Try by first making sure that all the connection on the stereo are connected securely to the speakers. Second look to see if inside the stereo their are any loose or frayed wires. Make sure that the needle is in good working order and replace if the needle looks bent or worn.
That could depend on a few things from the disc that you are playing especially if they are non-copyrighted material. The main problem mostly is dust that has gotten inside of the player. Usually buying a cleaning disc and solution will take care of this.
If cds being used in the stereo are clean and scratch free, the problem is most likely the laser lens being dirty, scratched, or misaligned. To clean the lens, purchase a cheap lens cleaning disc that has small brushes to clean the lens. If cleaning does not fix the problem then Contact RCA to arrange repairs.
First of all you have to pin point the problem you are having with the Stero. Then they have excellent on line materials to help you out at www. rca. com