>From the EMPF HelpLine; prepared by Tim Crawford James, I have never heard of this problem before and I seriously doubt that the air knives are the problem. Even if (and I do mean IF) the air was generating static it should not discharge if all handling procedures are correct. It should be a simple check though. Test the boards for ESD damage before cleaning, then again after clean and see what happens. >---------- >>From: [log in to unmask] >>Date: Thu, 03 Apr 97 08:01:05 PST >>To: [log in to unmask] >>Subject: ESD damage to gas fet during the cleaning process >> >>Has anyone experienced damage to component on circuit boards that have >>gone through a water cleaning system. We have a number of fets on a >>board that have been damaged at our board supplier during assembly. >>The fets during testing have shown damage with as little as 20 volts. >>The Electrical Engineering guys in our company think the damage might >>be caused at the exit end of the water cleaning system by the air >>knife that is drying the board. They have asked our assembly house to >>investigate the addition of an air ionizer inline with the air knife, >>to eliminate the possibility of creating a static charge during this >>process. The cost to do this is $20K, I could use a little help if >>its out there to convince them this is not required. My contention >>is the assembly house which never handled this sensetive of a >>component before has a handling problem which they have addressed and >>corrected. but the EE guys here still want them to address the >>airknife situation on the cleaning system ***ALL NEW EMPF PHONE NUMBERS*** Jack Crawford, HelpLine Coordinator Electronics Mfg. Productivity Facility ****NEW--317.655.3688 ****FAX 317-655-3699 714 N Senate Ave, Suite 100 Indianapolis IN 46202-3112 VISIT OUR HOME PAGE AT: http://www.empf.org [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************