Hi, I am having solder on gold trace of Hybrid circuit board. We are assemblied SMT component on a multi-layer hybrid board. I do not know where the solder come from that solder on the gold trace which is on the secondary side. We use Kapton tape on the secondary / bottom side of the board as to prevent the solder from in contact with the gold trace. But, it does not work well. Can someone help to advise me what is the most probable root causes for having such symptom. Thanks. Poh --------------------------------------------------------------------------------- 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 e-mail to [log in to unmask]: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------