The firmware in the EEPROM chip has been corrupted...
One of the most common failures of this unit is the error message "CDC SAFE"
There is a common software fault where the normally uncoded integrated CD Changer will decide to ask for a code, and as there is no method for CD code entry on this model, the Changer will simply lock up and display the error message of "CDC SAFE".
As a quick diagnosis, all Tuner and Cassette operations should function as normal. If the CD button is pressed with a CD inside, the error message of "CDC SAFE" will be displayed and if the eject button is pressed, the cartridge should eject without any problems.
A.R.S., December 2012