I have seen this with vme connectors. It was due to connector not allowing the board to expand at the same rate as the material around it. We ended up using a stiffener that held the board and the PCB and did not hard attach the connector to the board ( i.e did not screw it down till after it was soldered. jg -----Original Message----- From: [log in to unmask] <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Friday, December 11, 1998 10:29 PM Subject: [TN] Warped boards at PCI connector? >To technet >I have this board that is 18 by 14 though hole and SMT. After reflow the board >looks good not warped. Once assembled and sent to wave the board warps, only >around the PCI connectors. It warps so bad I don't have any lead protrusion. I >have tried to run this board many ways fast slow and minimal preheat. I still >have this problem. Has anyone ran into this problem before? Is this common >around PCI connectors? I recall this happening once before many years ago, I >resolved it by tacking down the edge and middle of the connectors then >masking. Is this the only fix? Any other suggestions > >Thanks in advance >Angie > >################################################################ >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 ################################################################