Installed in a 1993 corvette by factory. has 5650 rf and rue 4175 remote. I just bought the car and the radio and cassette player work but not the cd changer. put in 6 discs and turned on the 5650 rf. remote will only show repeat and all when pressed. put in new battery and scan or other functions do not work. how does this work and what could be wrong. does radio need to be on, off or set to a special station, ect. thankyou . david brinsley p.s. no instruction book are there any on line?

The changer most likely is not going to be something you can fix. I know Chevrolet did not use the stereo you identified in that vehicle and if that is over 5 years old, as I suspect it is, it is due to be changed and has lasted longer than it's expected life expectancy already. I wish I could give you some good news but unless you have an oscilloscope, about $900, and experience in doing cd repairs with miniaturized circuits it would not be a good idea to open that up, too much can go wrong. Most likely the problem is going to be a bad chip or short transistor in one of the boards in that CD changer unit giving you the problems but without opening it up and testing every one in that circuit it will be very difficult to locate even on a good day. The changer most likely is not going to be something you can fix. I know Chevrolet did not use the stereo you identified in that vehicle and if that is over 5 years old, as I suspect it is, it is due to be changed and has lasted longer than it's expected life expectancy already. I wish I could give you some good news but unless you have an oscilloscope, about $900, and experience in doing cd repairs with miniaturized circuits it would not be a good idea to open that up, too much can go wrong. Most likely the problem is going to be a bad chip or short transistor in one of the boards in that CD changer unit giving you the problems but without opening it up and testing every one in that circuit it will be very difficult to locate even on a good day.