Denon DCD-720AE Service Manual page 39

(17) Turn on the unit, and press the "RESET" button.
①Turn on the unit.
(Check connection CN53 on CUP12202Z-1.)
(18) If the connection with the Flash Programmer is successfully made, a dialogue box saying "Erase All data in this
devise? (Y/N)" appears automatically. If the connection fails, error message will appear. (Ex.: E000)
Click Yes.
(19) Click A (Auto Programing) to start writing.
(20) Turn off the unit.
(21) Remove the SPK-581 from the unit.
CX709
39
PC
②Press the "RESET" button.