[Elecraft] K1 KAT1 ATU produces constant '---' display

[Don Wilhelm]

Ron,

If you are certain of the soldering (check the connectors on the RF 
Board and the KFL1-4 board too), then yes, change either the MCU *or* 
the resonator in the KAT1.

If you have a 'scope, you can check the resonator to see if it is 
oscillating.

73,
Don W3FPR

Ron Hahn (EI2JP) wrote:
> Fellow Elecrafters,
>
> Having a problem with testing the KAT1 (Rev CR board) in a K1 (Rev E)
> radio.  The radio and 4-band filter board are fully tested but I cannot
> get past the '---' in the ATU menu for checkout.
>
> I've checked Vcc and Vdd on the micro-controller (Rev 1.30) and its
> 5.9v.  I've double checked all solder joints, removed and re-inserted
> the MCU and ensured that both connectors are seated properly as well. 
>
> This board is so simple.. have I a duff MCU or is there something else I
> can look for at this stage?
>
> Thanks for the help,
>
> Ron
>   
>