[Elecraft] Have had to RESET MCU twice.

[Dr. J.R. Sheller]

I am not sure what is is happening with this unit.  My K2  [#4690]  is  
at the stage where I am adding the KI02.. Up to this point I have only 
had one "gremlin".. While going thru the filters last week, the radio 
locked up on 40M ..all other bands were OK,  but on 40 the freq was 
locked.  I posted here and was advised that I shoud do  a hard reset, 
which I did and which made every thing right again

 On Thursday, I finished the Ki02 and went thru the tests.. Would not 
communicate with the K2..after about 6 hrs of checking every joint etc. 
I discover that the L3  [100 uh rfc] was open.. I replaced ti and ..wow 
every thing worked..The K2 and the laptop talked like old friends..  
Today I was ready to do the permanent install of the KI02 in the K2.  I 
thought I should just recheck every thing, before I put it back 
together.. That wa s at 2PM today.  Again they wouldn't talk to each 
other  After cking soldering ..wiring .. and voltages for 3 hrs.. I 
found that the Voltage on PIN 1 of J2.wasnt there [ 5V].. Traced back to 
MCU on control board and found there was NO 5Von U6 [MCU PIN 25]..So I 
did a nother hard reset and all is well again.

Do I have a flaky MCU?.. A m I doing something flaky?   Could this 
continue to be a problem?


I need some input.. Let me kow what you think.   I dont think it is too 
good to be reseting the MCU all the time..

Doc K8RR.  

.