ESN (Key CD) security operating procedure18• This process cancels the protection for the ESNdeck.• If power to the CD3421 is disconnected, thenreconnected, a key CD will not need to be inserted inorder to return the unit to normal operation.• Inserting a CD other than the Key CD will not cancel theprotection. Instead, the display will show [ERR] for twoseconds, then the normal CD playback mode will activate.How to change the Key CD1 . First, cancel the existing Key CD.Refer to “How to cancel the Key CD.”2 . Next, program a new Key CD.Refer to “How to program the Key CD.”
