Since we are on this subject! Dose tombstoning occur during the liquefying(reflowing)stages of the solder paste or when is solidifying(cooling down)? -----Original Message----- From: Bev Christian [mailto:[log in to unmask]] Sent: Wednesday, May 10, 2000 2:40 PM To: [log in to unmask] Subject: Re: [TN] Tombstoning and missing parts on 0805 Resistors Alejandro, You have two problems here and they may or may not be related. Tom has given some good things to look into. Also, for the tombstone situation check the size of end caps on the chip resistors. I have seen the situation where there was a big end cap at one end and a small one at the other end, resulting in differential wetting forces pulling the caps into a tombstone position. regards, Bev Christian XLTEK -----Original Message----- From: Becerra Alejandro [mailto:[log in to unmask]] Sent: Wednesday, May 10, 2000 10:27 AM To: [log in to unmask] Subject: [TN] Tombstoning and missing parts on 0805 Resistors Hi Technetters, We are having some problems with tombstoning and missing parts on 0805 resistors. We think that the problem is related to the component, since we only detect the problem in some specific codes of the material. Could you please tell me what can I look in the components? r end cap one on end than on the other end. regards, Bev Christian XLTEK Thanks in advance Alejandro Becerra MSC Phone (915)841-8518, Fax (915)841-8401 [log in to unmask] ############################################################## 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 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 1.8c ############################################################## 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 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 1.8c ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################