Sony NW-E393 How To Use Manual page 109

Help Guide
Depending on the way you use your Walkman, the Walkman may
become warm while the battery is being charged or the Walkman is
performing intensive data processing. This is not a malfunction.
[146] Troubleshooting
Message list
[System software update failed.] is displayed.
The update of the system software failed to be completed.
Follow the instructions displayed on your computer to retry updating the
system software.
[Check the volume level] is displayed.
An alarm (beep) and a warning [Check the volume level] are used to
protect your ears when you turn the volume up to a level that is harmful
to your ears for the first time. You can cancel the alarm and warning by
pressing any button.
You can turn up the volume after canceling the alarm and warning.
After the initial warning, the alarm and warning repeat for every 20
cumulative hours that the volume is set to a level that is harmful for
your ears. When this happens, the volume is turned down
automatically.
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