XPost: sci.electronics.basics, sci.electronics.design, sci.electronics.misc   
   XPost: sci.electronics.repair   
   From: diverse@tcp.co.uk   
      
   On 05/03/2016 17:14, DaveC wrote:   
   > Cleaning up an old rotary mode switch used for 5v logic levels. It has some   
   > kind of grease in it.   
   >   
   >   
   > …which has always confused me: grease is an insulator (well, the grease in   
   > this switch is—just tested and it’s infinite ohms).   
   >   
   > I read that dielectric grease is good to keep contacts sealed against the   
   > elements that have high physical pressure (which overcomes any separation   
   > provided by the grease) but that signal and other low voltages grease is   
   > contra-indicated.   
   >   
   > What say y’all?   
   >   
   > Thanks.   
   >   
      
   Over the years all those problematic radio multiway wavechange and tape   
   recorder play/record slide switches. I never saw grease inside them and   
   the failure was due to black corrossion product copper suplphide? which   
   is an insulator that a phosphor bronze contact could not wipe/break   
   through to make contact. The worst black was at the more open ends to   
   the air, rather than the core of the switch body.   
      
   --- SoupGate-Win32 v1.05   
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