[Elecraft] K2 Reading AGC Voltage and U2 Failure

W7is at aol.com W7is at aol.com
Sun Aug 6 19:38:35 EDT 2006


I was getting ready to verify the AGC voltage on a one year  old working 
K2 when my probe slipped while trying to read the voltage on pin 5 of  U2.   
  The K2 locked up sending continuous dots and no buttons  function
 on the front panel. 
The dispaly locked up on the last frequency it was reading and the tuning  
dial
has no effect on it.   
 
Maybe I shouldnt have done this but I decided to try a master reset just  in
case.   Which didnt solve the problem ---   but the k2  did reset.  But its 
still
hung up but this time with a dash all the time rather than continous  dots.   
 
According to the voltage readings on U2 of the control panel, 
 pin 3 has only .27 volts on it.     
While pin 6 and 7 both read 3.8V.    So it would appear that  the probe 
slipping
has caused U2 to fail?    I can adjust the  agc threshold voltage for the 
proper
3.8V on pin 5.    
 
 I dont have a spare LM833 on hand to be able to confirm thats  what 
happened but it would appear so.   
 
 
Am I the only one who has had the probe slip on U2 while trying to read the 
AGC Threshold Voltage?   

 
Frank W7is     


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