Hans,
First of all, check to see if you have power to the KAT100 - you should
have 12 volts on both ends of RFC2.
If that is correct, check to be certain there is +5 volts at pin 2 of
U2, U3 and U4.
If all is well so far, suspect that either the MCU (U1) or U2, U3 and U4
have failed.
73,
Don
After two years of flawless function my combo-installation ( k2 + KAT100)
stopped working.
The friendly chatter of relays when pressing the tune button went silent, and
the line of small lamps on the front of the KAT100 went up all the way in RED.
while the display showed ( excessive power)Iswith
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