I've had that experience due to moisture in the pcb. As it went over the wave it outgassed through vias and plated through hole ( cracking the walls). We cleared it up initially by baking the boards then addressed the problem with our bare board vendor. Jim Gleason -----Original Message----- From: annie laberge <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Wednesday, January 06, 1999 8:55 AM Subject: [TN] pinholes >Good morning everyone > >On some of our products, we have pinholes in Through holes solder joints. >We have no idea what is the root cause of these pinholes. >Could the root cause come from the PCB ? And if so, what default in the PCB >could cause this ? > >These products are 8 layers PCB, with 4 ground planes which 2 of them are >on outer layers, and 0.093" thick, and the hole diameter is 0.023". > >With these products, we had lots of problems. >Fist we had missing solder because of the lack of heat caused by the heat >disssipation of the ground planes. >We optimised our wave parameters to minimize the problem. >Then we had blow holes. The root cause was humidity in the board. We >don't have this problem anymore. > >Any help would be greatly appreciated, thanks in advance. > >A. Laberge >Quality Eng. >Matrox > >################################################################ >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 ################################################################