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Power does not turn on / Power is turned off
Power does not turn on.
Check whether the power plug is correctly inserted into the power outlet. link
Power automatically turns off.
The sleep timer is set. Turn on the power again. link
“Auto Standby” is set. “Auto Standby” is triggered when there is no operation for a set amount of time. To disable “Auto Standby”, set “Auto Standby” on the menu to “Off”. link
The power to this unit does not turn off when you press the Power operation button. “ZONE2 On” or “ZONE3 On” appears on the display.
Power in either ZONE2 or ZONE3 is on. To turn off the power of the device (standby), press either the ZONE2 ON/OFF or ZONE3 ON/OFF button on the main unit or press the POWER 
button after pressing the Z2 or Z3 button on the remote control unit.