Some of the SC901 have this problem where the radio stops playing by freezing on a radio station or a CD. By disconnecting the power to the radio and reconnecting it after a few moments the radio will work after entering the safety code. This fault will re occur after some days or even weeks. The fa...

The laser lens is dirty. A lens cleaner won't work. Rather use a clean earbud with cottonwool ends to clean the lens.