Also, AirVac and SRT type repair stations use thermocouples because they are profile controlled systems. And if you are not going to do FMA they you can usually get a way with baking at 125C for 8 hours. FYI we use kapton tape around adjacent components then to remove the tape we require deionizing fans. Even the ESD kapton tape generates too much of a charge during removal. Hey Bev, I hope you are doing well. It depends on the repair method and whether you want to save the components for FMA analysis. If you are going to using a repair system (e.g. AirVac SRT, etc..) that concentrate the heat into the PWB (FR4 in our case) then yes, you need to bake or you could get delamination, blistering, or noticeable physical change in the PWB/soldermask. Also, if you want to do FMA on the components, and you can't or don't want to cut the leads off, you have to treat it like the MSD that it is and bake appropriately. If it is a small device that you can remove with hand tools (Metcal or Hakko type) then you are not going to get the PWB hot and therefore you do not need to bake. I don't recommend using these tools if you want to do FMA. Call me on my cell if you want to talk directly. I am south of the border in Guadalajara for the next few weeks. Take care, Russell Nowland Alcatel-Lucent Supply Base Engineer Address: 14000 Quail Spring Parkway, Suite 300 Oklahoma City, OK 73134 email: [log in to unmask] Desk: 405-302-1660 Cell: 405-203-0034 Fax: 405-302-1622 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian Sent: Thursday, January 18, 2007 7:23 AM To: [log in to unmask] Subject: [TN] Rework of circuit packs with MSL Parts Technetters, We have required that circuit packs that are going to be reworked to be dried before rework. My questions to all of you are: 1) Do you require this for all your boards irrespective of what is on them? 2) Do you dry it to the requirements of the most sensitive MSL component? 3) Do you use thermocouples to see how hot the MSL components are going to get from radiated, convected and transmitted heat? 40 If the latter, what is the maximum temperature you allow the nearest MSL component to reach before you require a pre-dry? Thanks in advance. Bev RIM --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful. --------------------------------------------------- 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 -----------------------------------------------------