Hi TechNet -
     
     One additional word of warning - just baking out the moisture may not 
     solve the problem of entrapped cleaning solution. If the cleaning 
     agent has done its job correctly by putting whatever soil (i.e. flux 
     residues) into solution then baking off the water/solvent will leave 
     the soil inside the component in a more concentrated deposit! I have 
     seen this happen on "tuneable" components which we solved by either 
     covering with little boots (and yes this makes people laugh) or moving 
     the components to a postcleaning operation. Just one more reason for 
     investigating a no-clean process.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: RE: Unidentified subject!
Author:  [log in to unmask] at ccmgw1
Date:    11/20/96 2:55 PM


We have seen failures on a crystal oscillator when cleaned in our aqueous 
cleaning system.  As you mentioned, water entered through the hole and shorted 
something when powered up.  Apparently, any conductive liquid entering the 
component will cause havoc.  One possible solution would be to bake out the 
assembly prior to powering it up.  Although we opted to install this component 
and hand clean after the normal assembly process.
     
Jim Marsico
(516) 595-5879
[log in to unmask]
     
              ********************************
       *       ______   _   _  _____  *
       *      / ___  | | | | | _____  *
          *     / /___| | | | | | _____  *
       *  __/  ____  | | | | |______  * 
       * |____/    |_| |_| |________| *
       *         *
       *         SYSTEMS, INC.      *
       ********************************           
     
     
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To unsubscribe from this list at any time, send a message to:           * 
* [log in to unmask] with <subject: unsubscribe> and no text.        * 
***************************************************************************
     

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************