Hi Feebal,
Thank you for your reply on this issue. Yesterday evening I took out the relevant fuse, but the radio didn't budge from its frozen state.
I took the car to the garage, the mechanic took out the unit and suggested that I take it to an AV repair shop. I reckon that they will be able to sort it out.
A friend told me today that given the proximity of radio to the heating / ventilation unit, the solder joints on the radio's PCB boards are subject to a lot heating and cooling, on top of the normal operation of the radio and tape machine itself. It seems a resonable theory....
I know what you mean about driving without any background music / chatter!!
Cheers for you interest on this,
smartbadge