In a message dated 02/24/2000 12:26:51 PM Central Standard Time, [log in to unmask] writes: << I have this Resonator part that is very large and sets on the top of the PCB and goes through our convection reflow oven at 220 C. Board is very complex and the problem we are having is that only the edges are being soldered and when we cross-section to inspect solder under part it is still uncured. We discovered this problem when parts started falling off PCB. Any and all comments welcomed. What we would like to know is if any one else is using this part and have they solved this problem.. Steve >> Hi Steve! Can you tell us a little more about this part? I mean how large is very large? Is it a ceramic part? Also when you say the board is going through the oven at 220º C., where exactly is that temperature measured on the board? What kind of solder alloy are you using...a 63/37? If so, then if the resonator location is seeing 220º C., there should be no problem. Sounds to me like a good temperature profile plot needs to be done with a thermocouple placed at the resonator terminals...seems to me that there's not enough calories to reflow the solder... -Steve Gregory- ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################