I had implemented this on my innerlayer line several years ago. We ran several tests using faults after t/u vs. faults on no t/u. In all cases our yields were much better after no t/u. I don't have any hard data to show you as I was with a different co. We did spend a significant amount of time on the preclean, image side of the process. An ounce of prevention yada, yada, yada..... Hope this helps, Mike ______________________________ Reply Separator _________________________________ Subject: [TN] Zero TU Author: "Howieson; Rick" <[log in to unmask]> at smtplink-hadco Date: 2/16/00 11:12 AM This is for the board fab gurus. Has anyone out there implemented a Zero Touch-Up program and if so, how did you go about doing this, i.e. was it based on yield data? or drop of the hat? All responses much appreciated. Rick Howieson http://www.gt-corp.com ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################