Sony FDR-AX40 How To Use Manual page 29

To turn off the power
Close the LCD monitor.
You can also turn off this product by pressing
If the viewfinder (models with the viewfinder) is pulled out, retract the viewfinder as shown
in the illustration below.
Turning this product on or off (models with the viewfinder)
The power of this product is turned on or off depending on the status of the LCD monitor or
the viewfinder.
LCD monitor: Open
Power On, regardless of the viewfinder status (retracted or pulled out)
LCD monitor: Closed
Power Off, when viewfinder is retracted
Power On, when viewfinder is pulled out
Note
Even if the LCD monitor is closed, if the viewfinder (models with the viewfinder) is pulled
out, this product is not turned off. When you turn off the power of this product, make sure
that the viewfinder (models with the viewfinder) is retracted to the original position.
[13] How to Use
Using this product supplying power from a wall outlet
(wall socket)
Getting started Power source preparations
(ON/STANDBY) button.