I'll give you my best guess since I sold my JA3ES and am doing this from memory. Check your analog connector cables are good, be certain you have the input switch set to analog input.
Be certain you are not setting your inputs for the microphone jacks. If you are getting the error message din unlock the recorder is not getting the signal from the analog source.
It is possible to have damaged analog inputs on a used machine, but you have micorphone jacks and might get adaptor cables to hook your analog inputs in through the microphone jacks. Note this machine is old enough the microphones are 2 mono microphones left and right. If you want to use a modern stereo microphone you need an adaptor cable for that too.
If you try the above be careful as the mike jacks are really for mikes not what I mention, but it is a probable go around if your rear analog jacks are damaged for some reason.
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