We had an exact similar occurrence this week on boards with the (amazingly) same date code. Cross section revealed inadequate copper plating in the vias and through holes. Jan Pelchat Benchmark Electronics Hudson Division ______________________________ Reply Separator _________________________________ Subject: Re: [TN] Weird Wave Soldering Defect... Author: "Stephen R. Gregory" <[log in to unmask]> at 0UTG0ING Date: 11/16/98 7:28 PM In a message dated 11/16/98 4:09:14 PM Pacific Standard Time, [log in to unmask] writes: << What is the plating on the board? Could it be that the boards are now two months older than when you started and you are beginning to get a shelf life problem? Is this a new batch of boards? We need some more data on the board construction, hole to lead ratio, solder mask type. Al Cash >> Hello Al, These boards are consigned, but I'm assuming it's just regular ol' tin/lead HAL, looks like it to me anyway. Datecode says 4098...just last month, two-layer board, nothing special. LPI SMOBC, axial holes (where the solder's falling out) are .035", and my Mitutoyo tells me that the leads are .025" - .027". While I send this off, I'm gonna go back to the stockroom and get me a bare board and REALLY scope that puppy out, supposedly, we just got another kit today and maybe I can see something on the fabs... I appreciate you taking your time on this...thanks! -Steve Gregory- ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################