A Bluetooth connection cannot be established.
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The Bluetooth device to connect with is not turned on.
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Turn on the Bluetooth device, and make sure the Bluetooth function is activated.
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Registering (pairing) the Bluetooth device failed or was not completed.
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Your Walkman cannot connect with devices that are not registered (paired). Register (pair) the Bluetooth device(s). [Details]
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Your Walkman or the Bluetooth device to connect with is in sleep mode.
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Exit from sleep mode.
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The remaining battery power is low or depleted.
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Charge the battery by means such as connecting your Walkman to a running computer. [Details]
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The registration (pairing) information on your Walkman or the Bluetooth device to connect with has been deleted as a result of initializing settings, formatting memory, etc.
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Register (pair) your Walkman and the Bluetooth device to connect with again. [Details]
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The Bluetooth audio device profile does not support A2DP.
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Make sure the Bluetooth audio device profile supports A2DP.