Dear Prasad: Good question. Wish everyone was as diligent to line up the IPC standards. J-STD-001 is the IPC Standard for soldering process for electronic assemblies. As such it provides the user with only sufficient information to ensure that their soldering materials & process are controllable & repeatable (and for class 3 documented). (Try to find a temperature setting for a soldering iron used to make a solder joint. You won't find any. (Appendix B contains the only reference to temperatures but as an appendix statement it is only enforceable if the contract states the appendix is required under the contract.) The IPC-7711/7721 is a GUIDELINE not a Standard. Therefore as a guideline its individual procedures are to be approved by the user and communicated to the manufacturer. That is why you have several different procedures (or methods) for the same rework/repair operation. I would suggest it would be up to the user engineering staff to determine whether a particular Rework/Repair Procedure would meet a products form, fit and function requirements in the product's end use. However the IPC-7711A/7721A guidelines are based for non-destructive procedures. So in general any of the procedures should generally be safe to use. But the old "it depends" comes into play as always. Hope this clarifies the relationship between the two. Gregg A. Owens, MIT Executive Director Manufacturing Technology Training Center, Inc. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of prasad godavarti Sent: Thursday, April 06, 2006 7:38 AM To: [log in to unmask] Subject: [TN] relationship between J-STD-001 and IPC 7711/7721: need your help. In a nutshell here is where i need some help: we call out and enforce J-STD-001, Class 3 on our assembly drawings. Very often we do repair/rework on these assemblies and we do not seem to have a clear link between IPC 7711 and IPC 7721 wherein the how-to's and what to control are listed and J-STD-001, Class3. The only words that address repair/rework in J-STD-001 have to do with the acceptance criteria for such operations. Ques: 1. I am reading this correctly? 2. How do i ensure that the repair and rework procedures and the skill sets are adequate? do I need to explicitly state in on the drawing the need for repair and rework per IPC 771 and IPC 7721? 3. If i do not state that then is the compliance to J-std-001 violated? Thanks Prasad Godavarti __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 1.8e 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 -----------------------------------------------------