From: Tony.Miklos@gmail.com   
      
   On 4/20/2012 4:46 AM, Alan Hood wrote:   
   > kreed;691817 Wrote:   
   >> On Apr 20, 2:50*am, denny405 denny405.aae7...@collectingbanter.com   
   >> wrote:-   
   >> A few days ago the #0 on my selector keypad stopped working. *Using   
   >> all   
   >> my expertise, I fiddled with the wires and it started working. *Today   
   >> the entire bottom row quit (6 thru 0). *Any ideas would be graciously   
   >> appreciated.   
   >>   
   >> Thanks   
   >>   
   >> --   
   >> denny405-   
   >>   
   >>   
   >>   
   >> several things,   
   >>   
   >> 1 -  dry joints on the headers on the button bank,   CCC and the   
   >> "pricing board".   
   >> Remove boards and resolder the rear (pin) side of the connectors.   
   >>   
   >> 2 - new pins in the headers. Some of the pins rowe used liked to fail,   
   >> or lose their tension.   
   >>   
   >> 3 - dry joints on the column/row driver IC's or transistors (cant   
   >> remember actual circuit).   
   >>   
   >> 4 - selection buttons.  They can and do die, and often just go open   
   >> circuit, but can be   
   >> \pressed if you push hard or multiple times.  Next time it fails,   
   >> short the terminals on the back   
   >> \and see if this helps.   
   >   
   > Hi,   
   >   
   > All that Kreed says is correct, but stick to soldering the dry joints   
   > (called cold joints USA)   
      
   Although "cold joints" is normally the wrong term also.  A cold joint   
   was bad to begin with, both surfaces were never wetted or the joint was   
   moved while the solder was freezing (yes freezing) back at the factory.   
     Most of the time it is actually a matter of cracked solder joints due   
   to heating/cooling cycles and/or mechanical stress on the joint.   
   Just a bit of semi useless information.   
      
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