ESN (Key CD) security operating procedure
How to resume normal operation (ESN security lock out)
If power to the 54420 is disconnected while ESN security is active (a Key CD was programmed), operation is disabled until power is restored and the unit unlocked. Follow this procedure to resume normal operation.
1.When the power is turned on after disconnecting the battery power, a [SEC] message will appear for two seconds. Thereafter, the message changes to [DISC] and the 54420 is ready to accept your Key CD into the slot.
2.Insert your Key CD.
If the correct CD is inserted, an [OK] message will appear for two seconds and the CD will begin playing.
•If an incorrect CD is inserted, an [ERR] message will appear for two seconds, after which the CD will be ejected.
•You must use the same CD used for Key CD programming; a duplicate CD may not work properly.
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