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

[Ron Hahn (EI2JP)]

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
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