What kind of flux are you using ? Boards may be oxidized. Try a more aggressive flux. Brs, Johannes I have a serious problem on some of the board that stucked in the store. All of them is at least 2 years. When I wave-soldered the bare board, it has a lot of blow-holes, solder balls, pin-holes. Anyway, I try to purge all of them, but there are 6000 pieces in the Store. I try to bake at at 100 deg. C for 4 hours. Too bad, it doesn't work. I try to bake for any 4 hours just before wave-soldering. The result is terrible. Not even a slight Help !!! Can anybody give me some advises what should I do ??? Thanks in Advance Poh .. *************************************************************************** * 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] * ***************************************************************************