Unloading a cassette manually
If the battery voltage drops below about 10.5 V, take out the cassette manually as illustrated below.
3
Cassette lid
1 Turn the power off.
2 Open this rubber cover. 
3 Pushing on the screw inside with a screwdriver, turn the screw counterclockwise until the cassette lid opens.
Unloading a cassette manually
You need not return the screw to its original position after taking out the cassette. Although the cassette lid is not locked, turning on the power makes the cassette lid operable again.
The following procedure prevents cassettes from being recorded inadvertently.
Push the plug in. To reuse the cassette, return the plug to its original position.
Preventing accidental erasure