you'll probably get a lot of different answers 150 deg F is not very hot, and this will probably help but still there will be stresses ...
since this bd is doing 'a very important job' you may want to tread lightly what is the measure of 'badly warped' ? how big is the board and what is the shape? ie long and narrow or what how many layers ? balanced construction internally? parts on both sides ? what is the cause of the warping? it could be in the design, bare bd fab, or assy method or some combination of all was the board wave soldered at some step? if not preheated properly and that can be one cause keep us posted or put up a link to a pic if you can Dennis Saputelli Robison Michael R CNIN wrote: > > This email is not a Protel-specific question but instead concerns a > generic problem with some boards I'm getting, so I apologize for being > off-topic, but this forum has more PCB experience than any other I > know of, so I would like to get your advice. > > A partner in a manufacturing effort is sending us full populated > boards (ICs and passive components) that are badly warped. We sent > them back and rather than get the boards remade and repopulate them, > they want to heat the boards up (fully populated) for three days at > 150 degrees Fahrenheit in order to straighten them out. These boards > perform an extremely important job and I'm worried about the stress > on both the electrical components and the boards themselves. Should > I allow them to do this or should I demand the boards be remade? > > Thank you, Michael Robison > -- _______________________________________________________________________ Integrated Controls, Inc. Tel: 415-647-0480 EXT 107 2851 21st Street Fax: 415-647-3003 San Francisco, CA 94110 www.integratedcontrolsinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
