19ESN (Key CD) security operating procedureHow to resume normal operation(ESN security lock out)If power to the CD3421 is disconnected while ESN securityis active (a Key CD was programmed), operation is disableduntil power is restored and the unit unlocked. Follow thisprocedure to resume normal operation.1 . When the power is turned on afterdisconnecting the battery power, a [SEC]message will appear for two seconds.Thereafter, the message changes to [DISC]and the CD3421 is ready to accept your KeyCD into the slot.2 . Insert your Key CD.If the correct CD is inserted, an [OK] message willappear for two seconds and the CD will begin playing.• If an incorrect CD is inserted, an [ERR] message willappear for two seconds, after which the CD will beejected.• You must use the same CD used for Key CDprogramming; a duplicate CD may not work properly.
