Karen, Thanks for sharing. Victor, -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Karen Tellefsen Sent: Wednesday, January 27, 2010 11:15 AM To: [log in to unmask] Subject: Re: [TN] Solder Ball Under Chip Cap Try a home plate or reverse home plate stencil aperture. http://www.alphametals.com/leadfree/pdfs/Optimizing%20Stencil%20Desing%20for%20Lead-Free%20Processing%20(SMTA%202004).pdf Karen Tellefsen - Electrical Testing [log in to unmask] 908-791-3069 We recently received a call from one of our customers that their boards are failing Hi-Pot test. They sent us a picture of a solder ball under one of the chip caps (package 1825). Apparently it's present on all 50 boards we built and always in the same place. We are using leaded paste for this build and the stencil we received was from the previous manufacture who could not fix the problem and went to hand soldering the part (info we got after the fact). I have inspected the stencil and it looks fine. The apertures are a 1:1, so the only thing I can think of is getting a reduction of some kind on the stencil. I will send the picture to Steve to get it posted. Thanks, Rob Strecker --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 15.0 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 -----------------------------------------------------