Trevor, Check out the URL below. The problem in this case study is too rapid a cure, or a partial cure of the SMA. http://www.residues.com/pdf/Cases30.PDF Steve Mikell Solectron Charlotte -----Original Message----- From: Trevor Goddard [mailto:[log in to unmask]] Sent: Wednesday, November 01, 2000 12:08 PM To: [log in to unmask] Subject: [TN] solder under chip components Has anyone ever seen solder shorts under an smt resistor that has been glued on a board and then wave soldered? The boards go through the standard surface mount process of screen printing the glue, placement of components and curing the glue. Then the boards receive solder reflow for the top side of the board, on to hand assembly and then wave solder. During all in process inspection even after wave solder, the boards look good. When the boards get to test it is a different story. Randomly across the bottom side of the board, the side that was wave soldered, we will get short conditions on various caps and resistors. If you look at the component nothing appears to be wrong, but when the component is removed you can see solder on the under side of the component and on the pcb. This problem has just cropped up, so I find it a complete mystery. Thanks in advance. Trevor Goddard, SMT Supervisor XLTEK (905) 829-5300 x 348 [log in to unmask] <mailto:[log in to unmask]> ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------