You need more Z axis wave energy by the sound of it, I have had this problem in the past (first occurrence 17 years ago) where the solder mask is higher than the pads and the solder does not touch down on the copper as the system is at that point airtight if there is no via hole in the test pad. Increasing wave agitation will fix this or you could consider making the test points bigge or putting via holes in them which is generally not an option. John Burke (408) 515 4992 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Amarjot Singh Sent: Thursday, January 21, 2010 11:59 AM To: [log in to unmask] Subject: Re: [TN] Skipping pads in wave solder Hi Gang: My customer is having a problem in wave soldering. The board has surface mount and through hole components on top side and there are some test points on the bottom side. While passing through wave solder, the holes are filling nicely but solder is not being coated on some of the test points. Some test points are in the ground plane (solder mask defined) and the others is isolated but sorrounded by ground plane. I can cover those pads using solder iron without any problems. When performing the similar process at some other assembly house in wave solder, I noticed the same problem. I played with higher pre-heat temperatures, slower and faster speed but same result. Any thought on this issue? Thanks, Amarjot --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------