>       Replacement KREF3 card has been tried
>   

Did this include a new 49.38 MHz oscillator?  If that is bad, then there 
is no reference to which the synth can lock.  Do you have a receiver 
that covers 49.38 MHz, or 8.230 MHz?  Or an oscilloscope, freq counter 
or other means by which you can verify the 49.38 MHz oscillator is working?

73,

Lyle KK7P
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