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You might also use the terminal mode to run the diagnostic to be sure that the encoder and all are working... That's all described in the assembly manual.

Also, when you power on, is it showing you version 14?

Paul -- AI7JR

Juan,

Maybe the issue is the earphone jack?? Can you try connecting a speaker to the board connections of the jack?? The other possibility is the audio amplifier has failed.? Do you have a way to connect an earphone to the output of either C420 or C421?

73
Evan
AC9TU

-- 
Paul -- AI7JR