The ICT test techs that I asked this question to stated that generally the IAg finish provides superior contact conductance over both solder and especially OSP, which I think we all take for granted. However, they cannot say for sure if the same is true of a tarnished silver surface, stating they have never had to deal with that problem, at least not that they were aware of. Anyone else have this problem? -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke Sent: Wednesday, July 19, 2006 11:26 AM To: [log in to unmask] Subject: Re: [TN] Immersion Silver for ICT Me too, I know that silver oxide is conductive, but I do not think that the sulphides are. I have always printed them with solder to avoid cosmetic problems downstream, and also as a wear surface where card guides are a factor and the contact is used as an EMI earthing point, although in this latter instance it is wise to break up the earthing card guide edge ground into a dot pattern and cover the rest with solder resist. John -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Darrel Therriault Sent: Wednesday, July 19, 2006 8:57 AM To: [log in to unmask] Subject: Re: [TN] Immersion Silver for ICT Leo, I always included test pads in my solder stencil so they would be soldered. DJT Lin Leo <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 07/19/2006 12:04 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Lin Leo <[log in to unmask]> To [log in to unmask] cc Subject [TN] Immersion Silver for ICT Hi, Recently, I met a customer complaint for Immersion Ag boards. Immersion Ag boards in assembly side weren't applied solder on ICT(in circuit test) pads. After assembly, Ag surface discoloration problem and ICT failure defect were found in those pads. Those pad were still solderable. ICT was OK after soldering. Does anyone have similar experience? How can I solve this problem? Does it need to suggest pre-solder before ICT? It's chronic or excursion issue for immersion Ag surface finish? Best regards Leo ___________________________________________________ ??? Yahoo!?????? 7.0??????????? --------------------------------------------------- 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 ----------------------------------------------------- http://messenger.yahoo.com.tw/ --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------