Hello Technetters, We experienced some problems after reworking circuit boards, I would like to have inputs on the following. The problem found is capacitor leakage. The capacitor was added manually after automated production. The boards were coated with acrylic conformal coating. 1- How should a WS flux be cleaned after a rework? 2- Can WS be cleaned with alcohol? If not what would happen? 3- When reworking a SMT component, can WS flux be trapped under the component and cause leakage. The rework was cleaned with a brush or similar method. We think that the rework method was as follow (to fix a possible contamination under the component) a- SMT component is removed (possibly directly through the conformal coating) b- Using coating thinner, the area is cleaned and verified under UV to ensure no coating is present. c- WS flux is added d- Component is soldered back in place e- Area is cleaned with isopropyl alcohol f- Coating is added I think I've read that cleaning WS flux with alcohol is a NO NO! Can anyone confirm and comment? Jean-Francois --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 -----------------------------------------------------