[Elecraft] No power out and no receive

[Ron D'Eau Claire]

Anything that disables the synthesizer will produce those symptoms. Check
the TMP cables that connect the KREF3 to the KSYN3 and to the K3 RF board to
make sure they are all properly seated. If your K3 has the newer KSYN3A
synthesizer board (mounted on the front panel shield with the KREF3) you
should see a green LED glowing brightly when you look down from the top
(it's on the back of the board near the top edge). If it's blinking the
synthesizer is NOT locked and will produce the symptoms you are
experiencing. Normally it will be glowing steadily. 

73, Ron AC7AC