 6000 boards. The pad was wrong on the inner layers and tied power and ground together. I do all of the steps you have outlined below. When I viewed the Gerbers, it was right. How do you prevent this? >Jean > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################