We're having problems with "solder balls" that are "resting in a nest". We have .025" via holes that are covered with L.P.I. soldermask. The mask is collapsing when going through our vertical hot air leveler and little "solder balls" are sitting just inside the holes. The solder balls are falling out at subsequent operations and in some cases are ending up between contact fingers that have .006" spacing between. The solder balls are creating a short at electrical test. They are easily removed but not easily detected before hand. Any ideas on what we can do to eliminate this problem? *************************************************************************** * 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] * ***************************************************************************