Russ, I would lean towards moisture/poor rinsing of innerlayers. What is your trace edge to drilled hole spacing-sounds like it must be pretty tight?. ----- Original Message ----- From: "Russell Burdick" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, March 22, 2004 4:38 PM Subject: [TN] high resistance shorts > Here's a question for all you electrical fans...( ha, ha, ha, not those type > of shorts) > > We are getting high resistance shorting on multilayer polyimide only boards. > Inner layers test out with no problem. Immediately after outer layer etch > there are the shorts. Omega meter testing shows no ionic contamination at > this stage. Baking prior to ET reduces the number of shorts, although after > a few days the shorts are back. Construction of board is foil copper at > lamination, not cap-core. > > As usual, any and all help is greatly appreciated. > > Russ > > _________________________________________________________________ > Free up your inbox with MSN Hotmail Extra Storage. Multiple plans available. > http://click.atdmt.com/AVE/go/onm00200362ave/direct/01/ > > --------------------------------------------------- > 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 847-509-9700 ext.5315 > ----------------------------------------------------- --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------