This is probably not a fix for your problem but this is how I setup my JENSEN radio...
My JENSEN radio of course is for a Automobile and uses two HOT connections... Main unit and what would go to the KEY ON position in the automobile...
My connections were both wired to the same 12VDC connection on my setup.
This means I have to set up everything every time I want to use it...
When we are at a location for an extended few days time it would be nice to turn off the radio and have it remember your previous settings... To make my setup more like what is in the automobile I installed a second switch using the ignition wire connection.
After I setup the radio using the main ON-OFF button I can now just use the side switch to turn ON-OFF the radio and it will remember my radio setting...
If I use the main OFF-OFF button the radio then all goes off including my presets...
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Roy Ken