Still a bit vague on the part number question, by your answer do you mean: 1.) Same part number at different part locations. 2.) Completely different parts and unrelated parts ( by this I would even wonder if the different parts were from the same manufacture. Are you gluing any of the parts that are breaking in place? Do these specific parts have a via underneath them and specifically a "tented" via? Have you tried simply placing a few of the parts on a cookie sheet or piece of FR4 and "cooking" them to see if possibly they have some moisture trapped inside them (or is this just a dumb idea)? JaMi Smith ----- Original Message ----- From: "Virgil Lenton" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, January 16, 2003 10:43 AM Subject: Re: [TN] Cracking SOT-23 > I apologize for the vagueness in my original posting. > This is what we know so far about this problem. > > - It does not appear to be Z-height related - nozzles are spring loaded and > we have double checked. > - Breaks are complete breaks through the center of the body. Sometimes > the 'lid' comes off, but most often they crack top to bottom right through. > - We have *not* explored the possibility of moisture, but at this pont we > feel moisture is unlikely. > - The components in question are all placed on pass 1. We havent yet > checked to see if they are cracked before pass 2. > - It is not always the same part, but always SOT-23. > - The profile used is our 'standard' profile that has been used for about 3 > years. > > Regards > Virgil > > --------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > 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/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 1.8e 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------