How to troubleshoot a malfunctioning radio in an Audi 80?

I am having trouble with my radio in my Audi 80. It is not turning on or producing any sound. How can I troubleshoot this issue?

First, check if the car battery is fully charged and the radio fuse is not blown. If both are in working condition, try resetting the radio by disconnecting the car battery for a few minutes and then reconnecting it. If the radio still does not work, it may be a malfunction in the radio itself.

Check if the antenna is properly connected and not damaged. If it is loose or damaged, it can affect the radio's functioning. Also, make sure there is no interference from other electronic devices in the car.