Your “WALKMAN” cannot charge the battery.

The USB cable is not connected to a USB connector on your computer properly.

• Disconnect the USB cable, and then reconnect it.

• Use the supplied USB cable.

The battery is charged outside the temperature range of 5°C to 35°C.

• Charge the battery in a temperature range of 5°C to 35°C.

The computer is not on.

• Turn on the computer.

Your computer is in standby (sleep) or hibernation mode.

• Exit from standby (sleep) or hibernation mode.

An AC adapter not compatible with your “WALKMAN” is being used.

• Use an AC adapter (not supplied) compatible with your “WALKMAN” (AC-NWUM60, etc.).

A USB hub is being used.

• Your “WALKMAN” may not charge via a USB hub. Connect your “WALKMAN” directly to the computer’s USB port.

Your “WALKMAN” is connected to a computer running an operating system that is not supported.

• Check the system requirements of your computer, and charge with a computer running an operating system that is supported. [Details]

You have not used your “WALKMAN” for more than a year.

• Depending on the conditions under which your “WALKMAN” is used, the battery may be deteriorated. Consult your nearest Sony dealer.

If the problem still persists after performing the remedies above, press the RESET button to reset your “WALKMAN.” [Details]