If the audio receiver does not function as expected, try the following steps to resolve the issue.

• Find the symptoms of the issue in this Help Guide, and try any corrective actions listed.
• Connect the audio receiver to a computer to charge the battery.
  You may be able to resolve some issues by charging the battery.
• Reset the audio receiver.
• Initialize the audio receiver.
  This operation resets volume settings, etc., and deletes all pairing information.
• Look up information on the issue on the customer support website.

If the operations above do not work, consult your nearest Sony dealer.