At those voltages make sure the circuit design does not require a tighter tolerance range and/or leakage rate than the part is capable of achieving. If you have isolated the failure mechanism to the surface trace/pad spacing relationship and eliminated any internal ( barrel, ground/power plane, trace ) concerns, then remove the cap and clean the area and replace the cap. Take another one and remove the cap; clean the area between and around the lands and hard-wire in the cap parallel to the pads and retest. If this works than in the redesign: increase the spacing; change the flux and cleaning process; and slot the spacing between the lands. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Andre Leclair Sent: Wednesday, April 05, 2006 11:12 AM To: [log in to unmask] Subject: [TN] Arching or Current Leakage We have a customer that has a portion of a circuit which randomly fails. The circuit is a backlight driver (500volt 6mA). The output caps are 0.100 spacing of the terminals. The process used is No-clean. Can the No-clean contribute to failures of the circuit (ie promote arching or current leakage across the body of the output caps). ??? --------------------------------------------------- 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 -----------------------------------------------------