Pascalywood said:
I understand that i have to remove some kind of chip on the radio? When I turn it on, instead of Ch XX being displayed its 4XX.XXX . none of the links mention my problem
That's not a "problem". The radio is in what they call the 'MHz mode'. If you download the AP73 manual, and actually read it, you will see how to get from 'MHz mode' to 'Memory mode'.
It's not a chip that needs to be removed, it's a jumper. The operator manual doesn't say how to do that. You will have to get the service manual. But before you do, try changing frequencies and storing it in memory. Again, the manual will show you how. If you can plug frequencies in while in MHz mode, the jumper is already out.
RTFM.