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June 2003

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Subject:
From:
Kathy Kuhlow <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 4 Jun 2003 15:58:04 -0500
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It seems odd that with so many devices used that you all of a sudden have a problem.  With the move to a new building are the environment conditions the same?  What has the Rh been in the new building versus the old building?  Is it possible that the parts you have were exposed to humidity?  Do you have access to try and prebake a few parts and then wave/wash them?  Can you weigh a part prebake and then weigh it post bake to see the weight difference?  

Is it possible to wash a part without the inline washer and see if you get the same entrapment?  I have seen spray over spray washers actually drive moisture into devices because of the pressure.  Has the pressure been increased in anyway?  Does the part get pre-prepped prior to wave?  Is it possible that the lead prep actually cracked and exposed the internals?  

To me the topside temp sounds about right.  We typically try to target in about that same range.  Although 100 is the very high side.  

Kat

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2715.400" name=GENERATOR></HEAD> <BODY style="MARGIN-TOP: 2px; FONT: 8pt MS Sans Serif; MARGIN-LEFT: 2px"> <DIV><FONT size=1>It seems odd that with so many devices used that you all of a sudden have a problem.&nbsp; With the move to a new building are the environment conditions the same?&nbsp; What has the Rh been in the new building versus the old building?&nbsp; Is it possible that the parts you have were exposed to humidity?&nbsp;&nbsp;Do you have access to try and prebake a few parts and then wave/wash them?&nbsp; Can you weigh a part prebake and then weigh it post bake to see the weight difference?&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>Is it possible to wash a part without the inline washer and see if you get the same entrapment?&nbsp; I have seen spray over spray washers actually drive moisture into devices because of the pressure.&nbsp; Has the pressure been increased in anyway?&nbsp; Does the part get pre-prepped prior to wave?&nbsp; Is it possible that the lead prep actually cracked and exposed the internals?&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>To me the topside temp sounds about right.&nbsp; We typically try to target in about that same range.&nbsp; Although 100 is the very high side.&nbsp; </FONT></DIV> <DIV><FONT size=1></FONT>&nbsp;</DIV> <DIV><FONT size=1>Kat</FONT></DIV></BODY></HTML> --------------------------------------------------- Technet Mail List provided as a free 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/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------

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